KR101768520B1 - A method of integrated operation of chest X-ray digital radiography and chest digital tomosynthesis - Google Patents

Abstract

A chest X-ray image of a patient, which is a digital X-ray general radiographic image, having different photographing conditions, and a chest reconstructed cross-sectional image, which is a digital tomographic image composite image, are integrated and displayed at one time, and a reconstructed cross- A control method of a digital X-ray imaging system in which projection images of angles are displayed together.
A control method of a digital X-ray imaging system of the present invention is a control method of a digital X-ray imaging system, wherein an X-ray tube is positioned behind a back of a patient located in front of an X-ray detector and a data acquiring unit acquires an image of a patient's chest PA (backward direction) PA imaging; After the chest PA imaging step, the control unit changes the imaging condition to horizontally move the X-ray tube so that the distance between the X-ray tube and the X-ray detector is 100 cm. An X-ray tube is rotated by a predetermined angle along a circumference of the patient, and the chest image is acquired by the data acquisition unit and transmitted to the server by angles; A tomosynthesis image acquisition step of generating a tomosynthesis image by reconstructing an angular chest image obtained at an angle chest radiography step; After the reconstructed image acquisition step, the server outputs a chest PA image, a chest radiography image at angles, and a tomosynthesis image through an output unit.
In the photographing condition changing step, an offset size for aligning the X-ray beam center is measured using a laser generator (laser light source) mounted on the side of the X-ray tube and a laser detector on one side of the detector support .

Description

Technical Field [0001] The present invention relates to a control method of a digital X-ray imaging system for collectively and continuously acquiring images of digital X-ray general imaging and digital tomographic imaging of a chest,

A chest X-ray image of a patient, which is a digital X-ray general radiographic image, having different photographing conditions, and a chest reconstructed cross-sectional image, which is a digital tomographic image composite image, are integrated and displayed at one time, and a reconstructed cross- A control method of a digital X-ray imaging system in which projection images of angles are displayed together.

General thoracic X-ray is the most basic examination of thoracic diagnosis. It is used to diagnose the chest (posterior thoracic PA) and lateral thoracic images (left / right) However, in general thoracic examination, there is a disadvantage that the resolution in the depth direction is very low due to superposition of human body structures. To solve this problem, CT image is provided by taking a CT image. However, . In order to compensate for this, tomosynthesis (tomographic image synthesis), which has a lower exposure dose than CT and provides a higher depth resolution than a general imaging, is in the spotlight recently. In particular, Tomo Synthesis uses about 7 times lower dose than CT and shows about 3 times more diagnostic efficiency than general X-ray.

Therefore, if comparing and analyzing by providing tomosynthesis and chest X-ray together, it is possible to maximize diagnostic efficiency while reducing the number of unnecessary chest CT examinations.

Digital tomosynthesis system (DTS) is a 3D tomography (CT) system, which is a 3D tomography (CT) system, It is a system to reconfigure, and in the present market, it is equipped with a tomographic image synthesis function in general X-ray imaging function. Such a system uses a general photograph as a basis, and when an additional tomographic image synthesis is required, the photographing is carried out by angle.

1 is a schematic block diagram of a digital tomographic image synthesis system.

The digital tomographic image synthesis system DTS positions the patient 10 in front of the X-ray detector 40 and radiates X-rays from the X-ray tube (X-ray generator) Is placed on a rotatably installed gantry 30, and an X-ray tube 30 and an X-ray detector 20 are fixed. In order to obtain a reconstructed image (tomosynthesis image, tomogram synthesized image), the gantry 30 rotates and photographs the circumference of the patient 10, so that the circumference of the patient 10 is surrounded by the X- 30). The server 70 generates and transmits a gantry control signal and an X-ray tube control signal to the X-ray controller 35 and the gantry controller 55 and receives image data from the X-ray detector 40, Tomo Synthesis video). The reconstructed image is stored in the memory unit 90 or outputted through an output unit 80 including a monitor or a printer. Here, the X-ray control unit 35 and the gantry control unit 55 are referred to as a control unit 31. [

In some cases, the patient 10 is fixed in a digital tomographic image synthesis system (DTS) and the x-ray tube 30 and x-ray detector 20 may be moved to take a picture of the circumference of the patient 10 .

