JP2012245103A - X-ray diagnostic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an X-ray diagnostic apparatus capable of reducing the work.SOLUTION: The X-ray diagnostic apparatus includes: an X-ray diaphragm 22 which can vary the range of irradiation of X rays from an X-ray tube 21 to be applied to a subject P; an X-ray detector 26 for detecting X rays transmitting the subject P; an image data generating part 61 for generating image data based on a detection signal detected by the X-ray detector 26; a concerned region detection part 62 for extracting a region with movement from image data in a plurality of frames generated by the image data generating part 61 and detecting a concerned region based on the extracted region; and an image data processing part 63 for processing the image data generated by the image data generating part 61 based on the concerned region detected by the concerned region detection part 62. The image data processing part 63 discriminates a position corresponding to the concerned region detected by the concerned region detection part 62 in the image data generated by the image data generating part 61.

Description

  Embodiments described herein relate generally to an X-ray diagnostic apparatus including an X-ray diaphragm that can vary an X-ray irradiation range.

  In recent years, X-ray diagnostic apparatuses have made progress mainly in the field of circulatory organs with the development of angiographic examinations using catheters and IVR (Interventional Radiology). The X-ray diagnostic apparatus movably supports an X-ray irradiation unit that irradiates a subject with X-rays, an X-ray detection unit that detects X-rays transmitted through the subject, and a top plate on which the subject is placed. It has a couch to play. The X-ray irradiation unit includes an X-ray tube that generates X-rays, and an X-ray restrictor that is disposed between the X-ray tube and the subject and that can change the irradiation range of the X-rays irradiated to the subject. I have.

  Incidentally, the X-ray diagnostic apparatus emits X-rays with a small dose, detects X-rays transmitted through the subject by the X-ray detection unit, and displays image data obtained in real time on a monitor. A LIH (Last Image Hold) function is known that stores image data of the last frame in a memory when X-ray irradiation is stopped.

  In addition, after the X-ray irradiation is stopped, the irradiation range is narrowed by an X-ray restrictor in order to avoid unnecessary X-ray exposure to the subject. Then, after limiting the irradiation range to the region of interest of the subject, the image data obtained by X-ray irradiation to the region of interest and the image excluding the region corresponding to the region of interest in the image data stored in the memory before narrowing the irradiation range There is a technique for displaying data on a monitor.

JP 2008-212550 A

  However, since it is necessary to perform operations such as specifying the range of the region of interest for narrowing the irradiation range and operating the X-ray diaphragm, an X-ray diagnostic apparatus that requires various operations during examination and treatment Annoying the operator.

  The embodiment has been made to solve the above-described problems, and an object thereof is to provide an X-ray diagnostic apparatus capable of reducing work.

  In order to solve the above problem, an X-ray diagnostic apparatus according to an embodiment includes an X-ray tube that generates X-rays to be irradiated on a subject, and an irradiation range of X-rays from the X-ray tube that is irradiated to the subject. Based on a variable X-ray diaphragm, an X-ray detector that detects an X-ray irradiated through the X-ray diaphragm and transmitted through the subject, and a detection signal detected by the X-ray detector An image data generation unit that generates image data, and a region of interest extracted from a plurality of frames of image data generated in time series by the image data generation unit, and a region of interest is detected based on the extracted region An area detection unit, an image data processing unit for identifying a position corresponding to the region of interest of the image data generated by the image data generation unit, and a display unit for displaying the image data whose position is identified by the image data processing unit And And said that there were pictures.

The block diagram which shows the structure of the X-ray diagnostic apparatus which concerns on embodiment. The figure which shows an example of a structure of the X-ray restrictor and X-ray detector which concern on embodiment. FIG. 3 is a block diagram showing details of the configuration of the image processing unit according to the embodiment. The flowchart which shows operation | movement of the X-ray diagnostic apparatus which concerns on embodiment. The figure which shows the image data displayed on the display part which concerns on embodiment, an X-ray aperture device, and an X-ray detector. The figure which shows the image data on which the square frame displayed on the display part which concerns on embodiment was superimposed, an X-ray aperture device, and an X-ray detector. The figure which shows the region-of-interest image data, X-ray restrictor, and X-ray detector which were displayed on the display part which concerns on embodiment.

