KR102662639B1 - X-ray image apparatus nad control method for the same - Google Patents

Abstract

An X-ray imaging device and a control method for setting various parameters related to X-ray imaging, including an X-ray irradiation area, using camera images and automatically controlling X-ray imaging, are provided.
An X-ray imaging device according to an embodiment includes a photographing unit that captures a camera image; An X-ray source equipped with a collimator that adjusts the X-ray irradiation area; a storage unit that maps and stores X-ray imaging areas for each X-ray imaging protocol; an input unit that receives a selection for the X-ray imaging protocol; and a control unit that extracts an X-ray imaging area mapped to the selected X-ray imaging protocol from the camera image and controls the collimator so that the X-ray radiation area corresponds to the extracted X-ray imaging area.

Description

X-ray imaging device and control method thereof {X-RAY IMAGE APPARATUS NAD CONTROL METHOD FOR THE SAME}

It relates to an X-ray imaging device and a control method thereof.

An X-ray imaging device is a device that radiates X-rays to an object and analyzes the X-rays that pass through the object to determine the internal structure of the object. Since the penetrability of X-rays varies depending on the tissues that make up the object, the internal structure of the object can be imaged using the attenuation coefficient that quantifies this.

The X-ray irradiation area can be adjusted by a collimator. In order to prevent the object from being unnecessarily exposed to X-rays or being irradiated with X-rays, it is important to accurately set the X-ray irradiation area in consideration of the need.

There may be cases where it is not possible to image all desired areas in one shot due to various reasons, such as when the X-ray irradiation area is narrower than the imaging area or when the X-ray detection area is narrower than the imaging area.

In this case, one X-ray image for the desired region can be obtained by dividing the imaging area into a plurality of regions and stitching the plurality of X-ray images obtained by performing X-ray imaging for each region.
(Patent Document 1) US 20090086885 A1

An X-ray imaging device and a control method for setting various parameters related to X-ray imaging, including an X-ray irradiation area, using camera images and automatically controlling X-ray imaging, are provided.

An X-ray imaging device according to an embodiment includes a photographing unit that captures a camera image; An X-ray source equipped with a collimator that adjusts the X-ray irradiation area; a storage unit that maps and stores X-ray imaging areas for each X-ray imaging protocol; an input unit that receives a selection for the X-ray imaging protocol; and a control unit that extracts an X-ray imaging area mapped to the selected X-ray imaging protocol from the camera image and controls the collimator so that the X-ray radiation area corresponds to the extracted X-ray imaging area.

The input unit may receive a selection from the user regarding an X-ray imaging area to be mapped for each X-ray imaging protocol.

It may further include a display unit that displays a graphic object having the shape of an object to receive a selection regarding the X-ray imaging area, and displays an imaging area window designating the X-ray imaging area over the graphic object. .

When at least one of the position and size of the imaging area window is adjusted through the input unit, the control unit may store an area corresponding to at least one of the adjusted position and size of the imaging area window in the storage unit as the X-ray imaging area. there is.

It may further include a display unit that displays the camera image and displays the extracted X-ray imaging area by overlapping it on the camera image.

The display unit may display a protocol list for receiving a selection input for the X-ray imaging protocol, and may display the camera image when a command to display the camera image is input through the input unit.

The input unit may receive settings for X-ray irradiation conditions for each X-ray imaging protocol, and the storage unit may map and store the set X-ray irradiation conditions for each X-ray imaging protocol.

When an X-ray imaging protocol is selected, the control unit may perform X-ray imaging by applying X-ray irradiation conditions mapped to the selected X-ray imaging protocol.

An X-ray imaging device according to another embodiment includes a display unit that displays a graphic user interface for receiving settings for X-ray irradiation conditions for each size of an object; a storage unit that maps and stores the X-ray irradiation conditions for each size of the object according to the input; A filming unit that takes camera images; and a control unit that recognizes the size of the object shown in the camera image and performs X-ray imaging by applying X-ray irradiation conditions mapped to the size of the recognized object.

The display unit may display the size of the recognized object.

The storage unit may map and store the X-ray irradiation conditions according to the size of the object and the X-ray imaging protocol.

When an X-ray imaging protocol is selected, the control unit may perform X-ray imaging by applying an X-ray irradiation condition mapped to the selected X-ray imaging protocol and the size of the recognized object.

An X-ray imaging device according to another embodiment includes an X-ray source equipped with a photographing unit that captures a camera image and a light source that irradiates visible light to an X-ray irradiation area; Calculate the position of the X-ray irradiation area in the camera image based on the coordinate information of the a control unit that calculates a position in the image and determines that calibration is necessary if the position of the X-ray irradiation area and the position of the light irradiation area do not match; and a display unit that displays information related to the calibration when the calibration is necessary.

The display unit may display a first X-ray irradiation area window corresponding to the calculated position of the X-ray irradiation area, and display a second X-ray irradiation area window corresponding to the calculated position of the light irradiation area.

The control unit may determine that the calibration is necessary if at least one of the positions, shapes, and sizes of the first X-ray irradiation area window and the second X-ray irradiation area window do not match each other.

When the calibration is necessary, the control unit may calculate a calibration parameter based on the difference between the first X-ray irradiation area window and the second X-ray irradiation area window.

The display unit may display the calculated calibration parameters.

The control unit may automatically perform the calibration based on the calculated calibration parameters.

The control unit extracts a detector boundary line by extracting a boundary of the X-ray detector shown in the camera image or a mounting portion on which the It may be determined whether the X-ray detector and the X-ray source are aligned based on the area window and the extracted detector boundary line.

The control unit may determine that the X-ray detector and the

The control unit may determine that the X-ray detector and the X-ray source are aligned when the center of the X-ray irradiation area window coincides with the center of the detector boundary line.

The display unit may display the detector boundary line and the X-ray irradiation area window by overlapping them on the camera image.

The control unit may calculate a movement distance or direction of movement of the X-ray source or X-ray detector to align the X-ray source and the X-ray detector.

The control unit may move the X-ray source or the X-ray detector based on the calculated movement distance or direction.

The display may display the calculated movement distance or direction of movement.

The display unit further includes an input unit that displays an X-ray irradiation area window at the calculated X-ray irradiation area or a position of the calculated light irradiation area, and receives a command to adjust the position or size of the can do.

When the X-ray irradiation area window deviates from the boundary line of the X-ray detector shown in the camera image or the mounting portion on which the X-ray detector is mounted due to the input adjustment command, the display unit may display the area outside the boundary line.

An X-ray imaging device that generates one X-ray image by stitching a plurality of X-ray images for a plurality of divided areas according to another embodiment includes an ; a display unit that overlaps and displays a plurality of divided area windows indicating sizes and positions of the plurality of divided areas on the camera image; and a control unit that controls the collimator to adjust the width of the X-ray irradiation area for at least one of the plurality of divided areas.

It may further include an input unit that receives a command for controlling the width of the X-ray irradiation area, and the control unit may control the collimator according to the input command.

The control unit may control the collimator so that the width of the X-ray radiation area corresponds to the width of the object shown in the camera image.

The control unit may extract the outline of the object from the camera image and determine the width of the X-ray radiation area based on the boundary between the extracted outline and the background.

It may further include a plurality of AEC sensors that control the amount of X-rays emitted from the X-ray source, and the controller may select at least one of the plurality of AEC sensors based on the adjusted width of the X-ray irradiation area.

An X-ray imaging device according to another embodiment includes a photographing unit that generates one X-ray image by stitching a plurality of X-ray images for a plurality of divided areas and captures a camera image; A display unit that displays the camera image; and a control unit that determines, based on the camera image, whether an overlap area where the plurality of divided areas overlap is located in a preset area.

The control unit may move the overlap area so that the overlap area is not located in the preset area.

The display unit may display the overlap area over the camera image and output a warning to the user when the overlap area is located in the preset area.

It may further include an input unit that receives a user's command to move the overlap area.

A control method of an X-ray imaging device according to an embodiment includes mapping and storing an X-ray imaging area for each X-ray imaging protocol; receiving a selection for the X-ray imaging protocol; extracting an X-ray imaging area mapped to the selected X-ray imaging protocol from the camera image; It may include controlling a collimator so that the X-ray irradiation area corresponds to the extracted X-ray imaging area.

Mapping and storing the X-ray imaging area includes receiving input from the user to select an X-ray imaging area to be mapped for each X-ray imaging protocol; It may include mapping and storing the X-ray imaging area for each X-ray imaging protocol according to the input.

A method of controlling an X-ray imaging device according to another embodiment includes displaying a graphical user interface for receiving settings for X-ray irradiation conditions for each size of an object; mapping and storing the X-ray irradiation conditions for each size of the object according to the input; capture camera footage; Recognize the size of the object shown in the camera image; and a control unit that performs X-ray imaging by applying X-ray irradiation conditions mapped to the size of the recognized object.

It may further include displaying the size of the recognized object.

A method of controlling an X-ray imaging device according to another embodiment includes irradiating visible light to an X-ray irradiation area; capture camera footage; Calculate the location of the X-ray radiation area in the camera image based on coordinate information of the X-ray source; extracting a light irradiation area irradiated with visible light displayed in the camera image, and calculating a position of the extracted light irradiation area in the camera image; If the position of the X-ray irradiation area does not match the position of the light irradiation area, it is determined that calibration is necessary, and information related to the calibration is displayed.

extracting a detector boundary line by extracting a boundary of the X-ray detector shown in the camera image or a mounting portion on which the X-ray detector is mounted; The method may further include determining whether the X-ray detector and the X-ray source are aligned based on the calculated X-ray irradiation area or an there is.

displaying an X-ray irradiation area window at the calculated X-ray irradiation area or at a position of the calculated light irradiation area; It may further include receiving a command to adjust the position or size of the X-ray radiation area window from the user.

The method may further include, when the X-ray irradiation area window deviates from a boundary line of the X-ray detector shown in the camera image or a mounting portion on which the X-ray detector is mounted due to the input adjustment command, displaying an area outside the boundary line.

A method of controlling an X-ray imaging device according to another embodiment includes capturing a camera image; Overlapping and displaying a plurality of divided area windows indicating the size and position of the plurality of divided areas on the camera image; It may include controlling the collimator to adjust the width of the X-ray irradiation area for at least one of the plurality of divided areas.

The method may further include receiving a command for controlling the width of the X-ray irradiation area, and controlling the collimator may include controlling the collimator according to the input command.

Controlling the collimator may include controlling the collimator so that the width of the X-ray radiation area corresponds to the width of the object shown in the camera image.

The method may further include selecting at least one of a plurality of AEC sensors for each of the plurality of divided regions based on the width of the adjusted X-ray irradiation area.

A method of controlling an X-ray imaging device according to another embodiment includes capturing a camera image; displaying the camera image; and overlapping and displaying a plurality of segmented areas where stitching photography will be performed on the camera image. and determining whether an overlap area where the plurality of divided areas overlap is located in a preset area.

The method may further include moving the overlap area when the overlap area is located in the preset area.

According to an X-ray imaging device and a control method thereof according to an aspect, various parameters related to X-ray imaging, including an X-ray irradiation area, can be set using a camera image and X-ray imaging can be automatically controlled.

1 is a control block diagram of an X-ray imaging device according to an embodiment.
FIG. 2A is an external view showing the configuration of an X-ray imaging device according to an embodiment.
Figure 2b is an external view showing a sub-display device mounted on an X-ray source.
Figure 3a is a diagram showing the configuration of a collimator.
Figure 3b is a side cross-sectional view of the blade cut along the AA' cross-section.
Figure 4 is a view of the X-ray source seen from the front.
5A and 5B are diagrams showing examples of AEC sensors that can be used in an X-ray imaging device according to an embodiment.
Figures 6 and 7 are diagrams showing examples of screens displayed on the display unit of an X-ray imaging device according to an embodiment.
FIG. 8A is a diagram conceptually showing that light representing an X-ray irradiation area is irradiated from an X-ray source.
FIG. 8B is a diagram illustrating an example in which a light irradiation area is included in a camera image displayed on a display unit.
Figure 9 is a diagram showing an example of displaying an X-ray irradiation area window based on the light irradiation area.
Figure 10 is a diagram showing an X-ray irradiation area window created using coordinate information and an X-ray irradiation area window created through image processing.
11 to 15 are diagrams illustrating a method of aligning an X-ray source and an X-ray detector of an X-ray imaging device according to an embodiment.
FIG. 16 illustrates an example in which the X-ray irradiation area window displayed on the display unit of the X-ray imaging device deviates from the boundary of the X-ray detector, according to an embodiment.
Figures 17 to 19 are diagrams showing examples of pre-setting a shooting area according to a shooting protocol.
Figure 20 is a diagram showing information stored in the storage unit.
Figure 21 is a diagram showing the process of extracting a shooting area corresponding to a shooting protocol from a camera image.
Figure 22 is a diagram showing a camera image showing the extracted shooting area.
Figure 23 is a diagram showing an operation of pre-setting information about the size of an object.
Figure 24 is a diagram showing information about the size of an object that is stored in advance.
Figure 25 is a diagram showing a screen on which X-ray irradiation conditions can be set for each object size.
Figure 26 is a diagram showing an operation of automatically determining the size of an object based on a camera image.
Figure 27 is a diagram showing an example of a stitched image.
Figure 28 is a diagram showing an example in which a shooting area is divided to perform stitching shooting.
Figure 29 is a diagram showing the overlap area between each divided area.
Figures 30 and 31 are diagrams showing the operation of automatically adjusting the overlap area.
Figures 32 and 33 are diagrams for a case where a user directly designates a stitching area.
FIGS. 34A to 36 are diagrams illustrating a screen that allows a user to set the width of the X-ray irradiation area for each divided area in an X-ray imaging device according to an embodiment.
Figures 37 and 38 are diagrams showing a screen that allows a user to select an AEC sensor in an imaging device according to an embodiment.
Figures 39A to 39C are diagrams for performing stitching imaging by controlling the tilt angle of the X-ray source in the X-ray imaging device according to an embodiment.
Figure 40 is a diagram showing the operation of determining the movement of an object using a camera image.
Figures 41 and 42 are diagrams illustrating control when re-photography is performed after stitching photography is stopped while some segment photography is not completed.
Figure 43 is a flowchart showing an example of a method for verifying an X-ray irradiation area in a method for controlling an X-ray imaging device according to an embodiment.
Figure 44 is a flowchart showing an example of a method for aligning an X-ray source and an X-ray detector in a method for controlling an X-ray device according to an embodiment.
Figure 45 is a flowchart of a method for setting an imaging protocol in a method for controlling an X-ray imaging device according to an embodiment.
Figure 46 is a flowchart of a method for determining whether to stop segmented imaging according to movement of an object in a method for controlling an X-ray imaging device according to an embodiment.
Figure 47 is a flowchart for a case of resuming stitching imaging in a method for controlling an X-ray imaging device according to an embodiment.
Figure 48 is a flowchart of a method of controlling an overlap area in a method of controlling an X-ray imaging device according to an embodiment.
Figure 49 is a flowchart of a method of presetting the size of an object in a method of controlling an X-ray imaging device according to an embodiment.

