JP4453416B2 - X-ray equipment - Google Patents

Description

  The present invention relates to an X-ray imaging apparatus that performs X-ray imaging, and more particularly to a technique for performing imaging while changing an imaging position and displaying images at different imaging positions.

Conventionally, as this type of device, an X-ray transmission mechanism is taken while moving the X-ray imaging mechanism with respect to the top plate, images at different imaging positions are stored in a memory, and the images are synthesized in accordance with the imaging position in the memory. Then, a mask image is generated by deleting overlapping portions and consuming less memory. When capturing a live image, the live image is captured while moving the X-ray imaging mechanism at an appropriate speed. Based on the position information of the X-ray imaging mechanism and the position information corresponding to the image on the memory, An apparatus that generates a subtraction image of an imaging region being imaged (see, for example, Patent Document 1).
JP-A-6-70924

  However, the conventional example having such a configuration has the following problems.

  In other words, the conventional apparatus combines the mask image on the memory according to the imaging position, but when displaying it on the display unit, it corresponds to the mask image combined with the live image of the imaging part currently being imaged. They are simply overwritten sequentially with the subtraction images. In addition, since it can only be observed statically, there is a problem that it is impossible to perform dynamic observation useful for diagnosis on the running state of blood vessels and the like. In addition, in order to display a subtraction image over the entire imaging region in which the X-ray imaging mechanism is moved, there is also a problem that observation can be performed only after the entire imaging is completed.

  The present invention has been made in view of such circumstances, and by devising a configuration relating to display, it can be displayed over the whole regardless of after shooting during shooting, and dynamic display is possible. An object is to provide an X-ray imaging apparatus.

  In order to achieve such an object, the present invention has the following configuration.

That is, the invention according to claim 1 is configured to be relatively movable in order to change the imaging position between the top plate on which the subject is placed and the top plate, and the subject is irradiated with X-rays. X-ray fluoroscopic means for imaging an X-ray transmission image of the imaging region, data conversion means for converting the X-ray transmission image into digital data, storage means for storing the digital data as an image, and storage in the storage means In an X-ray imaging apparatus including an image display unit that performs display based on the displayed image, when images having different imaging positions are read from the storage unit and sequentially displayed on the image display unit, the time is displayed The calculation means for obtaining the arrangement position according to the relative position of the new image with respect to the previous image while the previous image displayed on is displayed, the first display mode for displaying the entire imaging position, and the relative position New A second display mode for individually updating and displaying a new image, and when switching to the first display mode, includes a focused image of the previous image or a new image, Switching means capable of switching to a third display mode in which the image of interest includes a part of the image that precedes and follows in time, and the arithmetic means is for collecting a live image after contrast medium injection. Prior to the contrast agent injection, the mask image is treated as the previous image and the new image and displayed according to the relative position, and a new image is displayed on the image display unit based on the new image arrangement position by the calculation unit. as well as, any imaging position is identical and the image after processing and untreated one of temporally different frames of the previous images, and the imaging position is the same and the image after processing and untreated one The new image of temporally different frames, is characterized in that said superposing the mask image positions are sequentially displayed in accordance with the image pickup position.

[Operation / Effect] According to the invention described in claim 1, a new image at an imaging position different from the previous image adjacent to the previous image in a state in which the previous image displayed in time is displayed. The calculation means obtains an arrangement position corresponding to the relative position. Then, based on the obtained arrangement position, a new image is displayed in parallel with the previous image on the display means. Further, for the previous image and the new image, the ones in the same position and different frames as the respective imaging positions are displayed over the entire imaging region, and the mask images are sequentially superimposed on the arrangement positions corresponding to the respective imaging positions. Update display. Thereby, the previous image and the new image are displayed as a moving image. Therefore, even during imaging , for example, after the imaging, the contrast agent flow in the whole can be dynamically observed after grasping the positional relationship with the mask image. As a result, the quality of diagnosis can be improved. In addition, since the first display mode can be switched to the third display mode by the switching means, the entire observation, individual detailed observation, and individual detailed observation can be performed after grasping the positional relationship in the whole. It becomes possible.

