JP7223517B2 - Medical diagnostic imaging equipment - Google Patents

Description

An embodiment of the present invention relates to a medical imaging diagnostic apparatus.

Preprocessing such as sensitivity correction processing is applied to imaging data obtained by imaging with an X-ray CT (Computed Tomography) device or the like, and all data are stored in a database. Then, a three-dimensional image such as a tomographic image is generated by reconstructing the stored imaging data.

Incidentally, in X-ray CT or the like, intermittent scanning may be performed in which X-ray imaging is performed by switching ON/OFF of X-ray irradiation. At this time, the acquired imaging data includes imaging data that is not used clinically, such as X-ray irradiation OFF data. In this case, when reconstructing from the imaging data, in order to extract the data when the X-ray irradiation is off from all the imaging data, it is automatically detected by software, or the tomographic image is reconstructed by the user. Since it is necessary to determine the data when the X-ray irradiation is OFF, such as determination from , the workflow of image generation is complicated.

JP 2003-116841 A

The problem to be solved by the present invention is to save only clinically necessary data, reduce the data storage area, and improve the workflow of image generation.

A medical image diagnostic apparatus according to an embodiment includes an acquisition unit, a state detection unit, and a selection storage unit. The acquisition unit acquires a plurality of imaging data obtained by irradiating the subject with X-rays. The state detection unit detects a change in the internal state of the captured data based on the acquired captured data. The selection storage unit stores clinically necessary imaging data when a change in the internal state is detected.

1 is a configuration diagram showing the configuration of an X-ray CT according to an embodiment; FIG. FIG. 2 is a block diagram showing the configuration of a processing circuit in the X-ray CT according to the embodiment; FIG. 3 is a graph showing an example of changes in the correlation value of raw data between before and after imaging views when X-ray irradiation is switched from OFF to ON. FIG. 4 is an explanatory diagram for explaining correlation of raw data in front and rear photographing views; FIG. 5 is a flow chart showing the flow of determining whether or not raw data is necessary based on changes in the correlation value of the raw data in the preceding and following photographing views. FIG. 6 is an explanatory diagram for explaining correlation of raw data in front and back imaging views when a puncture needle is inserted; FIG. 7 is a configuration diagram showing an example of an arrangement of reference detectors; FIG. 8 is a graph showing an example of change in output value of a reference detector when X-ray irradiation is switched from OFF to ON; FIG. 9 is a flow chart showing the flow of determining whether or not raw data is necessary based on changes in the output value of a reference detector.

A medical image diagnostic apparatus according to an embodiment will be described below with reference to the accompanying drawings. Here, the medical image diagnostic apparatus will be described using an X-ray CT apparatus, which is an example of the medical image diagnostic apparatus.

As shown in FIG. 1, the X-ray CT apparatus 1 according to the embodiment has a gantry device 10, a bed device 30, and a console device 40. As shown in FIG. In FIG. 1, a plurality of gantry devices 10 are drawn in order to explain the positional relationship of the subject P to be inserted into the gantry device 10 .

In this embodiment, the rotation axis of the rotating frame 13 in the non-tilt state or the longitudinal direction of the top plate 33 of the bed apparatus 30 is the Z-axis direction, and the axial direction perpendicular to the Z-axis direction and horizontal to the floor surface is are defined as the X-axis direction, the axis direction perpendicular to the Z-axis direction, and the Y-axis direction as the axis direction perpendicular to the floor surface.

The gantry device 10 has an X-ray tube 11 , an X-ray detector 12 , a rotating frame 13 and an X-ray high voltage device 14 .

The X-ray tube 11 is a vacuum tube that generates X-rays by applying a high voltage from an X-ray high-voltage device 14 and irradiating thermal electrons from a cathode (filament) toward an anode (target).

Wedge 16 is a filter for adjusting the dose of X-rays emitted from X-ray tube 11 . Specifically, the wedge 16 transmits and attenuates the X-rays irradiated from the X-ray tube 11 so that the X-rays irradiated from the X-ray tube 11 to the subject P have a predetermined distribution. It is a filter that For example, the wedge 16 (wedge filter, bow-tie filter) is a filter processed from aluminum to have a predetermined target angle and a predetermined thickness.

