JP2016034300A - Image diagnostic device and imaging method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image diagnostic device that enables a positioning operation in long-length imaging to be efficiently performed with a simple device configuration, and an imaging method.SOLUTION: In long-length imaging, an image processing unit 14 displays a camera image 71 taken with a video camera 2 on a display unit 15, and superimposes an X-ray image 74 obtained by the last X-ray exposure upon a corresponding position on the camera image 71. The image processing unit 14 further superimposes a virtual marker 75 indicating the position of a marker 5 at the last X-ray exposure upon the camera image 71 and X-ray image 74. Namely, the image processing unit 14 creates a synthetic image 72 in which the camera image 71 taken with the video camera 2, the X-ray image 74, and the virtual marker 75 are superimposed upon one another for synthesis, and displays it on the display unit 15.SELECTED DRAWING: Figure 8

Description

  The present invention relates to an image diagnostic apparatus and an imaging method, and more particularly to a technique for performing positioning during long imaging.

  2. Description of the Related Art Conventionally, X-ray image diagnostic apparatuses that perform film imaging using a long cassette are known for long imaging performed in an X-ray image diagnostic apparatus or the like. An X-ray image taken by this type of X-ray diagnostic imaging apparatus is baked on a film and stored in the form of a film. In recent years, an X-ray diagnostic imaging apparatus equipped with an X-ray detector such as an FPD (Flat Panel Detector) and an image processing apparatus for imaging and storing transmitted X-ray data detected by the X-ray detector in place of the above-described cassette. Is being used.

  In long imaging using the above-mentioned FPD in a general X-ray diagnostic imaging apparatus, the target part is imaged in several times, and the image (digital data) obtained by imaging is combined into a single image for a long time. Get a scale image. Therefore, it is necessary for the operator to perform positioning work a plurality of times. In positioning for long shooting, a subject and a scale serving as a guide for the joint position are simultaneously shot, and correction is performed by referring to the value of the scale after shooting a plurality of times, as described in Patent Document 1, A method in which a position sensor (linear encoder, rotary encoder, etc.) for detecting position information of the X-ray detector is incorporated in the apparatus, and the image processing apparatus determines the joining position of the imaging data by acquiring the value at the time of imaging Etc. are used.

JP 2010-233906 A

  However, the above-described conventional method is a complicated procedure because it is necessary to photograph the subject and the scale at the same time for positioning. Further, when a sensor for detecting the position of the X-ray detector is used, it is necessary to incorporate the sensor in the apparatus, which may increase the cost.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an image diagnostic apparatus and an imaging method capable of efficiently performing a positioning operation during long imaging with a simple apparatus configuration. Is to provide.

  In order to achieve the above-described object, the first invention includes an X-ray source that irradiates a subject with X-rays, an X-ray detector that detects X-rays transmitted through the subject, the X-ray detector and the subject. An X-ray based on the detected X-ray; a camera that can be imaged by the camera; a marker that indicates the position of the X-ray detector; a storage unit that stores the position of the marker at the time of X-ray exposure; A virtual marker indicating the position of the marker when the image is created, the video captured by the camera is captured, the X-ray image is superimposed on the corresponding position on the video, and the X-ray image is captured. An image diagnostic apparatus comprising: an image processing unit that creates a superimposed composite video; and a display unit that displays the composite video.

  According to a second aspect of the invention, an X-ray source irradiates a subject with X-rays, an X-ray detector detects X-rays transmitted through the subject, and a camera detects the X-ray detector and the subject. An image processing unit that captures an X-ray image based on the detected X-ray, a step of storing the position at the time of X-ray exposure of a marker that can be imaged by the camera and that indicates the position of the X-ray detector; The image captured by the camera is captured, the X-ray image is superimposed on the corresponding position on the image, and a virtual marker indicating the position of the marker when the X-ray image is captured is superimposed And a step of displaying the synthesized video and a step of displaying the synthesized video.

