X-ray fluoroscopic imaging device and image processing device

Abstract

The invention provides an X-ray fluoroscopic imaging apparatus and an image processing apparatus. The present invention addresses the problem of, in a virtual collimation technique for displaying a previous perspective image and a current aperture position, displaying an image in which a deviation is supplemented even if the current aperture field of view deviates from the previous perspective image. An image processing device for generating a fluoroscopic image of an X-ray fluoroscopic imaging device generates a fluoroscopic image when the field of view of a movable aperture is larger than that of a final fluoroscopic image generated finally in a virtual collimation mode, and the fluoroscopic image stored in a past image memory includes an image of an outer region of the final fluoroscopic image. The outer region of the final perspective image is supplemented with the perspective image stored in the past image memory.

Description

Technical Field

[0001] The present invention relates to an X-ray fluoroscopic imaging device capable of generating fluoroscopic images. Background Art

[0002] There is a technology (virtual collimation) that, in an X-ray imaging device capable of capturing fluoroscopic images (dynamic images) and X-ray images (still images), in order to determine the capturing range (aperture position) of the X-ray image, freezes the previous fluoroscopic image (LIH (Last Image Hold) image) and displays it on an image display device, and displays the current aperture position on the image. This technology allows the operator to adjust the aperture position while observing the previous image of the subject.

[0003] Patent Document 1 discloses a technique in which an optical camera is provided in an X-ray imaging device, and a camera image is displayed on an image display device instead of an LIH image, thereby reducing radiation exposure to a subject.

[0004] On the other hand, Patent Document 2 discloses a technology for displaying an X-ray image taken before the catheter is inserted into a blood vessel as a reference image in parallel with the fluoroscopic image in interventional radiology (IVR) in which a catheter is inserted into a blood vessel while observing a fluoroscopic image. The reference image is displayed by enlarging or reducing the field of view so as to be the same as the field of view (region of interest) of the current fluoroscopic image.

[0005] Patent Document 1: Japanese Patent Application Publication No. 2017-63839

[0006] Patent Document 2: Japanese Patent Application Publication No. 2007-159599

[0007] In the virtual collimation technique of displaying the current aperture position on the LIH image, if the field of view of the current aperture is wider than the field of view of the LIH image, an image cannot be displayed around the LIH image.

[0008] In the technology of Patent Document 1, since the camera image is used, the camera image outside the field of view of the LIH image can also be acquired and displayed, but an optical camera needs to be installed on the X-ray imaging device, and the camera image and the fluoroscopic image need to be aligned, so the device structure becomes complicated. In addition, since the inside of the subject cannot be observed in the camera image, it is sometimes difficult for the operator to determine the imaging range of the X-ray imaging based on the camera image.

[0009] On the other hand, the technique of Patent Document 2 requires preparation of a reference X-ray image captured over a wide range before inserting the catheter, and changes in the subject caused by inserting the catheter or placing a stent are not reflected in the reference X-ray image. Summary of the invention

[0010] An object of the present invention is to display an image that complements the deviation even when the current aperture field of view deviates from the LIH image in a virtual collimation technique that displays a previous perspective image (LIH (Last Image Hold) image) and the current aperture position.

[0011] In order to achieve the above-mentioned object, according to the present invention, there is provided an X-ray fluoroscopic imaging device, which comprises: a top plate on which a subject is mounted; an X-ray tube for irradiating the subject with X-rays; a movable aperture for adjusting the irradiation range of the X-rays irradiated from the X-ray tube; an X-ray detector for detecting the X-rays that have penetrated the subject; an image processing device for generating X-ray images of fluoroscopic images and still images based on the output of the X-ray detector; a display image memory for storing the fluoroscopic image as the final fluoroscopic image at the current moment each time the image processing device generates a fluoroscopic image at a prescribed rate, and storing the fluoroscopic image until the next fluoroscopic image is generated, and displaying the image on a connected image display device; a past image memory for storing fluoroscopic images before the current moment generated by the image processing device; and an image supplement device.

[0012] The image processing device includes: a perspective mode for generating a perspective image; a radiographic mode for generating an X-ray image; and a virtual collimation mode. After the perspective mode and before the radiographic mode, the final perspective image stored in the display image memory is overlapped with a mark indicating the position of the movable aperture and displayed on the image display device.

[0013] In the fluoroscopic mode, when the field of view of the fluoroscopic image generated this time is larger in size or deviated in position from the field of view of the fluoroscopic image already stored in the past image memory, the image processing device updates the fluoroscopic image generated this time by storing it in the past image memory.

[0014] The image supplement device generates an image in which the outer area of ​​the final perspective image is supplemented using the perspective image stored in the past image memory in the virtual collimation mode, when the field of view of the movable aperture is larger than the final perspective image stored in the display image memory and the perspective image stored in the past image memory includes an image of the outer area of ​​the final perspective image.

[0015] Effects of the Invention

[0016] According to the present invention, even when the current aperture field of view deviates from the LIH image, an image supplemented with the deviated area using the stored final fluoroscopic image can be displayed, so the operator can adjust the aperture position on the image closest to the current subject state. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a block diagram showing the overall configuration of the X-ray fluoroscopy apparatus according to the first embodiment of the present invention.

[0018] Figure 2 This is a flowchart showing the operation of the X-ray fluoroscopy apparatus according to the first embodiment.

[0019] Figure 3 (a) to (c) are diagrams for explaining the operation of the X-ray fluoroscopy imaging device according to the first embodiment.

[0020] Figure 4 (a) to (e) are diagrams for explaining the operation of the X-ray fluoroscopy apparatus according to the first embodiment.

[0021] Figure 5 (a) to (e) are diagrams for explaining the operation of the X-ray fluoroscopy apparatus according to the first embodiment.

[0022] Figure 6 This is a block diagram showing the overall configuration of an X-ray fluoroscopy apparatus according to Embodiment 2 of the present invention.

[0023] Figure 7 This is a flowchart showing the operation of the X-ray fluoroscopy apparatus according to the second embodiment.

[0024] Figure 8 (a) to (i) are diagrams for explaining the operation of the X-ray fluoroscopy imaging device according to the second embodiment.

[0025] Fig. 9 (a) to (c) are diagrams for explaining the operation of the X-ray fluoroscopy imaging device according to the second embodiment.

[0026] Fig.10 This is a block diagram showing the overall configuration of an X-ray fluoroscopy apparatus according to Embodiment 3 of the present invention.

[0027] Fig.11 This is a flowchart showing the operation of the X-ray fluoroscopy apparatus according to the third embodiment.

[0028] Fig.12 (a) and (b) are diagrams for explaining the operation of the X-ray fluoroscopic imaging device according to the third embodiment.

[0029] Fig.13 This is a diagram for explaining a supplementary screen of the X-ray fluoroscopic imaging device according to the fourth embodiment.