Hereinafter, embodiments of an X-ray imaging device and a control method thereof according to one aspect will be described in detail with reference to the attached drawings.

FIG. 1 is a control block diagram of an X-ray imaging device according to an embodiment, FIG. 2A is an exterior view showing the configuration of an It is also a degree. The exterior shown in FIG. 2A is an example of an X-ray imaging device and relates to a ceiling type X-ray imaging device in which an X-ray source is connected to the ceiling of an examination room.

Referring to FIG. 1, the X-ray imaging device 100 according to one embodiment includes an ), a display unit 150 that displays images captured by , a screen for setting X-ray irradiation conditions, etc., a command for setting the object size, a command for setting a shooting protocol, a command for setting An input unit 160 that receives control commands from the user, a storage unit 170 that stores information on object size, imaging protocol, and 140).

Additionally, the X-ray imaging device 100 may further include a communication unit 130 that communicates with an external device.

The control unit 140 can control the X-ray irradiation timing and X-ray irradiation conditions of the there is.

Additionally, the control unit 140 may control the position or posture of the mounting units 14 and 24 on which the X-ray source 110 or the X-ray detector 200 is mounted according to the imaging protocol and the location of the object P.

The control unit 140 may include a memory storing a program that performs the above-described operation and the later-described operation, and a processor executing the stored program. The control unit 140 may include a single processor or a plurality of processors. In the latter case, the plurality of processors may be integrated on one chip or may be physically separated.

When the control unit 140 includes a plurality of processors and a plurality of memories, some of these memories and processors are installed in the work station 180, and other parts are installed in the sub-user interface 80 (see FIG. 2A) or the moving carriage 40. , see Figure 2a), it is also possible to be provided in other devices. For example, the processor provided in the workstation 180 performs control such as image processing to generate medical images, and the processor provided in the sub-display device or moving carriage operates the X-ray source 110 or the X-ray detector 200. Control related to movement can be performed.

The X-ray imaging device 100 communicates with external devices (e.g., external servers 310, medical devices 320, and portable terminals 330; smartphones, tablet PCs, wearable devices, etc.) through the communication unit 130. It can be connected to transmit or receive data.

The communication unit 130 may include one or more components that enable communication with an external device, and may include, for example, at least one of a short-range communication module, a wired communication module, and a wireless communication module. Additionally, the communication unit 130 may further include an internal communication module that enables communication between components of the X-ray imaging device 100.

In addition, the communication unit 130 receives a control signal from an external device and transmits the received control signal to the control unit 140, allowing the control unit 140 to control the X-ray imaging device 100 according to the received control signal. It is also possible.

Additionally, the control unit 140 can transmit a control signal to an external device through the communication unit 130, thereby controlling the external device according to the control signal of the control unit 140. For example, the external device may process data from the external device according to a control signal from the control unit 140 received through the communication unit 130. A program capable of controlling the X-ray imaging device 100 may be installed in the external device, and this program may include commands that perform some or all of the operations of the control unit 140.

The program may be pre-installed on the portable terminal 330, or the user of the portable terminal 330 may download and install the program from a server that provides the application. A server that provides an application may include a recording medium on which the program is stored.

Referring to FIG. 2A, a guide rail 30 may be installed on the ceiling of an examination room where the X-ray imaging device 100 is placed, and an By connecting, the X-ray source 110 can be moved to a position corresponding to the object P, and the moving carriage 40 and the X-ray source 110 are connected through a foldable post frame 50 to The height can be adjusted.

The X-ray source 110 can move automatically or manually. When it moves automatically, the X-ray imaging device 100 may further include a driving unit such as a motor that provides power to move the X-ray source 110. .

A workstation 180 may be provided in a space where the X-ray source 110 is located and a space separated by a shielding film (B). The workstation 180 may be provided with an input unit 181 that receives user commands and a display unit 182 that displays information.

The input unit 181 may receive commands for imaging protocol, X-ray irradiation conditions, X-ray irradiation timing, and position control of the X-ray source 110. The input unit 181 may include a keyboard, mouse, touch screen, voice recognizer, etc.

The display unit 182 may display a screen for guiding user input, an X-ray image, and a screen indicating the status of the X-ray imaging device 100.

Meanwhile, the display unit 150 and input unit 160 described in FIG. 1 may be implemented as a display unit 181 and an input unit 182 provided in the work station 180, and a sub display provided in the sub display device 80. It may be implemented as a unit 81 and a sub-input unit 82, and may also be implemented as a display unit and an input unit provided in a mobile device such as a tablet PC or smartphone.

The X-ray detector 200 may be implemented as a fixed It can also be implemented as a portable x-ray detector. Portable X-ray detectors can be implemented as a wired or wireless type depending on the data transmission method and power supply method.

The X-ray detector 200 can also be moved automatically or manually. When it moves automatically, the X-ray imaging device 100 may further include a driving part such as a motor that provides power to move the mounting parts 14 and 24. there is.

The X-ray detector 200 may or may not be included as a component of the X-ray imaging device 100. In the latter case, the X-ray detector 200 may be registered with the X-ray imaging device 100 by the user. Additionally, in both cases, the X-ray detector 200 is connected to the control unit 140 through the communication unit 130 and can receive control signals or transmit image data.

A sub display device 80 may be provided on one side of the X-ray source 110 to provide information to the user and receive commands from the user, and the input unit 181 and the display unit 182 of the work station 180 may be provided. Some or all of the functions may be performed in the sub-display device 80.

If all or part of the components of the control unit 140 and the communication unit 130 are provided separately from the workstation 180, they may be included in the sub-display device 80 provided in the X-ray source 110.

The user can input various information or commands related to X-ray imaging by manipulating the sub-input unit 82 or touching the sub-display unit 81 as shown in FIG. 2B.

For example, the user may input the moving position of the X-ray source 110 through the sub input unit 82 or the sub display unit 81.

Although FIG. 2A shows a fixed X-ray imaging device connected to the ceiling of an examination room, the may include an X-ray imaging device.

Meanwhile, the X-ray source 110 may include an X-ray tube that generates X-rays, a collimator that adjusts the irradiation area of the X-rays generated from the Hereinafter, it will be described in detail with reference to the drawings.

Figure 3a is a diagram showing the configuration of the collimator, and Figure 3b is a side cross-sectional view of the blade taken along the AA' cross-section.

Referring to FIG. 3A, the collimator 113 includes at least one movable blade (113a, 113b, 113c, and 113d), and the blade is made of a material with a high bandgap and can absorb X-rays. The X-ray irradiation range can be adjusted as the blade moves, and the collimator 113 may further include a motor that provides power to each blade.

The control unit 140 calculates the movement amount of each blade corresponding to the set irradiation area and transmits a control signal to the collimator 113 to move the blade by the calculated movement amount.

As an example, the collimator 113 may include four blades 113a, 113b, 113c, and 113d having a square shape. The first blade 113a and the third blade 113c can move in both directions along the x-axis, and the second blade 113b and the fourth blade 113d can move in both directions along the y-axis.

In addition, it is possible for the four blades (113a, 113b, 113c, and 113d) to move individually, and the first blade (113a) and the third blade (113c) are one set, and the second blade (113b) and the fourth blade are one set. It is also possible for the blades 113d to move as a set.

X-rays are irradiated through slots (R) formed by four blades, and collimation can be performed by passing the X-rays through the slots (R). Therefore, in this embodiment, the slot R is referred to as a collimation area, and the X-ray irradiation area is the area where the Do what it means.

Referring to FIG. 3B, the collimator 113 is placed in front of the X-ray tube 111. Here, the front of the X-ray tube 111 refers to the direction in which X-rays are irradiated. The irradiation area E of the X-rays irradiated from the focus 2 of the X-ray tube 111 is limited by the collimator 113, and scattering is reduced.

Among the X-rays irradiated from the Here, the explanation is made assuming the case where there is no object.

When X-rays spread in the form of a conebeam, the X-ray irradiation area (E) is wider than the collimation area (R). The control unit 140 can irradiate X-rays to the X-ray irradiation area E in a desired range by adjusting the collimation area R based on the relationship between the two areas.

In the above example, the collimator 113 is described as having four square blades, but this is only an example that can be applied to the X-ray imaging device 100, and the number or shape of the blades included in the collimator 113 does not vary. There are no restrictions on

Figure 4 is a view of the X-ray source seen from the front.

Referring to FIG. 4, a collimator 113 may be placed in front of the X-ray source 110, and an imaging unit 120 may be built in an area adjacent to the collimator 113.

The photographing unit 120 is implemented with a camera such as a CCD camera or a CMOS camera and can capture video. Alternatively, it is also possible to shoot still images at short intervals.

While the X-ray source 110 captures an X-ray image of the object, the imaging unit 120 captures a live image of the object. In an embodiment described later, the image captured by the X-ray source 110 will be referred to as an X-ray image, and the image captured by the imaging unit 120 will be referred to as a camera image. The camera image may or may not include the object. That is, the camera image may be captured with the object 1 located in front of the X-ray detector 200, or may be captured without the object 1 present.

The imaging unit 120 may be placed at a location where the X-ray imaging area of the object can be photographed. For example, the X-ray source 110 may be mounted in the same direction as the direction in which X-rays are irradiated. When the imaging unit 120 is mounted on the X-ray source 110, the offset between the area shown in the It can become easier. The mounting position of the imaging unit 120 can be appropriately determined within a range that minimizes the offset between the area shown in the X-ray image and the area shown in the camera image, but does not affect the X-ray imaging.

A housing 110a may be formed on the front of the collimator 113. The housing 110a is made of a material such as transparent resin or glass to minimize the effect on the X-rays irradiated from the X-ray tube 111.

Additionally, a cross-shaped guide line GL may be displayed on the housing formed on the front of the collimator 113. When the collimator lamp built in the X-ray source 110 radiates visible light to the You can intuitively determine the location of the X-ray irradiation area (E) by looking at the shadow of (GL).

The photographing unit 120 may be mounted inside the housing 110a as shown in FIG. 4 . Alternatively, it may be mounted on the outside of the housing 110a, and in this case, it may be mounted on a bezel provided around the housing 110a. However, the exemplary embodiment of the

Additionally, the photographing unit 120 can also be implemented as a stereo camera. In this case, cameras may be provided on both left and right sides in front of the X-ray source 110. If the photographing unit 120 is implemented as a stereo camera, depth information of the camera image can also be obtained, and depth information can be used to improve the accuracy of image recognition and the reliability of various information calculated based on the camera image.

5A and 5B are diagrams showing examples of AEC sensors that can be used in an X-ray imaging device according to an embodiment.

The X-ray imaging apparatus 100 may perform automatic exposure control (AEC) to prevent excessive radiation exposure of the object. To this end, as shown in FIG. 5A, an AEC sensor module 26 that detects the dose of X-rays may be provided within the mounting unit 24. In this example, the explanation is made using the mounting part 24 of the stand 20, but of course, the AEC sensor module can also be provided in the mounting part 14 of the table 10.

Figure 5a is a view of the mounting portion 24 viewed from the front. The AEC sensor module 26 may be provided inside the mounting unit 24 and may be composed of a plurality of AEC sensors 26a, 26b, and 26c that independently detect the dose of X-rays. As an example, each AEC sensor may be implemented as an ionization chamber.

The most accurate automatic exposure control is possible when the AEC sensor is located in the center of the X-ray image area. In order to position the center of the X-ray imaging area at a position corresponding to the AEC sensor or to select an AEC sensor located at the center of the X-ray imaging area, a plurality of AEC sensors 26a, 26b, and 26c are installed on the surface of the mounting unit 24 Markers (Ma, Mb, Mc) indicating the location may be provided.

In Figure 5a, a total of three AEC sensors are provided, two at the top and one at the bottom, but this is only an example, and it is also possible to have fewer or more AEC sensors than three. , the placement of AEC sensors may also be implemented differently.

Referring to FIG. 5B, the AEC sensor module 26 may be located in front of the X-ray detector 200. The front of the X-ray detector 200 refers to the direction in which X-rays are incident. FIG. 5B is a side view of the AEC sensor module 26 disposed in front of the X-ray detector 200.

When X-rays are incident on the AEC sensor, a current is generated, and the AEC sensor can transmit a signal corresponding to the generated current to the control unit 140. The signal transmitted to the control unit 140 may be an amplified and digitized signal.

Based on the transmitted signal, the control unit 140 determines whether the currently incident X-ray dose exceeds the threshold dose. If the X-ray dose exceeds the critical dose, the generation of X-rays can be stopped by transmitting a cut-off signal to the high voltage generator 101 that supplies high voltage to the X-ray tube 111.

Meanwhile, it is possible to place a grid on the front of the AEC sensor module 26 to prevent scattering of X-rays. Some of the X-rays irradiated from the When these scattered X-rays are incident on the X-ray detector 200, they have a negative impact on the quality of the X-ray image, such as lowering the contrast of the X-ray image.

The grid has a structure in which a shielding material such as lead (Pb) that absorbs X-rays is arranged, and among the irradiated X-rays, the X-rays traveling in the original direction, that is, the Then, the scattered X-rays hit the shielding material and are absorbed.

The shielding material may be arranged linearly or in a grid (cross) structure. Additionally, the shielding material may be arranged in a focused manner at an angle similar to the X-ray irradiation direction, or may be arranged in parallel.

Although not shown in the drawing, a driving unit including a motor that can mechanically move the grid may be provided inside the mounting unit 24. Therefore, it is possible to adjust the angle or center position of the grid by transmitting a control signal to the driver from the outside.

Meanwhile, in this example, the AEC sensor module 26 is described as being provided in the mounting unit 24, but it is also possible for the AEC sensor module 26 to be provided integrally with the X-ray detector 200.

Figures 6 and 7 are diagrams showing examples of screens displayed on the display unit of an X-ray imaging device according to an embodiment.

As shown in FIG. 6, a setting window 151 and a worklist 155 for setting X-ray irradiation conditions may be displayed on the screen 150a of the display unit 150.

The worklist 155 may include a study list 155a from which a study can be selected and a protocol list 155b from which an imaging protocol can be selected. A study may refer to a set of X-ray images related to each other. When one study is selected from the study list 155a, a protocol list 155b is displayed from which the imaging protocol to be applied to the selected study can be selected.