  According to the present invention, it is possible to provide an image diagnostic apparatus and a photographing method capable of efficiently performing a positioning operation during long photographing with a simple device configuration.

1 is an overall configuration diagram of a diagnostic imaging apparatus 1 according to the present invention. External view of X-ray detector 13 and marker 5 External view of X-ray detector 13a and marker 5a Diagram explaining long shooting The flowchart which shows the procedure of the imaging | photography process of this invention Example of operation screen before the first exposure Example of operation screen after first exposure Example of operation screen during second sheet positioning Example of operation screen when positioning of second sheet is completed Example of operation screen after second exposure Another example of the position of the virtual marker 75 Example of markers 5 and 5b having the same contour shape and different colors or patterns

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, the overall configuration of the diagnostic imaging apparatus 1 will be described with reference to FIG.
The diagnostic imaging apparatus 1 according to the present invention is a general X-ray imaging apparatus that shoots an X-ray image that is a still image by irradiating a subject 3 with X-rays. In the following description, an X-ray imaging apparatus that shoots a subject on a bed top plate as an example of the image diagnostic apparatus 1 according to the present invention will be described. For example, as used in chest medical examinations, The present invention can also be applied to an X-ray imaging apparatus that images a subject in a standing position.

  As shown in FIG. 1, the diagnostic imaging apparatus 1 includes an X-ray source including a high voltage generation unit 11 and an X-ray tube 12, and an X-ray detector 13 disposed so as to face the X-ray tube 12 via a subject 3. An image processing unit 14 that acquires an electrical signal (digital data) corresponding to the intensity of transmitted X-rays detected by the X-ray detector 13 and creates an X-ray image based on the acquired electrical signal; and an image processing unit 14, a display unit 15 that displays an image and various types of information created by 14, an operation unit 16 that inputs an operation to the diagnostic imaging apparatus 1, a control unit 17 that controls each part of the diagnostic imaging apparatus 1, and an X-ray exposure instruction , A top plate 4 on which the subject 3 is placed, and a video camera 2 that captures the subject 3 and the X-ray detector 13. The video camera 2 is preferably installed at a position where the entire top plate 4, that is, the movable range of the X-ray detector 13 can be photographed.

  The X-ray source includes an X-ray tube 12 and a high voltage generator 11, and receives a power supply from the high voltage generator 11 to generate a predetermined dose of X-rays from the X-ray tube 12. The operation of the X-ray source is controlled according to the X-ray control signal transmitted from the control unit 17. The X-ray source is provided with an X-ray diaphragm. The X-ray diaphragm has a plurality of X-ray shielding plates, and X-ray irradiation corresponding to the position of the X-ray detector 13 is performed by moving the plurality of X-ray shielding plates according to a control signal from the control unit 17. Regions are formed (see FIG. 4).

  The X-ray detector 13 is a flat panel detector (FPD) in which X-ray detection elements configured by, for example, a combination of a scintillator and a photodiode are two-dimensionally arranged in the channel direction (circumferential direction) and the column direction (body axis direction). , Provided at a position facing the X-ray source via the subject 3. For example, the X-ray detector 13 is installed on the lower surface of the top plate 4. A rail for housing the X-ray detector 13 is provided on the lower surface of the top plate 4, and the X-ray detector 13 can be manually slid along the rail. Thereby, the X-ray detector 13 can be arrange | positioned in a desired target site | part. In the following description, the moving direction of the X-ray detector 13 is the longitudinal direction of the top 4, but it may be the width direction. The X-ray detector 13 detects transmitted X-rays emitted from the X-ray tube 12 and transmitted through the subject 3, and outputs an electrical signal corresponding to the X-ray intensity to the image processing unit 14 as transmitted X-ray data.