[0030] Fig.14 This is a flowchart showing an example of the operation of the X-ray fluoroscopy apparatus according to the fourth embodiment.

[0031] Fig.15This is a flowchart showing an example of the operation of the X-ray fluoroscopy apparatus according to the fourth embodiment.

[0032] Fig.16 This is a flowchart showing an example of the operation of the X-ray fluoroscopy apparatus according to the fourth embodiment.

[0033] Explanation of symbols

[0034] 10-X-ray tube, 11-X-ray detector, 12-top plate, 13a-aperture blades, 14-high voltage generator, 15-operator, 16-system control device, 17-mechanism control device, 18-past image memory, 20-image processing device, 21-image supplement device, 22-display image memory, 23-image display device, 24-mapped image memory, 25-subject, 27-subject position memory, 28-camera system / aperture position memory, 29-subject position calculation device, 31-past image memory, 32-field of view, 33-area, 34-final perspective image (LIH image), 36-dashed line, 41-maximum field of view size, 42-second size, 44-field of view size, 61-camera, 81-range, 82-grid, 83-area, 83a-area, 83b-area, 83c~83g-area, 84-perspective image, 85-center of field of view. DETAILED DESCRIPTION

[0035] Hereinafter, an X-ray fluoroscopy imaging device according to an embodiment of the present invention will be described with reference to the drawings.

[0036] <<Implementation Method 1>>

[0037] use Figure 1 to Figure 5 , an X-ray fluoroscopic imaging device according to embodiment 1 is described. Figure 1 is a block diagram showing the overall structure of the X-ray fluoroscopy imaging device according to the first embodiment. Figure 2 This is a flowchart showing the operation of the X-ray fluoroscopy device. Figure 3 to Figure 5 This is a diagram that explains the action.

[0038] The X-ray fluoroscopic imaging device includes: a top plate 12 on which a subject 25 is mounted; an X-ray tube 10 for irradiating the subject with X-rays; a movable aperture 13; an X-ray detector 11 for detecting X-rays that have penetrated the subject; an image processing device 20 capable of generating X-ray images of fluoroscopic images and still images based on the output of the X-ray detector 11; an image supplement device 21; a display image memory 22; and a past image memory 31. The movable aperture 13 includes a plurality of aperture blades 13a, and adjusts the irradiation range of the X-rays irradiated from the X-ray tube 10 to the subject 25. A high voltage generator 14 for supplying tube current / tube voltage is connected to the X-ray tube 10. A system control device 16 is connected to the high voltage generator 14 and the movable aperture 13 to control the operation of the high voltage generator 14 and the movable aperture 13. An operator 15 is connected to the system control device, and an operator can set the field of view size of the movable aperture 13 to a desired size or the like through the operator 15.

[0039] Furthermore, a mechanism portion is built into the top plate 12 to move the top plate 12 at least within its main plane. A mechanism control device 17 is connected to the mechanism portion to control the mechanism portion. The mechanism control device 17 can relatively displace the positional relationship between the X-ray tube 10 and the top plate 12 by moving the top plate 12 within its main plane, thereby relatively moving the field of view of the movable aperture 13 on the subject. In addition, the mechanism control device 17 can also move the arm (not shown) supporting the X-ray tube 10 in a direction parallel to the main plane of the top plate 12.

[0040] In addition, in the present embodiment, the relative positional relationship between the top plate 12 and the X-ray tube 10 is not displaced from the time of performing fluoroscopy to the time of performing X-ray imaging.

[0041] In the display image memory 22, each time the image processing device 20 generates a perspective image at a predetermined rate, the generated perspective image is stored as the final perspective image 34 at the current moment. The stored final perspective image 34 is stored in the display image memory 22 until the next perspective image is generated. That is, the final perspective image 34 is a LIH (Last Image Hold) image. The final perspective image (LIH image) 34 stored in the display image memory 22 is displayed on the connected image display device 23 (refer to Figure 3 (a)).

[0042] On the other hand, the past image memory 31 stores perspective images generated by the image processing device 20 before the current time.

[0043] The image processing device 20 can execute a perspective mode, a photographic mode, and a virtual collimation mode. In the perspective mode, the X-ray tube 10 irradiates X-rays at a prescribed photographic rate under the control of the system control device 16. The image processing device 20 generates a perspective image at a prescribed rate based on the output of the X-ray detector 11. In the photographic mode, the X-ray tube 10 irradiates X-rays only once under the control of the system control device 16. The amount of X-rays irradiated in the photographic mode is generally greater than the amount of X-rays irradiated in the perspective mode. The image processing device 20 generates a still image X-ray image based on the output of the X-ray detector 11.

[0044] The virtual collimation mode is a mode performed after the perspective mode and before the photography mode, such as Figure 3 (b) and Figure 3 As shown in (c), the final perspective image (LIH image) 34 stored in the display image memory 22 is overlapped with a mark (here, a dotted line 36) indicating the position (field of view) of the aperture blade 13a of the movable aperture 13 and displayed on the image display device 23.

[0045] In the virtual collimation mode, by observing the image display device 23, Figure 3 (c) shows the final fluoroscopic image (LIH image) 34 and the image of the dotted line 36. The operator can understand the visual field of the movable aperture 13 on the final fluoroscopic image (LIH image) 34 through the dotted line 36. Therefore, the operator can observe Figure 3 (c), while adjusting the field of view of the movable aperture 13 to the desired range of the subject 25 of the final fluoroscopic image (LIH image) 34. After the adjustment, by executing the imaging mode, it is possible to capture an X-ray image of the field of view of the movable aperture 13 while preventing ineffective radiation using the movable aperture 13.

[0046] However, if Figure 3 As shown in (b), when the field of view of the movable aperture 13 is larger than the field of view of the final fluoroscopic image (LIH image) 34, the shape of the subject 25 outside the final fluoroscopic image (LIH image) 34 cannot be grasped. In order to solve this problem, in the first embodiment, the image processing device 20 and the image supplementation device 21 operate as follows.

[0047] That is, when the field of view of the currently generated fluoroscopic image is larger than the field of view of the fluoroscopic image already stored in the past image memory 31 during the execution of the fluoroscopic mode, the image processing device 20 stores the currently generated fluoroscopic image in the past image memory 31. In this way, the past image memory 31 is updated.

[0048] In the virtual collimation mode performed after the perspective mode, the image supplementing device 21 generates an image in which the outer area 33 of the final perspective image (LIH image) 34 is supplemented by the perspective image stored in the past image memory 31, when the field of view of the movable aperture 13 is larger than the final perspective image (LIH image) 34 stored in the display image memory and the perspective image stored in the past image memory 31 includes an image of the outer area 33 of the final perspective image (LIH image) 34. The image supplementing device 21 displays the supplemented image on the image display device 23.