In the present invention, the computing means, the same imaging position, said provided with a function of obtaining a subtraction image by performing a mask image and a subtraction processing based on said live image, a said subtraction image new piece of the previous image and the treated as an image, is preferable a child displaying said subtraction image by superposing before Symbol mask image (claim 2). A mask image is displayed over the entire imaging region, and a subtraction image over the entire imaging region is overlaid and displayed, and the subtraction image is sequentially displayed and displayed as a moving image. Therefore, for example, the running state of the blood vessel can be observed all at once, and the flow of the contrast agent in the whole can be dynamically observed after grasping the positional relationship with the mask image.

Further, in the present invention, the computing means, the same imaging position, provided with a function of obtaining a subtraction image by performing subtraction processing based on said mask image and the live image, the said subtraction image or the live image previous image and the handling as a new image, it is preferable to pre-Symbol superimposed on the mask image displaying the subtraction image or the live image (claim 3). Since a subtraction image or a live image can be displayed over the entire imaging region and can be displayed as a moving image, observation useful for diagnosis can be performed after grasping the positional relationship with the mask image.

Further, in the present invention, the computing means, the same imaging position, determine the subtraction image by performing subtraction processing based on said mask image and the live image, the maximum peak value based further on the temporal order of the subtraction image or provided with a function of obtaining a peak hold image seeking minimum peak value, handle the peak hold image as the previous image and the new image, it is that the previous SL superimposed on the mask image to display the peak hold image Preferred (claim 4 ). Since the mask image and the peak hold image can be displayed over the entire imaging region and can be displayed as a moving image, observation useful for diagnosis can be performed after grasping the positional relationship with the mask image. Furthermore, since the peak hold image is displayed, an unnecessary image (for example, a contrast agent image) remaining at the joint of the imaging region when the subtraction image is displayed can be eliminated, and observation can be performed in a more suitable state.

Further, in the present invention, the computing means, the same imaging position, determine the subtraction image by performing subtraction processing based on said mask image and the live image, the maximum peak value based further on the temporal order of the subtraction image or provided with a function of obtaining a peak hold image seeking minimum peak value, handle the peak hold image or said live image as the previous image and the new image, the peak hold image or superimposed on the front Stories mask image it is preferable to display the live image (claim 5). Since the peak hold image or live image can be displayed over the mask image over the entire imaging region and can be displayed as a moving image, it is useful for diagnosis after grasping the positional relationship with the mask image. Observation becomes possible.

  According to the X-ray imaging apparatus according to the present invention, the arrangement position corresponding to the relative position of the new image at the imaging position different from the previous image is displayed in a state where the previous image displayed before in time is displayed. The calculating means obtains and displays a new image in parallel with the previous image on the display means based on the arrangement position. Further, the previous image and the new image are sequentially updated and displayed at the arrangement positions corresponding to the respective imaging positions at the same positions and different frames as the respective imaging positions. As a result, the previous image and the new image are displayed as a moving image, so that even during shooting, the entire image can be displayed over all the imaging parts as well as after shooting. Display can be performed. As a result, the quality of diagnosis can be improved.

  Embodiment 1 of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram illustrating a schematic configuration of the X-ray imaging apparatus according to the first embodiment.

  The bed 1 includes a top board 3 on which a subject M is placed. The top plate 3 is made of a material that transmits X-rays. An X-ray tube 5 and an X-ray imaging device 7 are disposed at opposing positions sandwiching the top plate 3. These X-ray tube 5 and X-ray imaging device 7 are controlled by X-ray fluoroscopy means 9. That is, under the control of the X-ray fluoroscopic means 9, the X-ray tube 5 emits X-rays, and the X-ray imaging device 7 captures a transmitted X-ray image. Examples of the X-ray imaging device 7 include a device composed of an image intensifier and a TV camera, and a device composed of a flat panel detector. The X-ray fluoroscopic means 9 is configured to be movable in the horizontal direction with respect to the top plate 3 of the bed 1, and outputs “imaging position” as position information to the control unit (25). Instead of outputting the “imaging position” to the control unit (25), the “imaging position” may be output to the storage unit 17 described later and stored as a part of the image.