  The diagnostic imaging apparatus 1 according to the present invention is provided with a marker 5 that indicates the position of the X-ray detector 13. The marker 5 may have any color, shape, and material as long as it can be recognized and photographed by the video camera 2. The marker 5 may be provided on the X-ray detector 13 itself, or may be provided in conjunction with the movement of the X-ray detector 13. A plurality of markers 5 are provided so as to indicate at least the positions of both end portions in the moving direction of the X-ray detector 13. For example, when the X-ray detector 13 is moved in the body axis direction of the subject 3, the marker 5 is provided at a position indicating the upper end and a position indicating the lower end of the X-ray detector 13 in the body axis direction.

  As shown in FIG. 2, if the markers 5 are provided at the four corners of the frame of the X-ray detector 13, the X-ray detector 13 can be arranged vertically or horizontally. The marker 5 will be arrange | positioned in the position which shows an upper end and a lower end. Moreover, you may make it provide the marker 5a in the position which extended the upper side and lower side of the frame like the X-ray detector 13a shown in FIG. In this case, even when the width of the subject 3 is large, the marker 5a can be photographed by the video camera 2 without overlapping the subject 3.

  Since the X-ray detector 13 is installed on the lower surface of the top plate 4, the surface of the top plate 4 is transparent. This is because the video camera 2 photographs the markers 5 and 5a through the top plate 4. Moreover, if the top plate 4 is transparent, the operator can easily recognize the position of the X-ray detector 13 during positioning.

  In addition, there are those in which the X-ray detector 13 is covered with a cover, such as an X-ray diagnostic apparatus for chest radiography, in which an object is imaged in a standing position. In this case, the marker 5 may be provided on the cover so that the video camera 2 can shoot.

The control unit 17 is a CPU (Central
The computer includes a processing unit (ROM), a read only memory (ROM), a random access memory (RAM), a storage device such as a hard disk, and the like. The control unit 17 controls the X-ray exposure operation based on the input signal input from the operation unit 16 or the switch 18, creates an image in the image processing unit 14, displays the display unit 15, and the video camera 2. The imaging operation is controlled.

  The image processing unit 14 acquires transmission X-ray data from the X-ray detector 13. The image processing unit 14 generates an X-ray image of the subject 3 from the acquired transmission X-ray data. The image processing unit 14 creates a long image by connecting a plurality of X-ray images captured at a plurality of imaging positions.

  In shooting (long shooting) for obtaining a long image, the image processing unit 14 takes in a video imaged by the video camera 2 (hereinafter referred to as camera video 71), and displays the captured camera video 71 on the display unit 15. At the same time, the X-ray image 74 obtained by the previous X-ray exposure is superimposed on the corresponding position on the camera video 71. Further, the image processing unit 14 superimposes a virtual marker 75 indicating the position of the marker 5 at the previous X-ray exposure on the camera video 71 and the X-ray image 74 described above. That is, the image processing unit 14 creates a composite video 72 obtained by synthesizing the camera video 71, the X-ray image 74, and the virtual marker 75 by the video camera 2, and displays the composite video 72 on the display unit 15 (see FIGS. 7 to 9). Details of creation and display of the composite video 72 will be described later.

  Transmission X-ray data obtained by imaging, an X-ray image generated by the image processing unit 14, and a long image are stored in the storage unit of the control unit 17. In addition, the storage unit stores in advance a program related to a shooting operation, various shooting conditions, a program and data necessary for processing to be described later, and the like.

  The display unit 15 is configured by a CRT, a liquid crystal panel, or the like, and displays an image generated by the image processing unit 14, a composite video, display data input from the control unit 17, and the like.

  The operation unit 16 is an input device such as a keyboard and a mouse, for example, and inputs various instructions and information input by the operator to the control unit 17. The operator performs operations interactively using external devices such as the display unit 15 and the operation unit 16. Note that the operation unit 16 may be a touch panel configured integrally with the display screen of the display unit 15.

  The switch 18 is a switch button operated by the operator when instructing X-ray exposure. When the switch 18 is pressed, the control unit 17 causes X-rays corresponding to preset imaging conditions (tube voltage, tube current, exposure dose [mAs], exposure time [msec], etc. of the X-ray tube 12). Exposure.