[0049] In the first embodiment, in order to store a fluoroscopic image with a large field of view as close as possible to the generation time of the final fluoroscopic image (LIH image) 34 in the past image memory 31, the past image memory 31 is configured to include a first past image memory 18 and a second past image memory 19 (see Figure 1 The first past image memory 18 stores an image of the maximum visual field size 41 of the movable aperture 13 (reference Figure 4 (a) Figure 5 (a) Figure 5 (b)) The second past image memory 19 stores images having a size equal to or larger than a predetermined second size 42 smaller than the maximum field of view size 41 and smaller than the maximum field of view size (reference Figure 4 (a) Figure 5 (a) Figure 5 (c)).

[0050] In the perspective mode, when the field of view size 44 of the perspective image generated this time is larger than the second size 42 and smaller than the maximum field of view size 41 of the movable aperture 13, the image processing device 20 stores the perspective image generated this time in the second past image memory 19 ( Figure 4 (b)).

[0051] On the other hand, when the field of view size 44 of the perspective image generated this time is equal to the maximum field of view size 41 of the movable aperture 13, the image processing device 20 stores the perspective image generated this time in the first past image memory 18 ( Figure 4 (b)).

[0052] In addition, when any side of the field of view size 44 of the fluoroscopic image is smaller than the second size 42, the image processing device 20 does not store the fluoroscopic image in the first past image memory 18 or the second past image memory 19 (see Figure 4 (d) and Figure 4 (e)).

[0053] In the virtual collimation mode, the image supplementation device 21 is configured such that the field of view of the movable aperture 13 is larger than the final perspective image (LIH image) 34 in the display image memory 22 and smaller than the second size 42 ( Figure 5 (e)), select the perspective image stored in the first past image memory 18 ( Figure 5 (b)) and the perspective image stored in the second past image memory 19 ( Figure 5 The fluoroscopic image in (c)) with a newer generation time is used to supplement the outer area of ​​the final fluoroscopic image (LIH image) 34 .

[0054] On the other hand, in the virtual collimation mode, when the field of view of the movable aperture 13 is larger than the final perspective image (LIH image) 34 and larger than the second size 42 ( Figure 5 (d)), using the perspective image stored in the first past image memory 18 ( Figure 5 (b)) to supplement the outer area of ​​the final perspective image (LIH image) 34.

[0055] Thus, in the X-ray fluoroscopy apparatus of the first embodiment, when performing virtual collimation, Figure 3 As shown in (b), even when the current field of view of the movable aperture 13 is set to be larger than the final fluoroscopic image (LIH image) 34, the outer area of ​​the final fluoroscopic image (LIH image) 34 can be supplemented by using the previous fluoroscopic image. Therefore, the operator can also grasp the shape of the subject 25 in the supplementary area 33, and can easily set the field of view of the movable aperture 13.

[0056] Furthermore, as a supplementary fluoroscopic image, the latest fluoroscopic image can be selected from the second past image memory 19 according to the size and used in the first past image memory 18 , so that an image reflecting the changes of the subject 25 during the fluoroscopic process can be displayed.

[0057] Below, use Figure 2 The process is further described in detail.

[0058] The system control device 16, the image processing device 20, and the image supplement device 21 are composed of a computer or the like having a processor such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit) and a memory. The CPU or the like realizes the functions of the system control device 16, the image processing device 20, and the image supplement device 21 by reading and executing a program stored in the memory (storage unit).

[0059] Furthermore, part or all of the image processing device 20 and the image supplement device 21 may be configured by hardware. For example, a custom IC such as an ASIC (Application Specific Integrated Circuit) or a programmable IC such as an FPGA (Field-Programmable Gate Array) may be used to design a circuit to implement the functions of the system control device 16, the image processing device 20, and the image supplement device 21.

[0060] In the following process, steps S101 to S108 are in perspective mode, steps S109 to S120 are in virtual collimation mode, and steps S121 to S123 are in photography mode.

[0061] in addition, Figure 4 (a) and Figure 5 The second size 42 shown in (a) is predetermined based on a ratio (for example, 60%) to the maximum field of view size 41 of the movable aperture 13 .

[0062] Furthermore, in the following flow, it is assumed that the relative positional relationship between the top plate 12 and the X-ray tube 10 is not changed, and the center of the field of view of the movable aperture 21 is not moved.

[0063] (Step S101)

[0064] When the operator adjusts the movable aperture 13 through the operating device 15 and instructs the system control device 16 to start fluoroscopy, the system control device 16 supplies a predetermined fluoroscopy tube voltage / tube current to the X-ray tube at a predetermined interval (rate (e.g., 20 times / second)) from the high voltage generator 14. As a result, X-rays are irradiated from the X-ray tube 10 at the above-mentioned rate to the subject 25. The X-rays that have passed through the subject 25 are detected by the X-ray detector 11.

[0065] (Step S102)

[0066] The image processing device 20 reads the data from the X-ray detector 11, generates an image based on the data, removes the image portion of the movable aperture 13 in the image to generate a fluoroscopic image, and stores it in the display image memory 22. In this way, the latest fluoroscopic image (final fluoroscopic image 34) is always stored in the display image memory 22, realizing LIH (Last Image Hold).

[0067] (Step S103)

[0068] The image processing device 20 displays the latest fluoroscopic image (final fluoroscopic image (LIH image) 34) in the display image memory 22 on the image display device 23 (refer to Figure 3(a)).

[0069] (Step S104)

[0070] The image processing device 20 determines whether the field of view size 44 of the perspective image in the display image memory 22 is larger than a predetermined second size 42 .

[0071] like Figure 4 (b), Figure 4 As shown in (c), when the field of view size 44 of the fluoroscopic image is larger than the second size 42, the image processing device 20 proceeds to step S105 to store the fluoroscopic image in either the first or second past image memory 18, 19.

[0072] On the other hand, Figure 4 (d) Figure 4 As shown in (e), when the field of view size 44 of the fluoroscopic image is smaller than the second size 42, the fluoroscopic image is not stored in the first and second past image memories 18 and 19, and the image processing device 20 proceeds to step S108.

[0073] (Step S105)

[0074] Next, the image processing device 20 determines whether the field of view size 44 of the perspective image matches the maximum field of view size 41 of the movable aperture 13 .

[0075] like Figure 4 As shown in (a), when the field of view size 44 of the fluoroscopic image matches the maximum field of view size 41 , the image processing device 20 proceeds to step S106 to store the fluoroscopic image in the first past image memory 18 .

[0076] On the other hand, Figure 4 As shown in (b), when the field of view size 44 of the fluoroscopic image is smaller than the maximum field of view size 41, the fluoroscopic image is stored in the second past image memory 19, and the image processing device 20 proceeds to step S107.

[0077] (Step S106)

[0078] The image processing device 20 copies the perspective image in the display image memory 22 to the first past image memory 18 (refer to Figure 4 (b)).