Unlike CT, the tomographic image synthesis reconstructs a section with a projection image obtained from a limited angular range. Therefore, there is a residual image of the section located at the adjacent depth, making it difficult to accurately diagnose the section to be viewed.

In order to solve this problem, it is possible to reduce the probability of misdiagnosis by comparing the projected image with the reconstructed cross-sectional image.

FIG. 2A is an explanatory view for explaining a general chest X-ray imaging method, FIG. 2B is an explanatory view for explaining a position of an X-ray generator in a general chest X-ray photographing, And FIG. 3B is an explanatory diagram for explaining the position of the X-ray generator when photographing a digital tomographic image.

As shown in FIG. 2A, in order to eliminate the difference in contrast between the tissue and the bone at the time of general digital radiography, that is, in the normal chest radiography, high-voltage imaging of 120 kVp or more is performed, Ray generator) 30 and the X-ray detector 40 at least 180 cm. That is, the patient 10 is positioned in front of the X-ray detector 40 and the X-ray tube 30 is positioned 180 cm away from the patient. At this time, as shown in FIG. 2B, (Chest PA) images and chest lateral direction images (chest left / right lateral) are acquired. In some cases, the images of the chest lateral direction images can be omitted.

However, as shown in FIG. 3A, when acquiring a digital tomographic image synthesis (Tomo Synthesis) image, that is, a thoracic tomographic image synthesis image, it is necessary to acquire a projection image at angles as wide as possible. ) 30 and the X-ray detector 40 is required to be about 100 cm. At this time, the photographed image is obtained while rotating at a predetermined angle about the center of the chest of the patient 10. Accordingly, as shown in FIG. 3B, images are acquired with low tube voltage and low tube current as a large amount of projection images are captured.

However, normal chest radiography at 110 cm or thoracic tomosynthesis at 180 cm is not possible, indicating that two tests can not be performed at the same site.

The reason for this is that in general chest radiography, a high tube voltage (120 kVp or more) is used to minimize the difference in contrast due to the large density difference between pulmonary and ribs, Thoracic tomosynthesis requires imaging (over 180 cm), while tomography is undergoing reconstruction through several angles. Therefore, the examination is conducted under conditions less than the normal shooting conditions (100 kVp, 100 cm) Because it uses images (60 ~ 80 sheets), it keeps low condition to reduce dose as much as possible.

Thus, in general, the X-ray general radiography and the DTS radiography do not consecutively run the two examinations simultaneously because the radiographic conditions are quite different from each other. In order to integrate these, it is necessary to solve the problem of the positional shift of the X-ray tube and the change of the shooting condition.

 Therefore, since digital X-ray general imaging and digital tomographic imaging are not simultaneously taken at the same time during chest radiography, the dose of patient exposure is higher than that of continuous radiography, and at the same time, it is difficult to make an accurate comparison when comparing a general X-ray image and a tomosynthesis image. In other words, it is difficult to accurately compare the lesion location in two images because the position of the lesion is shifted according to the movement of the patient's photographing posture.

FIG. 4 is an explanatory view for explaining a problem when a digital X-ray general radiographic image and a digital tomographic image composite image are not continuously shot at the same time during chest radiography.

Fig. 4 (a) shows the patient's image at the time of general X-ray imaging, Fig. 4 (b) shows the patient's image of the digital tomographic image synthetic imaging, Occurs. If the patient's posture moves up / down or left / right, the position of the lesion 20 moves accordingly and it is difficult to accurately compare lesion locations in the two images.

However, if these two tests are carried out consecutively, errors in the positioning of the patient can be minimized, so that an accurate comparison of the two images is possible.

In other words, if you are comparing / analyzing by providing both thoracic DTS (tomosynthesis) and normal chest X-ray, it is imperative that you run both tests continuously at the same time.

Accordingly, it is desirable to successively acquire and display a chest X-ray image of a patient, which is a digital X-ray general radiography image having different shooting conditions, and a reconstructed sectional image, which is a digital tomographic image composite image, It is also desirable to output the reconstructed cross-sectional image together with the reconstructed cross-sectional image.