  Hereinafter, embodiments will be described with reference to the drawings.

  FIG. 1 is a block diagram showing the configuration of the X-ray diagnostic apparatus. The X-ray diagnostic apparatus 100 includes a bed unit 10 on which a subject P is movably mounted, an X-ray irradiation unit 20 that irradiates the subject P mounted on the bed unit 10 with X-rays, and an X-ray. An X-ray detection unit 25 that detects X-rays transmitted through the subject P by irradiation from the irradiation unit 20, an arm 30 that holds the X-ray irradiation unit 20 and the X-ray detection unit 25 movably, the bed unit 10 and And a moving mechanism unit 40 that moves and drives the arm 30.

  Further, the X-ray diagnostic apparatus 100 receives image data based on a detection signal detected by the X-ray detection unit 25 and a high-voltage generation unit 50 that generates a high voltage necessary for X-ray irradiation of the X-ray irradiation unit 20. An image processing unit 60 to be generated, a display unit 70 for displaying image data generated by the image processing unit 60, an operation unit 80 for inputting various commands, etc., and a system control unit 90 for controlling each unit described above It has.

  The bed unit 10 includes a top plate 11 on which the subject P is placed, and a top plate support 12 that supports the top plate 11 on which the subject P is placed so as to be movable in the longitudinal direction and the vertical direction. Yes.

  The X-ray irradiation unit 20 includes an X-ray tube 21 that generates X-rays to be irradiated onto the subject P, and an X-ray diaphragm 22 that can vary the irradiation range of X-rays from the X-ray tube 21 that irradiates the subject P. And an aperture control unit 23 for controlling the X-ray aperture 22. The X-ray detector 25 is detected by an X-ray detector 26 and an X-ray detector 26 that detect X-rays that are irradiated through the X-ray diaphragm 22 of the X-ray irradiator 20 and transmitted through the subject P. A signal processing unit 27 for processing the detected signal and generating X-ray projection data is provided.

  The moving mechanism unit 40 includes a top plate moving mechanism 41 that moves the top plate 11 of the bed unit 10 in the longitudinal direction and the vertical direction, an arm moving mechanism 42 that rotates the arm 30, a top plate moving mechanism 41, and an arm moving mechanism. And a mechanism control unit 43 for controlling 42.

  The high voltage generator 50 includes a high voltage generator that supplies a high voltage to the X-ray tube 21 of the X-ray irradiation unit 20 and an X-ray controller that controls the high voltage generator. Then, a high voltage for generating X-rays is supplied to the X-ray tube 21 based on the X-ray irradiation conditions including the tube voltage and tube current supplied from the system control unit 90.

  The image processing unit 60 includes an image data generation unit 61 that generates image data based on X-ray projection data generated by the signal processing unit 27 of the X-ray detection unit 25 by X-ray irradiation to the subject P. . In addition, a region of interest detection unit 62 that extracts a region having motion from the image data of a plurality of frames generated by the image data generation unit 61 and detects a region of interest based on the extracted region is provided. Further, an image data processing unit 63 that performs identification processing and synthesis processing of image data generated by the image data generation unit 61 based on the region of interest detected by the region of interest detection unit 62 is provided.

  The display unit 70 includes a liquid crystal panel or a CRT monitor, and displays the image data generated by the image data generation unit 61 of the image processing unit 60. Also, the image data processed by the image data processing unit 63 of the image processing unit 60 is displayed.

  The operation unit 80 includes input devices such as a keyboard, a trackball, a joystick, a mouse, and a switch. Then, an input for setting X-ray irradiation conditions, an input for starting irradiation for irradiating X-rays, an input for stopping irradiation for stopping X-ray irradiation, and the like are performed.