The X-ray imaging area varies for each imaging protocol, and appropriate X-ray irradiation conditions may vary for each X-ray imaging area. The imaging protocol may be determined depending on the X-ray imaging area, the posture of the object, etc., and may include, for example, full body AP (Anterior Psterior), full body PA (Psterior Anterior), and full body LAT, and chest There may also be an imaging protocol for imaging using the AP, PA, and LAT methods, and for long bones such as legs, there may also be an imaging protocol for imaging using the AP, PA, and LAT methods. Additionally, standing abdominal imaging (Abdomen Erect) may also be included in the imaging protocol.

The settings window 151 may display a graphical user interface (GUI) through which X-ray irradiation conditions can be set. The graphical user interface may include a plurality of graphic objects that can set various X-ray irradiation conditions. In this embodiment, all objects such as buttons and icons displayed on the display unit 150 and used to provide information or receive control commands from the user may be referred to as graphic objects.

Since the graphic objects displayed in the settings window 151 are used to receive a command to set X-ray irradiation conditions from the user, they can be implemented as buttons corresponding to each X-ray irradiation condition.

For example, the tube voltage setting button 151a for receiving the tube voltage setting, the tube current setting button 151b for receiving the tube current setting, and the exposure time setting button 151c for receiving the X-ray exposure time setting are displayed. It can be. The user can select each button to set the X-ray irradiation conditions to a desired value. Selection of a button may be made by clicking or touching depending on the type of input unit 160.

Depending on the embodiment, the tube voltage setting button 151a may individually include a button for increasing the tube voltage or a button for decreasing the tube voltage, and the tube current setting button 151b may include a button for increasing the tube current or a button for decreasing the tube current. Each button may be individually included, and the exposure time setting button 151c may individually include a button for increasing the exposure time or a button for shortening the exposure time.

In addition, an imaging position setting button 151d for receiving settings regarding whether to perform X-ray imaging on the stand 20 or the table 10, and a patient size selection button for receiving a selection regarding the patient size. (151e), collimator setting button (151f) to receive settings for collimator (113) size, AEC selection button (151g) to receive settings for AEC sensor, and receive settings for sensitivity. sensitivity setting button (151h), button (151i) for receiving density settings, grid selection button (151j) for receiving grid selection, filter selection button for receiving filter selection. (151k), a focus selection button (151r) for receiving a selection for the focus size, etc. may be further displayed.

These buttons can be implemented as shapes made up of pictures, letters, symbols, etc., and the user can select one shape by moving the cursor to the relevant shape and clicking on it, or by touching the shape and manipulating the shape accordingly. You can change the corresponding settings.

Meanwhile, when a selection for a patient size is input, X-ray irradiation conditions mapped as default to the corresponding size may be set. To this end, the storage unit 170 may store a database in which X-ray irradiation conditions for each patient size are mapped.

When the user selects a patient size, X-ray irradiation conditions such as tube voltage, tube current, and exposure time mapped to the corresponding size by default are displayed in the settings window 151. The mapped X-ray irradiation conditions can be applied as is, or the user can select a button corresponding to each X-ray irradiation condition and reset it according to the above-described method. At this time, the user can reset it by referring to the default X-ray irradiation conditions displayed in the settings window 151.

Additionally, the X-ray imaging area varies for each imaging protocol, and appropriate X-ray irradiation conditions may vary for each X-ray imaging area. Accordingly, X-ray irradiation conditions may be set differently depending on the imaging protocol selected in the worklist 155 and the object size selected in the settings window 151.

The types and arrangements of graphic objects displayed in the settings window 151 described above are all exemplary, and some of them may be omitted depending on the designer's selection, and additional graphic objects for changing other settings may be provided. Of course, it is also possible to have a different arrangement than the above-described example.

When the setting of the X-ray irradiation conditions is completed, the user can select the photographing button 151l to perform X-ray imaging, and when the user wishes to initialize the settings, the user can select the reset button 151m.

Meanwhile, in order to obtain information necessary for performing X-ray imaging, the imaging unit 120 may capture a camera image with the X-ray source 110 facing the X-ray detector 200. In this case, the X-ray detector 200 or the mounting units 14 and 24 on which the X-ray detector 200 is mounted may be obscured by the object 1 and may not appear in the camera image. Conversely, when the camera image is captured while the object 1 is not located in front of the X-ray detector 200, the X-ray detector 200 or the mounting units 14 and 24 equipped with the It may appear. The captured camera image 152 may be displayed on one side of the settings window 151, as shown in FIG. 7.

The worklist 155 shown in FIG. 6 and the camera image 152 shown in FIG. 7 may be switched to each other. When the camera image button (I) is selected while the worklist 155 is displayed, the worklist 152 is converted to the camera image 152, and the close button 152b is selected while the camera image 152 is displayed. When this happens, the camera image 152 can be converted to the worklist 155. Alternatively, if the selected shooting protocol requires stitching shooting, the screen is automatically converted to the camera image 152 and screens related to stitching shooting, which will be described later, may be displayed.

Referring to FIG. 7 , the X-ray irradiation area window B1 may be displayed overlapping on the X-ray detector 200 or the mounting unit 24 shown in the camera image 152. In this example, the X-ray detector 200 is mounted within the mounting unit 24, and the mounting unit 24 is displayed in the camera image.

The X-ray irradiation area window B1 is a tool that indicates the area where X-rays irradiated from the X-ray source 110 reach the X-ray detector 200, that is, the X-ray irradiation area E. The control unit 140 calculates the X-ray irradiation area (E) according to an algorithm described later, and provides the user with information about the size and location of the calculated An X-ray irradiation area window B1 indicating the size and location of may be displayed on the camera image 152. Here, the size and position of the X-ray irradiation area window B1 are relative to the mounting portion 24 shown in the camera image 152.

The user can adjust the position, size, or shape of the X-ray radiation area window B1 displayed on the display unit 150 by inputting a predetermined operation command through the input unit 160, and the control unit 140 controls the input operation command. The X-ray irradiation area E can be adjusted by controlling the collimator 113 according to .

Due to various errors in the equipment, the X-ray irradiation area window B1 displayed on the display unit 150 and the actual X-ray irradiation area E may be different from each other. That is, there may be cases where the X-ray irradiation area window B1 does not accurately reflect the location or size of the actual X-ray irradiation area E. Accordingly, the X-ray imaging apparatus 100 may perform a procedure to verify whether the X-ray irradiation area window B1 shown in FIG. 7 accurately reflects the actual X-ray irradiation area E.

First, a method of displaying the X-ray irradiation area window B1 on the display unit 150 will be described.

The control unit 140 may display the X-ray irradiation area window B1 on the display unit 150 using pre-stored coordinate information of the X-ray imaging device 100. The control unit 140 controls the distance between the X-ray source 110 and the ) can be stored in advance or calculated from pre-stored information.

The control unit 140 can use this information to calculate the three-dimensional coordinates of the X-ray irradiation area E formed on the surface of the mounting unit 24. The three-dimensional coordinates of the X-ray irradiation area E calculated by the control unit 140 correspond to coordinates on the global coordinate system of the space where the X-ray imaging device 100 is located. The coordinate information of the X-ray irradiation area E calculated by the control unit 140 includes at least the coordinates of a vertex of the X-ray irradiation area E.

The X-ray irradiation area window B1 indicating the The three-dimensional coordinate information of the X-ray irradiation area (E) is converted into coordinates that follow the two-dimensional image coordinate system.

In addition, the camera image 152 shown in FIG. 7 is an image acquired by the imaging unit 120, and since the coordinate system of the imaging unit 120 and the global coordinate system are different, as described above, the X-ray irradiation area E In order to convert 3D coordinate information into coordinates that follow a 2D image coordinate system, the global coordinate system must be converted to a camera coordinate system. In other words, the global coordinate system must be converted to a camera coordinate system, and the 3D coordinate information converted to the camera coordinate system must be converted to coordinates that follow the 2D image coordinate system.

The conversion equation between coordinates (X, Y, Z) following the global coordinate system and coordinates (x, y) following the two-dimensional image coordinate system can be expressed as Equation 1 below. The control unit 140 uses the relationship between the global coordinate system and the image coordinate system expressed in Equation 1 below to set the three-dimensional coordinates of the X-ray irradiation area formed in the X-ray detector 200 to the It can be converted to two-dimensional coordinates of window (B1). Using the converted two-dimensional coordinates, the control unit 140 can display the X-ray irradiation area window B1 by overlapping it with the camera image displayed on the display unit 150.

<Equation 1>

In Equation 1, x and y represent the coordinates of the two-dimensional image sensor, that is, the coordinates of the image coordinate system, and X, Y, and Z represent the coordinates of the global coordinate system.

In Equation 1, the first matrix on the right side includes internal parameters of the imaging unit 120, such as the focal length and principal point of the imaging unit 120, as its elements. In Equation 1, fx and fy represent the focal length of the imaging unit 120, and cx and cy represent the main point of the imaging unit 120.

In Equation 1, the second matrix on the right side is a matrix for matching the global coordinate system with the camera coordinate system, and includes external parameters of the photographing unit 120, such as the installation direction of the photographing unit 120, as its elements.

In Equation 1, A represents the rotation angle (roll) having the z-axis of the camera coordinate system as the rotation axis, B represents the rotation angle (pitch) having the x-axis of the camera coordinate system as the rotation axis, and C has the y-axis of the camera coordinate system as the rotation axis. Indicates the rotation angle (yaw). And, t ₁ , t ₂ , and t ₃ represent the translation distance between the camera coordinate system and the global coordinate system, respectively.

FIG. 8A is a diagram conceptually showing that light representing an X-ray irradiation area is irradiated from an This diagram shows an example of displaying an X-ray irradiation area window based on the area. Figure 10 is a diagram showing an X-ray irradiation area window created using coordinate information and an X-ray irradiation area window created through image processing.

Referring to FIG. 8A , a light source included in the X-ray source 110, for example, a collimator lamp, may irradiate visible light (VL) to the same area as the X-ray irradiation area (E).

As shown in FIG. 8B, the light irradiation area (L) created on the surface of the mounting unit 24 by visible light (VL) also appears in the camera image 152. The control unit 140 extracts the boundary of the light irradiation area (L) from the camera image 152 through image processing, and creates an X-ray irradiation area based on the boundary of the extracted light irradiation area (L) as shown in FIG. 9. A window (B2) can be created. The generated X-ray irradiation area window B2 may be displayed overlapping the camera image 152. In order to distinguish between the two X-ray irradiation area windows B1 and B2, in an embodiment described later, the X-ray irradiation area window B1 generated by coordinate information is called the first The irradiation area window B2 can be referred to as the second X-ray irradiation area window B2.

The X-ray imaging device 100 according to one embodiment is configured to display the light irradiation area by a collimator lamp so that the X-ray irradiation area windows B1 and B2 displayed on the display unit 150 accurately represent the actual X-ray irradiation area E. A calibration process is performed to match (L) with the actual X-ray irradiation area (E) and determine camera parameters such as the main point, focal length, installation angle, etc. of the imaging unit 120.

If there were no errors in this calibration process, the X-ray irradiation area window B1 created using coordinate information and the X-ray irradiation area window B2 created through image processing match as shown in FIG. 10. Therefore, if the first X-ray irradiation area window B1 and the second X-ray irradiation area window B2 do not match, it may be determined that an error occurred in the above-described calibration process. Accordingly, the control unit 140 performs a process of comparing whether the first X-ray irradiation area window B1 and the second X-ray irradiation area window B2 match, thereby verifying whether an error occurred in the above-described calibration process. do.

If the positions, shapes, and sizes of the 150), etc., a message requesting calibration may be displayed. In addition, by displaying the first X-ray irradiation area window B1 and the second X-ray irradiation area window B2 overlapping on the camera image 152, it is intuitive that the two It is also possible to express it as The user can check the message and perform the above-described calibration process again.

In addition, in addition to displaying a message requesting the performance of calibration, the control unit 140 calculates the degree of discrepancy when the X-ray irradiation areas generated by the above-described two methods are inconsistent and sets calibration parameters to resolve the discrepancy. can also be calculated. It is possible to automatically perform calibration based on the calculated calibration parameters, and it is also possible to guide the user's calibration by displaying the calibration parameters on the display unit 150.

Based on the discrepancy information, the control unit 140 can calculate the focal length and main point of the photographing unit 120, which are necessary to resolve the discrepancy, and calculate variables necessary for conversion between the global coordinate system and the camera coordinate system.

Additionally, in the disclosed embodiment, since the focus of the imaging unit 120 and the focus of the X-ray tube 111 are different, offset may occur. The control unit 140 may use the discrepancy information to calculate parameters necessary for offset compensation. The control unit 140 can automatically perform calibration using the parameters calculated in this way or display the calculated parameters on the display unit 150 to assist the user in calibration.

Meanwhile, the X-ray imaging apparatus 100 according to one embodiment may perform a process of aligning the X-ray source 110 and the X-ray detector 200 prior to X-ray imaging. Alignment of the X-ray source 110 and the X-ray detector 200 can be performed by aligning the center of the X-ray irradiation area with the center of the detector 200. Hereinafter, this will be described in detail with reference to FIGS. 11 to 15.

11 to 15 are diagrams illustrating a method of aligning an X-ray source and an X-ray detector of an X-ray imaging device according to an embodiment.

As shown in FIG. 11, the control unit 140 generates the X-ray irradiation area window B3 through a method using the above-described coordinate information or a method of extracting the boundary of the The area window B3 is displayed by overlapping it with the camera image 152 acquired by the photographing unit 120.

In addition, as shown in FIG. 12, the control unit 140 controls the X-ray detector 200 by using the above-described coordinate information or by extracting the boundary of the A detector boundary line (B4) indicating the boundary of is generated, and the generated detector boundary line (B4) is displayed by overlapping it with the camera image 152 acquired by the photographing unit 120. When the X-ray detector 200 is mounted inside the mounting unit 24 as in this example, the mounting unit 24 shown in the camera image 152 can be used instead of the X-ray detector 200.

The X-ray irradiation area window B3 and the detector boundary line B4 displayed overlapping the camera image 152 may be displayed in different colors and thus distinguished from each other. 11 to 15, the X-ray irradiation area window B3 is indicated with a solid line, and the detector boundary line B4 is indicated with a dotted line.

13 and 14 show an example in which the detector boundary line B4 and the X-ray irradiation area window B3 are displayed together on the display unit 150.

As shown in FIG. 13, when the spacing (g) between the four vertices of the X-ray irradiation area window B3 and the four vertices of the detector boundary line B4 corresponding thereto are all the same, the control unit 140 It may be determined that the detector 200 and the X-ray source 110 are aligned.

Alternatively, as shown in FIG. 14, when the center c1 of the X-ray irradiation area window B3 and the center c2 of the detector boundary line B4 coincide, the control unit 140 controls the 110) can be judged to be aligned.