In the prior art, Korean Patent No. 10-0687846 relates to a method and apparatus for reconstructing an X-ray tomographic image, that is, a digital tomographic image synthesis system. However, since Korean Patent No. 10-0687846 discloses only a reconstruction method, it is difficult to acquire a continuous X-ray image and a DTS shot image continuously.

As another prior art, Korean Patent No. 10-1226479 discloses a method of reconstructing a tomographic image of a region of interest on a three-dimensional image using a tomographic image reconstructed after a tomosynthesis reconstruction process and a tomographic image reconstructed tomographic image or a reconstructed tomographic image And a method for determining whether or not the image has been configured. Korean Patent No. 10-1226479 adds tomosynthesis function to CT, but it is difficult to acquire continuous X-ray image and DTS image continuously.

The object of the present invention is to acquire and display a chest X-ray image of a patient, which is a digital X-ray general radiographic image having different photographing conditions, and a reconstructed cross-sectional image, which is a digital tomographic image composite image, And displaying a projected image for each angle when displaying the X-ray image.

Another object to be solved by the present invention is to provide an X-ray image detecting method for detecting a patient's chest X-ray image and transmitting the X-ray image to a server, an image detecting method for moving the X-ray tube horizontally to a predetermined horizontal distance A condition changing step, a projected image detecting step for capturing a projection image by X-ray angle for the patient's chest and transmitting the image to a server, and a reconstructing sectional image detecting step for detecting a reconstructed sectional image using a projection image at an angle And a method for controlling the digital X-ray imaging system.

In order to solve the above problems, a control method of a digital X-ray imaging system of the present invention is characterized in that an X-ray tube is placed behind a back of a patient located in front of an X-ray detector and an image of a patient's chest PA (backward direction) To the server, a chest PA imaging step; After the chest PA imaging step, the control unit changes the imaging condition to horizontally move the X-ray tube so that the distance between the X-ray tube and the X-ray detector is 100 cm. An X-ray tube is rotated by a predetermined angle along a circumference of the patient, and the chest image is acquired by the data acquisition unit and transmitted to the server by angles; And a tomosynthesis image acquisition step of generating a tomosynthesis image by reconstructing an angular chest image acquired at each angular chest radiographing step.

The control method of a digital X-ray imaging system of the present invention further includes a video output step of outputting a chest PA image, a chest radiography image at angles, and a tomosynthesis image through an output unit after the reconstructed image acquisition step .

A laser generator (laser light source) is mounted on the side of the X-ray tube, and a laser detector is mounted on one side of the detector support with the X-ray detector.

The photographing condition changing step further includes an offset size measuring step of measuring an offset size for aligning the X-ray beam center using a laser detector.

The offset magnitude measuring step transmits the laser incident point detected by the laser detector to the data acquiring part server when the center of the laser detector is away from the center of the X-ray detector by k cm, The coordinates of the point on the remote X-ray detector are detected to be the offset size for aligning the X-ray beam center.

In chest PA imaging, the distance between the X-ray tube and the X-ray detector is more than 180 cm.

In the Tomo Synthesized image acquisition step, when the virtual point at which the X-ray reaches the detector is divided by the x-coordinate and the y-coordinate, the server preprocesses the final coordinates of the reconstructed X-ray projection image; A reconstructed image acquiring step of acquiring a reconstructed X-ray projection image using the final coordinates obtained in the preprocessing step; And a post-processing step of correcting the reconstructed X-ray projection image in the reconstructed image acquiring step using an offset size for aligning the X-ray beam center.

The angular chest photographing step includes a first step of acquiring an initial angle photographing image from an X-ray detector when the X-ray tube is at a predetermined initial photographing position; A data acquiring unit acquiring an image for each angle from an X-ray detector when the X-ray tube is at a position rotated by a predetermined angle along the circumference of the patient; Determining whether the X-ray tube is positioned at the final imaging position, and if not, determining whether the X-ray tube is positioned at the final imaging position; And, if the X-ray tube is in the final imaging position in the third step, transmitting the angularly sensed images to the server.

A control method of a digital X-ray imaging system according to the present invention is a method for controlling a digital X-ray imaging system in which a data acquisition unit acquires a left chest image and a right chest image of a patient between a chest PA imaging step and a photographing condition changing step, Further comprising:

According to another aspect of the present invention, there is provided a digital X-ray imaging system for sequentially detecting and outputting a chest PA (backward direction) image, a chest image at an angle, and a Tomo Synthesized image of a patient, And a laser detector is mounted on one side of the detector support with the X-ray detector mounted thereon.