  The system control unit 90 includes a CPU and a storage circuit, temporarily stores input information input from the operation unit 80, and then, based on the input information, the X-ray irradiation unit 20, the X-ray detection unit 25, and a moving mechanism. The unit 40, the high voltage generation unit 50, and the image processing unit 60 are controlled in an integrated manner.

Next, with reference to FIG.1 and FIG.2, the detail of the structure of the X-ray aperture 22 of the X-ray irradiation part 20 and the X-ray detector 26 of the X-ray detection part 25 is demonstrated.
FIG. 2 is a diagram illustrating an example of the configuration of the X-ray diaphragm 22 and the X-ray detector 26. The X-ray diaphragm 22 includes four diaphragm blades 221 to 224 that form an irradiation port 22a through which X-rays irradiated from the X-ray tube 21 pass, and a blade moving mechanism 225 that moves the two diaphragm blades 221 and 222. And a blade moving mechanism 226 that moves the two diaphragm blades 223 and 224.

  Each diaphragm blade 221 to 224 is made of a material that absorbs X-rays, such as tungsten and molybdenum, and is movable in parallel to the detection surface 26a of the X-ray detector 26 that detects X-rays from the X-ray tube 21. Be placed. The diaphragm blades 221 to 224 form a rectangular irradiation port 22a through which X-rays generated in the X-ray tube 21 pass. The irradiation range of the X-ray irradiated to the subject P is limited by the irradiation port 22a.

  The two diaphragm blades 221 and 222 are arranged in parallel so that the end surfaces forming one end of the irradiation port 22a face each other. The two diaphragm blades 223 and 224 arranged perpendicular to the diaphragm blades 221 and 222 are arranged in parallel so that the end surfaces forming the other ends of the irradiation port 22a face each other.

  The blade moving mechanism 225 moves the diaphragm blades 221 and 222 in the arrow L4 direction and the arrow L5 direction opposite to the L4 direction. Further, the blade moving mechanism 226 moves the diaphragm blades 223 and 224 in the arrow L6 direction and the arrow L7 direction opposite to the L6 direction.

  The diaphragm control unit 23 is supplied from the system control unit 90 with a distance D1 between the X-ray tube 21 and the X-ray detector 26, a distance D2 between the X-ray tube 21 and the X-ray diaphragm 22, and an X-ray detection. The blade moving mechanisms 225 and 226 are controlled based on the information on the vertical length and the horizontal length of the detection surface 26a of the detector 26. Then, the diaphragm blades 221 to 224 are moved so that the incident range of the X-rays irradiated from the X-ray tube 21 is included in the detection surface 26 a of the X-ray detector 26.

Next, details of the configuration of the image processing unit 60 will be described with reference to FIGS. 1 to 3.
FIG. 3 is a block diagram showing details of the configuration of the image processing unit 60. The image data generation unit 61 of the image processing unit 60 generates image data at a preset frame rate from X-ray projection data generated by the X-ray detection unit 25 by, for example, low-dose fluoroscopic X-ray irradiation. The generated image data is output to the region of interest detection unit 62 and the display unit 70 for each frame.

  The region of interest detection unit 62 includes a difference accumulation unit 621, a region extraction unit 622, and a region determination unit 623. Then, the difference accumulating unit 621 sequentially obtains the difference image data by taking the difference between the pixel values of the pixels at the same position between the image data of two frames adjacent in time series generated by the image data generating unit 61. Generate. Next, the generated difference image data is accumulated in the order of generation, and one accumulated difference image data (first accumulated difference image data is obtained by adding pixel values of pixels at the same position in the accumulated difference image data including a predetermined number. ) Is generated. Next, the second cumulative difference image data is generated in the same manner as in the case of the first cumulative difference image data following the first cumulative difference image data.