As shown in FIG. 15, the control unit 140 determines the intervals (g2, g3, g4, g5) between the four vertices of the X-ray irradiation area window B3 and the four vertices of the corresponding detector boundary line B4. If they are different, or if the center (c1) of the X-ray irradiation area window (B3) and the center (c2) of the detector boundary line (B4) do not match, it may be determined that the there is. In this case, the control unit 140 calculates the intervals (g2, g3, g4, g5) between the four vertices of the X-ray irradiation area window B3 and the four vertices of the corresponding detector boundary line B4. The moving distance and direction of movement of the X-ray source 110 or the X-ray detector 200 that can match the given intervals can be calculated.

The control unit 140 may match the intervals by moving the X-ray source 110 or the X-ray detector 200 according to the calculated movement distance and direction of movement of the X-ray source 110 or the X-ray detector 200.

Alternatively, the calculated moving distance and moving direction of the X-ray source 110 or the X-ray detector 200 are displayed through the display unit 150 so that the user can move the You can also guide.

Alternatively, the control unit 140 calculates the gap (g1) between the center (C1) of the The movement direction and movement distance of the X-ray source 110 or X-ray detector 200 that can be matched can be calculated. The control unit 140 moves the X-ray source 110 or the X-ray detector 200 according to the calculated moving distance of the X-ray source 110 or the can be matched.

Alternatively, the calculated moving direction or moving distance of the X-ray source 110 or the X-ray detector 200 is displayed through the display unit 150 so that the user can move the You can also guide.

The movement distance and direction of movement of the X-ray source 110 or the X-ray detector 200 may be displayed in text, and as shown in FIG. 15, an ) and the spacing between mismatched vertices or the spacing between the center of the X-ray irradiation area (C1) and the center of the detector boundary line (C2) can also be displayed as an image.

Meanwhile, when the X-ray source 110 and the X-ray detector 200 are aligned, the user inputs a predetermined operation command through the input unit 160 to determine the location of the You can adjust the size or shape. For example, the position, size, or shape of the X-ray irradiation area window B3 can be adjusted by dragging the border.

While the user is adjusting the X-ray irradiation area window B3, the X-ray irradiation area window B3 may deviate from the boundary of the X-ray detector 200.

FIG. 16 illustrates an example in which the X-ray irradiation area window displayed on the display unit of the X-ray imaging device deviates from the boundary of the X-ray detector, according to an embodiment.

As shown in FIG. 16 , a portion of the X-ray irradiation area window B3 displayed on the display unit 150 may exceed the boundary of the X-ray detector 200 shown in the camera image 152. In this example, the X-ray detector 200 is mounted inside the mounting part 24, and only the mounting part 24 appears in the camera image 152. In this case, whether it exceeds the boundary of the X-ray detector 200 can be determined based on whether it exceeds the boundary of the mounting unit 24.

FIG. 16 shows a case where a part of the X-ray irradiation area window B3 is outside the boundary of the X-ray detector 200, but the entire Of course.

If X-rays are irradiated to an area beyond the boundary of the X-ray detector 200, unnecessary X-ray overirradiation may occur. When the X-ray irradiation area window B3 exceeds the boundary of the X-ray detector 200 shown in the camera image 152, the control unit 140 operates the X-ray detector 200, as shown in FIG. ) may be displayed in a different color from the area B3-1 existing within the boundary of the X-ray detector 200 to inform the user.

For example, the control unit 140 displays the area B3-1 within the boundary of the X-ray detector 200 in green, and displays the area B3-2 outside the boundary of the X-ray detector 200 in red. The user may be notified that the X-ray irradiation area is outside the boundary of the X-ray detector 200. For reference, in the example of FIG. 15, the border of the X-ray irradiation area window B3 existing inside the boundary of the detector 200 is drawn with a solid line, and the border of the They are marked and distinguished.

Notifying that the X-ray irradiation area is outside the boundary of the It may be possible. That is, the X-ray imaging device 100 can notify the user that the X-ray irradiation area window displayed on the display unit 150 is outside the boundary of the there is.

Meanwhile, in order to determine whether the X-ray irradiation area window B3 exceeds the boundary of the The mutual position relationship of B3) can be compared.

Since X-ray imaging is performed on the X-ray irradiation area E, the X-ray irradiation area may correspond to the X-ray imaging area. When an X-ray imaging area is designated, the control unit 140 may control the collimator 113 to match the X-ray radiation area E with the designated X-ray imaging area.

It is possible for the user to directly designate the X-ray imaging area when taking an do. Hereinafter, it will be described in detail with reference to the drawings.

Figures 17 to 19 are diagrams illustrating examples of pre-setting a photographing area according to a photographing protocol, and Figure 20 is a diagram illustrating information stored in the storage unit.

As shown in Figure 17, the shooting area can be set in advance for each shooting protocol. The description of the imaging protocol is the same as described above.

In order to preset a shooting area for each shooting protocol, the display unit 150 may display a protocol setting window 154. The protocol setting window 154 may include a protocol list 154c.

The user can use the input unit 160 to select a shooting protocol for which he/she wants to set a shooting area from the protocol list 154c.

In order to input the settings of the capturing area, an object model 154b having a shape similar to that of the object may be displayed on the display unit 150, and the user may select the capturing area window 154a displayed on the object model 154b. You can set the shooting area for the selected shooting protocol by adjusting the position and size. In this example, the object is assumed to be a human body and the object model 154b is assumed to have the shape of a human body. The object model 154b can only represent a rough silhouette of the object and does not need to express a detailed structure.

For example, the size or position of the capturing area window 154a can be adjusted by placing the cursor C on the edge or vertex of the capturing area window 154a, selecting it, and then dragging.

The shape of the capturing area window 154a may be square as in the example, but it is not limited to this and can also have other shapes other than squares, such as polygons, circles, or ovals.

As a specific example of setting the shooting area for each shooting protocol, as shown in FIG. 18, the area from the subject's face to the top of the knees is set as the entire body AP, and as shown in FIG. 19, the area from the subject's neck to the waist is set as the entire body AP. The area can be set as chest AP.

As shown in FIG. 20, the set shooting area is mapped to the corresponding shooting protocol and stored in the protocol database (DB), and the protocol database may be stored in the storage unit 170.

Additionally, it is possible to map and store X-ray irradiation conditions for each imaging protocol. In this case, the X-ray irradiation conditions may be preset for each imaging protocol or may be set by the user.

During X-ray imaging, when an imaging protocol is selected, the control unit 140 may search the storage unit 170 for an imaging area mapped to the selected imaging protocol and perform X-ray imaging on the searched imaging area.

Additionally, when the X-ray irradiation conditions are mapped and stored together, X-ray imaging can be performed by applying the stored X-ray irradiation conditions.

FIG. 21 is a diagram showing the process of extracting a capture area corresponding to a capture protocol from a camera image, and FIG. 22 is a diagram showing a camera image with the extracted capture area displayed.

Before performing X-ray imaging, the user may select an imaging protocol, and the imaging unit 120 may capture the camera image 152 with the object located in front of the X-ray detector 200.

The control unit 140 may search the storage unit 170 for a shooting area mapped to the selected shooting protocol and extract the shooting area from the camera image 152.

The control unit 140 may extract a capture area from the camera image 152 by applying imaging processing such as an object recognition algorithm. For example, edge detection is applied to the camera image 152 to extract the silhouette or shape of the object, and to recognize the shooting area such as head-to-toe length (height), head or shoulder width, and leg length. Several necessary features can be detected. In this example, even if all detailed features of the object are not recognized, if the approximate height, width, etc. are recognized, necessary features can be detected based on this.

As another example, it is possible to extract the shape of an object by analyzing the difference between the camera image when the object is present and the camera image when the object is not present, and capture images by applying various imaging processing technologies such as pattern detection and face recognition of the object. The efficiency and accuracy of region extraction can be improved.

When the control unit 140 extracts the imaging area from the camera image 152, the control unit 140 can control the collimator 113 to make the X-ray irradiation area E correspond to the imaging area. That is, the collimator 113 can be controlled so that X-rays are irradiated to the imaging area. At this time, if it is necessary to move the X-ray source 110 or the X-ray detector 200, the X-ray source 110 or the X-ray detector 200 can be moved to a position corresponding to the imaging area. Additionally, if the imaging area is not covered by a single X-ray imaging, stitching imaging can be performed by dividing the imaging area.

In addition, the display unit 150 can provide the user with information about which area of the object 1 is to be photographed by displaying the extracted captured area overlaid on the camera image 152 as shown in FIG. 22. there is.

FIG. 23 is a diagram illustrating an operation of pre-setting information about the size of an object, and FIG. 24 is a diagram illustrating information about the size of an object stored in advance.

X-ray irradiation conditions for obtaining an optimal X-ray image may vary depending on the size of the object, and the allowable X-ray exposure may vary depending on the size of the object. Accordingly, the X-ray imaging apparatus 100 according to one embodiment can preset X-ray irradiation conditions corresponding to the size of the object, and the user can directly classify the size of the object.

Referring to the example of FIG. 23, the display unit 150 may display an object size setting window 156. Specifically, the display unit 150 displays the object model 154b, and the user can classify the size of the object using the input unit 160. As a specific example, you can specify height, shoulder height, and leg length to map to a specific size. Height, shoulder height, and leg length may be specified as specific values or within a certain range.

The user may directly enter values to specify height, shoulder height, and leg length, or may input values by dragging the edges of the object model 154b displayed on the display unit 150 up, down, left, and right, and input values corresponding to head height. You can also input the line (L _H ), the line corresponding to shoulder height (L _S ), and the line corresponding to leg length (L _L ) by dragging them up and down.

The object size classified by the user may be stored in the object size database, as shown in FIG. 24, and the object size database may be stored in the storage unit 170.

Object size may be classified as large, medium, small, child, infant, etc., but the embodiment of the X-ray imaging device 100 is not limited to this. It can be further refined or vice versa.

Figure 25 is a diagram showing a screen on which X-ray irradiation conditions can be set for each object size.

Referring to FIG. 25, a setting window 151 for setting X-ray irradiation conditions may be displayed on the screen 150a of the display unit 150. The user can set X-ray irradiation conditions for each object size.

The settings window 151 may display a graphical user interface (GUI) that can set X-ray irradiation conditions for each object size. For example, at the top of the settings window 151, identification tags (Large, Medium, Small, Child, Baby) that can identify pre-classified object sizes may be displayed, and the user can identify them by manipulating the input unit 160. When one of the tags is selected, a menu for setting X-ray irradiation conditions for the selected object size may be activated.

When the user moves the cursor (C) and selects the identification tag (Medium) corresponding to the current size, the object model 154b of the medium size may be displayed on the right side of the setting window 151 in conjunction with this.

When the object size for which X-ray irradiation conditions are to be set is selected, a graphical user interface for setting X-ray irradiation conditions for the selected object size may be activated.

When the graphic user interface is activated, various graphic objects that can set X-ray irradiation conditions for the selected object size are displayed. For example, a button 151a for receiving settings for tube voltage, a button 151b for receiving settings for tube current, and a button 151c for receiving settings for X-ray exposure time may be displayed. The user can select each button to set the X-ray irradiation conditions to a desired value.

In addition, a button 151d for receiving settings regarding whether to perform X-ray imaging on the stand 20 or the table 10, a button 151f for receiving settings for the collimator size, and a button 151f for receiving settings for the collimator size. Button (151g) for receiving a selection, a button (151h) for receiving settings for sensitivity, a button (151i) for receiving settings for density, and a button for receiving grid selections (151h). A button 151j for inputting a selection for a filter, a button 151k for receiving a selection for a filter, and a button 151r for receiving a selection for a focus size may be further displayed.

The object size button 151e may be linked to the selection of an identification tag. For example, when the user selects an identification tag (Medium) corresponding to the current size, the current size icon included in the object size button 151e It may be displayed with emphasis.

When the setting of the X-ray irradiation conditions for each size of the object is completed, the user can select the preset button 151n to end the setting, and when the user wants to initialize the setting, the user can select the reset button 151m.

The graphic user interface shown in FIG. 25 is only an example that can be applied to the X-ray imaging device 100, and it is obvious that the graphic user interface can be displayed in a configuration different from that of FIG. 24.

Meanwhile, setting of X-ray irradiation conditions can be done by considering not only the size of the object but also the imaging protocol. In this case, X-ray irradiation conditions can be set by subdividing each object size by imaging protocol. For example, for adult sizes, X-ray irradiation conditions can be set by dividing them into full body PA, AP, LAT, chest PA, AP, LAT, leg PA, AP, and LAT, and can be set similarly for the remaining sizes.

Additionally, when stitching imaging must be performed due to the nature of the imaging protocol, it is possible to divide the stitching area based on the object model and set X-ray irradiation conditions for each divided area.

X-ray irradiation conditions set for each object size may also be stored in the storage unit 170 and, for example, may be stored together in an object size database.

Figure 26 is a diagram showing an operation of automatically determining the size of an object based on a camera image.

When the photographing unit 120 captures a camera image, the control unit 140 can automatically determine the size of the object by analyzing the camera image.

For example, the control unit 140 applies image processing such as an object recognition algorithm to recognize the leg start point, toe, shoulder, head, etc. of the object 1 from the camera image 152, and provides the recognition result and SID ( You can calculate leg length, shoulder height, and height by considering Source to Image Distance (Source to Image Distance) or SOD (Source to Object Distance).

Alternatively, the control unit 140 applies edge detection to the camera image to extract the silhouette of the object, and considers the silhouette size and SID (Source to Image Distance) or SOD (Source to Object Distance) of the object shown in the camera image. You can also estimate the approximate size of .

For example, the relationship between the camera coordinate system based on the imaging unit 120, the global coordinate system of the space where the X-ray imaging device 100 is located, and the two-dimensional coordinate system of the camera image are stored in advance, and the transformation between these coordinate systems is performed. Using this, the size of the object silhouette displayed in the camera image in real space can be calculated.

The control unit 140 may search the storage unit 170 for X-ray irradiation conditions corresponding to the estimated object size and control the X-ray source 110, etc. according to the retrieved X-ray irradiation conditions.

Meanwhile, when the control unit 140 determines the object size, X-ray irradiation conditions mapped as default to the corresponding size may be displayed in the settings window 151. The mapped X-ray irradiation conditions can be applied as is, or the user can reset them by selecting a button corresponding to each X-ray irradiation condition. At this time, the user can reset the settings by referring to the default X-ray irradiation conditions displayed in the settings window 150a.

As mentioned earlier, if the X-ray imaging area of the object is wider than the X-ray irradiation area (E) or the detection area, which is the area where the X-ray detector 200 can detect X-ray imaging can be performed separately.