[0079] (Step S107)

[0080] The image processing device 20 copies the perspective image in the display image memory 22 to the second past image memory 19 (refer to Figure 4 (c)).

[0081] (Step S108)

[0082] The image processing device 20 determines whether the operator has instructed to end the fluoroscopy based on the control signal of the system control device 16 , and if the operator has not instructed to end the fluoroscopy, the process returns to step S102 and generates the next fluoroscopic image.

[0083] On the other hand, when the end of the fluoroscopy is instructed, the image processing device 20 proceeds to step S109.

[0084] (Step S109)

[0085] In step S109 , when the operator instructs the operator 15 to change the position (field of view) of the movable aperture 13 in order to execute the virtual collimation mode, the system control device 16 controls the movable aperture 13 to execute the change.

[0086] (Step S110)

[0087] The image supplementation device 21 receives the position of the movable aperture 13 from the system control device 16 to calculate the field of view (region of interest).

[0088] (Step S1 1 1)

[0089] The image supplementation device 21 confirms through the system control device 16 that the relative position of the top plate 12 and the X-ray tube 10 (imaging system) has not changed between the time when the fluoroscopic image (final fluoroscopic image (LIH image) 34 ) displayed in the image memory 22 is generated and the current time.

[0090] (Step S1 12)

[0091] The image supplementation device 21 determines whether the field of view (region of interest) of the movable aperture 13 calculated in step S110 is larger than the final perspective image (LIH image) 34 in the display image memory 22 .

[0092] When the size of the field of view (region of interest) of the movable aperture 13 is smaller than or equal to the size of the final perspective image (LIH image) 34 in the display image memory 22 (refer to Figure 3 (c)), no supplement is needed, so the image supplement device 21 enters step S113.

[0093] On the other hand, when the field of view (region of interest) of the movable aperture 13 is larger than the final perspective image (LIH image) 34 in the display image memory 22 (refer to Figure 3 (b)), the image supplementing device 21 proceeds to step S114 to generate a supplemented image of the supplement area 33.

[0094] (Step S1 13)

[0095] like Figure 3 As shown in (c), the image supplementation device 21 generates an image in which a mark (dashed line 36) indicating the current field of view position of the movable aperture 13 is superimposed on the final perspective image (LIH image) 34, and the process proceeds to step S120.

[0096] (Step S114)

[0097] In step S114, the image supplementation device 21 reduces the final perspective image (LIH image) 34 displayed on the image display device 23 so that the image display device 23 displays the field of view (region of interest) of the movable aperture 13 in full screen ( Figure 3 (b)). As a result, the supplementary region 33 is displayed around the final perspective image (LIH image) 34.

[0098] (Steps S115 to S116)

[0099] Furthermore, in order to select a past perspective image for supplementing the supplementary area 33, the image supplementing device 21 determines whether the field of view (region of interest) of the movable aperture 13 is larger than the second size 42 (step S115). If it is larger, the process proceeds to step S116 to select the perspective image in the first past image memory 18 as the image for supplementation. The image supplementing device 21 cuts out the image of the area outside the field of view 32 of the final perspective image (LIH image) 34 and inside the field of view of the movable aperture 13 from the perspective image in the selected first past image memory 18, and arranges it in the supplementary area 33 outside the final perspective image (LIH image) 34. In this way, a supplemented image is generated.

[0100] (Steps S117~S118).

[0101] On the other hand, when the field of view (area of ​​interest) of the movable aperture 13 is smaller than the second size 42, from the perspective of size, both the perspective images in the first past image memory 18 and the perspective images in the second past image memory 19 can be used for supplementation, so step S117 is entered to select a newer perspective image.

[0102] In step S117 , if the fluoroscopic image in the first past image memory 18 is newer, the process proceeds to step S116 , and if the fluoroscopic image in the second past image memory 19 is newer, the process proceeds to step S118 .

[0103] In step S118, the image supplementing device 21 cuts out an image of a region outside the field of view 32 of the final perspective image (LIH image) 34 and inside the field of view of the movable aperture 13 from the perspective image in the selected second past image memory 19, and arranges it in the supplementing region 33 outside the final perspective image (LIH image) 34. Thus, a supplemented image is generated.

[0104] (Step S119)

[0105] like Figure 3 As shown in (b), the image supplementation device 21 displays the movable aperture position by surrounding the outside of the supplemented image with a dotted line 36, and then proceeds to step S120.

[0106] (Step S120)

[0107] The image supplementation device 21 displays the image generated in step S113 or step S119 on the image display device 23.

[0108] (Steps S121 to S122)

[0109] Next, the system control device 16 determines whether or not there is an instruction for X-ray imaging from the operator, and if there is an instruction, the process proceeds to step S122.

[0110] In step S122, the system control device 16 supplies a predetermined tube voltage / tube current for X-ray photography to the X-ray tube from the high voltage generator 14. As a result, X-rays are irradiated from the X-ray tube 10 to the subject 25, and the X-rays that have passed through the subject 25 are detected by the X-ray detector 11. The image processing device 20 generates an X-ray image within the field of view (dashed line 36) of the aperture 13 from the X-ray detector 11.

[0111] (Step S123)

[0112] When receiving an instruction to restart fluoroscopy from the operator, the system control device 16 proceeds to step S101 to reproduce the fluoroscopy. When there is no instruction to restart fluoroscopy, the process ends.

[0113] By operating the X-ray fluoroscopy imaging device as described above, the periphery of the final fluoroscopic image can be supplemented using the latest image among the past images of the minimum necessary size. Therefore, virtual collimation can be easily performed.

[0114] Furthermore, in this embodiment, the virtual collimation of steps S109 to S120 is described as being performed in preparation for the photography mode, but sometimes virtual collimation is performed in the middle of the perspective mode to change the aperture size. In this case, steps S121 and S122 can of course be set to be Figure 2A perspective-specific process that is excluded from the process.

[0115] In the present embodiment, the number of past image memories 31 is not limited to one or two as described above, but may be three or more. The greater the number of past image memories 31, the higher the probability that the latest image can be used during supplementation.

[0116] <<Implementation Method 2>>

[0117] use Figure 6 to Figure 9 , an X-ray fluoroscopic imaging device according to embodiment 2 is described.

[0118] In the first embodiment, it is assumed that the relative positional relationship between the top plate 12 and the X-ray tube 10 is not changed, and the center of the field of view of the movable aperture 13 is not moved. Therefore, in the first embodiment, a configuration is provided for supplementing when the field of view of the movable aperture 13 is different from the size of the final fluoroscopic image (LIH image) 34. In the second embodiment, by displacing the position of the aperture blades 13a of the movable aperture 13 or by relatively displacing the positional relationship between the top plate 12 and the X-ray tube 10, fluoroscopy is performed while moving the center of the field of view of the movable aperture 13.