The collimator 17 is a lead plate or the like for narrowing down the irradiation range of the X-rays transmitted through the wedge 16, and a slit is formed by combining a plurality of lead plates or the like. Note that the collimator 17 may also be called an X-ray diaphragm.

The X-ray detector 12 detects X-rays emitted from the X-ray tube 11 and passing through the subject P, and outputs an electrical signal corresponding to the X-ray dose to the DAS 18 . The X-ray detector 12 has, for example, a plurality of X-ray detection element arrays in which a plurality of X-ray detection elements are arranged in the channel direction along one circular arc around the focal point of the X-ray tube. The X-ray detector 12 has, for example, a structure in which a plurality of X-ray detection element arrays each having a plurality of X-ray detection elements arranged in the channel direction are arranged in the slice direction (column direction, row direction). A reference detector provided at the end of the X-ray detector 12 will be described later.

The X-ray detector 12 is mounted inside the bed device 30 and arranged at a position facing the X-ray tube 11 . The X-ray detector 12 is composed of, for example, a flat panel detector (FPD), detects X-rays irradiated to the X-ray detector 12, and generates an X-ray fluoroscopic image based on the detected X-rays. or an X-ray photographed image is output. The captured image data detected by the X-ray detector 12 is transferred to the console device 40 . Note that the X-ray detector 12 may be configured using an image intensifier, a TV camera, or the like.

Also, the X-ray detector 12 is, for example, an indirect conversion type detector having a grid, a scintillator array, and a photosensor array. The scintillator array has a plurality of scintillators, and each scintillator has a scintillator crystal that outputs a photon amount of light corresponding to the amount of incident X-rays. The grid has an X-ray shielding plate arranged on the surface of the scintillator array on the X-ray incident side and having a function of absorbing scattered X-rays. Note that the grid may also be called a collimator (one-dimensional collimator or two-dimensional collimator).

The photosensor array has a function of converting the amount of light from the scintillator into an electrical signal, and includes photosensors such as photomultiplier tubes (PMTs). The X-ray detector 12 may be a direct conversion type detector having a semiconductor element that converts incident X-rays into electrical signals.

The X-ray high-voltage device 14 has an electric circuit such as a transformer and a rectifier, and has a high-voltage generator function to generate a high voltage to be applied to the X-ray tube 11. and an X-ray control device for controlling an output voltage according to the X-rays. The high voltage generator may be of a transformer type or an inverter type. Note that the X-ray high-voltage device 14 may be provided on a rotating frame 13 to be described later, or may be provided on a fixed frame (not shown) side of the gantry device 10 . Note that the fixed frame is a frame that rotatably supports the rotating frame 13 .

The DAS 18 (Data Acquisition System) includes an amplifier that amplifies electrical signals output from each X-ray detection element of the X-ray detector 12, and an A/D converter that converts the electrical signals into digital signals. and a data collection unit that generates detection data. The detection data generated by the DAS 18 is transferred to the console device 40 as collected data.

The rotating frame 13 is an annular frame that supports the X-ray tube 11 and the X-ray detector 12 so as to face each other and rotates the X-ray tube 11 and the X-ray detector 12 by means of a control device 15, which will be described later. In addition to the X-ray tube 11 and the X-ray detector 12, the rotating frame 13 further includes an X-ray high-voltage device 14 and a DAS 18 to support them. The detection data generated by the DAS 18 is transmitted from a transmitter having a light-emitting diode (LED) provided on a rotating frame to a non-rotating portion of the gantry (for example, a fixed frame, not shown in FIG. 1) by optical communication. .), and is forwarded to the console device 40, which has a photodiode. The method of transmitting the detected data from the rotating frame to the non-rotating portion of the gantry is not limited to the optical communication described above, and any method of non-contact data transmission may be employed.

The control device 15 has a processing circuit having a CPU, etc., and a driving mechanism such as a motor and an actuator. The control device 15 has a function of receiving an input signal from an input interface 43 (described later) attached to the console device 40 or the gantry device 10 and controlling the operations of the gantry device 10 and the bed device 30 .