The chest PA (backward direction) image of the patient was taken such that the distance between the X-ray tube and the X-ray detector was 180 cm or more. The angle between the X-ray tube and the X-ray detector was 100 cm , And the offset size for adjusting the X-ray beam center is measured using a laser detector when photographing the chest image at each angle.

According to the control method of the digital X-ray imaging system of the present invention, a chest X-ray image of a patient, which is a digital X-ray general radiography image having different imaging conditions, and a reconstructed section image, which is a digital tomographic image synthesis image, When displaying the reconstructed sectional image, the projection image according to the angle is displayed together.

Conventionally, since the X-ray general radiography and the DTS radiography are different from each other, the two radiographic images are not continuously photographed at the same time. In the present invention, however, the problem of the positional shift of the X- In general, since the position of the patient must be adjusted again when photographing these two images, the patient positions of the general X-ray image and the DTS image are different, And the position of the lesion is shifted according to the movement of the patient's photographing posture, so that it is difficult to accurately compare the position of the lesion in the two images.

According to another aspect of the present invention, there is provided a control method for a digital X-ray imaging system, comprising: detecting an X-ray image of a patient and transmitting the X-ray image to a server; A step of changing an image detection condition to move to a distance, a projection image detection step for capturing a projection image by X-ray angle to a patient's chest and transmitting the image to a server, a step of detecting a reconstructed sectional image using a projection- And a reconstructing sectional image detecting step. The present invention is made more user-friendly and convenient.

As described above, according to the present invention, it is possible to display three types of images together with general chest X-ray, angular chest projection, and chest tomography.

The integrated driving method of digital X-ray general imaging and digital tomographic image synthesis for chest radiography proposed in the present invention can be applied to a specific imaging (general chest radiography, cervical spine radiography, dress bone Directional shooting, etc.).

Further, the present invention can solve the inferior reconstruction disadvantage of tomographic image synthesis by displaying three kinds of general X-ray photographing, angular projection image and reconstructed sectional image which can be obtained as a result of integrated driving, The application of the present invention can activate the spread of the tomographic image synthesis together with the more accurate patient diagnosis, and thus it can be said that the economic and industrial expectation effect is great.

1 is a schematic block diagram of a digital tomographic image synthesis system.
2A is an explanatory view for explaining a general chest X-ray imaging method.
FIG. 2B is an explanatory diagram for explaining the position of the X-ray generator when the chest X-ray is taken. FIG.
3A is an explanatory view for explaining a method of acquiring a digital tomographic image composite image.
FIG. 3B is an explanatory view for explaining the position of the X-ray generator when photographing a digital tomographic image.
FIG. 4 is an explanatory view for explaining a problem when a digital X-ray general radiographic image and a digital tomographic image composite image are not continuously shot at the same time during chest radiography.
FIG. 5 is a schematic diagram for explaining a control method of a digital X-ray imaging system for successively acquiring a digital X-ray general imaging image and a digital tomography composite image in chest radiography of the present invention.
6 shows an X-ray tube 30 in the digital X-ray imaging system of the present invention.
Figure 7 shows a detector support in the digital radiography system of the present invention.
8 is an explanatory view for explaining the offset size setting of the beam center point of the x-ray in the X-ray detector of Fig.
FIG. 9 is a flowchart illustrating a control method of a digital X-ray imaging system for successively acquiring a digital X-ray general imaging image and a digital tomography composite image at the time of chest radiography of the present invention.
10 shows an example of a reconstructed X-ray projection image of a chest PA image, a chest radiograph at angles, and an angle-dependent image.
11 shows an example of a screen of the output unit of the present invention.

Hereinafter, a control method of a digital X-ray imaging system for successively acquiring a digital X-ray general imaging image and a digital tomography composite image at the time of chest radiography according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 5 is a schematic view for explaining a control method of a digital X-ray imaging system for successively acquiring a digital X-ray general imaging image and a digital tomography composite image at the time of chest radiography according to the present invention. FIG. 7 shows the detector support in the digital X-ray imaging system of the present invention, and FIG. 8 shows the offset size setting of the beam center point of the x-ray in the X-ray detector of FIG. Fig.