  The video camera 2 images the subject 3 and the X-ray detector 13. The video imaged by the video camera 2 is sent to the image processing unit 14 in real time. In the positioning process at the time of long photographing, the image processing unit 14 takes in the video imaged by the video camera 2, combines it with the X-ray image and displays it on the display unit 15.

Next, referring to FIG. 4, a description will be given of long imaging using an FPD (Flat Panel Detector).
In long imaging using FPD, the target part is imaged in multiple times, and the image processing unit 14 acquires transmission X-ray data obtained in each imaging and joins it to one image. For example, in the first imaging, as shown in FIG. 4A, an X-ray detector (FPD) 13 is placed on the chest of the subject 3 and imaging is performed to obtain a first X-ray image. Next, as shown in FIG. 4B, the operator moves the X-ray detector (FPD) 13 to the lower abdomen of the subject 3 and performs the second imaging to obtain the second X-ray image. . The image processing unit 14 joins X-ray images (transmission X-ray data) obtained by each photographing. As a result, a long image with the imaging range from the chest to the abdomen is created.

  The operator performs the positioning operation of the X-ray detector 13 before pressing the X-ray exposure switch 18. While performing this positioning operation, the image processing unit 14 shows the image 71 of the video camera 2, the X-ray image 74 obtained by the previous X-ray exposure, and the position of the marker 5 at the previous X-ray exposure. The virtual marker 75 is combined and displayed on the display unit 15. The operator refers to the synthesized image 72 displayed on the display unit 15 to check the position of the previous (first) X-ray detector 13 with the virtual marker 75 and detect the current (second) X-ray. The position of the device 13 can be confirmed and a positioning operation can be performed.

Next, with reference to FIGS. 5 to 10, the photographing process executed by the image processing unit 14 will be described. It is assumed that imaging conditions are set at the start of imaging processing, and imaging preparations such as installation of the X-ray detector 13 and adjustment of the X-ray aperture are completed.
When the long order is selected from various shooting orders via the operation unit 16 (step S101), the image processing unit 14 first starts capturing the camera video 71 from the video camera 2 (step S102). The image processing unit 14 displays the captured camera video 71 on the display unit 15 (step S103).

FIG. 6 is a diagram showing an example of the operation screen 7 before the first imaging (X-ray exposure).
The operator moves the X-ray detector 13 while referring to the camera image 71 displayed on the operation screen 7 of the display unit 15 to perform a positioning operation (step S104).
On the operation screen 7, a camera image 71 captured by the video camera 2 is displayed. The camera image 71 is a moving image, and at least the subject 3, the X-ray detector 13, and the marker 5 are projected in real time.

  After the positioning of the X-ray detector 13 is completed, when the switch 18 is operated and X-ray exposure is instructed, the control unit 17 emits X-rays from the X-ray tube 12. The X-ray detector 13 detects the transmitted X-rays that have passed through the subject 3, converts the detected X-rays into an electrical signal corresponding to the detected X-ray dose, and sends it to the image processing unit 14 as transmitted X-ray data (step S 105).

  The image processing unit 14 generates an X-ray image 74 based on the transmitted X-ray data acquired from the X-ray detector 5 and stores it in the storage unit of the control unit 17. Further, the position of the marker 5 at the time of X-ray exposure is detected from the camera image 71, and the position information is stored in the storage unit of the control unit 17 (step S106).

  Furthermore, the image processing unit 14 displays an X-ray image 74 obtained by the previous X-ray exposure and a virtual marker 75 indicating the position of the marker 5 at the time of imaging in Step S105 (at the previous X-ray exposure) as the current camera image. A composite image 72 superimposed on 71 is created. The image processing unit 14 displays the created composite video 72 on the display unit 15 (step S107).