  The region extraction unit 622 extracts a first region having motion from the first cumulative difference image data generated by the difference accumulation unit 621, and extracts a second region having motion from the second cumulative difference image data. To do. Here, from the first cumulative difference image data, a rectangular area (first area) that is the shape of the irradiation port 22a of the X-ray diaphragm 22 that surrounds a pixel having a pixel value equal to or greater than a preset threshold value. Extract. Further, a quadrangular region (second region) surrounding pixels having pixel values equal to or greater than the threshold is extracted from the second cumulative difference image data. Then, the first position data indicating the position of the first area and the second position data indicating the position of the second area are output to the area determination unit 623.

  The region determination unit 623 determines whether the first and second regions are regions of interest based on the first and second position data from the region extraction unit 622. If the difference between the positions of the first area and the second area is within a preset allowable range, it is determined that the first and second areas are areas of interest. For example, the second position data is The data is output to the image data processing unit 63 and the system control unit 90. If the difference between the positions of the first area and the second area is out of the allowable range, it is determined that the first and second areas are not the region of interest, and the determination result is output to the system control unit 90. To do.

  The difference accumulation unit 621 sequentially generates difference image data, accumulates the difference image data in the order of generation, and adds the pixel values of the pixels at the same position in the accumulated difference image data including the latest predetermined number, thereby adding the latest accumulated difference. Generate image data. Then, the region extraction unit 622 calculates the center of gravity of the latest cumulative difference image data based on the pixel values of the pixels distributed throughout the latest cumulative difference image data. Then, a square area surrounding the pixels in which the sum of the pixel values centering on the obtained center of gravity is a predetermined ratio such as 80% with respect to the sum of the pixel values of the entire latest cumulative difference image data is extracted, or Extract the rectangular area with the smallest area among the rectangles surrounding the pixels whose pixel value is a predetermined ratio with respect to the total of the pixel values of the entire latest cumulative difference image data with the calculated center of gravity as the center, You may implement so that the extracted area | region may be detected as a region of interest. Thereby, the area | region which is moving continuously or the area | region where a position changes a lot can be detected as a region of interest.

  The image data processing unit 63 performs identification processing on the position corresponding to the region of interest of the image data generated by the image data generation unit 61 based on the second position data output from the region determination unit 623 of the region of interest detection unit 62. . Here, a rectangular frame indicating the position of a quadrangle surrounding the region of interest is superimposed on a plurality of frames of image data generated by the image data generation unit 61 over a predetermined time from when the second position data is obtained. To do. Then, the image data on which the square frame is superimposed is output to the display unit 70 for each frame.

  Further, the image data processing unit 63 stores, for example, one frame of still image data generated by the image data generation unit 61 in response to an approval input for approving the region of interest from the operation unit 80 in an internal memory. Then, the irradiation range is narrowed by the X-ray diaphragm 22 in accordance with the approval input, and time-series at a frame rate set in advance by X-ray irradiation toward the detection range of the X-ray detector 26 corresponding to the region of interest. The first image data of each frame generated in the above and the second image data obtained by removing the data of the position of the region of interest from the still image data stored in the internal memory before the irradiation range is narrowed by the X-ray restrictor 22 To generate region-of-interest image data. Then, the generated region-of-interest image data is output to the display unit 70.

Hereinafter, an example of the operation of the X-ray diagnostic apparatus 100 will be described with reference to FIGS. 1 to 7.
FIG. 4 is a flowchart showing the operation of the X-ray diagnostic apparatus 100. The subject P is placed on the top plate 11 of the bed unit 10, and the top plate 11 is moved to a position where X-ray irradiation can be performed on a portion including the region of interest of the subject P. For example, in the subject P Treatment is performed by inserting a catheter. When an input for setting each diaphragm blade 221 to 224 of the X-ray diaphragm 22 of the X-ray irradiation unit 20 to the home position is performed from the operation unit 80, the X-ray diagnostic apparatus 100 starts operation (step S1).

  The system control unit 90 instructs the X-ray irradiation unit 20, the X-ray detection unit 25, the movement mechanism unit 40, the high voltage generation unit 50, and the image processing unit 60 to perform inspection. Then, the diaphragm control unit 23 of the X-ray irradiation unit 20 controls the blade moving mechanisms 225 and 226 of the X-ray diaphragm 22 to move each diaphragm blade 221 to 224 to the home position.