  The X-ray fluoroscopic means 9 may be fixed in position and moved on the top 3 side.

  An injector 11 is disposed at a position adjacent to the bed 1. A catheter 13 is connected to the injector 11, and a contrast agent is injected into the subject M through the catheter 13. The injection is started, for example, when a signal is given from a control unit (25) described later, and is similarly stopped by a signal from the control unit (25).

  An analog signal (video signal) from the X-ray imaging device 7 is converted into digital data by an A / D converter 15 which is a data conversion unit, and sequentially output to a storage unit 17. The storage unit 17 sequentially stores the given digital data as an image (image data) for each collection frame.

  The arithmetic means 19 performs an operation of simply outputting a plurality of images stored in the storage means 17 to the display means 21, performs a subtraction process between the plurality of images, and the like, and subtracts images generated by the processing. Calculations to be output to the display means 21 are performed. Specifically, one or a plurality of images are processed into a mask image, an image collected after a certain timing is set as a live image, and a difference between these images is generated to generate a subtraction image. To do. The computing unit 19 displays an image on the display unit 21 based on the image stored in the storage unit 17. When an image having a different imaging position is read from the storage unit 17 and displayed on the display unit 21, Although details will be described later, the following processing is generally performed.

  That is, the arrangement position according to the relative position of the new image with respect to the previous image is obtained while the previous image displayed in time is displayed. Based on the arrangement position of the new image thus obtained, a new image is displayed on the display means 21, and the imaging position is the same and the imaging position is the same as the previous image of a different frame. In addition, new images of different frames are sequentially displayed at the arrangement positions corresponding to the imaging positions.

  The control unit 25 has a function of detecting whether or not the contrast agent from the injector 11 has reached the imaging region based on the image stored in the storage unit 17. When the contrast agent reaches the imaging region, it can be determined according to the measurement value corresponding to the pixels constituting the image (analog signal output from the X-ray imaging device 7 converted into digital data). Specifically, for example, a preset threshold value is compared with the above measurement value, and a time point when the measurement value exceeds the threshold value or coincides with the threshold value is detected as a timing at which the contrast agent arrives. Therefore, by monitoring the measurement value stored in the storage unit 17, it can be determined that the contrast agent has reached the imaging region. When the control unit 25 detects the arrival of the contrast agent at the imaging site, the control unit 25 is notified of the timing.

  Note that the above measured values include, for example, an average of all measured values corresponding to all pixels constituting the imaging region.

  When the timing at which the contrast agent has arrived is output from the control unit 25, the timing is notified to the calculation means 19. Receiving this, the calculation means 19 selects a mask image from the images stored in the storage means 17 so far. Further, a new mask image is generated using a plurality of images stored so far and selected as a mask image.

  Note that the threshold for the control unit 25 to determine whether or not the contrast agent has reached is appropriately set in advance by the photographer or the like from the input device 29.

  Reference is now made to FIG. FIG. 2 is a schematic diagram illustrating an example of the positional relationship between the imaging position and the captured image.

  In this example, the imaging region is the lower limb (one leg) of the subject M, and the imaging positions are the three locations indicated by symbols P1 to P3 in the figure. Further, images before injection of contrast medium are collected for each of the imaging positions P1 to P3, and the collection frames constituting these images are set as mask images M1 to M3, and after injection of the contrast medium for each of the imaging positions P1 to P3. These images are collected, and live frames L1 to Ln, Ln + 1 to Ln + m, and Ln + m + 1 to Ln + m + 1 (L small letter L) are set as the collection frames constituting these images. Further, when collecting live images, subtraction processing is performed by performing subtraction processing between the live images L1 to Ln, Ln + 1 to Ln + m, Ln + m + 1 to Ln + m + 1, and the mask images M1 to M3 having the same imaging position. A peak hold image is obtained by obtaining a maximum peak value or a minimum peak value from subtraction images before and after time. In the following description, the symbols L1 to Ln, Ln + 1 to Ln + m, and Ln + m + 1 to Ln + m + 1 are used as a live image, a subtraction image, and a peak hold image as appropriate.