  FIG. 7 is a diagram showing a display example of the composite image 72 immediately after the first X-ray exposure. As shown in FIG. 7, an X-ray image 74 obtained in the first X-ray exposure is superimposed on a corresponding position on the camera video 71. A virtual marker 75 is superimposed on the marker position at the first X-ray exposure.

  In this way, the operator performs a positioning operation for shooting the second image in a state where the composite video 72 is displayed on the operation screen 7 (step S108). During the positioning operation, the composite image 72 is displayed on the display unit 16 in real time. FIG. 8 shows an example of the operation screen 7 during the positioning operation.

  As shown in FIG. 8, an X-ray image 74 and a virtual marker 75 obtained by the first X-ray exposure are displayed at corresponding positions on the current camera image 71. A state in which the position of the X-ray detector 13 is moved by the positioning is displayed.

  Note that the virtual marker 75 may be displayed only on the moving direction side while the X-ray detector 13 is moving. That is, the image processing unit 14 detects the moving direction of the X-ray detector 13 during the positioning operation (the moving direction of the marker 5) from the camera video 71. The virtual marker 75 is displayed only at the marker position arranged on the moving direction side among the upper and lower marker positions at the time of the previous X-ray exposure. In the example of FIG. 8, since the X-ray detector 13 is moved downward, the virtual marker 75 is displayed only at the marker position on the lower end side during the previous X-ray exposure.

  In the positioning operation, as shown in FIG. 9, the operator can set the position of the current marker 5 (marker indicating the position of the end portion that is not the moving direction of the X-ray detector 13) to overlap the position of the virtual marker 75. The position of the line detector 5 is moved (step S108).

The image processing unit 14 monitors the camera image 71 during the positioning operation, and the marker 5 indicating the position of the end portion that is not the moving direction of the X-ray detector 13 is the moving direction among the marker positions at the previous X-ray exposure. It is determined whether or not it overlaps the position of the virtual marker 75 on the side (step S109; Yes).
That is, when the X-ray detector 13 is moved downward, the position of the marker 5 at the end (that is, the upper end) that is not in the moving direction is the position of the lower virtual marker 75 at the previous X-ray exposure. It is determined whether or not they match.

  As shown in FIG. 9, when the position of the marker 5 attached to the end portion that is not in the moving direction matches the virtual marker 75 in the moving direction (step S109; Yes), the image processing unit 14 displays in the operation screen 7. It is desirable to display a notification 82 (“exposure OK” or the like) indicating that the exposure is possible (step S110).

  In the determination in step S109, when the position of the marker 5 attached in the direction that is not the moving direction does not match the virtual marker 75 in the moving direction (step S109; No), the image processing unit 14 sends the determination result to the control unit 17. The control unit 17 desirably performs control so as to prohibit the X-ray exposure (step S111).

  Further, during positioning, the image processing unit 14 may compare the camera video immediately after the previous X-ray exposure with the current camera video to determine whether or not the position of the subject is shifted. When it is determined that the position of the subject is deviated compared to the previous time, the determination result is notified to the control unit 17, and the control unit 17 notifies the subject to be deviated or does not perform X-ray exposure. You may do it.

  When positioning is completed and the operator operates the switch 18 to instruct X-ray exposure (step S112; Yes), the controller 17 causes the X-ray tube 12 to emit X-rays. The X-ray detector 13 detects the transmitted X-ray transmitted through the subject 3 and sends it to the image processing unit 14 as transmitted X-ray data (step S105).

  After the second X-ray exposure, the image processing unit 14 creates an X-ray image from the transmitted X-ray data acquired from the X-ray detector 5, and further, an X-ray image created by the previous X-ray exposure. And a long image 76 is created and stored in the storage unit of the control unit 17. Further, the position of the marker 5 at the time of the second X-ray exposure is stored in the storage unit (step S106).

  The image processing unit 14 creates a composite video in which the created long image 76 is superimposed on the corresponding position of the camera video 71 and displays it on the display unit 15 (step S107).