In the digital X-ray imaging system of the present invention, a laser generator (that is, a laser light source) 35 is mounted on the side surface of the X-ray tube 30, and on one side of the detector support 41 on which the X- And a laser detector 47. In addition, the configuration of the digital X-ray imaging system of the present invention is the same as that of the digital X-ray imaging system of FIG.

6 (a) is a side view of the X-ray tube 30, and FIG. 6 (b) is a front view of the X-ray tube 30. FIG.

As shown in Fig. 8, the center of the X-ray detector 40 and the center of the laser detector 47 are separated by a certain distance, k cm.

The laser detector 47 detects a point at which the laser beam is incident at a point where the intensity of light is higher than a predetermined value because the portion of the point where the laser is incident has a light intensity higher than that of the portion where the laser is incident, 70 and the server 70 receives the laser incidence point 48 and determines the coordinates of a point on the X-ray detector 40 that is away from the laser incidence point 48 by k cm, Ray detector corresponding point 42 and sets it to the offset magnitude of the x-ray beam center point 42. This is achieved by reconstructing a tomographic image in the tomosynthesis scan to generate an x-ray projection image Is used.

That is, in the present invention, a laser generator 37 is mounted on the X-ray tube 30, and a laser detector 47 is mounted on the detector support 41 to perform an X-ray beam center (a normal chest radiography and a tomosynthesis radiography) the beam center is determined and used for reconstruction.

In the present invention, first, an X-ray is irradiated from an X-ray tube 30 for a chest PA examination and an image is detected through an X-ray detector 40. The imaging condition is a high- 30 and the X-ray detector 40 is set to 180 cm or more. The detected chest PA image is transmitted to the server 70, and the server 70 stores the received chest PA image in the memory unit 90.

Thereafter, the X-ray tube 30 is moved to a position for tomosynthesis inspection to change the photographing (inspection) condition and start photographing to acquire an image for each angle. 30) and the X-ray detector 40 is about 100 cm, and the image is acquired with a low tube voltage and a low tube current, and may be a low tube voltage of preferably 100 kVp. The acquired angle-specific images are sent to the server 70, and the server 70 reconstructs the tomosynthesis images from the angles of the received angles.

The server 70 outputs the reconstructed images obtained by reconstructing all three kinds of images, that is, the chest PA image, the angular chest image, and the angular image, through the output unit 80.

FIG. 9 is a flowchart illustrating a control method of a digital X-ray imaging system for successively acquiring a digital X-ray general imaging image and a digital tomography composite image at the time of chest radiography of the present invention.

The patient's chest is adjusted to position the patient in front of the X-ray detector 40 (Patient positioning) (S110) for the chest PA (general radiography) Ray tube 30 is positioned such that the distance between the X-ray tube 30 and the X-ray detector 40 is 180 cm or more while the position of the X-ray tube 30 is positioned behind the back of the patient (Exposure parameter setting) (S130), and an X-ray is generated from the X-ray tube 30 to adjust the chest PA image (S140), and the data acquisition unit 45 transmits the photographed image from the X-ray detector 40 to the server 70 (S150).

The control unit 31 horizontally moves the X-ray tube 30 to move the X-ray tube 30 and the X-ray tube 30 to the X-ray tube 30 in order to move the X-ray tube 30 to the position for the tomosynthesis test, The distance between the detectors 40 is set to be 100 cm (S160), and an offset size for aligning the X-ray beam center, that is, the rotation center in tomosynthesis imaging, The control unit 31 emits the laser from the laser generator 35 (i.e., the laser light source) 35, and outputs the laser light to the laser light source 35. In order to measure the determined offset size, the controller 31 applies a commercially available positioning algorithm, The laser detector 47 detects the laser incident point 48 from the light intensity of the laser and transmits it to the server 70. The server 70 detects an X-ray detector 40 ), That is, the coordinates of the point on the X-ray detector at the laser incidence point The X-ray tube 30 detects the coordinates of the corresponding point 42 and stores it in the memory 90 as an offset size for fitting the X-ray beam center (S170) The position of the X-ray tube 30 is adjusted so as to be located at the initial photographing position of the patient (S180), the exposure parameter is set in the AEC mode (Exposure parameter setting) (S190) The X-ray is exposed and the data acquiring unit 45 acquires the initial angle-by-angle image from the X-ray detector 40 (S200). Then, the data acquiring unit 45 rotates the X- Ray tube 30 is exposed from the X-ray tube 30 to acquire an image for each angle (S210), it is determined whether the X-ray tube 30 is positioned at the final imaging position of the patient (S220) The camera 10 captures an image for each angle at a position rotated by a predetermined angle at S210 If continued, and one end recording position that transfers the specific angle photographed image to the server 70. The