  In this embodiment, the imaging region is one leg of the lower limb of the subject M. However, when the imaging device 7 having a large field of view is provided, both lower limbs may be the imaging region.

  Next, the operation of the apparatus configured as described above will be described with reference to FIG. FIG. 3 is a time chart showing an example of the imaging sequence.

  In FIG. 3, the injection of the contrast agent is performed, for example, after a predetermined time has elapsed after the photographer presses a hand switch (not shown). Specifically, the injector 11 starts injecting contrast medium into the subject M under the control of the control unit 25. In FIG. 3, the time point at which the injection of the contrast medium is started is indicated by the time axis “0”.

  After a predetermined time elapses and before the time point when the contrast agent is supposed to reach the imaging region, the X-ray fluoroscopic means 9 performs imaging while moving the imaging position from P1 to P2 to P3. As a result, image data is sequentially stored in the storage unit 17 for each collection frame. And after returning the X-ray fluoroscopic means 9 to the imaging position P1, since the density | concentration of the contrast agent which flows into an imaging site | part increases gradually, the measured value which comprises the collection frame begins to raise. Accordingly, it is assumed that the measured value reaches the threshold value at a certain time point t1. As a result, the control unit 25 notifies the calculation means 19 and moves the X-ray fluoroscopic means 9 to the respective imaging positions P1 to P3 as described above. The calculation means 19 receives the notification of the timing t1 when the contrast medium reaches the imaging region, and selects a mask image for each of the imaging positions P1 to P3 from the collection frames stored in the storage means 17. Before this timing t1, mask image collection Tm is performed, and each collection frame after timing t1 is live image collection Tv. That is, live images L1 to Ln are obtained at the imaging position P1, live images Ln + 1 to Ln + m are obtained at the imaging position P2, and live images Ln + m + 1 to Ln + m + l are obtained at the imaging position P3. As a specific mask image selection, for example, as shown in FIG. 3, there is a method in which the first acquired frame is used as a mask image for each of the imaging positions P1 to P3. For example, a plurality of acquired frames at the same imaging position are selected. One mask image may be generated for each imaging position by averaging processing or the like.

  In the above description, the mask image and the live image are collected continuously, but the mask image and the live image may be captured separately. In this example, a part of the overlapping region is provided at the imaging position so that the blood vessel running state can be easily grasped. However, the imaging position may be set so as not to overlap.

  Next, imaging and display of a mask image will be described with reference to FIG. 4A and 4B are schematic diagrams when displaying a mask image, in which FIG. 4A is a time when the first imaging region is imaged, FIG. 4B is a time when the second imaged region is imaged, and FIG. It is a schematic diagram which shows the time of imaging | photography of the 3rd imaging region.

  First, the mask image M1 at the first imaging position P1 is displayed on the display means 21 (FIG. 4A). In this respect, there is no difference from the conventional example.

  Next, the mask image M2 at the second imaging position P2 is displayed on the display means 21 (FIG. 4B). However, in the display, the calculation means 19 obtains and displays the arrangement position as follows.

  That is, based on the first imaging position P1 and the second imaging position P2 adjacent to the first imaging position P1, the arrangement position is obtained in consideration of the overlapping area of the mask images M1 and M2. As a result, a mask image M2 (solid line in FIG. 4B) is displayed adjacent to the display means 21 while partially overlapping the mask image M1 displayed in time. become.

  Further, the mask image M3 at the third imaging position P3 is displayed on the display means 21 (FIG. 4C). In this display, the same processing as the display of the mask image M1 and the mask image M2 described above is performed. As a result, on the display means 21, the mask image M1 and the mask image M2 are displayed in a partially overlapping state, and are adjacent to each other while overlapping a part of the mask image M2 displayed in time. Then, the mask image M3 (solid line in FIG. 4C) is displayed.