For example, the control device 15 receives an input signal and performs control to rotate the rotating frame 13 , control to tilt the gantry device 10 , and control to operate the bed device 30 and the tabletop 33 . Note that the control for tilting the gantry device 10 is performed by the control device 15 based on the tilt angle (tilt angle) information input through the input interface attached to the gantry device 10, so as to rotate the rotating frame 13 about an axis parallel to the X-axis direction. This is achieved by rotating the Note that the control device 15 may be provided in the gantry device 10 or may be provided in the console device 40 .

The bed device 30 is a device for placing and moving a subject P to be scanned, and includes a base 31 , a bed driving device 32 , a top board 33 and a support frame 34 . The base 31 is a housing that supports the support frame 34 so as to be vertically movable. The bed driving device 32 is a motor or actuator that moves the table 33 on which the subject P is placed in the longitudinal direction of the table 33 . A top plate 33 provided on the upper surface of the support frame 34 is a plate on which the subject P is placed. Note that the bed driving device 32 may move the support frame 34 in the longitudinal direction of the top plate 33 in addition to the top plate 33 .

The console device 40 has a memory 41 , a display 42 and an input interface 43 . Although the console device 40 is described as being separate from the gantry device 10 , the console device 40 or a part of each component of the console device 40 may be included in the gantry device 10 .

The memory 41 is implemented by, for example, a RAM (Random Access Memory), a semiconductor memory device such as a flash memory, a hard disk, an optical disk, or the like. The memory 41 functions as a database that stores projection data and reconstructed image data, for example.

The display 42 displays various information. For example, the display 42 outputs a medical image (CT image) generated by the processing circuit 44, a GUI (Graphical User Interface) for accepting various operations from the operator, and the like. For example, the display 42 is a liquid crystal display or a CRT (Cathode Ray Tube) display. Also, the display 42 may be provided on the gantry device 10 . The display 42 may be of a desktop type, or may be configured by a tablet terminal or the like capable of wireless communication with the main body of the console device 40 .

The input interface 43 receives various input operations from the operator, converts the received input operations into electrical signals, and outputs the electrical signals to the processing circuit 44 . For example, the input interface 43 receives acquisition conditions for acquiring projection data, reconstruction conditions for reconstructing CT images, image processing conditions for generating post-processed images from CT images, and the like from the operator. . For example, the input interface 43 is implemented by a mouse, keyboard, trackball, switch, button, joystick, or the like. Also, the input interface 43 may be provided in the gantry device 10 . Also, the input interface 43 may be composed of a tablet terminal or the like capable of wireless communication with the main body of the console device 40 .

FIG. 2 is a block diagram showing the configuration of the processing circuit 44. As shown in FIG. The processing circuit 44 is a processor that controls the overall operation of the X-ray CT apparatus 1 by reading and executing programs stored in the memory 41 . Here, as an example, a case where the processing circuit 44 realizes various functions by software processing by a processor will be described, but the processing circuit 44 can also be configured by dedicated hardware such as ASIC.

For example, the processing circuit 44 has a system control function 441 , a data acquisition function 442 , a preprocessing function 443 , a state detection function 444 , a selection storage function 445 and a reconstruction processing function 446 .

The system control function 441 controls various functions of the processing circuit 44 based on input operations received from the operator via the input interface 43 . Here, a case of performing X-ray imaging by intermittently switching ON/OFF of X-ray irradiation in the process of continuously changing the imaging view (imaging view) indicating the irradiation angle of the X-ray tube 11 is examined. do.

The data acquisition function 442 acquires a plurality of imaging data obtained by irradiating the subject with X-rays. A data acquisition function 442 acquires information such as a view number, an imaging angle, and an imaging time corresponding to each imaging view together with collected data transmitted from the DAS.

The preprocessing function 443 generates correction data by performing preprocessing such as logarithmic conversion processing, offset correction processing, inter-channel sensitivity correction processing, and beam hardening correction on the collected data transmitted from the DAS 18 .

Collected data output from the data collection circuit is hereinafter referred to as "pure raw data", and data obtained by performing preprocessing such as logarithmic conversion processing and offset correction processing on the pure raw data is referred to as "raw data". Data before preprocessing (pure raw data) and data after preprocessing (raw data) are collectively referred to as projection data.