Dividing the X-ray imaging target area of an object into a plurality of regions, photographing each of the plurality of divided regions, and combining them to obtain one image may be referred to by various terms such as panoramic imaging, stitching imaging, and segmented imaging. For convenience of explanation, in the embodiments to be described in detail below, such shooting will be referred to as stitching shooting, and each of the plurality of divided areas will be referred to as a divided area. Additionally, the X-ray image for each divided area is referred to as a segmented X-ray image, and an image generated by combining a plurality of segmented X-ray images is referred to as a stitched image.

Hereinafter, embodiments related to stitching photography will be described in detail with reference to the drawings.

FIG. 27 is a diagram showing an example of a stitched image, FIG. 28 is a diagram showing an example of a shooting area divided to perform stitching shooting, and FIG. 29 is a drawing showing an overlap area between each divided area.

As shown in FIG. 27, the X-ray imaging device 100 may divide the X-ray imaging area into a plurality of regions and perform X-ray imaging separately for each divided region.

The control unit ₁₄₀ may stitch the X- _ray images for each divided area, that _is , the segmented X-ray images (X ₁ , . In this embodiment, the entire area where stitching photography is to be performed is referred to as a stitching area.

As described above, if the selected shooting protocol corresponds to stitching shooting, the worklist 155 may be converted to the camera image 152 as shown in FIG. 28. Additionally, it is possible to automatically designate the imaging area corresponding to the selected imaging protocol as the stitching area. The control unit 140 may automatically divide the stitching area. For example, the control unit 140 may perform equal division. The control unit 140 may perform equal division based on the smaller of the height of the detection area of the X-ray detector 200 and the maximum height of the X-ray irradiation area E.

As a specific example, the height of the stitching area (S), that is, the distance between the top line (L _T ) indicating the start point of the stitching area and the bottom line (L _B ) indicating the end point of the stitching area, is defined as the detection area of the X-ray detector 200. When divided by the height, if it is divided by an integer, the solution can be the number of segmented areas, that is, the number of segmented X-ray images used for stitching imaging. On the other hand, if it is not divisible by an integer, the number of divided areas becomes one more than the solution and the height of each divided area becomes smaller than the height of the detection area of the X-ray detector 200.

For example, as shown in FIG. 28, when the stitching area S is divided into three divided areas S ₁ , S ₂ , S ₃ , three segmented X-ray images corresponding to each divided area are generated. After taking the images, they can be stitched to create a single stitched X-ray image.

In order to stitch the segmented X-ray images, the boundary between each segmented X-ray image can be matched, and for this registration, the When a divided area is designated, the controller 140 controls X-rays to be irradiated to the divided area. At this time, the

In the example of FIG. 29, the 1-2 overlap area (O ₁₂ ) is located between the first divided area (S ₁ ) and the second divided area (S ₂ ), and the second divided area (S ₂ ) and the third divided area X-rays may be irradiated so that the 2nd-3rd overlap area (O ₂₃ ) is located between (S ₃ ).

X-rays are repeatedly irradiated to the overlap area (O ₁₂ , O ₂₃ ), and if a radiation-sensitive area such as the genitals or heart is located in the overlap area, the control unit 140 irradiates the overlap area to avoid overlapping irradiation to the sensitive area. It can be moved to another part or a warning can be output to the user.

Whether or not an area sensitive to radiation is located can also be determined by applying image processing such as an object recognition algorithm to the camera image 152. For example, the part located in the center of the length from head to toe, where the thighs are divided, can be judged as the area where the genitals are located, and the armpit area or the area about 20 cm or less from the shoulder is considered the area where the heart is located. You can judge.

Information about a radiation-sensitive area, for example, location information or shape information, may be stored in advance in the storage unit 170, and may also be added or changed by the user.

When outputting a warning, it can be output visually through the display unit 150 or audibly through a speaker provided in the X-ray imaging device 100. In the case of visual output, it is possible to display the overlap area directly on the display unit 150 as shown in FIG. 29, and it is also possible to display in text that the overlap area is located in the sensitive area. As long as the above information is delivered, there are no restrictions on the way the warning is output.

Additionally, the overlap areas O ₁₂ and O ₂₃ may be distorted during the registration process, and the image quality of the portion corresponding to the overlap area in the stitched image may deteriorate. Therefore, by providing information about the overlap area, the user can determine whether the overlap area is an important part of the X-ray image and deterioration in image quality should be avoided.

Figures 30 and 31 are diagrams showing the operation of automatically adjusting the overlap area.

In FIG. 29 described above, it is assumed that the 1-2 overlap area (O ₁₂ ) is located in the heart area, and the 2-3 overlap area (O ₂₃ ) is located in the genital area.

As shown in FIG. 30, the control unit 140 moves the lower border of the first division area (S ₁ ) downward to position the 1-2 overlap area (O ₁₂ ) below the heart area (① → ① '), the lower border of the second division area (S ₂ ) can be moved downward to position the 2-3 overlap area (O ₂₃ ) lower than the genital area (②→②').

Since the start and end points of the stitching area (S) remain the same, the stitching area (S) itself does not change. Therefore, when the size of the first division area (S ₁ ) exceeds the size of the detection area or maximum X-ray irradiation area of the X-ray detector 200 due to movement of the lower boundary of the first division area (S ₁ ), or If the size of the second split area (S ₂ ) exceeds _the size of the detection area or maximum X-ray irradiation area of the S ₁ ) or the second division area ( S ₂ ) can be re-divided, or the entire stitching area (S) can be re-divided into smaller pieces and then the overlap area can be controlled again.

Alternatively, as described above, when it is visually or audibly output that a radiation-sensitive area is located in the overlap area, it is also possible for the user to adjust the overlap area. In this case, by displaying the radiation-sensitive area 152d on the camera image 152 as shown in FIG. 31, the user can be guided to avoid the radiation-sensitive area and reset the overlap area. For example, the user may reset the overlap area by moving the overlap area displayed on the display unit 150 or moving the boundary line of a plurality of divided areas.

Figures 32 and 33 are diagrams for a case where a user directly designates a stitching area.

In the above example, the pre-mapped imaging area is designated as the stitching area (S) according to the selection of the imaging protocol. It is also possible for the user to specify the stitching area directly.

The camera image 152 captured by the photographing unit 120 may be displayed on the display unit 150, as shown in FIGS. 32 and 33. The display unit 150 overlaps the top line (L _T ), which designates the start point of the stitching area, and the bottom line (L _B ), which designates the end point of the stitching area, on the camera image 152. It can be displayed. The user can view the camera image 152 and intuitively know the number of split shots required to obtain a stitched image. That is, the display unit 150 displays the top line and bottom line overlapping the camera image 152, allowing the user to conveniently and intuitively determine the optimal number of split shots. Through this, over-irradiation of X-rays can be prevented.

The initially displayed top line (L _T ) and bottom line (L _B ) may be displayed at any position in the camera image 152, or, when a shooting protocol is selected, may be displayed at a position corresponding to the selected shooting protocol. .

When displayed at a random location, the bottom line (L _B ) may be located at the bottom of the camera image 152. Since the position of the toe is located at the bottom of the camera image 152 regardless of the size of the object, if the bottom line (L _B ) is located at the bottom of the camera image 152, manipulate the input unit to select the bottom line (L _B ). It can reduce the user's workload that needs to be moved.

When displayed at a location corresponding to the shooting protocol, the control unit 140 may perform image processing such as applying an object recognition algorithm to the camera image 152 to recognize the area corresponding to the shooting protocol. In this case, the user can designate the stitching area again by referring to the positions of the displayed top line (L _T ) and button line (L _B ).

Alternatively, it is possible that only one of the top line (L _T ) and the bottom line (L _B ) is displayed, and the position of the remaining one is determined by specifying the number of split shots.

The user can adjust the positions of the top line (L _T ) and bottom line (L _B ) by manipulating the input unit 160. To guide the user's operation, the display unit 150 may display a cursor C, and the cursor C may move on the screen displayed on the display unit 150 according to the user's operation of the input unit 160.

In the case where the input unit 160 is a mouse, trackball, or keyboard, when the user operates the mouse, trackball, or keyboard and inputs a command to move the top line (L _T ) or bottom line (L _B ), the cursor (C) responds to the operation. Move according to the corresponding direction and amount of movement. When the input unit 160 is a touch pad, the cursor C moves according to the direction in which the user's hand moves and the amount of movement of the user's hand.

For example, as shown in FIGS. 32 and 33, the user can drag the top line (L _T ) or the bottom line (L _B ) to move it to a desired position. The top line (L _T ) and bottom line (L _B ) can move in the vertical direction or in the longitudinal direction of the object. As described above, the stitching area (S) may be defined by the top line (L _T ) and the bottom line (L _B ). That is, the area between the top line (L _T ) and the button line (L _B ) may be the stitching area (S).

Alternatively, if the top line (L _T ) and bottom line (L _B ) are moved to positions corresponding to the selected shooting protocol, the user can move them again by referring to the positions of the moved top line (L _T ) and button line (L _B ). It is also possible to specify a stitching area.

When the stitching area S is designated, the control unit 140 can automatically divide the stitching area S. It is the same as the above-described example regarding automatic division of the stitching area S.

The control unit 140 may perform equal division in real time whenever the top line (L _T ) and the bottom line (L _B ) move and display the results. For example, as shown in Figure 32, when the stitching area (S) is divided into four division areas (S ₁ , S ₂ , S ₃ , S ₄ ), guide lines such as dotted lines are used to separate each section. Areas can be divided, and numbers from 1 to 4 are written on the guidelines dividing each area, providing information on how many areas are divided in total and what number the divided area is.

The first guideline ① is the lower limit of the maximum area that can be obtained with one X-ray imaging, the second guideline ② is the lower limit of the maximum area that can be obtained with two divided imaging, and the third guideline ③ is obtained with three divided imaging. It is the lower limit of the maximum possible area, and the fourth guideline ④ may be the lower limit of the maximum area that can be obtained through four divided shots.

Additionally, as shown in FIG. 33 , when the user drags the bottom line (L _B ) toward the top line (L _T ), the control unit 140 can perform equal division again in real time. If the stitching area (S) is reduced and divided into 3 division areas (S ₁ , S ₂ , S ₃ ), numbers 1 to 3 are written on the guide line dividing each area, dividing it into a total of 3 areas. I can tell you that it has been done.

Additionally, in order to indicate that the number of division areas is different, it is possible to display the fourth guide line separately from the first to third guide lines. For example, the fourth guide line can be distinguished by displaying it as a dotted line, making it more blurred, or displaying it in a different color.

Once the designation of the stitching area is completed, the user can select the apply button 152a, and when the apply button 152a is selected, the display unit 150 displays the split area windows (W1, W2), which will be described later, on the camera image 152. , W3) can be displayed.

In addition, after the partition window (W1, W2, W3) is displayed, if the user inputs a movement command for the top line (L _T ) or bottom line (L _B ) again, the previous screen where the guide line is displayed returns to the screen. It may be converted to enable resetting of the stitching area (S) or division area.

Even when the user directly designates the stitching area (S), as in the case described above, it is possible to determine whether a radiation-sensitive area is located in the overlap area, and issue a warning or automatically control the overlap area. Alternatively, it is possible for the user to directly divide the stitching area (S). In this case, as in the case described above, it is determined whether a radiation-sensitive area is located in the overlap area, and a warning is given to this, the overlap area is automatically controlled, or the camera image is displayed when the user enters a division for the stitching area (S). (152) By marking the radiation-sensitive area above, it is also possible to guide the input so that the overlap area is not located in that area.

In the above-described embodiment, it was explained that the control unit 140 equally divides the stitching area S. However, the embodiment of the X-ray imaging device 100 is not limited to this, and the size of each divided area can be adjusted differently. It is possible, and it is also possible for the user to directly set the size of each partition. As an example of the latter, it is possible to receive input of the start and end points of each divided area, respectively. For example, if you want to divide the stitching area (S) into three partitions, the start and end points of the first partition area (S1), the start and end points of the second partition area (S2), and the third partition area (S1) You can specify the starting and ending points of the partition area (S3).

If a user designates a stitching area by directly moving a bulky X-ray source, it may be difficult to specify the stitching area in detail and the user's work fatigue may increase.

By designating a split imaging area using images captured by a camera and automatically controlling the position of the X-ray source according to the designated divided imaging area, the imaging area can be set in detail and the user's work fatigue can be reduced.

Additionally, it is possible to prevent X-rays from being repeatedly irradiated to important body organs of the subject by automatically or manually adjusting the overlapping areas of segmented imaging.

Figures 34A to 36 are diagrams illustrating a screen that allows a user to set the width of the X-ray irradiation area for each divided area in an X-ray imaging device according to an embodiment.

Previously, the width of the divided area was fixed according to the X-ray irradiation area determined by the collimator. However, since the area occupied by the object is different for each divided region even in one object, if an X-ray irradiation area of the same width is applied to all divided regions, unnecessary over-irradiation of X-rays may occur.

Accordingly, the X-ray imaging apparatus 100 according to one embodiment can adjust the width of the X-ray irradiation area for each divided area. Since the X-ray irradiation area is determined by the collimation area, adjusting the X-ray irradiation area means controlling the collimation area.

As shown in FIG. 34A, division area windows W1, W2, and W3 corresponding to each division area may be displayed on the camera image 152. The first partition window W1 corresponds to the first partition area, the second partition window W2 corresponds to the second partition area, and the third partition window W3 corresponds to the third partition area. .

Alternatively, as shown in FIG. 34b, it is possible to display adjacent partition windows with some overlap. That is, the overlap area (O ₁₂ ) between the first partition area (S1) and the second partition area (S2), and the overlap area (O ₂₃ ) between the second partition area (S2) and the third partition area (S3). The first partition window W1 and the second partition window W2 may overlap, and the second partition window W2 and the third partition window W3 may overlap to appear.

The size of the divided area window corresponds to the size of the divided area, and the width of the divided area corresponds to the width of the X-ray irradiation area E adjusted by the collimator 113. The height of the divided area may be determined according to division by the control unit 140 or the user, and the collimator 113 may be automatically adjusted according to the determined height of the divided area.

In this embodiment, not only the height but also the width of the divided area can be adjusted. The user can input a control command to adjust the width of the partition area by dragging the left and right boundaries of the partition window (W1, W2, W3) left and right.

For example, as shown in FIG. 35, for the segmented area corresponding to the torso portion of the object, the left border of the first segmented area window W2 is shifted to the left and the right border to the left so that the entire torso can be included in the X-ray irradiation area. You can expand the width of the X-ray irradiation area by dragging to the right.