  FIG. 10 is a diagram showing a display example of the composite image 72 immediately after the second X-ray exposure. As shown in FIG. 10, a long image 76 obtained by joining the X-ray images obtained by the first and second X-ray exposures is superimposed on a corresponding position on the camera video 71.

  Further, when the shooting is continued, that is, when the image processing unit 14 monitors the camera image 71 and the movement of the position of the marker 5 is detected, the image processing unit 14 detects the marker at the previous (second) shooting. The virtual marker 75 indicating the position is displayed so as to overlap the above-described synthesized video 72 (step S107). Thereafter, the processing from step S107 to step S112 (positioning, marker position determination, notification, shooting, long image creation / display processing) is repeatedly executed (step S108 to step S112).

  When the end of shooting is instructed (step S113; Yes), the image processing unit 14 ends the long shooting.

As described above, the diagnostic imaging apparatus 1 is provided with the marker 5 indicating the position of the X-ray detector 13 and the video camera 2, and the position of the marker 5 (X-ray detector 13) during long imaging is determined by the video camera. Take a picture at 2. When the X-rays are exposed, the image processing unit 14 creates an X-ray image based on the X-ray signal detected by the X-ray detector 13, captures the camera video, and corresponds the X-ray image on the camera video. A composite image 72 is created and displayed by superimposing a virtual marker 75 superimposed on the position and indicating the position of the marker 5 at the previous X-ray exposure.
The operator can simultaneously confirm the virtual marker 75 (marker position at the previous X-ray exposure) in the synthesized image 72 and the current position of the marker 5, and can perform the positioning work efficiently.

  In the above-described embodiment, the marker 5 is provided at least at each position (that is, the upper end portion and the lower end portion) indicating both ends of the X-ray detector 13 in the moving direction. The virtual marker is displayed at the marker position at the time of the radiation exposure. This is based on the assumption that the image processing unit 14 matches two X-ray images when creating a long image. That is, the image processing unit 14 creates the long image 76 by simply joining the two X-ray images without considering the boundary (joint).

  On the other hand, when creating a long image 76, when a part of two X-ray images is overlapped and joined together like a margin, the virtual marker 75 is placed at a position that takes into account the overlapping portion (margin portion). You may make it display. FIG. 11 shows a state in which the position of the virtual marker 75 is shifted and displayed in the image by the length of the margin from the marker position during X-ray exposure. By displaying the virtual marker 75 in this manner, the operator can perform positioning in consideration of superposition (margin) only by aligning the position of the marker 5 in the current camera image with the virtual marker position.

  Further, like the X-ray detector 13b shown in FIG. 12, one of the plurality of markers may have the same contour shape as the other markers and have a different internal color or pattern. This makes it easy for the operator to determine whether the X-ray detector 13b is arranged vertically or horizontally based on the marker color or pattern alone. It is particularly suitable for a removable portable FPD or the like. In addition, since the contour of the marker 5 is the same at all positions, it is also suitable for marker overlay determination at the time of positioning. That is, even when the moving direction or the like is not detected, when the marker 5 having a pattern different from the pattern of the virtual marker 75 displayed on the composite image 72 is overlaid, the positioning completion (X-ray exposure is permitted) is notified. What is necessary is to prevent the X-ray detector 13 from determining that the positioning is completed (X-ray exposure is permitted) when the X-ray detector 13 has not moved from the previous X-ray exposure position.

  In the example of FIG. 12, the shape of the X-ray detector 13b is a rectangle, all the markers provided in the frame of the X-ray detector 13b have the same contour shape (circle), and the marker 5b provided at the lower right of these is outlined. Circles and other markers 5 are black. A pattern such as “×” or “◎” may be further written on the marker 5b.

  The preferred embodiments of the present invention have been described in the above embodiments, but the present invention is not limited to the above-described embodiments. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea disclosed in the present application, and these are naturally within the technical scope of the present invention. Understood.