  Moreover, the display mode in the case where the mask images M1 to M3 are displayed on the display means 21 as described above will be described below with reference to FIG. In the above display, any of the following may be adopted. FIG. 5 is a schematic diagram showing a display mode on the display means. (A) shows a case where all are displayed at the same magnification, and (b) shows a case where the maximum display magnification is set each time. Show.

  In the first display mode (FIG. 5A), when the mask images M1 to M3 are displayed, the display magnification is set so that the entire image can be accommodated while all the mask images M1 to M3 are displayed. All the mask images M1 to M3 are set to be the same. Thereby, the uncomfortable feeling at the time of observation can be suppressed.

  The second display mode (FIG. 5B) is set so that the maximum display magnification is obtained each time the mask images M1 to M3 are sequentially displayed. That is, when the mask image M1 is displayed, the mask image M1 is displayed on the display means 21, and when the mask images M1 and M2 are displayed next, the mask images M1 and M2 are displayed. Is displayed on the display means 21, and when the mask images M1 to M3 are displayed, the mask images M1 to M3 are displayed on the display means 21 at the maximum. As a result, the currently displayed mask image is preferentially enlarged and displayed in detail.

  Next, display of a subtraction image will be described with reference to FIG. FIG. 6 is a schematic diagram showing an example of displaying a subtraction image.

  The image indicated by the solid line frame in FIG. 6 whose display is updated at each imaging position P1 to P3 is the same as the conventional example, but is displayed before in time (displayed at the previous imaging position). It is markedly different from the conventional example in that it is displayed together with a subtraction image (image shown by a dotted line in FIG. 6).

  Specifically, when the image pickup position P1 is picked up, the calculation means 19 performs a subtraction process between the mask M1 and the live image L1, and the resulting subtraction image is displayed at the position where the image pickup position P1 is arranged. To do. Furthermore, each subtraction image is generated from the live images L2 to Ln, which are collection frames at the collection position P1, and the mask image M1, and sequentially displayed at the arrangement position of the imaging position P1. As a result, the subtraction image is displayed as a moving image at the imaging position P1.

  Next, when moving to the imaging position P2, the live image Ln, which is the last collection frame at the imaging position P1, is displayed at the imaging position P1 of the display means 21, and the mask image M2 and the collection frame at the imaging position P2 are used. Each subtraction image is generated from a certain live image Ln + 1 to Ln + m, and sequentially displayed at the arrangement position of the imaging position P2. As a result, the subtraction image is displayed as a moving image at the imaging position P2.

  Furthermore, when moving to the imaging position P3, the subtraction image is displayed as a moving image at the imaging position P3 by performing display in the manner described above.

  As described above, in the state where the subtraction image Ln at the imaging position P1 displayed before in time is displayed, the arrangement position corresponding to the relative position of the subtraction image Ln + 1 at the different imaging position P2 adjacent thereto is displayed. Is calculated by the calculation means 19. Then, based on the obtained arrangement position, the subtraction image Ln + 1 is displayed in parallel on the display means 21 together with the subtraction image Ln. Similarly, in the state where the subtraction images Ln and Ln + m at the imaging positions P1 and P2 are displayed, the arrangement position corresponding to the relative position is obtained for the subtraction images Ln + m + 1 at different imaging positions P3. Then, based on the obtained arrangement position, the subtraction image Ln + m + 1 is displayed in parallel on the display means 21 together with the subtraction images Ln and Ln + m. Further, in each of the imaging positions P1 to P3, for each of the subtraction images L1, Ln + 1, and Ln + m + 1, the same positions as the respective imaging positions P1 to P3 and different acquisition frames L2 to Ln, Ln + 2 to Ln + m, Ln + m + 2 to Ln + m + 1, Are sequentially updated and displayed at the arrangement positions corresponding to the imaging positions P1 to P3. Thereby, when displaying the subtraction image of each imaging position P1-P3, it displays like a moving image. Therefore, even during imaging, the entire image can be displayed over all the imaging parts P1 to P3 as well as after imaging, and in addition, moving image display can be performed at each imaging position P1 to P3. As a result, the quality of diagnosis can be improved.