Alternatively, as shown in FIG. 36, for the segmented area corresponding to the leg portion of the object, the left border of the third segmented area window W3 is moved to the right and to the right so that the background excluding the legs can be excluded from the X-ray irradiation area. You can reduce the width of the X-ray radiation area by dragging the border to the left.

Once the setting for the width of the Information can be stored.

The settings window 151 may display a graphical user interface (GUI) that can set X-ray irradiation conditions for each divided area. For example, at the top of the settings window 151, an identification tab 151p may be displayed to identify the partition area, and each identification tab 151p-1, 151p-2, and 151p-3 may display each partition. Identification tags (#1, #2, #3) corresponding to the area may be displayed. When the user operates the input unit 160 and selects one of the identification tabs, a graphical user interface that can set X-ray irradiation conditions for the selected segment area may be activated.

Since the description of various buttons displayed on the activated graphical user interface is the same as in the above-mentioned example, the description will be omitted here.

The collimator size for each divided area, that is, the size of the X-ray irradiation area, can also be adjusted using the collimator setting button 151f displayed in the settings window 151. At this time, if the collimator size is adjusted by selecting the collimator setting button 151f, the camera image 152 displayed on the right can be linked with it and the width of the divided area windows W1, W2, and W3 can be adjusted together.

Conversely, as described above, if you adjust the width of the . For example, if the collimator size for the first division area (S1) is reduced to 14x17 by dragging the boundary of the division window (W1), the collimator setting button (151f) displayed in the settings window (151) is also reduced to a size of 14x17. It can be displayed.

Meanwhile, it is also possible for the controller 140 to automatically control the width of the X-ray irradiation area. In this case, the control unit 140 may apply image processing such as edge detection to the camera image to extract the silhouette of the object and control the width of the X-ray radiation area based on the boundary between the silhouette of the object and the background.

For example, if the boundary between the object's silhouette and the background is located inside the current X-ray irradiation area, unnecessary over-irradiation can be prevented by reducing the width of the X-ray irradiation area, and the boundary between the object's silhouette and the background is within the current When located outside the area, necessary information can be obtained by expanding the width of the X-ray irradiation area.

Once the settings of the size of the X-ray irradiation area and the You can choose.

Figures 37 and 38 are diagrams showing a screen that allows a user to select an AEC sensor in an imaging device according to an embodiment.

As described above, the AEC sensors 26a, 26b, and 26c may be used for automatic control of X-ray dose. Depending on the X-ray imaging area, all or some of the plurality of AEC sensors 26a, 26b, and 26c may be used, and selection of the AEC sensor may also be made for each divided area.

As shown in FIG. 37, a plurality of graphic objects representing the positions of the plurality of AEC sensors 26a, 26b, and 26c may be displayed inside each partition window W1, W2, and W3. For this purpose, the control unit 140 may register the geometric position of the camera image. Geometric position registration matches each point in an image with a position in the real world. At this time, the relationship between the camera coordinate system, global coordinate system, and image coordinate system described above can be used.

Additionally, the control unit 140 may acquire the positions of the AEC sensors 26a, 26b, and 26c according to the position of the X-ray detector 200. The control unit 140 may position the AEC sensors 26a, 26b, and 26c on the camera image. The control unit 140 may perform image processing to align the image and the AEC sensors 26a, 26b, and 26c and superimpose graphic objects corresponding to the AEC sensors 26a, 26b, and 26c on the image.

For example, a plurality of graphic objects may include a plurality of AEC sensor buttons (153a-1, 153b-1, 153c-1, 153a-2, 153b-2, 153c-) that can receive selection input for each of a plurality of AEC sensors. 2, 153a-3, 153b-3, 153c-3).

Users can select the AEC sensor to be used for each partition. As shown in FIG. 37, when you select the button corresponding to the AEC sensor to be used among the plurality of AEC sensor buttons 153a-1, 153b-1, and 153c-1 in the first division window W1, a settings window is displayed in conjunction with this. The selection is also reflected and displayed in the AEC selection button 151g at (151).

Conversely, as shown in FIG. 38, when a selection for an AEC sensor is entered using the AEC selection button 151g of the settings window 151, a plurality of AEC sensor buttons 153a-2, 153b-2, and 153c are displayed in conjunction with this. The selection is reflected and displayed in -2).

When a selection for an AEC sensor is input, the color of the AEC sensor button corresponding to the selected AEC sensor may change, the border may become darker, or the border may be highlighted by flashing, etc. to reflect that the corresponding AEC sensor has been selected. Alternatively, it is also possible to distinguish between selected and unselected AEC sensors with dotted and solid lines. Alternatively, on/off is displayed as text on the AEC sensor button, and when the AEC sensor button marked as on is selected, the text changes to off, and when the AEC sensor button marked as off is selected, the text changes to on. Alternatively, it is possible to turn on/off all multiple AEC sensors by selecting the check box at the top of the AEC selection button (151g).

The selected AEC sensor may be turned on when X-ray imaging is performed, and the unselected AEC sensor may be turned off when X-ray imaging is performed. Conversely, when the on state is set to default, it is also possible for the selected AEC sensor to be turned off and the unselected AEC sensor to remain on.

As described above, when the AEC sensor button displayed on the camera image 152 and the button 151g displayed in the settings window 151 are linked to each other, the user can more intuitively determine the location of the AEC sensor selected by the user.

Additionally, since the X-ray detector 200 or the mounting portions 14 and 24 are obscured by the object 1 during X-ray imaging, the user cannot directly check the location of the AEC sensor. According to this example, by displaying a graphic object indicating the position of each AEC sensor on the camera image 152, the user can intuitively and conveniently know the positional relationship between the actual object and the AEC sensor.

Additionally, when the width of the X-ray irradiation area is adjusted as described above, the AEC sensor can be selected in consideration of the adjusted width of the X-ray irradiation area. For example, when the width of the X-ray irradiation area is narrowed, only some of the AEC sensors can be selected.

Alternatively, it is possible for the control unit 140 to automatically select the AEC sensor based on the size of each divided area or the size of the X-ray irradiation area for each divided area. For example, the control unit 140 may exclude from selection AEC sensors that are located outside the X-ray irradiation area or that are unnecessary. For example, the control unit 140 may detect the outline of the object 1 by applying imaging processing such as boundary detection to the camera image 152, and the AEC sensor located outside the outline of the object 1 may be turned off. You can do it.

When the AEC sensor located outside the object 1 is not turned off, X-rays that do not pass through the object 1 can be immediately received. Therefore, the X-ray dose of the AEC sensor quickly exceeds the preset dose. In this case, the image quality of the X-ray image may deteriorate due to the insufficient amount of X-rays irradiated to the object.

Accordingly, the control unit 140 can prevent image quality deterioration of the X-ray image by turning off the AEC marker outside the object.

Even when the control unit 140 selects an AEC sensor, which AEC sensor has been selected can be displayed on the AEC selection button 151g of the settings window 151 and the AEC sensor button of the camera image 152.

When the X-ray irradiation area and X-ray irradiation conditions for each segment are set and the capture button 151l is selected, the Stitching shooting can be performed. Hereinafter, description will be made with reference to FIGS. 39A to 39C.

Figures 39A to 39C are diagrams for performing stitching imaging by controlling the tilt angle of the X-ray source in the X-ray imaging device according to an embodiment. In this embodiment, the case of taking pictures by mounting the X-ray detector 200 on the stand 20 is taken as an example.

First, before operating the X-ray imaging device 100, a calibration task is performed to calculate the positional correspondence between the image acquired through the image acquisition unit 110 and the X-ray image. Based on the results of a calibration operation performed in advance, the control unit 120 sets the first position or first angle at which the X-ray generator 130 radiates X-rays to the first division area and the Calculate the third position or third angle at which X-rays will be irradiated to the second position or second angle and the third division area.

Before performing stitching imaging, it can be assumed that the X-ray source 110 has moved to a position corresponding to the X-ray detector 200. For example, when both the stand 20 and the table 10 exist in the examination room, and the user selects the stand 20, the control unit 140 moves the X-ray source 110 to a position corresponding to the stand 20. It can be moved to . The position of the X-ray source 110 corresponding to the stand 20 may be stored in advance.

Alternatively, it is possible for the user to manually move the X-ray source 110 to a position corresponding to the stand 20.

For example, when the stitching area S is divided into three areas S1, S2, and _S3 , the tilt angle of the A first split X-ray image is taken by adjusting the angle, and _a second split Likewise, a third split X-ray image can be captured by adjusting the angle corresponding to the third split area S ₃ . At this time, the height of the X-ray source 110 from the ground may be fixed.

The control unit 140 may adjust the tilt angle of the X-ray source 110 to an angle corresponding to each divided region by transmitting a control signal to a motor that adjusts the tilt angle of the X-ray source 110.

Additionally, the control unit 140 may control the collimator 113 according to the size of the X-ray irradiation area for the first split area, second split area, and third split area. For example, when the stitching area is divided equally and the height of each divided area is the same, the positions of the second blade 113b and the fourth blade 113d can be fixed, and the width of the divided area or the width of the If set differently, the positions of the first blade 113a and the third blade 13c can also be controlled.

When the width of the X-ray irradiation area is expanded than the default value, the first blade 113a can be moved in the +x-axis direction and the third blade 113c can be moved in the -x-axis direction.

In addition, when the X-ray irradiation conditions for the first split area, the second split area, and the third split area are set differently, the X-ray source 110 or the It can be controlled accordingly.

_As another example, the _height of the It is also possible to take a second split X-ray image and then shoot a third split X-ray image by adjusting the height to correspond to the third split area S ₃ . At this time, the tilt angle of the X-ray source 110 may be fixed.

As another example, of course, it is also possible to simultaneously adjust the height and tilt angle of the X-ray source 110.

In both examples, the X-ray detector 200 moves to a position corresponding to each divided area. In order to move the X-ray detector 200, the control unit 140 may move the mounting unit 24 on which the X-ray detector 200 is mounted to a position corresponding to each divided area.

When each divided area is designated, the control unit 140 may calculate the actual position of the X-ray detector 200 such that the center of each designated divided area on the camera image corresponds to the center of the X-ray detector 200. Alternatively, as described above with reference to FIGS. 11 to 15 , the process of aligning the X-ray source 110 and the X-ray detector 200 may be applied.

Meanwhile, in the case of stitched imaging, since a plurality of X-ray images that must be stitched into one are separately photographed, the image quality of the X-ray image deteriorates if the object moves between each segmented imaging time. Therefore, when stitching shooting, it is necessary to control the posture of the object between each split shooting time. This will be described in detail below.

Figure 40 is a diagram illustrating the operation of determining the movement of an object using a camera image, and Figures 41 and 42 show control in the case of performing re-photography after stitching photography is stopped while partial segment photography has not been completed. This is the drawing shown.

Even while segmented shooting is being performed, the photographing unit 120 can capture camera images, and the captured camera images can be transmitted to the control unit 140 in real time. Additionally, the captured camera image may be displayed on the display unit 150 in real time.

Additionally, the captured camera image may be stored in the storage unit 170. In this case, stored camera images may be stored until a deletion command is input from the user, or when a preset time elapses or the preset storage capacity is exceeded, the oldest images may be automatically deleted.

As shown in FIG. 40, the control unit 140 compares the camera image 152' corresponding to the shooting point of the previous segmented X-ray image with the current camera image 152 to detect the movement of the object shown in the two camera images. You can. In this example, it is assumed that the previous segmented X-ray image is the second segmented X-ray image, and the one to be currently captured is the third segmented X-ray image.

For example, the movement of an object can be detected by analyzing the difference (d) between two images. Movement can be detected by comparing the posture of the object shown in the camera image during the second split shooting with the posture of the object shown in the current camera image.

If the detected movement is greater than a preset standard value, it may be determined that matching with the second split X-ray image is impossible even if the third split X-ray image is captured. Accordingly, the control unit 140 can visually or audibly warn that registration is impossible, or automatically stop stitching photography.

As described above, filming may be stopped while some of the segmented filming is not performed due to reasons such as the movement of the object being greater than the standard value or the state of the object becoming unstable or critical.

For example, as shown in FIG. 41, after the first split X-ray image (X ₁ ) and the second split X-ray image (X ₂ ) are photographed, X-ray imaging is performed on the third split area (S ₃ ) Filming may be stopped before it starts. In this example, it is shown that the first split X-ray image (X ₁ ) and the second split X-ray image (X ₂ ) are stitched in advance to generate _a stitched image ( After the third split X-ray image is acquired, it is also possible to stitch the first split X-ray image (X ₁ ), the second split X-ray image (X ₂ ), and the third split X-ray image (X ₃ ) all at once.

The storage unit 170 stores the first split X-ray image (X ₁ ) and the second split X-ray image ₍ there is. Information about the segmented area for stitching photography may also be stored in the camera image. When stitching photography is resumed later, the saved segmented X-ray image or camera image can be saved with an identification tag so that it can be retrieved, and the identification tag may include information that can distinguish the study. Information that can distinguish a study may be one of the subject name, date/photography time, and imaging protocol, a combination of these, or information set by the user regardless of these.

When the same stitching shooting is resumed after the stitching shooting is stopped, the control unit 140 can search for and load the camera image stored in the storage unit 170. To this end, the user can input an identification tag corresponding to the stitching shoot he or she currently wishes to resume.

As shown in FIG. 42, the current camera image can be displayed on the display unit 150, and the camera image retrieved from the storage unit 170, that is, the camera image captured at the time of the previous segmented shooting, is superimposed on it. can be displayed.

According to this example, the camera images 152' captured during the second split shooting may be displayed in an overlapping manner, and the user may guide the posture of the object by referring to the overlapping camera images. Because the two images overlap, the user can clearly see the difference in the posture of the object shown in the two images, and can guide the current posture of the object to match the posture during the second split shooting.

If the posture of the object according to the guide matches the posture during the previous split imaging, that is, if the current posture of the object matches the posture during the second split imaging, the third split imaging can be performed. Here, it is possible for the user to visually determine whether the posture matches, and it is also possible for the control unit 140 to determine it according to the motion detection criteria as described above. For example, if the object silhouette in the previous camera image 152' matches the object silhouette in the current camera image 152, it may be determined that the postures match. In addition, the user can visually or audibly output the fact that the posture during the previous segmented imaging matches the current posture and allow the user to select the X-ray imaging button, or the control unit 140 may automatically perform the segmented imaging.

When third-segment imaging is performed, a third-segment X-ray image (X ₃ ) can be obtained. The control unit 140 retrieves the first split X-ray image (X ₁ ) and _{the second} split X-ray image ( _{A stitching image (X 123 )} for the entire stitching area (S) can be generated by stitching with

Alternatively, even if stitching photography is not interrupted and then resumed, as described above, the camera image acquired during the previous segmented shooting can be superimposed on the current camera image to guide the posture of the object.