  Next, when irradiation start is input from the operation unit 80, the high voltage generation unit 50 supplies a high voltage to the X-ray tube 21. The X-ray irradiation unit 20 irradiates the subject P on the top plate 11 with X-rays. The X-ray detection unit 25 detects X-rays transmitted through the subject P and generates X-ray projection data.

  The image data generation unit 61 of the image processing unit 60 generates image data at a preset frame rate based on the X-ray projection data generated by the X-ray detection unit 25. The generated image data is output to the region of interest detection unit 62 and the display unit 70 for each frame. The display unit 70 displays the image data generated by the image data generation unit 61 in real time.

  FIG. 5 is a diagram illustrating the image data, the X-ray diaphragm 22 and the X-ray detector 26 displayed on the display unit 70. 5A shows an example of the image data displayed on the display unit 70, and FIG. 5B shows the X-ray restrictor 22 when the image data of FIG. 5A is displayed in real time. And an X-ray detector 26. The image data 71 is image data generated when, for example, X-ray irradiation is performed toward the entire detection surface 26a of the X-ray detector 26, and includes data of the region of interest P1 of the subject P. .

  The difference accumulation unit 621 of the region-of-interest detection unit 62 generates first and second accumulated difference image data based on the image data of a plurality of frames generated by the image data generation unit 61 (Step S2 in FIG. 4). .

  The region extraction unit 622 extracts the first and second regions from the first and second cumulative difference image data generated by the difference accumulation unit 621, and indicates the positions of the extracted first and second regions. The first and second position data are output to the area determination unit 623 (step S3 in FIG. 4).

  The region determination unit 623 determines whether the first region and the second region are regions of interest based on the first and second position data from the region extraction unit 622. If the difference between the positions of the first area and the second area is within a preset allowable range (Yes in step S4 in FIG. 4), it is determined that the first and second areas are regions of interest. Then, the second position data is output to the image data processing unit 63 and the system control unit 90. Thereafter, the process proceeds to step S5.

  If the difference in position between the first region and the second region is out of the allowable range (No in step S4 in FIG. 4), it is determined that the first and second regions are not regions of interest, The determination result is output to the system control unit 90. Thereafter, the process returns to step S2.

  The image data processing unit 63 is a quadrangle surrounding the detected region of interest on a plurality of frames of image data generated by the image data generation unit 61 over a predetermined time from when the second position data is obtained. A square frame indicating the position of is superimposed (step S5 in FIG. 4).

  The display unit 70 displays in real time the image data on which the rectangular frame output from the image data processing unit 63 is output for each frame.

  FIG. 6 is a diagram showing the image data on which the square frame displayed on the display unit 70 is superimposed, the X-ray diaphragm 22 and the X-ray detector 26. FIG. 6A shows an example of image data on which the rectangular frame displayed on the display unit 70 is superimposed, and FIG. 6B shows the case where the image data of FIG. 6A is displayed in real time. The X-ray restrictor 22 and the X-ray detector 26 are shown.

  This image data 71a is data generated when X-ray irradiation is performed toward the entire detection surface 26a of the X-ray detector 26, and catheter data indicating the distal end portion of the catheter inserted into the subject P. 71a1 is included. A square frame 72 surrounding the region of interest 71a2 including the catheter data 71a1 that moves due to the operation of the catheter is superimposed on the image data 71a.

  Here, the position and size of the square frame 72 displayed on the display unit 70 with respect to the image data 71 a can be changed by input from the operation unit 80. In this case, the input device of the operation unit 80 is operated to display the cursor on the display unit 70 and move to the position of the square frame 72, and the square frame 72 is enlarged, reduced, and moved on the image data 71a. Can be changed. Further, a sample that is a candidate when the square frame 72 is enlarged, reduced, or moved can be displayed on the display unit 70, and can be changed by selecting the sample.