The state detection function 444 detects changes in the internal state of collected data based on the acquired collected data. The state detection function 444 calculates the correlation value of the collected data (raw data) in the previous and subsequent shooting views, and detects changes in the internal state of the collected data based on the correlation value and the set first threshold.

Specifically, the state detection function 444 acquires the raw data of the acquired shooting view and the raw data of the immediately preceding shooting view, compares the raw data before and after, and obtains the correlation value. When the X-ray exposure is OFF, the raw data in the before and after imaging views show low correlation values. On the other hand, when the X-ray irradiation is ON, the raw data in the before and after imaging views show a high correlation value because the object exists at a fixed position within the data.

Therefore, when the correlation value of the raw data in the preceding and succeeding imaging views changes to exceed the set first threshold value, it can be determined that the X-ray irradiation has been switched from OFF to ON. Conversely, when the correlation value changes below the first threshold, it can be determined that the X-ray irradiation has been switched from ON to OFF. Note that the first threshold is set in advance in consideration of scanning conditions such as a correlation value and rotation speed that are shown when ON/OFF of X-ray irradiation is switched.

When the state detection function 444 detects a change in the internal state, the selection storage function 445 saves the acquired data when the X-ray is ON based on the correlation value of the raw data in the previous and subsequent imaging views. Save in memory 41 . Specifically, if a change in the internal state is detected and the correlation value exceeds the first threshold, the sorting and storing function 445 stores the raw data corresponding to the imaging view that was collected when the X-ray irradiation was ON. It is stored in the memory 41 as data. On the other hand, if the correlation value is equal to or less than the first threshold, it is not stored in the memory 41 as raw data collected when the X-ray irradiation is OFF.

The reconstruction processing function 446 performs reconstruction processing using the filtered back projection method, the iterative reconstruction method, or the like on the raw data selected and stored by the selection storage function 445 when X-ray irradiation is ON. to generate CT image data. Based on the input operation received from the operator via the input interface 43, the generated CT image data is converted into tomographic image data or three-dimensional image data of an arbitrary cross section by a known method.

FIG. 3 is a graph showing an example of changes in the correlation value of raw data in the before and after imaging views when X-ray irradiation is switched from OFF to ON when X-ray imaging is performed by changing the imaging views. FIG. 4 is a diagram for explaining the correlation of raw data in the imaging views before and after the X-ray irradiation is switched from OFF to ON.

FIG. 3 shows correlation values from 2300 views to 3700 views when X-ray imaging is performed by switching ON/OFF of X-ray irradiation.

As shown in FIG. 4, the correlation value is low between the 2488 view in which the X-ray irradiation was turned off and the 2489 view in which the X-ray irradiation was turned on. has a high correlation and the correlation value exceeds the set threshold.

The state detection function 444 detects that the X-ray irradiation has been switched from OFF to ON when the correlation value exceeds the threshold. Then, the sorting and saving function 445 saves in the memory 41 the raw data corresponding to the shooting views whose correlation values exceed the threshold.

On the other hand, the state detection function 444 detects that the X-ray irradiation has been switched from ON to OFF when the correlation value changes below the threshold. Then, the selection storage function 445 does not store in the memory 41 the raw data corresponding to the shooting views whose correlation values are equal to or less than the threshold.

By repeating this process until the scan is completed, only the raw data corresponding to when the X-ray irradiation is ON, that is, only the raw data necessary for reconstruction is stored in the memory 41 .

When the reconstruction processing function 446 reconstructs the raw data stored in the memory 41, the captured views of the stored raw data may be discontinuous. In this case, the view numbers of the recorded shooting views are used, and if the view numbers are not consecutive, the reconstruction is not executed across the shooting views.

FIG. 5 is a flow chart showing the flow of determining the necessity of raw data based on the change in the correlation value of the raw data in the previous and subsequent shooting views (see FIG. 2 as necessary).

State detection function 444 sets a first threshold for comparison with raw data correlation values in the previous and subsequent views (S10). The first threshold is set in advance in consideration of scanning conditions such as a correlation value and rotation speed that are shown when ON/OFF of X-ray irradiation is switched.