For example, as described above, if the patient's movement is large and the next segmented imaging cannot be performed, the camera image 152' acquired during the previous segmented imaging is converted into the current camera image 152 without stopping the stitching imaging. It is possible to guide the posture of an object by superimposing it on top.

Hereinafter, a method of controlling an X-ray imaging device according to an embodiment will be described.

The X-ray imaging device 100 described above may be used in the control method of the X-ray imaging device according to one embodiment. Accordingly, the above description can be equally applied to the control method of the X-ray imaging device.

Figure 43 is a flowchart showing an example of a method for verifying an X-ray irradiation area in a method for controlling an X-ray imaging device according to an embodiment.

Referring to FIG. 43, the control unit 140 generates an X-ray irradiation area window displayed on the display unit 150 using coordinate information of the X-ray imaging device 100 (410). The control unit 140 may obtain the location and size of the X-ray irradiation area window using pre-stored coordinate information of the X-ray imaging device 100.

The control unit 140 controls the distance between the X-ray source 110 and the X-ray detector 200, the shape and area of the slot (R) to which the Information such as the distance to can be stored in advance or calculated from pre-stored information.

The control unit 140 can use this information to calculate three-dimensional coordinates of the X-ray irradiation area E formed in the X-ray detector 200. The three-dimensional coordinates of the X-ray irradiation area E calculated by the control unit 140 correspond to coordinates on the global coordinate system of the space where the X-ray imaging device 100 is located.

The X-ray irradiation area window B1 is displayed overlapping the camera image acquired by the imaging unit 120, and the overlapping X-ray irradiation area window B1 follows a two-dimensional coordinate system, so the control unit 140 calculates The 3D coordinate information of the X-ray irradiation area (E) must be converted into coordinates that follow the 2D image coordinate system.

In addition, since the coordinate system of the imaging unit 120 and the global coordinate system are different, as described above, in order to convert the three-dimensional coordinate information of the X-ray irradiation area (E) into coordinates that follow the two-dimensional image coordinate system, the global coordinate system It must be converted to . In other words, the global coordinate system must be converted to a camera coordinate system, and the 3D coordinate information converted to the camera coordinate system must be converted to coordinates that follow the 2D image coordinate system.

Using the converted two-dimensional coordinates, the control unit 140 can display the X-ray irradiation area window B1 by overlapping it with the camera image of the display unit 150.

In addition, the control unit 140 performs image processing on the light irradiation area image (L) of the collimator 113 obtained by the imaging unit 120 to generate an X-ray irradiation area window (B2) displayed on the display unit 150. Do (411).

As described above, the X-ray irradiation area window B1 may be displayed on the display unit 150 using coordinate information, and the boundary of the light irradiation field L appearing in the camera image acquired by the imaging unit 120 may be image processed. The X-ray irradiation area window (B2) can be displayed by extracting through .

If the X-ray irradiation area window B1 generated using coordinate information and the X-ray irradiation area window B2 generated through image processing do not match (No in 412), the control unit 140 performs calibration (413). .

The X-ray imaging device 100 according to the disclosed embodiment adjusts the collimator lamp and the reflector so that the X-ray irradiation area window displayed on the display unit 150 accurately represents the actual It matches the irradiation area and goes through a calibration process to determine camera parameters such as the main point of the imaging unit 120, focal length, installation angle, etc.

If there were no errors in this calibration process, the X-ray irradiation area window created using coordinate information and the X-ray irradiation area window created through image processing match. Therefore, if the X-ray irradiation area created using coordinate information and the X-ray irradiation area generated through image processing do not match, it may be determined that an error occurred in the above-described calibration process.

Therefore, the control unit 140 performs a process of comparing whether the X-ray irradiation area window B1 created using coordinate information and the Perform a process to verify whether an error has occurred.

If the X-ray irradiation areas created using the two methods described above do not match, this indicates that an error occurred during the calibration process, and the control unit 140 sends a message requesting calibration to be performed through the display unit 150, etc. can be displayed. The user can check the message and perform the above-described calibration process again.

In addition, in addition to displaying a message requesting calibration, the control unit 140 calculates the degree of discrepancy when the X-ray irradiation areas generated by the two methods described above are inconsistent and sets camera parameters to resolve the discrepancy. can also be calculated. Based on the discrepancy information, the control unit 140 can calculate the focal length and main point of the photographing unit 120, which are necessary to resolve the discrepancy, and calculate variables necessary for conversion between the global coordinate system and the camera coordinate system. Additionally, in the disclosed embodiment, since the focus of the imaging unit 120 and the focus of the X-ray tube 111 are different, offset may occur. The control unit 140 may use the discrepancy information to calculate parameters necessary for offset compensation. The control unit 140 can automatically perform calibration using the parameters calculated in this way or display the calculated parameters on the display unit 150 to assist the user in calibration.

Figure 44 is a flowchart showing an example of a method for aligning an X-ray source and an X-ray detector in a method for controlling an X-ray device according to an embodiment.

As shown in FIG. 44, the control unit 140 displays the boundary of the X-ray detector 200 on the display unit 150 (420) and displays the X-ray irradiation area (421).

In order to display the X-ray irradiation area, the control unit 140 generates the The area window B3 can be displayed by overlapping it with the camera image 152.

In addition, in order to display the boundary of the X-ray detector 200, the control unit 140 extracts the boundary of the A boundary line (B4) can be created, and the generated detector boundary line (B4) can be displayed by overlapping it with the camera image 152.

The X-ray irradiation area window B3 and the detector boundary line B4 displayed overlapping in the camera image 152 may be displayed in different colors to be distinguished from each other, or may be distinguished from each other by a dotted line or a solid line.

The control unit 140 determines (422) whether the center of the detector boundary line (B4) and the center of the The moving distance of the X-ray source 110 and the X-ray detector 200 is calculated based on the degree of discrepancy between the centers of the area window B3 (423). Additionally, the direction of movement can also be calculated, and the control unit 140 moves and aligns the X-ray source 110 and the X-ray detector 200 according to the calculated movement distance and direction (424).

When the intervals between the four vertices of the It can be judged that it is sorted.

Alternatively, if the center of the X-ray irradiation area window B3 and the center of the detector boundary line B4 coincide (example of 422), the control unit 140 may determine that the X-ray detector 200 and the X-ray source 110 are aligned. there is.

The control unit 140 determines whether the intervals between the four vertices of the If the centers of B4) do not match, it may be determined that the X-ray detector 200 and the X-ray source 110 are not aligned. In this case, the control unit 140 calculates the intervals (g2, g3, g4, g5) between the four vertices of the X-ray irradiation area window B3 and the four vertices of the corresponding detector boundary line, and uses the calculated intervals The movement distance and direction of movement of the X-ray source 110 or X-ray detector 200 that can be matched can be calculated. The control unit 140 may match the intervals by moving the X-ray source 110 or the X-ray detector 200 based on the calculated movement distance and direction of movement of the X-ray source 110 or the X-ray detector 200. Alternatively, the calculated moving direction and moving distance of the X-ray source 110 or the You can also guide.

Alternatively, the control unit 140 calculates the interval g1 between the center of the X-ray irradiation area window B3 and the center of the detector boundary line B4, and the center of the X-ray irradiation area window B3 based on the calculated interval. It is possible to calculate the moving direction or moving distance of the X-ray source 110 or the The control unit 140 moves the X-ray source 110 or the X-ray detector 200 based on the movement direction and movement distance of the X-ray source 110 or the The center and the center of the detector boundary line (B4) can be aligned. Through this, the actual X-ray irradiation area and the center of the X-ray detector 200 can be aligned. Alternatively, the calculated moving direction and moving distance of the X-ray source 110 or the You can also guide.

When the center of the detector boundary line (B4) coincides with the center of the X-ray irradiation area window (B3), the control unit 140 receives a command for adjusting the If there is a part of (B3) outside the detector boundary line (B4) (example of 426), the part outside the detector boundary line (B4) is displayed (427).

When the X-ray source 110 and the The shape can be adjusted.

While the user is adjusting the X-ray irradiation area window (B3), the X-ray irradiation area window (B3) may deviate from the detector boundary line (B4). If X-rays are irradiated to an area beyond the boundary of the X-ray detector 200, unnecessary X-ray overirradiation may occur. Accordingly, when the ) can be displayed differently from the area (B3-1) that exists within it to inform the user. For example, the control unit 140 displays the area within the detector boundary line B4 in green, and displays the area outside the detector boundary line B4 in red to indicate to the user that the X-ray irradiation area is within the boundary of the X-ray detector 200. It can be notified that it is out of bounds. Alternatively, it is also possible to provide a notification about an area outside the boundary of the X-ray detector 200 based on the difference between the dotted line and the solid line rather than the difference in color.

Notifying that the X-ray irradiation area is outside the boundary of the detector 200 through a difference in color or a difference between a dotted line and a solid line is just an example, and may be notified through sound or through vibration of the input unit 160. . In other words, the X-ray apparatus 100 according to the disclosed embodiment notifies the user that the can be notified to

Figure 45 is a flowchart of a method for setting an imaging protocol in a method for controlling an X-ray imaging device according to an embodiment.

Referring to FIG. 45, a shooting area is set for each shooting protocol (430). Setting of the shooting area can be done according to the user's input. To this end, the display unit 150 may display a shooting protocol setting window 154. The shooting protocol setting window 154 may include a protocol list 154c.

The user can use the input unit 160 to select a shooting protocol for which he/she wants to set a shooting area from the protocol list 154c. In order to input the settings of the capturing area, an object model 154b having a shape similar to that of the object may be displayed on the display unit 150, and the user may select the capturing area window 154a displayed on the object model 154b. You can set the shooting area for the selected shooting protocol by adjusting the position and size. The shooting area set for each shooting protocol is stored in the storage unit 170.

Thereafter, before performing X-ray imaging, a camera image is captured using the imaging unit 120 (431). There may be a time difference between X-ray imaging and the imaging area for each imaging protocol.

Select a shooting protocol (432). Selection of the shooting protocol may be made by user input.

The imaging area mapped to the selected imaging protocol is searched (433). Search of the shooting area may be performed by the control unit 140. For example, if the selected imaging protocol is chest PA, the imaging area mapped and stored in chest PA is searched.

The shooting area is extracted from the camera image (434). For example, the control unit 140 may extract the capture area from the camera image 152 by applying image processing such as an object recognition algorithm. For example, edge detection is applied to the camera image 152 to extract the silhouette or shape of the object, and to recognize the shooting area such as head-to-toe length (height), head or shoulder width, and leg length. Several necessary features can be detected.

X-ray imaging is performed by radiating X-rays to the imaging area (435). When the control unit 140 extracts the imaging area from the camera image 152, the control unit 140 controls the collimator 113 to correspond to the X-ray radiation area E to the imaging area, and the X-ray source 110 or When the X-ray detector 200 needs to be moved, the X-ray source 110 or the X-ray detector 200 can be moved to a position corresponding to the imaging area. Additionally, if the imaging area is not covered by a single X-ray imaging, stitching imaging can be performed by dividing the imaging area.

Figure 46 is a flowchart of a method for determining whether to stop segmented imaging according to movement of an object in a method for controlling an X-ray imaging device according to an embodiment. In this example, stitching photography is performed, and the stitching area is divided into a first divided area, a second divided area, and a third divided area.

Referring to FIG. 46, a camera image is captured using the photographing unit 120 (440). The imaging unit 120 may capture video in real time, and camera images may also be captured until X-ray imaging is completed.

The first segment imaging is performed (441). To this end, the position or tilt angle of the X-ray source 110 can be controlled to a position or angle corresponding to the first division area, and the position of the there is.

The movement of the object is detected (442). Specifically, the control unit 140 may detect movement by comparing the posture of the object shown in the current camera image with the posture of the object shown in the camera image during the first split shooting.

If the movement of the detected object is greater than the preset reference value (example 443), it is determined that matching the first split X-ray image and the second split X-ray image is impossible even if segmented imaging is performed, and the imaging may be stopped.

If the movement of the detected object is not greater than the preset standard value (No in 443), second segment imaging is performed (444).

The movement of the object is detected (445). The control unit 140 may detect movement by comparing the posture of the object shown in the current camera image with the posture of the object shown in the camera image during the second split shooting.

If the movement of the detected object is greater than the preset reference value (example of 446), it is determined that registration of the second split X-ray image and the third split X-ray image is impossible even if segmented imaging is performed, and the imaging may be stopped.

If the movement of the detected object is not more than the preset standard value (No in 446), third segment imaging is performed (447).

Alternatively, it is also possible to guide the posture of the object by outputting a warning to the user without stopping the shooting.

When the third split X-ray image is completed, one stitched image can be created by stitching the captured first split X-ray image, second split X-ray image, and third split X-ray image.

Figure 47 is a flowchart for a case of resuming stitching imaging in a method for controlling an X-ray imaging device according to an embodiment.

As described above, filming may be stopped while some of the segmented filming is not performed due to reasons such as the movement of the object being greater than the standard value or the state of the object becoming unstable or critical.

When stitching photography is stopped, the already photographed segmented X-ray image is stored in the storage unit 170, and the camera image captured at the time of segment imaging can also be stored together. Information about the segmented area for stitching shooting can also be stored in the camera image.

Then, when stitching shooting is resumed again (450), the control unit 140 can search for and load the camera image that is mapped and stored in the storage unit 170 to the resumed stitching shooting.

The display unit 150 may display the previous camera image by overlaying it on the current camera image (451). The user can guide the posture of the object by referring to the overlaid camera image. Because the two images are overlaid, the user can clearly see the difference in the posture of the object shown in the two images and can guide the current posture of the object to match the posture during the second split shooting.

Figure 48 is a flowchart of a method of controlling an overlap area in a method of controlling an X-ray imaging device according to an embodiment.

Referring to FIG. 48, the stitching area where stitching photography will be performed is designated (460). The stitching area can be designated by direct input from the user, or automatically by selecting a shooting protocol. That is, the imaging area corresponding to the selected imaging protocol may be designated as the stitching area.

Divide the stitching area (461). For example, the control unit 140 may perform equal division by considering the size of the stitching area and the size of the detection area of the X-ray detector 200.

It is determined whether the overlap area is located in a radiation-sensitive area (462). Whether a radiation-sensitive area is located can also be determined by applying an object recognition algorithm. For example, the part located in the center of the length from head to toe, where the thighs are divided, can be judged as the area where the genitals are located, and the armpit area or the area about 20 cm or less from the shoulder is considered the area where the heart is located. You can judge. Information about areas sensitive to radiation can be stored in advance in the storage unit 170, and can also be added or changed by the user.