When the virtual point at which the X-ray reaches the detector is divided by the x-coordinate and the y-coordinate in order to reconstruct the tomographic image to generate the x-ray projection image, The reconstructed X-ray projection image is acquired using the obtained final coordinates (S250), and the reconstructed X-ray projection image is converted into an X-ray projection image by performing pre-processing to obtain final coordinates of the projection image (S240) Post-processing for performing correction using an offset size for aligning the beam center (S260), and transmits the reconstructed X-ray projection image to the server 70 (S270).

The server 70 outputs the X-ray projection image (reconstructed image) obtained by reconstructing the chest PA image, the angular chest radiography image, and the angle-based image through the output unit 80 (S280).

In FIG. 9, only the chest PA image is photographed as a digital X-ray general radiographic image, but it is not intended to limit the present invention, and it is of course possible to further photograph the left and right lateral projections.

10 shows an example of a reconstructed X-ray projection image of a chest PA image, a chest radiograph at angles, and an angle-dependent image.

10 (A) is a chest radiography image of a normal chest, (B) is a chest radiography image obtained by an angle, (C) is a tomosynthesis image of a chest, Lt; / RTI >

11 shows an example of a screen of the output unit 80 of the present invention.

11 is a graphical user interface. In FIG. 11, (A) is a normal chest PA imaging image, (B) is a chest imaging image acquired for each angle, (C) This is the tomosynthesis image. 11 (B), the image selection unit 82 for each angle made up of a scroll bar is provided to select an image for each angle according to the scrolling up and down of the scroll bar, B). A depth-based image selection unit 84 provided with a scroll bar on the side of the chest tomosynthesis image of FIG. 11C is provided, and a chest tomosynthesis image for each depth is selected according to the scrolling up and down of the scroll bar, 11 (C).

The control method of the digital X-ray imaging system for collectively and continuously acquiring images of digital X-ray general imaging and digital tomographic image synthesis of the chest of the present invention has the following advantages.

Since the patient's position is fixed and general imaging and tomosynthesis are performed, images can be compared without distortion in the images.

Tomo Synthesis provides low depth resolution compared to CT because it reconstructs images taken at a limited angle. However, when comparing three images of normal thoracic PA images, chest radiographs obtained by angle, and thorax tomosynthesis images, Can be overcome.

In addition, the accuracy of the diagnosis can be further improved by adding the left and right lateral projections to the five images.

In the integrated drive of general X-ray device and Tomo Synthesis, there is no case of mechanical movement of chest tomosynthesis considering the specificity of general chest X-ray. Angular chest projection, and chest tomosynthesis are required, and such cases have not been found in the past.

The integrated driving of digital X-ray general radiography and digital tomosynthesis for chest radiography proposed in the present invention is characterized by the use of a specific imaging (general chest radiography, cervical bone lateral radiography, dressing bone direction Shooting, etc.).

In addition, it can compensate for the inaccurate reconfiguration shortcomings of Tomo Synthesis by displaying three types of general X-ray photographs, angular projection images, and reconstructed sectional images that can be obtained as a result of integrated driving together.

Therefore, when the present invention is applied to the medical market, it is possible to activate the dissemination of Tomo Synthesis in addition to more accurate diagnosis of the patient, so that the economic and industrial expectancy effect is great.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Modification is possible. Accordingly, it is intended that the scope of the invention be defined by the claims appended hereto, and that all equivalent or equivalent variations thereof fall within the scope of the present invention.