DESCRIPTION OF SYMBOLS 1 ... Image diagnostic apparatus 11 ... High voltage generation part 12 ... X-ray tube 13 ... X-ray detector 14 ... Image processing part 15 ... Display part 16. Operation unit 17 ... Control unit 18 ... Switch 2 ... Video camera 3 ... Subject 4 ... Bed top plate 5, 5a, 5b .... Marker 7 ... Operation screen 71 ... Camera image 72 ... Composite image 74 ... X-ray image 75 ... Virtual marker

Claims (12)

An X-ray source that irradiates the subject with X-rays;
An X-ray detector for detecting X-rays transmitted through the subject;
A camera for imaging the X-ray detector and a subject;
A marker that can be imaged by the camera and indicates the position of the X-ray detector;
A storage unit for storing the position of the marker at the time of X-ray exposure;
The X-ray image is created based on the detected X-ray, the image captured by the camera is captured, the X-ray image is superimposed on the corresponding position on the image, and the X-ray image is captured. An image processing unit for creating a composite video in which a virtual marker indicating the position of the marker is superimposed;
A display unit for displaying the synthesized video;
An image diagnostic apparatus comprising:   The image diagnostic apparatus according to claim 1, wherein the image processing unit creates a long image by connecting a plurality of X-ray images. The moving direction when positioning the X-ray detector is a body axis direction of the subject or a direction perpendicular to and horizontal to the body axis direction,
3. The diagnostic imaging apparatus according to claim 1, wherein the marker is provided at each position indicating at least both ends in the moving direction of the X-ray detector. 4.   The diagnostic imaging apparatus according to claim 3, wherein the marker is provided at a position protruding from the X-ray detector.   The diagnostic imaging apparatus according to claim 1, wherein the X-ray detector is installed on a lower surface of a top plate on which the subject is placed, and the top plate is transparent.   The diagnostic imaging apparatus according to claim 1, wherein the X-ray detector is covered with a cover, and the marker is provided on the cover.   The diagnostic imaging apparatus according to claim 1, wherein one of the markers has an outline shape that is the same as that of another marker and has a different internal color or pattern. The moving direction of the X-ray detector is a body axis direction of the subject or a direction perpendicular to and horizontal to the body axis direction,
The image captured from the camera is monitored, and the marker indicating the position of the end portion that is not the moving direction of the X-ray detector is the position suitable for X-ray exposure when the marker matches the position of the virtual marker. The diagnostic imaging apparatus according to claim 1, wherein notification is performed. The moving direction of the X-ray detector is a body axis direction of the subject or a direction perpendicular to and horizontal to the body axis direction,
Monitoring an image captured from the camera, and controlling the X-ray exposure to be prohibited when the marker indicating the position of the end that is not the moving direction of the X-ray detector does not coincide with the position of the virtual marker. 8. The diagnostic imaging apparatus according to claim 1, wherein the diagnostic imaging apparatus is characterized in that:   Compare the video immediately after the previous X-ray exposure with the current video, determine whether the subject is misaligned, and notify that if the subject is misaligned An image diagnostic apparatus according to any one of claims 1 to 9, wherein   The said image processing part displays the said virtual marker in the position which considered the superimposition, when producing | generating a long image by superimposing a part of several X-ray images. The diagnostic imaging apparatus according to any one of 10. An X-ray source irradiates the subject with X-rays;
An X-ray detector detecting X-rays transmitted through the subject;
A camera imaging the X-ray detector and subject;
Storing a position at the time of X-ray exposure of a marker that can be imaged by the camera and indicating a position of the X-ray detector;
The image processing unit creates an X-ray image based on the detected X-ray, captures an image captured by the camera, superimposes the X-ray image on a corresponding position on the image, and further captures the X-ray image. Creating a composite video in which a virtual marker indicating the position of the marker at the time is superimposed;
Displaying the composite video;
A photographing method characterized by comprising:

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