The controller 15 starts CT scanning (S11). The X-ray tube 11 is placed at the position of the initial imaging view and X-ray irradiation is performed. Data acquisition function 442 collects pure raw data corresponding to the shot view from DAS 18 (S12).

The preprocessing function 443 performs preprocessing to generate raw data (S13). The state detection function 444 then calculates the correlation value of the raw data in the previous and subsequent views (S14).

When the calculated correlation value exceeds the threshold, the state detection function 444 detects that the X-ray irradiation has been switched from OFF to ON, and the sorting and saving function 445 corresponds to the imaging view whose correlation value exceeds the threshold. The raw data to be processed is stored in the memory 41 (S15: YES, S16). On the other hand, if the correlation value is equal to or less than the threshold, raw data is not saved (S15: NO).

If the current imaging view is smaller than the number of imaging views to be collected, the control device 15 moves the X-ray tube 11 to the next imaging view and continues the raw data storage processing (S17: YES, S18). On the other hand, if the number of views for which the current imaging views are to be collected is the number of views to be collected, the X-ray imaging is ended (S17: NO, end).

In this way, of raw data acquired during X-ray imaging, only clinically necessary raw data (raw data when X-ray irradiation is ON) is saved, and clinically unnecessary raw data is not saved. This eliminates the need to refer to unnecessary raw data when reconstructing from raw data, improving the workflow of image generation and reducing the data area for storing raw data.

In the above embodiment, changes in the internal state of the raw data are detected based on the correlation values of the raw data in the previous and subsequent shooting views. may be used to calculate correlation values to detect changes in the internal state of the data. As a result, when it is determined not to store unnecessary data in the memory 41, there is no need to perform preprocessing on the pure raw data, and the processing process can be shortened.

Furthermore, image data reconstructed based on raw data obtained from a plurality of imaging views may be used when calculating the correlation value. In this case, reconstructed data is generated from a plurality of raw data in a shooting view of an arbitrarily specified range, and reconstruction data is generated by reconstructing from a plurality of raw data in a shooting view of a range different from the specified range. do. Then, the correlation value of the two image data is calculated, and if the correlation value exceeds the reference value, it is determined that there is correlation, and the raw data acquired from the multiple photographing views is stored. On the other hand, if the correlation value is less than the reference value, it is determined that there is no correlation, and the raw data acquired from the multiple shooting views is not saved. In this way, the correlation between the image data that has been reconstructed images is calculated, and based on the correlation value, it is determined whether or not to store all the raw data that contributed to the creation of the image.

Further, when performing X-ray imaging in the case of inserting a puncture needle for surgery, whether or not to store raw data may be determined using the correlation value of raw data.

Specifically, the state detection function 444 calculates the correlation value between the raw data of the acquired imaging view and the raw data of the immediately preceding imaging view for the raw data acquired during X-ray imaging, and calculates the correlation value A change in the internal state of the raw data due to the insertion of the puncture needle is detected based on . Then, the selection storage function 445 stores only the raw data when the puncture needle is inserted in the memory 41 based on the correlation value when a change in the internal state is detected.

FIG. 6 is an explanatory diagram for explaining the correlation of raw data in the front and rear imaging views when the puncture needle is inserted. Note that when obtaining the correlation value of raw data, raw data acquired in the same shooting view may be compared.

As shown in FIG. 6, the raw data before insertion of the puncture needle and the raw data after insertion of the puncture needle show a low correlation value, while the raw data after insertion of the puncture needle have a high correlation with each other. Therefore, insertion of the puncture needle can be detected from the correlation value, and only raw data at the time of insertion of the puncture needle, which is clinically necessary, can be stored in the memory 41 .

Further, when X-ray imaging is performed with a contrast agent flowing into the subject, the correlation value of the raw data may be used to determine whether or not to store the raw data.

Specifically, the state detection function 444 calculates the correlation value between the raw data of the acquired imaging view and the raw data of the immediately preceding imaging view for the raw data acquired during X-ray imaging, and calculates the correlation value A change in the internal state of the raw data due to the inflow of the contrast agent is detected based on . Then, the selection storage function 445 stores raw data when the contrast agent is infused based on the correlation value when a change in the internal state is detected. As a result, the inflow of the contrast medium can be detected from the correlation values in the raw data before and after it, and only the raw data at the inflow of the contrast medium that is clinically necessary can be stored in the memory 41 .