[0119] In the second embodiment, when the field of view of the currently generated fluoroscopic image is deviated from the field of view of the fluoroscopic image already stored in the past image memory 31 , the currently generated fluoroscopic image is updated by storing it in the past image memory 31 .

[0120] Then, in the virtual collimation mode, when the field of view of the movable aperture 13 is larger than the final perspective image (LIH image) 34 stored in the display image memory 22 and the perspective image stored in the past image memory 31 includes an image of the outer area of ​​the final perspective image (LIH image) 34, an image is generated by supplementing the outer area of ​​the final perspective image (LIH image) 34 with the perspective image stored in the past image memory 31.

[0121] Below, use Figure 6 to Figure 9 Set it specifically. Figure 6 is a block diagram showing the overall structure of the X-ray fluoroscopy imaging device according to the first embodiment. Figure 7 It is a flowchart showing the actions. Figure 8 and Fig. 9 This is a diagram that explains the action.

[0122] Depend on Figure 6It is understood that the structure is the same as that of the X-ray fluoroscopy apparatus of Embodiment 1, but the mapping image memory 24 is arranged in the past image memory 31, which is different from Embodiment 1. The other structures of the X-ray fluoroscopy apparatus of Embodiment 2 are the same as those of the apparatus of Embodiment 1, so the description is omitted.

[0123] Specifically, in the perspective mode, the image processing device 20 sets a range 81 for the subject 25 on the top plate 12, and sets a grid 82 within the range 81, thereby setting a plurality of regions 83 divided by the grid (see FIG. 1 ). Figure 8 (a)). The sizes of the range 81 and the grid 82 (area 83) are determined in advance.

[0124] In the map image memory 24 of the past image memory 31 , a plurality of storage areas corresponding to the plurality of areas 83 set for the subject 25 are set.

[0125] The image processing device 20 generates a perspective image 84 having a field of view smaller than the range 81 set by the movable aperture 13. Figure 8 As shown in (b), the area 83b where the center 85 of the field of view of the perspective image 84-2 generated this time is located is Figure 8 When the area 83a where the center 85 of the field of view of the last perspective image 84-1 generated in (a) is located is different, the perspective image 84-2 generated this time is stored in the storage area of ​​the mapping image memory 24 of the past image memory 31 corresponding to the area 83a, 83b, 83c, 83d overlapping the field of view of the current perspective image 84-2 for each area 83a, 83b, 83c, 83d, and the mapping image memory 24 is updated for each storage area.

[0126] thus, Fig. 9 The image shown in (a) is stored in the map image memory 24 of the past image memory 31.

[0127] In the virtual collimation mode, the image supplement device 21 is configured to provide a virtual collimation image in which the field of view of the movable aperture 13 is larger than the final perspective image (LIH image) 34 ( Fig. 9 (b)) The supplementary area 33 outside the final perspective image (LIH image) 34 is supplemented by using an image read from one or more storage areas corresponding to the area 33 in the mapping image memory 24 of the past image memory 31 ( Fig. 9 (c)).

[0128] The X-ray fluoroscopic imaging device of embodiment 2 can supplement the supplementary area 33 outside the final fluoroscopic image (LIH image) 34 by storing the fluoroscopic image 84 in multiple storage areas (mapped image memory 24) corresponding to multiple areas overlapping with the fluoroscopic image 84, even when the fluoroscopic image 84 is moved in a time sequence within the range 81 set for the subject 25 for fluoroscopy.

[0129] Below, use Figure 7 The process is described in detail.

[0130] In addition, Figure 7 In the process of implementation mode 1, Figure 2 The same steps of the process are briefly described.

[0131] In the following process, steps S200 to S208 are in perspective mode, steps S209 to S217 are in virtual collimation mode, and steps S218 to S220 are in photography mode.

[0132] (Step S200)

[0133] like Figure 8 As shown in (a), the image processing device 20 sets a range 81 for fluoroscopic imaging of the subject 25 and a plurality of regions 83 divided by a grid (grid) 82 .

[0134] (Steps S201 to S203)

[0135] and Figure 2 Similarly to steps S101 to S103 of the process, fluoroscopy is started (step S201), a fluoroscopy image is generated based on the data of the X-ray detector 11, and is stored in the display image memory 22 (step S202). The image processing device 20 displays the fluoroscopy image 84 in the display image memory 22 on the image display device 23 (refer to Figure 3 (a)).

[0136] (Step S204)

[0137] The image processing device 20 acquires the position of the aperture blades 13 a of the movable aperture 13 and the position of the imaging system (the top plate 12 and the X-ray tube 10 ) from the system control device 16 .

[0138] (Step S205)

[0139] Next, the image processing device 20 calculates the field of view center 85 of the perspective image 84-2 in the display image memory 22, and determines whether the area 83b where the field of view center 85 is located is different from the area 83a where the perspective image 84-1 generated last time is located. If different, the image processing device 20 enters step S206 to update the storage area of ​​the mapping image memory 24 of the past image memory 31.

[0140] (Step S206)

[0141] The image processing device 20 calculates the position of the field of view of the fluoroscopic image 84-2 based on the position of the aperture blades 13a of the movable aperture 13 and the position of the imaging system (top plate 12 and X-ray tube 10) acquired in step S204, and calculates the regions 83a, 83b, 83c, and 83d (see FIG. 1 ) on the subject 25 that overlap with the field of view of the fluoroscopic image 84-2. Figure 8 (b)).

[0142] (Step S207)

[0143] The image processing device 20 copies the fluoroscopic image 84-2 generated this time to the storage area in the mapping image memory 24 of the past image memory 31 corresponding to the area 83a, 83b, 83c, 83d of the subject 25 overlapping the field of view of the fluoroscopic image 84-2, respectively. Thus, the mapping image memory 24 is updated for each storage area.

[0144] (Step S208)

[0145] and Figure 2 Similarly, in step S108 of the process, the image processing device 20 determines whether the operator has instructed to end the fluoroscopy. If not, the process returns to step S102 and repeats the operation of generating the next fluoroscopy image ( Figure 8 (c)~(i)).

[0146] On the other hand, when the end of the fluoroscopy is instructed, the image processing device 20 proceeds to step S209.

[0147] (Step S209)

[0148] In step S109, in order to execute the virtual collimation mode, when the operator instructs to change the position (field of view) of the movable aperture 13 through the operating unit 15, the system control unit 16 controls the movable aperture 13 to execute the change. Furthermore, when the operator instructs to change the position of the imaging system (top plate 12 and X-ray tube 10) through the operating unit 15, the system control unit 16 changes the relative position of the top plate 12 and the X-ray tube 10.