  In the above description, the subtraction image is displayed. However, instead of this, a peak hold image described later may be displayed.

  In FIG. 6, since the contrast agent remains on the final subtraction images (Ln, Ln + m) at the imaging positions P1 and P2, the imaging positions are shifted to the next imaging positions P2 and P3. An unnecessary contrast agent shadow is reflected on the joint surface between the subtraction images Ln + 2 to Ln + m of P2 and the subtraction images Ln + m + 1 to Ln + m + 1 of the imaging position P3. This does not affect the observation of the blood vessel running state and the blood flow state, and can be eliminated by adjusting the timing of moving the imaging position.

  Next, Embodiment 2 of the present invention will be described with reference to FIG. FIG. 7 is a schematic diagram illustrating an example in which a subtraction image is superimposed and displayed on the mask image according to the second embodiment. The difference from the first embodiment described above is mainly the function of the computing means 19, and the function relating to the display will be described in detail.

In this embodiment, the calculating means 19 is synthesized in accordance with an imaging position location P1~P3 the mask image M1~M3 generates a mask image M0 long, advance the mask image M0 which is the synthesized display means 21 Display it. Next, the calculation means 19 sequentially collects live images L1 to Ln at the imaging position P1, live images Ln + 1 to Ln + m at the imaging position P2, live images Ln + m + 1 to Ln + m + l at the imaging position P3, and each imaging position. A subtraction image is generated by subtraction calculation with the mask images M1 to M3 corresponding to P1 to P3, and is superimposed on the mask image M0 synthesized according to each imaging position P1 to P3 and displayed.

  Further, instead of the subtraction images described above, live images may be superimposed and displayed.

  According to the second embodiment, the subtraction image or the live image can be displayed over the whole of the imaging parts P1 to P3 and can be displayed as a moving image, so that the diagnosis is performed after grasping the positional relationship with the mask image. Useful observation is possible.

  Next, Embodiment 3 of the present invention will be described with reference to FIG. FIG. 8 is a schematic diagram illustrating an example in which a subtraction image is superimposed and displayed on the mask image according to the third embodiment. Only the function of the computing means 19 which is different from the first embodiment will be described in detail.

  In this embodiment, the calculation means 19 generates a long mask image M0 by combining the mask images M1 to M3 according to the imaging pair positions P1 to P3, and displays the combined mask image M0 in advance on the display means 21. Keep it. Next, the computing means 19 obtains the subtraction images L1 to Ln at the imaging position P1 collected one after another, and the maximum peak value or the minimum between the subtraction images L1 to Ln that are adjacent in time. The peak value is calculated, and peak hold images L1 to Ln are obtained over time. Further, the image is superimposed and displayed on the combined mask image M0 according to the imaging position P1. Similarly, subtraction images Ln + 1 to Ln + m at the imaging position P2 are obtained, and peak hold images Ln + 1 to Ln + m are obtained and superimposed on the combined mask image M0 according to the imaging position P2. Further, based on the subtraction images Ln + m + 1 to Ln + m + 1 at the image pickup position P3, the peak hold images Ln + m + 1 to Ln + m + 1 are displayed superimposed on the mask image M0 according to the image pickup position P3.

  According to the third embodiment, the mask images M1 to M3 and the peak hold image can be displayed over the entire imaging regions P1 to P3, and can be displayed as a moving image, so that the positional relationship with the mask image is grasped. In addition, observation useful for diagnosis becomes possible. Furthermore, since the peak hold image is displayed, an unnecessary image (for example, a contrast agent image) remaining at the joint of the imaging region when the subtraction image is displayed can be eliminated, and observation can be performed in a more suitable state.

  Further, instead of the above-described peak hold images, live images may be superimposed and displayed.