  In addition, while displaying the image data 71a and the square frame 72 on the display part 70, X-ray irradiation toward the detection range of the X-ray detector 26 corresponding to the region of interest 71a2 is possible, or region-of-interest image data You may implement so that the message and icon which notify that it is possible to generate | occur | produce can be displayed.

  In this way, the region of interest 71a2 can be detected based on a plurality of frames of image data generated in time series by the image data generation unit 61. Then, a square frame 72 indicating the position of the region of interest 71a2 can be superimposed on the image data 71a displayed on the display unit 70. Thereby, the operation of designating the region of interest 71a2 can be reduced. Further, the work time can be shortened by reducing the work.

  Next, when an input for approving the region of interest 71a2 is performed from the operation unit 80 within a predetermined time after the image data 71a and the square frame 72 are displayed on the display unit 70, the image data processing unit 63 receives the approval input. For example, one frame of still image data generated by the image data generation unit 61 when the image data is generated is stored in the internal memory.

  The aperture control unit 23 controls the wing moving mechanisms 225 and 226 of the X-ray aperture device 22 based on the second position data supplied from the system control unit 90 to move the aperture blade 221 in the L4 direction and stop the aperture. The blade 222 is moved in the L5 direction. Further, the diaphragm blade 223 is moved in the L6 direction and the diaphragm blade 224 is moved in the L7 direction. Then, the irradiation range is narrowed so that the X-ray irradiation is performed toward the detection range 26a1 that is narrower than the detection surface 26a of the X-ray detector 26 corresponding to the region of interest 71a2.

  The image data processing unit 63 has first image data generated at a preset frame rate by X-ray irradiation toward the detection range 26 a 1 of the X-ray detector 26, and the irradiation range by the X-ray diaphragm 22. The region-of-interest image data is generated by combining with the second image data obtained by removing the region data in the rectangular frame 72 from the still image data generated before being narrowed down and output to the display unit 70 (step of FIG. 4). S6).

  FIG. 7 is a diagram showing the region-of-interest image data, the X-ray diaphragm 22 and the X-ray detector 26 displayed on the display unit 70. 7A shows an example of the region-of-interest image data displayed on the display unit 70, and FIG. 7B shows the X-ray aperture when the region-of-interest image data in FIG. 7A is displayed. The device 22 and the X-ray detector 26 are shown.

  This region-of-interest image data 73 is image data having the same size as the image data 71a in FIG. 6A, and the first image data 74 displayed in real time in the square frame 72 shown in FIG. 6A. And second image data 75 displayed stationary outside the rectangular frame 72.

  The first image data 74 is image data generated when X-ray irradiation is performed toward the detection range 26a1 of the X-ray detector 26, and includes catheter data 741 that is moved by the operation of the catheter. . The second image data 75 is image data from which the data in the area within the square frame 72 of the still image data stored in the image data processing unit 63 in accordance with the approval input from the operation unit 80 is removed.

  In this way, the X-ray restrictor 22 sets the irradiation range so that X-ray irradiation is performed toward the detection range 26a1 of the X-ray detector 26 corresponding to the region of interest 71a2 by the input for approving the region of interest 71a2 from the operation unit 80. Can be narrowed down to. Thereby, the operation of operating the X-ray diaphragm 22 can be reduced. Further, the work time can be shortened by reducing the work.

  In step S5, if an input for approving the region of interest 71a2 is not made from the operation unit 80 within a predetermined time after the image data 71a and the square frame 72 are displayed on the display unit 70, the process returns to step S2.

  When the irradiation stop is input from the operation unit 80, the system control unit 90 performs inspection on the X-ray irradiation unit 20, the X-ray detection unit 25, the moving mechanism unit 40, the high voltage generation unit 50, and the image processing unit 60. By instructing the end, the X-ray diagnostic apparatus 100 ends the operation (step S7 in FIG. 4).