[0149] (Step S210)

[0150] The image supplementation device 21 receives the position of the movable aperture 13 and the position of the imaging system (the top plate 12 and the X-ray tube 10 ) from the system control device 16 , and calculates the position of the field of view (region of interest) of the movable aperture 13 .

[0151] (Steps S211, S212, S215)

[0152] The image supplement device 21 determines whether the field of view (region of interest) of the movable aperture 13 calculated in step S210 is larger than the final perspective image (LIH image) 34 in the display image memory 22. If the size of the field of view (region of interest) of the movable aperture 13 is smaller than the size of the final perspective image (LIH image) 34, no supplement is required, so the image supplement device 21 proceeds to step S215.

[0153] In step S215 , the image supplementation device 21 generates an image in which a mark (dashed line) indicating the current field of view position of the movable aperture 13 is superimposed on the final perspective image (LIH image) 34 , and the process proceeds to step S217 .

[0154] On the other hand, when the field of view (region of interest) of the movable aperture 13 is larger than the size of the final perspective image (LIH image) 34, the process proceeds to step S212, and the image ( Fig. 9 (a) An image of a region corresponding to the field of view (region of interest) of the movable aperture 13 is acquired.

[0155] (Step S213)

[0156] In step S213, Figure 2 Similarly, the image supplementing device 21 reduces the perspective image ( Fig. 9 (b)). As a result, the supplementary region 33 is displayed around the final perspective image (LIH image) 34.

[0157] (Step S214)

[0158] The image supplementation device 21 arranges the image acquired from the mapping image memory 24 in the supplementation area 33 ( Fig. 9 (c)). Thus, a supplemented image is generated.

[0159] (Step S216)

[0160] The image complementing device 21 displays the movable aperture position by surrounding the outside of the complemented image with a dotted line, and proceeds to step S217.

[0161] (Step S217)

[0162] The image supplementation device 21 displays the image generated in step S215 or step S216 on the image display device 23 .

[0163] (Steps S218-S219)

[0164] Then, with Figure 2 Similarly, in steps S121 to S122, the system control device 16 determines whether there is an instruction for X-ray imaging from the operator, and performs X-ray imaging when there is an instruction.

[0165] (Step S220)

[0166] and Figure 2 Similarly, in step S123, the system control device 16 proceeds to step S201 according to the operator's instruction to reproduce the perspective or end.

[0167] As mentioned above Figure 7 As in the process of FIG. 1 , by the operation of the X-ray fluoroscopic imaging device, even when the field of view of the fluoroscopic image 84 moves in time sequence, the periphery of the final fluoroscopic image (LIH image) 34 can be supplemented.

[0168] In the second embodiment, the configuration and operation other than those described above are the same as those of the first embodiment, and thus the description thereof will be omitted.

[0169] <<Implementation Method 3>>

[0170] use Figure 10 to Figure 12 , an X-ray fluoroscopic imaging device according to embodiment 3 is described.

[0171] In the third embodiment, if the position of the subject changes between the time when the fluoroscopic image is stored in the past image memory 31 and when the supplemental image is generated, the position change is detected and reflected in the supplemental image. The position change of the subject is calculated from the camera image.

[0172] To explain in more detail, the X-ray fluoroscopy imaging device includes a subject position calculation device 29 and a subject position memory 27. The subject position calculation device 29 receives an image from a camera 61 that is configured to capture the position of the subject 25 on the top board 12, and calculates the position of the subject 25 on the top board 12. The calculation result of the subject position calculation device 29 is stored in the subject position memory 27.

[0173] The subject position calculation device 29 calculates the position of the subject 25 when the fluoroscopic image generated this time is stored in the past image memory 31 based on the image of the camera 61, and stores it in the subject position memory. In addition, the subject position calculation device 29 calculates the position of the subject 25 based on the image of the camera 61 before generating the supplementary image in the virtual collimation mode, and obtains the difference from the position of the subject 25 stored in the subject position memory 27.

[0174] The image complementation device 21 adjusts the position of the outer region 33 of the final fluoroscopic image (LIH image) 34 complemented by the fluoroscopic image stored in the past image memory 31 based on the obtained difference.

[0175] Fig.10 is a block diagram showing the overall structure of an X-ray fluoroscopic imaging device according to a third embodiment. Fig.11 It is a flowchart showing the actions.

[0176] like Fig.10 As shown in FIG. 1 , a camera 61 is provided at a position where the subject 25 can be photographed. The X-ray fluoroscopic imaging device of the third embodiment includes a subject position memory 27, an imaging system / aperture position memory 28, and a subject position calculation device 29. The functions of these components will be described in detail below. Fig.11 This is clearly stated in the process description.

[0177] In addition, the camera 61 may be installed on the X-ray fluoroscopic imaging device, or may be installed on the wall or ceiling of the inspection room, etc. Furthermore, it may be configured so that a camera installed in the inspection room for other purposes such as a surveillance camera is used as the camera 61, and the system control device 16 receives an image from the camera installed in the inspection room and calculates the position of the subject 25.

[0178] Below, use Fig.11 The operation of the X-ray fluoroscopy imaging device of embodiment 3 is specifically described in the following process.

[0179] In addition, Fig.11 In the process of implementation mode 1, Figure 2 The process or implementation method 2 Figure 7 The same steps of the process are briefly described.

[0180] In the following process, steps S301 to S307 are in perspective mode, steps S308 to S317 are in virtual collimation mode, and steps S318 to S320 are in photography mode.

[0181] (Steps S301 to S303)

[0182] and Figure 2Similarly to steps S101 to S103 of the process, fluoroscopy is started (step S301), a fluoroscopy image is generated based on the data of the X-ray detector 11, and it is stored in the display image memory 22 (LIH) (step S302). The image processing device 20 displays the fluoroscopy image 84 in the display image memory 22 on the image display device 23 (refer to Figure 3 (a)).

[0183] (Step S304)

[0184] The system control device 16 causes the subject position calculation device 29 to calculate the position of the subject 25 on the top board 12 based on the image of the camera 61 , and outputs the calculated position of the subject 25 on the top board 12 to the subject position memory 27 to store it.

[0185] (Step S305)

[0186] Next, the system control device 16 acquires the position of the aperture blades 13 a of the movable aperture 13 and the position of the imaging system (the top plate 12 and the X-ray tube 10 ), and stores them in the imaging system / aperture position memory 28 .

[0187] (Step S306)

[0188] and Figure 2 Similarly, in step S106 of the process, the image processing device 20 copies the fluoroscopic image (final fluoroscopic image (LIH image)) in the display image memory 22 to the past image memory 31 .

[0189] (Step S307)

[0190] and Figure 2 Similarly, in step S108 of the process, the image processing device 20 determines whether the operator has instructed to end the fluoroscopy. If not, the process returns to step S302 to repeat the operation of generating the next fluoroscopy image. On the other hand, if the operator has instructed to end the fluoroscopy, the image processing device 20 proceeds to step S308.