If the overlap area is located in a radiation-sensitive area (example 462), the overlap area can be adjusted (463). Adjustment of the overlap area can be performed automatically by the control unit 140, or can be adjusted based on user input. In the former case, the control unit 140 can adjust the boundaries of the corresponding division areas so that the overlap area can avoid areas that are sensitive to radiation. In the latter case, the location of the area sensitive to radiation can be displayed on the display unit 150 to guide the user's input.

Figure 49 is a flowchart of a method of presetting the size of an object in a method of controlling an X-ray imaging device according to an embodiment.

Referring to FIG. 49, the object size is set and stored (470). As an example, the display unit 150 may display an object size setting screen 155. Specifically, the display unit 150 displays the object model 154b, and the user can classify the size of the object using the input unit 160. As a specific example, you can specify height, shoulder height, and leg length to map to a specific size. Height, shoulder height, and leg length may be specified as specific values or within a certain range. The object size classified by the user may be stored in the object size database, and the object size database may be stored in the storage unit 170. Object size may be classified as large, medium, small, child, infant, etc., but the embodiment of the X-ray imaging device 100 is not limited to this. It can be further refined or vice versa.

X-ray irradiation conditions are set for each object size and stored (471). For example, the display unit 150 may display a setting window 150a through which X-ray irradiation conditions can be set. The user can set X-ray irradiation conditions for each object size. X-ray irradiation conditions that can be set may include tube voltage, tube current, and exposure time, and conditions for The set X-ray irradiation conditions are stored in the storage unit 170 for each object size.

After the object size and X-ray irradiation conditions are set, when the object is positioned in front of the X-ray detector 200 for X-ray imaging, the imaging unit 120 can capture a camera image. Then, the control unit 140 analyzes the camera image and determines the object size (472). For example, the control unit 140 extracts the silhouette of an object by applying edge detection to the camera image, and considers the silhouette size and Source to Image Distance (SID) or Source to Object Distance (SOD) of the object shown in the camera image. Thus, the approximate size of the object can be estimated.

X-ray irradiation conditions corresponding to the object size are searched (473). Then, the X-ray source is controlled according to the retrieved X-ray irradiation conditions (474). In addition, of course, if the X-ray irradiation conditions stored corresponding to the object size include conditions related to the X-ray detector 200, the X-ray detector 200 can be further controlled.

Some of the operations of the above-described X-ray imaging device and its control method may be stored as a program in a computer-readable recording medium. The recording medium may be a magnetic recording medium such as a ROM, floppy disk, or hard disk, or an optical recording medium such as a CD-ROM or DVD. However, the type of recording medium is not limited to the above examples.

The recording medium may be included in a server that provides an application or program, and a workstation, sub-display device, or mobile device may connect to this server through a communication protocol such as the Internet and download the program.

For example, when the above-described display unit 150 and input unit 160 are included in a mobile device, if the mobile device downloads and installs a program and then runs it, the above-described screen may be displayed on the display unit 150. .

The program may also include steps for executing some of the operations of the control unit 140 described above. In this case, it is also possible for the mobile device to generate a control command and transmit it to the X-ray imaging device 100.

Alternatively, the mobile device may transmit information about what control command the user inputted to the X-ray imaging apparatus 100, and the control unit 140 may control the X-ray imaging apparatus 100 according to the user's control command.

The above description is merely an illustrative explanation of the technical idea, and those skilled in the art will be able to make various modifications, changes, and substitutions without departing from the essential characteristics. Accordingly, the embodiments disclosed above and the attached drawings are for illustrative purposes rather than limiting the technical idea, and the scope of the technical idea is not limited by these embodiments and the attached drawings. The scope of protection should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of rights.

100: X-ray imaging device
110: X-ray source
111: X-ray tube
120: Filming Department
140: control unit
150: Display unit
160: input unit
200: X-ray detector

Claims (50)

A camera that captures a camera image of an object placed on a movable table;
An X-ray source that generates and irradiates X-rays;
Memory to store shooting protocols;
display; and
receive information regarding selection of said imaging protocol;
Photographing an object placed on the table based on a camera image using depth information acquired through the camera, an imaging area corresponding to selection of the imaging protocol, and a camera image acquired on a table located at a first distance from the X-ray source. identify the location of the area,
Controlling the display to display a camera image of the object and an indicator indicating the capture area on the camera image based on the identified location,
An X-ray imaging device comprising: a control unit generating the X-rays and controlling the X-ray source to irradiate the X-rays toward an object placed on a table located at a second distance from the X-ray source. According to claim 1,
The input unit,
An X-ray imaging device that receives a selection from a user regarding an X-ray imaging area to be mapped for each of the X-ray imaging protocols. According to claim 2,
An X-ray image further comprising a display unit that displays a graphic object having the shape of an object to receive a selection regarding the X-ray imaging area, and displays an imaging area window designating the X-ray imaging area over the graphic object. Device. According to claim 3,
The control unit,
When at least one of the position and size of the imaging area window is adjusted through the input unit, an area corresponding to at least one of the adjusted position and size of the imaging area window is stored in the storage unit as the X-ray imaging area. According to claim 1,
An X-ray imaging device further comprising a display unit that displays the camera image and displays the extracted X-ray imaging area by overlapping it on the camera image. According to claim 5,
The display unit,
An X-ray imaging device that displays a protocol list for receiving a selection input for the X-ray imaging protocol, and displays the camera image when a command to display the camera image is input through the input unit. According to claim 2,
The input unit,
Receive settings for X-ray irradiation conditions for each X-ray imaging protocol,
The storage unit,
An X-ray imaging device that maps and stores the set X-ray irradiation conditions for each X-ray imaging protocol. According to claim 7,
The control unit,
When an X-ray imaging protocol is selected, an X-ray imaging device performs X-ray imaging by applying X-ray irradiation conditions mapped to the selected X-ray imaging protocol. a display unit that displays a graphical user interface for receiving settings for X-ray irradiation conditions for each size of the object;
a storage unit that maps and stores the X-ray irradiation conditions for each size of the object according to the input;
A filming unit that takes camera images;
An X-ray imaging device comprising a control unit that recognizes the size of the object shown in the camera image and performs X-ray imaging by applying X-ray irradiation conditions mapped to the recognized size of the object. According to clause 9,
The display unit,
An X-ray imaging device that displays the size of the recognized object. According to clause 9,
The storage unit,
An X-ray imaging device that maps and stores the X-ray irradiation conditions according to the size of the object and the X-ray imaging protocol. According to claim 11,
The control unit,
An X-ray imaging device that, when an X-ray imaging protocol is selected, performs X-ray imaging by applying the selected X-ray imaging protocol and X-ray irradiation conditions mapped to the size of the recognized object. An X-ray source equipped with a photographing unit for capturing camera images and a light source for irradiating visible light to an X-ray irradiation area;
Calculate the position of the X-ray irradiation area in the camera image based on the coordinate information of the a control unit that calculates a position in the image and determines that calibration is necessary if the position of the X-ray irradiation area and the position of the light irradiation area do not match; and
An X-ray imaging device comprising: a display unit that displays information related to the calibration when the calibration is necessary. According to claim 13,
The display unit,
An X-ray imaging device that displays a first X-ray irradiation area window corresponding to the calculated position of the X-ray irradiation area, and displays a second X-ray irradiation area window corresponding to the calculated position of the light irradiation area. According to claim 14,
The control unit,
An X-ray imaging device that determines that calibration is necessary when at least one of the positions, shapes, and sizes of the first X-ray irradiation area window and the second X-ray irradiation area window do not match each other. According to claim 13,
The control unit,
An X-ray imaging device that calculates calibration parameters based on the difference between the first X-ray irradiation area window and the second X-ray irradiation area window when the calibration is necessary. According to claim 16,
The display unit,
An X-ray imaging device that displays the calculated calibration parameters. According to claim 16,
The control unit,
An X-ray imaging device that automatically performs the calibration based on the calculated calibration parameters. According to claim 13,
The control unit,
A detector boundary line is extracted by extracting the boundary of the X-ray detector shown in the camera image or the mounting portion on which the X-ray detector is mounted, An X-ray imaging device that determines whether the X-ray detector and the X-ray source are aligned based on the detector boundary line. According to claim 19,
The control unit,
An X-ray imaging device that determines that the X-ray detector and the X-ray source are aligned when the intervals between the plurality of vertices forming the X-ray irradiation area window and the plurality of vertices forming the detector boundary line all match. According to claim 19,
The control unit,
An X-ray imaging device that determines that the X-ray detector and the X-ray source are aligned when the center of the X-ray irradiation area window coincides with the center of the detector boundary line. According to claim 19,
The display unit,
An X-ray imaging device that displays the detector boundary line and the X-ray irradiation area window by overlapping them on the camera image. According to claim 22,
The control unit,
An X-ray imaging device that calculates a moving distance or direction of movement of an X-ray source or an X-ray detector to align the X-ray source and the X-ray detector. According to claim 23,
The control unit,
An X-ray imaging device that moves the X-ray source or the X-ray detector based on the calculated movement distance or direction. According to claim 23,
The display is,
An X-ray imaging device that displays the calculated movement distance or direction. According to claim 13,
The display unit,
Displaying an X-ray irradiation area window at the calculated X-ray irradiation area or the location of the calculated light irradiation area,
The X-ray imaging device further includes an input unit that receives a command to adjust the position or size of the X-ray irradiation area window from the user. According to claim 26,
The display unit,
An X-ray imaging device that, when the X-ray irradiation area window deviates from the boundary of the X-ray detector shown in the camera image or the mounting portion on which the X-ray detector is mounted, according to the input adjustment command, displays the area outside the boundary. In the X-ray imaging device that generates one X-ray image by stitching a plurality of X-ray images for a plurality of divided areas,
An X-ray source equipped with an imaging unit that acquires camera images and a collimator that adjusts the X-ray irradiation area;
a display unit that overlaps and displays a plurality of divided area windows indicating sizes and positions of the plurality of divided areas on the camera image; and
An X-ray imaging device comprising: a control unit that controls the collimator to adjust the width of the X-ray irradiation area for at least one of the plurality of divided areas. According to clause 28,
It further includes an input unit that receives a command for controlling the width of the X-ray irradiation area,
The control unit,
An X-ray imaging device that controls the collimator according to the input command. According to clause 28,
The control unit,
An X-ray imaging device that controls the collimator so that the width of the X-ray radiation area corresponds to the width of the object shown in the camera image. According to claim 30,
The control unit,
An X-ray imaging device that extracts the outline of the object from the camera image and determines the width of the X-ray irradiation area based on the boundary between the extracted outline and the background. According to clause 28,
It further includes a plurality of AEC sensors that control the amount of X-rays emitted from the X-ray source,
The control unit,
An X-ray imaging device that selects at least one of the plurality of AEC sensors based on the width of the adjusted X-ray irradiation area. In the X-ray imaging device that generates one X-ray image by stitching a plurality of X-ray images for a plurality of divided areas,
A filming unit that takes camera images;
A display unit that displays the camera image; and
An X-ray imaging device comprising: a control unit that determines whether an overlap area where the plurality of divided areas overlap is located in a preset area based on the camera image. According to claim 33,
The control unit,
An X-ray imaging device that moves the overlap area so that the overlap area is not located in the preset area. According to claim 33,
The display unit,
An X-ray imaging device that displays the overlap area by overlapping it on the camera image and outputs a warning to the user when the overlap area is located in the preset area. According to claim 35,
The X-ray imaging device further includes an input unit that receives a user's command to move the overlap area. Save the imaging protocol;
receive information regarding selection of the imaging protocol;
A camera image using depth information acquired through a camera that captures a camera image of an object placed on a movable table, an imaging area corresponding to the selection of the imaging protocol, and an X-ray source located at a first distance from the Identifying the location of an imaging area of an object placed on the table based on a camera image acquired from the table;
Controlling a display to display a camera image of the object and an indicator indicating the capture area on the camera image based on the identified location;
A method of controlling an According to clause 37,
Saving the shooting protocol includes:
Receiving a selection from the user regarding an X-ray imaging area to be mapped for each X-ray imaging protocol;
A control method of an X-ray imaging device comprising mapping and storing the X-ray imaging area for each X-ray imaging protocol according to the input. Displaying a graphical user interface for receiving settings for X-ray irradiation conditions for each size of the object;
mapping and storing the X-ray irradiation conditions for each size of the object according to the input;
capture camera footage;
Recognize the size of the object shown in the camera image;
A control method of an X-ray imaging device comprising a control unit that performs X-ray imaging by applying X-ray irradiation conditions mapped to the size of the recognized object. According to clause 39,
A method of controlling an X-ray imaging apparatus further comprising displaying the size of the recognized object. Visible light is radiated to the X-ray irradiation area;
capture camera footage;
Calculate the location of the X-ray radiation area in the camera image based on coordinate information of the X-ray source;
extracting a light irradiation area irradiated with visible light displayed in the camera image, and calculating a position of the extracted light irradiation area in the camera image;
A method of controlling an According to claim 41,
extracting a detector boundary line by extracting a boundary of the X-ray detector shown in the camera image or a mounting portion on which the X-ray detector is mounted;
X-rays further comprising: determining whether the X-ray detector and the X-ray source are aligned based on the calculated X-ray irradiation area or an Control method for video devices. According to claim 41,
displaying an X-ray irradiation area window at the calculated X-ray irradiation area or at a position of the calculated light irradiation area;
A method of controlling an X-ray imaging device further comprising receiving a command to adjust the position or size of the X-ray irradiation area window from a user. According to claim 43,
If the X-ray irradiation area window deviates from the boundary line of the X-ray detector shown in the camera image or the mounting portion on which the control method. capture camera footage;
Overlapping and displaying a plurality of divided area windows indicating the size and position of the plurality of divided areas on the camera image;
Controlling the collimator to adjust the width of the X-ray irradiation area for at least one of the plurality of divided areas. According to claim 45,
Further comprising: receiving a command for controlling the width of the X-ray irradiation area,
Controlling the collimator includes:
A control method of an X-ray imaging device including controlling the collimator according to the input command. According to claim 45,
Controlling the collimator includes:
Controlling the collimator so that the width of the X-ray radiation area corresponds to the width of the object shown in the camera image. According to claim 45,
The method of controlling an X-ray imaging apparatus further comprising: selecting at least one of a plurality of AEC sensors for each of the plurality of divided areas based on the width of the adjusted capture camera footage;
displaying the camera image; and
Overlapping and displaying a plurality of divided areas where stitching photography will be performed on the camera image;
A control method of an X-ray imaging apparatus comprising: determining whether an overlap area where the plurality of divided areas overlap is located in a preset area. According to clause 49,
A method of controlling an X-ray imaging apparatus further comprising: moving the overlap area when the overlap area is located in the preset area.

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