(Second embodiment)
In the second embodiment, changes in the internal state of imaging data are detected based on the output value of the reference detector 20 provided in the X-ray detector 12 .

FIG. 7 is a configuration diagram showing an example of arrangement of the reference detector 20. As shown in FIG. The reference detectors 20 are provided at both ends of the X-ray detector 12 and detect X-rays that arrive without passing through the subject.

The state detection function 444 detects changes in the internal state of the collected data based on the output value of the reference detector 20 and the second threshold. The second threshold is set in advance in consideration of the output value of the reference detector 20 and the scanning conditions such as the rotation speed when the X-ray irradiation is switched between ON and OFF.

The selection storage function 445 stores the collected data when the X-ray irradiation is ON based on the output value when a change in the internal state is detected. Specifically, when the output value of the reference detector 20 exceeds the second threshold, raw data corresponding to the imaging view is stored in the memory 41 as raw data collected when X-ray irradiation is ON. On the other hand, when the output value of the reference detector 20 is equal to or less than the second threshold value, it is not stored in the memory 41 as raw data collected when the X-ray irradiation is OFF.

FIG. 8 is a graph showing an example of changes in the output value of the reference detector 20 when X-ray irradiation is switched from OFF to ON.

FIG. 8 shows output values of the reference detector 20 in each imaging view when X-ray imaging is performed by switching ON/OFF of X-ray irradiation. As shown in FIG. 8, the reference detector 20 exhibits a high output value above the threshold when the X-ray exposure is switched ON. Therefore, changes in the internal state of the imaging data can be detected from the output value of the reference detector 20, and only the raw data corresponding to the ON state of the X-ray irradiation, that is, the raw data necessary for reconstruction can be stored in the memory 41.

FIG. 9 is a flow chart for judging the necessity of raw data based on changes in the output value of the reference detector 20 (see FIGS. 2 and 7 as needed).

The state detection function 444 sets a second threshold for comparison with the output value of the reference detector 20 (S20).

The controller 15 starts CT scanning (S21). The X-ray tube 11 is placed at the position of the initial imaging view and X-ray irradiation is performed. Data acquisition function 442 collects pure raw data corresponding to the shot view from DAS 18 (S22).

The state detection function 444 acquires the output value of the reference detector 20 in the shooting view (S23). The preprocessing function 443 performs preprocessing to generate raw data (S24).

When the output value of the reference detector 20 exceeds the second threshold, the state detection function 444 detects that the X-ray irradiation has been switched from OFF to ON, and the selection storage function 445 stores the correlation value as the threshold. , is stored in the memory 41 (S25: YES, S26). On the other hand, when the output value of the reference detector 20 is equal to or less than the threshold value, the raw data are not saved (S25: NO).

If the current imaging view is smaller than the number of imaging views to be collected, the control device 15 moves the X-ray tube 11 to the next imaging view and continues the raw data storage processing (S27: YES, S28). On the other hand, when the number of views for which the current imaging views are to be collected is the number of views to be collected, the X-ray imaging is ended (S27: NO, end).

In this way, of raw data acquired during X-ray imaging, only clinically necessary raw data is saved, and clinically unnecessary raw data is not saved. This eliminates the need to refer to unnecessary raw data when reconstructing from raw data, improving the workflow of image generation and reducing the data area for storing raw data.

According to at least one embodiment described above, only clinically necessary data can be stored, the data storage area can be reduced, and the image generation workflow can be improved.

Note that the system control function 441 is an example of a system control unit. The data acquisition function 442 is an example of an acquisition unit. The preprocessing function 443 is an example of a preprocessing unit. The state detection function 444 is an example of a state detection unit. The sorted save function 445 is an example of a sorted saver. The reconstruction processing function 446 is an example of a reconstruction processing unit.