  Further, only the peak hold image may be displayed without displaying the mask images M1 to M3. According to this, since only the peak hold image can be displayed as a moving image over the entire imaging regions P1 to P3, for example, the flow of only the contrast agent can be observed in detail.

<Display switching>
In combination with each of the first to third embodiments described above, the display mode may be switched as follows. Reference is now made to FIG. FIG. 9 is an explanatory diagram of the display mode, where (a) shows the first and third display modes, and (b) shows the second display mode.

  As shown in FIG. 9A, the first display mode DM1 is a mode in which the images are displayed in parallel according to the relative positions of the imaging positions P1 to P3 as described in the first to third embodiments. is there. As shown in FIG. 9B, the second display mode DM2 is a mode in which the imaging positions P1 to P3 are all overwritten and displayed at the same position as in the conventional example. In other words, new images are individually displayed at the same position regardless of the relative positional relationship between the imaging positions P1 to P3.

  The first display mode DM1 and the second display mode DM2 are switched by, for example, an instruction from the input device 29 by the photographer. Therefore, the input device 29 corresponds to the switching means in this invention.

  As described above, by selectively switching between the first display mode DM1 and the second display mode DM2, it is possible to observe while grasping the positional relationship over all the imaging regions P1 and P2. On the other hand, when the second display mode DM2 is set, only the imaging position that is currently being captured can be observed in detail. Accordingly, the observation subject can be appropriately switched according to the photographer's intention, so that diagnosis can be suitably performed.

  Further, when switching to the first display mode DM1 and performing display, attention is paid to any one of the plurality of displayed images, and images of images adjacent to the target image temporally before and after are focused. You may comprise so that it can switch to 3rd display mode DM3 displayed so that one part may be included.

  That is, as shown in FIG. 9A, when displaying in the first display mode DM1, for example, all images taken at the imaging positions P1 to P3 are displayed. Here, for example, when attention is paid to the image taken at the imaging position P2, the position is instructed from the input device 29 or the like. Then, the image including the image at the photographing position P2 is displayed including a part of the images at the photographing positions P1 and P3 adjacent to the image. Further, the display may include the shooting position P2 and include only a part of the shooting position P1 or the shooting position P3.

  In this way, by being configured to be able to switch to the third display mode DM3, it is possible to observe only the image of interest in detail while grasping the positional relationship between the front and rear. In addition, by being configured to be able to switch to all of the first display modes DM1 to DM3, it is possible to perform detailed observation individually after grasping the overall observation, individual detailed observation, and the positional relationship in the whole. Become.

  The photographer himself does not instruct to switch the display mode from the input device 29. For example, the current update image is automatically selected as the image of interest, and a part of the image before and after the control is displayed. The overall control may be performed by the unit 25.

  The present invention is not limited to the above-described embodiment, and can be modified as follows.

  (1) In each of the embodiments described above, the arrangement position is obtained by the calculation means 19 and then displayed on the display means 21. However, the following arrangement is also possible.

  For example, the mask image M1 shown in FIG. 4A is held in the frame buffer provided in the previous stage of the display means 21, and the next mask image M2 is combined with the frame buffer at the arrangement position obtained by the calculation means 19. Write. Similarly, the next mask image M3 is combined and written into the frame buffer at the determined arrangement position while being held in the frame buffer. Even with such a configuration, the same effects as those of the above-described embodiments can be obtained.

  (2) In each of the above-described embodiments, the above-described characteristic display is performed during shooting for a mask image, a live image, a subtraction image, a peak hold image, and the like. A similar display may be performed based on the displayed image.