  According to the embodiment described above, a region with motion is extracted based on a plurality of frames of image data generated in time series by the image data generation unit 61, and a region of interest 71a2 is detected based on the extracted region. be able to. Then, a square frame 72 indicating the position of the detected region of interest 71a2 can be superimposed on the image data 71a displayed on the display unit 70.

  Thereby, the operation of designating the region of interest 71a2 can be reduced. Further, since the operation time can be shortened by reducing the number of operations, the exposure of the subject P can be reduced.

  In addition, by the input for approving the region of interest 71a2 from the operation unit 80, the irradiation range is narrowed down to the X-ray diaphragm 22 so that X-ray irradiation is performed toward the detection range 26a1 of the X-ray detector 26 corresponding to the region of interest 71a2. Can be made. Thereby, the operation of operating the X-ray diaphragm 22 can be reduced. Moreover, since the operation time can be shortened by reducing the operation, the exposure of the subject P can be reduced.

  Although several embodiments of the present invention have been described, these embodiments are 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 changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

20 X-ray irradiation unit 21 X-ray tube 22 X-ray diaphragm 23 Aperture control unit 60 Image processing unit 61 Image data generation unit 62 Region of interest detection unit 63 Image data processing unit 70 Display unit 90 System control unit 621 Difference accumulation unit 622 region Extraction unit 623 area determination unit

Claims (6)

An X-ray tube for generating X-rays for irradiating the subject;
An X-ray diaphragm that can vary the irradiation range of X-rays from the X-ray tube that irradiates the subject;
An X-ray detector for detecting X-rays irradiated through the X-ray diaphragm and transmitted through the subject;
An image data generation unit that generates image data based on a detection signal detected by the X-ray detector;
A region of interest detection unit that extracts a region of motion from a plurality of frames of image data generated in time series by the image data generation unit, and detects a region of interest based on the extracted region;
An image data processing unit for identifying a position corresponding to the region of interest of the image data generated by the image data generation unit;
An X-ray diagnostic apparatus comprising: a display unit that displays image data whose position is identified by the image data processing unit.   The image data processing unit is generated by X-ray irradiation toward the detection range of the X-ray detector corresponding to the region of interest after the irradiation range is narrowed by the X-ray diaphragm based on the region of interest. The region-of-interest image data is synthesized by combining the first image data and the second image data obtained by removing the region-of-interest data from the still image data generated before the irradiation range is narrowed by the X-ray restrictor. The X-ray diagnostic apparatus according to claim 1, wherein:   The region-of-interest detection unit has motion from a predetermined number of frames of image data generated in time series by the image data generation unit and a predetermined number of frames of image data generated after the image data is generated. When first and second areas having a predetermined shape surrounding a pixel having a pixel value are extracted, and the difference between the position of the first area and the position of the second area falls within a preset allowable range The X-ray diagnostic apparatus according to claim 1, wherein the first region or the second region is detected as a region of interest. The region of interest detection unit includes a difference accumulation unit and a region extraction unit,
The difference accumulation unit sequentially generates and accumulates difference image data by taking a difference between the image data of two adjacent frames in time series generated by the image data generation unit, and the latest plurality of accumulated The latest cumulative difference image data is generated by adding difference image data consisting of a predetermined number of
The region extraction unit obtains a centroid of the latest cumulative difference image data based on a pixel value of each pixel distributed over the latest cumulative difference image data, and a sum of pixel values centered on the obtained centroid is the latest 2. A region having a predetermined shape surrounding pixels having a predetermined ratio with respect to a total of pixel values of the total accumulated difference image data is extracted, and the extracted region is detected as a region of interest. The X-ray diagnostic apparatus described.   5. The display unit displays a message notifying that X-ray irradiation toward a detection range of the X-ray detector corresponding to the region of interest is possible. An X-ray diagnostic apparatus according to any one of the above.   The X-ray according to claim 3 or 4, wherein the predetermined shape is a shape of an irradiation port through which X-rays from the X-ray tube that can be formed by the X-ray restrictor pass. Diagnostic device.

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