Further, in the above embodiment, the term "processor" is, for example, a dedicated or general-purpose CPU (Central Processing Unit), a GPU (Graphics Processing Unit), or an application specific integrated circuit (ASIC), Circuits such as programmable logic devices (eg, Simple Programmable Logic Devices (SPLDs), Complex Programmable Logic Devices (CPLDs), and FPGAs) shall be meant. The processor implements various functions by reading and executing programs stored in the storage medium.

Further, in the above embodiments, an example of a case where a single processor of the processing circuit realizes each function is shown, but a processing circuit is configured by combining a plurality of independent processors, and each processor realizes each function. good too. Further, when a plurality of processors are provided, a storage medium for storing programs may be provided individually for each processor, or a single storage medium may collectively store programs corresponding to the functions of all processors. good too.

While several embodiments of the invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, as well as the scope of the invention described in the claims and equivalents thereof.

1 X-ray CT device 11 X-ray tube 12 X-ray detector 20 Reference detector 40 Console device 41 Memory 42 Display 43 Input interface 44 Processing circuit 441 System control function 442 Data acquisition function 443 Preprocessing function 444 State detection function 445 Selective storage Function 446 reconstruction processing function

Claims (6)

an acquisition unit that acquires a plurality of imaging data obtained by irradiating an object with X-rays;
a state detection unit that detects a change in an internal state of the photographed data based on the acquired photographed data;
a selection storage unit that stores the imaging data clinically necessary when a change in the internal state is detected;
with
When X-ray imaging is performed in a plurality of imaging views by rotating the X-ray tube and the X-ray detector, the state detection unit calculates a correlation value of the imaging data in the preceding and following imaging views, and sets the correlation value. Detecting a change in the internal state of the photographed data based on the first threshold value,
The selection storage unit stores the imaging data when X-ray irradiation is ON based on the correlation value when a change in the internal state is detected.
Medical diagnostic imaging equipment. an acquisition unit that acquires a plurality of imaging data obtained by irradiating an object with X-rays;
a state detection unit that detects a change in an internal state of the photographed data based on the acquired photographed data;
a selection storage unit that stores the imaging data clinically necessary when a change in the internal state is detected;
with
When a puncture needle is inserted into the subject and X-ray imaging is performed, the state detection unit calculates a correlation value of the preceding and following imaging data, and based on the correlation value, the imaging data obtained by inserting the puncture needle. detecting a change in the internal state of
The selection storage unit stores the imaging data at the time of insertion of the puncture needle based on the correlation value when a change in the internal state is detected.
Medical diagnostic imaging equipment. an acquisition unit that acquires a plurality of imaging data obtained by irradiating an object with X-rays;
a state detection unit that detects a change in an internal state of the photographed data based on the acquired photographed data;
a selection storage unit that stores the imaging data clinically necessary when a change in the internal state is detected;
with
The state detection unit calculates a correlation value of the preceding and subsequent imaging data when X-ray imaging is performed with a contrast agent flowing into the subject, and based on the correlation value, the imaging with the inflow of the contrast agent is performed. detecting a change in the internal state of data;
The selection storage unit stores the imaging data when the contrast medium is introduced based on the correlation value when the change in the internal state is detected.
Medical diagnostic imaging equipment. an acquisition unit that acquires a plurality of imaging data obtained by irradiating an object with X-rays;
a state detection unit that detects a change in an internal state of the photographed data based on the acquired photographed data;
a selection storage unit that stores the imaging data clinically necessary when a change in the internal state is detected;
with
The state detection unit is provided in an X-ray detector, and uses a reference detector that detects X-rays to determine the internal state of the imaging data based on the output value of the reference detector and a second threshold value. detect changes,
The selection storage unit stores the imaging data when X-ray irradiation is ON based on the output value when a change in the internal state is detected.
Medical diagnostic imaging equipment. When performing X-ray imaging in a plurality of imaging views by rotating the X-ray tube and X-ray detector,
the imaging data is projection data or image data;
The medical image diagnostic apparatus according to any one of claims 1 to 4. When performing X-ray imaging in a plurality of imaging views by rotating the X-ray tube and X-ray detector,
The imaging data is data before preprocessing is executed,
The medical image diagnostic apparatus according to any one of claims 1 to 5.

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