1 is a block diagram illustrating a schematic configuration of an X-ray imaging apparatus according to Embodiment 1. FIG. It is a schematic diagram which shows the example of the positional relationship of an imaging position and the image | photographed image. It is a time chart which shows an example of an imaging sequence. It is a schematic diagram at the time of displaying a mask image, (a) is at the time of imaging of the 1st imaging part, (b) is at the time of imaging of the 2nd imaging part, (c) is the 3rd imaging part. It is a schematic diagram which shows the time of imaging | photography. It is the schematic diagram which showed the display mode to a display means, (a) shows the case where all are made to become the same magnification, (b) shows the case where it is made to become the maximum display magnification each time. It is the schematic diagram which showed the example which displays a subtraction image. FIG. 10 is a schematic diagram illustrating an example in which a subtraction image is superimposed and displayed on a mask image according to the second embodiment. 10 is a schematic diagram illustrating an example in which a peak hold image is superimposed and displayed on a mask image according to Example 3. FIG. It is explanatory drawing about a display mode, (a) shows the 1st and 3rd display mode, (b) shows the 2nd display mode.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Sleeper 3 ... Top plate M ... Subject 9 ... X-ray fluoroscopic means 15 ... A / D converter (data conversion means)
DESCRIPTION OF SYMBOLS 17 ... Memory | storage means 19 ... Calculation means 21 ... Display means 25 ... Control part 29 ... Input device (switching means)
P1 to P3 ... Imaging positions L1 to Ln, Ln + 1 to Ln + m, Ln + m + 1 to Ln + m + 1 ... Live image, subtraction image, peak hold image

Claims (5)

It is configured to be relatively movable in order to change the imaging position between the top plate on which the subject is placed and the top plate, and irradiates X-rays to capture an X-ray transmission image of the imaging portion of the subject. X-ray fluoroscopic means, data converting means for converting the X-ray transparent image into digital data, storage means for storing the digital data as an image, and image display means for performing display based on the image stored in the storage means When the images having different imaging positions are read from the storage unit and sequentially displayed on the image display unit, the previous image displayed before in time is displayed. A calculation means for obtaining an arrangement position corresponding to a relative position of a new image with respect to the previous image, a first display mode for displaying the entire imaging position, and a new image for individually updating and displaying a new image regardless of the relative position. 2 Of the image that includes the focused image of interest of the previous image or a new image, and that is temporally around the focused image when switching to the first display mode. Switching means capable of switching to a third display mode for displaying a part of the image, and the computing means outputs a mask image before injection of the contrast agent before the acquisition of the live image after injection of the contrast agent. An image and the new image are handled and displayed according to the relative position, and the new image is displayed on the image display unit based on the new image arrangement position by the calculation unit, and the image pickup position is the same and after image processing. and the front of one of temporally different frames of the raw image, as well as one of the time to the different frames of the image pickup positions are identical and image processing and after untreated Tana images, X-rays imaging apparatus in accordance with arrangement positions superposed on the mask image, characterized in that successively displayed on the imaging position. In X-ray imaging apparatus according to claim 1, wherein the calculating means, the same imaging position, provided with a function of obtaining a subtraction image by performing subtraction processing based on said mask image and the live image, the subtraction image treated as the front image and the new image, before Symbol X-ray imaging apparatus and displaying the subtraction image by superimposing a mask image. In X-ray imaging apparatus according to claim 1, wherein the calculating means, the same imaging position, provided with a function of obtaining a subtraction image by performing subtraction processing based on said mask image and the live image, the subtraction image or handling the live image as the previous image and the new image, before Symbol X-ray imaging apparatus characterized by superposing the mask image for displaying the subtraction image or the live image. In X-ray imaging apparatus according to claim 1, wherein the calculating means, the same imaging position, determine the subtraction image by performing subtraction processing based on said mask image and the live image, still time before and after the subtraction image the peak hold by seeking maximum or minimum peak value with a function of obtaining the peak hold image, superimposed handling, before Symbol mask image of said peak hold image as the previous image and the new image on the basis of An X-ray imaging apparatus characterized by displaying an image. In X-ray imaging apparatus according to claim 1, wherein the calculating means, the same imaging position, determine the subtraction image by performing subtraction processing based on said mask image and the live image, still time before and after the subtraction image superimposed with a function of obtaining the peak hold image seeking maximum or minimum peak value, handle the peak hold image or said live image as the previous image and the new image, before Symbol mask image on the basis of the And displaying the peak hold image or the live image.

Images