[0191] (Step S308)

[0192] In step S308, when the operator instructs to change the position (field of view) of the movable aperture 13 through the operating unit 15, the system control unit 16 controls the movable aperture 13 to execute the change. Furthermore, when the operator changes the position of the imaging system (top plate 12 and X-ray tube 10) through the operating unit 15, the system control unit 16 changes the relative position of the top plate 12 and the X-ray tube 10.

[0193] (Step S309)

[0194] The image supplementation device 21 receives the position of the movable aperture 13 and the position of the imaging system (the top plate 12 and the X-ray tube 10 ) from the system control device 16 , and calculates the position of the field of view (region of interest) of the movable aperture 13 .

[0195] (Steps S310, S325)

[0196] The image supplement device 21 determines whether the field of view (region of interest) of the movable aperture 13 calculated in step S210 is larger than the final perspective image (LIH image) 34 in the display image memory 22. When the size of the field of view (region of interest) of the movable aperture 13 is smaller than the size of the final perspective image (LIH image) 34, no supplement is required, so the image supplement device 21 proceeds to step S325.

[0197] In step S325 , the image supplementation device 21 generates an image in which a mark (dashed line) indicating the current field of view position of the movable aperture 13 is superimposed on the final perspective image (LIH image) 34 , and the process proceeds to step S318 .

[0198] On the other hand, when the field of view (region of interest) of the movable aperture 13 is larger than the size of the final perspective image (LIH image) 34 , the process proceeds to step S311 .

[0199] (Step S311)

[0200] In step S311, the system control device 16 causes the subject position calculation device 29 to calculate the current position of the subject 25 on the top board 12 based on the image of the camera 61 at the current moment. The calculated current position of the subject is compared with the position of the subject 25 at the time of step S304 stored in the subject position memory 27, and the position difference is calculated. In this way, the position change ( Fig.12 (a)).

[0201] (Step S312)

[0202] In step S312, the system control device 16 obtains the position of the aperture blades 13a of the movable aperture 13 and the position of the imaging system (top plate 12 and X-ray tube 10) at the current time. Then, the system control device 16 calculates the difference between the position of the aperture blades 13a of the movable aperture 13 and the position of the imaging system (top plate 12 and X-ray tube 10) stored in the imaging system / aperture position memory 28 in step S305. Thus, the difference between the position of the aperture blades 13a of the movable aperture 13 and the position of the imaging system (top plate 12 and X-ray tube 10) at the time when the fluoroscopic image is stored in the past image memory 31 in step S306 and the current time can be obtained.

[0203] (Step S313)

[0204] In step S313, the image supplementation device 21 calculates the position of the field of view (area of ​​interest) of the movable aperture 13 on the perspective image (final perspective image (LIH image)) in the past image memory 31 based on the difference in the position of the subject 25 calculated in step S311 and the difference in the camera system / aperture position calculated in step S312.

[0205] (Step S314)

[0206] In step S314, Figure 2 Similarly, the image supplementation device 21 reduces the final perspective image (LIH image) 34 ( Fig.12 (b)). As a result, the supplementary region 33 is displayed around the final perspective image (LIH image) 34.

[0207] (Step S315)

[0208] The image supplementation device 21 arranges the image acquired from the past image memory 31 in the supplementation area 33 outside the final perspective image (LIH image) 34 to generate a supplementary image ( Fig.12 (b)) At this time, the supplementary area 33 is supplemented based on the position of the field of view (region of interest) of the movable aperture 13 obtained in step S313 on the fluoroscopic image (final fluoroscopic image (LIH image)) in the past image memory 31.

[0209] (Step S316)

[0210] The image supplementation device 21 displays the position of the movable aperture 13 by surrounding the outside of the supplemented image with a dotted line, and proceeds to step S317.

[0211] (Step S317)

[0212] The image supplementation device 21 displays the image generated in step S315 or step S316 on the image display device 23 .

[0213] (Steps S318-S319)

[0214] and Figure 2 Similarly, in steps S121 to S122, the system control device 16 determines whether there is an instruction for X-ray imaging from the operator, and performs X-ray imaging when there is an instruction.

[0215] (Step S320)

[0216] and Figure 2 Similarly, in step S123, the system control device 16 proceeds to step S201 to reproduce the perspective or returns to step S308 according to the instruction of the operator.

[0217] In the third embodiment, if the position of the subject changes between the time when the fluoroscopic image is stored in the past image memory 31 and when the supplemental image is generated, the supplemental image can be generated in consideration of the change in the subject's position.

[0218] In Embodiment 3, the configuration and operation other than those described above are the same as those of Embodiments 1 and 2, and thus the description thereof will be omitted.

[0219] <<Implementation Method 4>>

[0220] In the fourth embodiment, in the above-mentioned first to third embodiments, when there is no image data for supplementation of the supplementary area 33, or when the posture of the subject changes greatly and supplementation is not possible, Fig.13 As shown, a mark (hatching, etc.) indicating that there is no data is displayed in the supplementary area 33.

[0221] For example, in the second embodiment, when the map image memory 24 is empty or image data is not stored in the storage area corresponding to the field of view area of ​​the movable aperture 13 , there is no image available for supplementation of the supplementary area 33 .

[0222] Therefore, if Fig.14 As shown in the process of implementation mode 2, Figure 7 Step S401 is inserted between step S213 and step S214 of the process as a process for confirming that the mapping image memory 24 is not empty. In step S401, if the mapping image memory 24 is empty, Fig.13 As shown, hatching indicating that there is no data is displayed in the supplementary region 33 around the final fluoroscopic image (LIH image) 34 (step S402).

[0223] Therefore, the operator observes Fig.13By displaying hatching around the image, it is easy to understand that there is no supplementary image.

[0224] And, if Fig.15 As shown, in the implementation mode 3 Fig.11 Between step S314 and step S315 of the process, a step S411 may be added to determine whether the area corresponding to the supplementary area 33 of the past image memory 31 is empty. In step S411, if the area corresponding to the supplementary area 33 of the past image memory 31 is empty, Fig.13 As shown, hatching indicating that there is no data in the supplementary area 33 around the final fluoroscopic image (LIH image) 34 is displayed (step S412).

[0225] Thus, since there is no supplementary image, the operator can understand that the position of the subject 25 has changed during the period from the time when the last fluoroscopic image (LIH image) was recorded to the current time.

[0226] In addition, as an application example of the third embodiment, Fig.16 process.

[0227] Fig.16 In step S304, not only the position of the subject on the top plate but also the posture is detected from the image of the camera 61 and stored in the subject position memory 27. In step S311, not only the position of the subject at the current moment but also the posture is calculated, thereby calculating the difference between the position and posture in the subject position memory 27. In step S313, the position of the region of interest on the image in the past image memory is calculated using the calculated difference between the position and posture of the subject 25.