30: X-ray tube 31:
35, 37: laser generator 40: X-ray detector
41: detector support 42: X-ray detector corresponding point
42: beam center point 45: data acquisition unit
47: laser detector 48: laser incident point
70: server 80: output section
82: angle-specific image selection unit 84: depth-dependent image selection unit
90:

Claims (14)

A chest PA imaging step in which an X-ray tube is positioned behind a back of a patient located in front of an X-ray detector, and a data acquiring unit acquires an image of a patient's chest PA (backward direction)
After the chest PA imaging step, the control unit changes the imaging condition to horizontally move the X-ray tube so that the distance between the X-ray tube and the X-ray detector is 100 cm.
An X-ray tube is rotated by a predetermined angle along a circumference of the patient, and the chest image is acquired by the data acquisition unit and transmitted to the server by angles;
A method for controlling a digital X-ray imaging system, comprising: a tomosynthesis image acquiring step of reconstructing a tomosynthesis image by reconstructing an angular chest image acquired at an angle chest radiographing step,
A laser generator (laser light source) is mounted on the side of the X-ray tube,
A laser detector is mounted on one side of the detector support with the X-ray detector,
The photographing condition changing step may further include an offset size measuring step of measuring an offset size for aligning the X-ray beam center using a laser detector,
The offset magnitude measuring step transmits the laser incident point detected by the laser detector to the data acquiring part server when the center of the laser detector is away from the center of the X-ray detector by k cm, Detecting the coordinates of a point on the X-ray detector at a distance to obtain an offset size for aligning the X-ray beam center. The method according to claim 1,
After the Tomo Synthesized image acquisition step, the server outputs a chest PA image, a chest radiograph at angles, and a tomosynthesis image through an output unit;
And a control unit for controlling the digital X-ray imaging system. delete delete delete The method according to claim 1,
Wherein the distance between the X-ray tube and the X-ray detector in the chest PA imaging step is 180 cm or more. The method according to claim 1, wherein the step of acquiring a tomosynthesis image comprises:
When the x-ray reaches the detector and the virtual point is divided by the x-coordinate and the y-coordinate, the server preprocesses the final coordinate of the reconstructed x-ray projection image;
A reconstructed image acquiring step of acquiring a reconstructed X-ray projection image using the final coordinates obtained in the preprocessing step;
A post-processing step of performing correction using an offset size for aligning the reconstructed X-ray projection image in the reconstructed image acquisition step with the X-ray beam center;
And a controller for controlling the X-ray imaging system. 2. The method according to claim 1,
When the X-ray tube is at the predetermined initial photographing position, the data obtaining unit obtains the photographing image of the initial angle from the X-ray detector;
A data acquiring unit acquiring an image for each angle from an X-ray detector when the X-ray tube is at a position rotated by a predetermined angle along the circumference of the patient;
Determining whether the X-ray tube is positioned at the final imaging position, and if not, determining whether the X-ray tube is positioned at the final imaging position;
A fourth step of, if the X-ray tube is in the final imaging position in the third step, transmitting images taken by angle to the server;
And a control unit for controlling the digital X-ray imaging system. The method according to claim 1,
A chest side image capturing step of acquiring a left chest image and a right chest image of a patient between a chest PA imaging step and a photographing condition changing step and transmitting the obtained data to the server;
And a control unit for controlling the X-ray imaging system. 1. A digital X-ray imaging system for sequentially detecting and simultaneously outputting a chest PA (backward direction) image, a chest image by angle, and a tomosynthesis image of a patient,
A laser generator (laser light source) is mounted on the side of the X-ray tube,
A laser detector is mounted on one side of the detector support with the X-ray detector,
The angle of offset for aligning the X-ray beam center at the time of angular chest imaging is measured using a laser detector,
Assuming that the center of the laser detector and the center of the X-ray detector are separated by k cm, the data acquisition part sends the detected laser incident point to the data acquisition part server, and the server reads the X- And a coordinate of the point is detected to set an offset size for aligning the X-ray beam center. 11. The method of claim 10,
Wherein the chest PA (backward direction) image of the patient is a photograph taken so that the distance between the X-ray tube and the X-ray detector is 180 cm or more. 12. The method of claim 11,
Wherein the angular chest image is a photograph taken so that the distance between the X-ray tube and the X-ray detector is 100 cm. delete delete

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