[0228] Step S421 is performed between step S314 and step S315. In step S421, when the change in the posture (orientation, etc.) of the subject is greater than a constant amount, the process proceeds to step S422, and hatching is displayed in the supplementation area 33 around the final perspective image (LIH image) 34, and it is displayed that there is no image available for supplementation (step S422).

[0229] Thus, even when the posture of the subject changes by more than a predetermined amount, it is possible to indicate by hatching that there is no image available for supplementation. In addition, since there is no supplementary image, the operator can understand that the position of the subject 25 has changed from the time when the final fluoroscopic image (LIH image) was recorded to the current time.

Claims

1. An X-ray fluoroscopic imaging device, characterized in that: The apparatus comprises: a top plate for carrying a subject; an X-ray tube for irradiating the subject with X-rays; and a movable aperture for adjusting an irradiation range of the X-rays irradiated from the X-ray tube. An X-ray detector for detecting X-rays transmitted through the subject; an image processing device capable of generating X-ray images of fluoroscopic images and still images based on the output of the X-ray detector; a display image memory for storing, whenever the image processing device generates a perspective image at a prescribed rate, the perspective image as the final perspective image at the current moment, and for preserving the image until the next perspective image is generated, and for displaying the image on the connected image display device; a past image memory for storing perspective images generated by the image processing device before the current moment; and image supplement device, The image processing device includes: a perspective mode for generating the perspective image; a photography mode for generating the X-ray image; and a virtual collimation mode, wherein after the perspective mode ends and before the perspective mode is restarted, or before the perspective mode ends and before the photography mode is performed, the final perspective image stored in the display image memory is overlapped with the mark indicating the position of the movable aperture and displayed on the image display device, The image supplement device generates, in the virtual collimation mode, an image in which the outer area of ​​the final perspective image is supplemented using the perspective image stored in the past image memory, when the field of view of the movable aperture is larger than the final perspective image stored in the display image memory and the perspective image stored in the past image memory includes an image of the outer area of ​​the final perspective image.

2. The X-ray fluoroscopic imaging device according to claim 1, characterized in that: In the perspective mode, the image processing device updates the perspective image generated this time by storing it in the past image memory when the field of view of the perspective image generated this time is larger in size or deviated in position from the field of view of the perspective image already stored in the past image memory.

3. The X-ray fluoroscopic imaging device according to claim 2, characterized in that: The past image memory comprises: a first past image memory for storing an image of the maximum field of view size of the movable aperture; and a second past image memory for storing images of a predetermined second size smaller than the maximum field of view size, In the perspective mode, the image processing device stores the perspective image generated this time in the second past image memory when the field of view of the perspective image generated this time is larger than the second size and smaller than the maximum field of view size, and stores the perspective image generated this time in the first past image memory when the field of view of the perspective image generated this time is the maximum field of view size.

4. The X-ray fluoroscopic imaging device according to claim 3, characterized in that: In the virtual collimation mode, when the field of view of the movable aperture is larger than the final perspective image and smaller than the second size, the image supplement device selects a perspective image with a newer generation time from among the perspective images stored in the first past image memory and the perspective images stored in the second past image memory to supplement the outer area of ​​the final perspective image.

5. The X-ray fluoroscopic imaging device according to claim 3, characterized in that: In the virtual collimation mode, when the field of view of the movable aperture is larger than the final perspective image and larger than the second size, the image supplementation device supplements the outer area of ​​the final perspective image using the perspective image stored in the first past image memory.

6. The X-ray fluoroscopic imaging device according to claim 1, characterized in that: The apparatus further comprises a mechanism part, wherein the mechanism part relatively moves the field of view of the movable aperture on the subject by relatively displacing the positional relationship between the top plate and the X-ray tube. The image processing device sets a range for the subject on the top plate in the perspective mode, sets a grid within the range, and sets a plurality of regions divided by the grid. A plurality of storage areas corresponding to the plurality of areas are set in the past image memory, The image processing device generates a perspective image having a field of view smaller than the range set by the movable aperture, and, when an area where the center of the field of view of the perspective image generated this time is located is different from an area where the center of the field of view of the perspective image generated last time is located, stores the perspective image generated this time, for each of the areas, in the storage area of ​​the past image memory corresponding to one or more of the areas overlapping with the field of view of the perspective image generated this time.

7. The X-ray fluoroscopic imaging device according to claim 6, characterized in that: In the virtual collimation mode, when the field of view of the movable aperture is larger than the final perspective image, the image supplement device supplements the outer area of ​​the final perspective image using images read from one or more storage areas of the past image memory corresponding to the outer area.

8. The X-ray fluoroscopic imaging device according to claim 1, characterized in that: When the position of the subject changes on the top plate, the image supplementation device adjusts the position of the outer region of the final fluoroscopic image supplemented with the fluoroscopic image stored in the past image memory based on the change.

9. The X-ray fluoroscopic imaging device according to claim 8, characterized in that: The apparatus further comprises: a subject position calculation device that receives an image from a camera that is configured to capture the position of the subject on the top plate, and calculates the position of the subject on the top plate; and a subject position memory for storing the calculation result of the subject position calculation device, The subject position calculation device calculates the position of the subject when the perspective image generated this time is stored in the past image memory based on the image of the camera, and stores it in the subject position memory, and in the virtual collimation mode, before generating the supplemented image, calculates the position of the subject based on the image of the camera, and calculates the difference from the position of the subject stored in the subject position memory, thereby calculating the change, The image supplementation means adjusts a position of an outer area of ​​the final perspective image supplemented with the perspective image stored in the past image memory based on the difference.

10. The X-ray fluoroscopic imaging device according to claim 1, characterized in that: In the virtual collimation mode, the image supplement device displays a mark indicating that there is no supplementary image in the outer area of ​​the final perspective image when the perspective image is not stored in the past image memory or when the perspective image stored in the past image memory does not include an image of the outer area of ​​the final perspective image.

11. An image processing device for generating a fluoroscopic image of an X-ray fluoroscopic imaging device, The image processing device includes a past image memory storing a perspective image in a perspective mode, The image processing device executes a virtual collimation mode in which a final fluoroscopic image generated last in the fluoroscopic mode is overlapped with a mark indicating a position of a movable aperture of an X-ray fluoroscopic imaging device and displayed on an image display device after the fluoroscopic mode ends and before the fluoroscopic mode is restarted, or after the fluoroscopic mode ends and before the photography mode is performed. In the virtual collimation mode, when the field of view of the movable aperture of the X-ray fluoroscopic imaging device is larger than the final fluoroscopic image and the fluoroscopic image stored in the past image memory includes an image of an outer area of ​​the final fluoroscopic image, an image is generated by supplementing the outer area of ​​the final fluoroscopic image with the fluoroscopic image stored in the past image memory.

Images