X-ray fluoroscopy apparatus, method for estimating distribution of scattered x-rays using the same, and image processing apparatus

Abstract

The present application relates to an X-ray fluoroscopy apparatus, a scattered X-ray distribution estimation method using the same, and an image processing apparatus. In the X-ray fluoroscopy apparatus, a scattered X-ray radiation dose is grasped. An X-ray radiation dose irradiated by an X-ray generating section, and a position and / or inclination of at least one of the X-ray generating section and a bed table are received. Based on the X-ray radiation dose, and the position and / or inclination, a scattered X-ray radiation dose to at least one position of a predetermined range around the bed table is calculated.

Description

Technical Field

[0001] This invention relates to X-ray fluoroscopic imaging apparatus, and more particularly to an X-ray fluoroscopic imaging apparatus capable of driving an X-ray tube, an X-ray detector, and a bed to obtain images with different imaging directions. Background Technology

[0002] An X-ray fluoroscopy apparatus includes: a bed for placing a patient; an X-ray tube for irradiating the patient with X-rays; and a fluoroscopy table containing an X-ray detector housed within a support frame of the bed. The bed, X-ray tube, and X-ray detector are supported in a drivable manner by a support having multiple movable shafts. These movable shafts are driven by a drive unit. This X-ray fluoroscopy apparatus irradiates the patient with X-rays from the X-ray tube, detects the X-rays passing through the patient using the X-ray detector, generates an X-ray image or fluoroscopic image based on the X-ray signal output from the detector, and displays it.

[0003] In such an X-ray fluoroscopy apparatus, multiple movable axes are driven by a drive unit, allowing the bed and X-ray tube within the fluoroscopy table to move together or individually, thus enabling the X-ray irradiation position to be moved to any location. That is, in the X-ray fluoroscopy apparatus, for example, the X-ray tube and bed can be rotated together while maintaining their positional relationship; or, the X-ray tube can be tilted relative to the bed; or, the bed can be moved along its major or minor axis while maintaining its positional relationship with the X-ray detector; or, the bed can be moved up and down.

[0004] The amount of X-rays irradiated from the X-ray tube is displayed on the display unit of the X-ray imaging device. The X-ray amount is detected by a radiation dosimeter installed near the X-ray tube, or calculated based on X-ray irradiation conditions and information such as the opening of the movable X-ray aperture installed in the X-ray tube.

[0005] Patent Document 1 discloses a technique in which the shape of the X-ray cone irradiated from the X-ray tube is calculated to enable the examiner of the X-ray imaging device to perceive the cone of X-rays, and an image of the X-ray cone is generated and displayed on the display of a wearable device worn by the operator. As a result, since the operator can visually identify the shape of the irradiated X-ray cone and keep their body away from the X-ray irradiation area, the operator's radiation exposure can be reduced.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: JP 2015-134108

[0009] In X-ray fluoroscopy equipment, during X-ray image capture, a portion of the X-rays emitted from the X-ray tube are not absorbed / transmitted by the subject but are scattered in unpredictable directions. These scattered X-rays affect not only the subject but also the radiation exposure of the operator and others; therefore, understanding scattered X-rays is necessary for radiation exposure prevention measures. Summary of the Invention

[0010] The purpose of this invention is to control the dose of scattered X-ray radiation in an X-ray fluoroscopic imaging device.

[0011] To achieve the above objectives, according to the present invention, an X-ray fluoroscopy apparatus is provided, comprising: an X-ray generating unit for irradiating a subject with X-rays; a bed for placing the subject; a support unit for supporting the subject in a manner that allows changes in the position and tilt of at least one of the X-ray generating unit and the bed; and a scattered X-ray radiation dose calculation unit. The scattered X-ray radiation dose calculation unit calculates the scattered X-ray radiation dose at at least one location within a predetermined range surrounding the bed, based on the X-ray radiation dose irradiated by the X-ray generating unit and the position and / or tilt of at least one of the X-ray generating unit and the bed.

[0012] The effects of the invention

[0013] According to the present invention, since the radiation dose of scattered X-rays scattered around the bed can be measured in the X-ray fluoroscopy imaging device, operators and others can effectively carry out activities to reduce radiation exposure to scattered X-rays. Attached Figure Description

[0014] Figure 1 This is a block diagram showing the overall structure of the X-ray fluoroscopic imaging apparatus of this embodiment.

[0015] Figure 2 This is a block diagram showing a partial structure of the X-ray fluoroscopic imaging device according to Embodiment 1 of the present invention.

[0016] Figure 3 This is a flowchart illustrating the processing flow of the X-ray fluoroscopic imaging apparatus according to Embodiment 1 of the present invention.

[0017] Figure 4 This is an example of an image displayed by the X-ray fluoroscopic imaging apparatus according to Embodiment 1 of the present invention.

[0018] Figure 5 This is an example of an image displayed by the X-ray fluoroscopic imaging apparatus according to Embodiment 1 of the present invention.

[0019] Figure 6 This is a block diagram showing a partial structure of the X-ray fluoroscopic imaging device according to Embodiment 2 of the present invention.

[0020] Figure 7 This is a flowchart illustrating the processing flow of the X-ray fluoroscopic imaging apparatus according to Embodiment 2 of the present invention.

[0021] Figure 8 This is an example of an image displayed by the X-ray fluoroscopic imaging device according to Embodiment 2 of the present invention.

[0022] Figure 9 This is a block diagram showing a partial structure of the X-ray fluoroscopic imaging device according to Embodiment 3 of the present invention.

[0023] Figure 10 This is a flowchart illustrating the processing flow of the X-ray fluoroscopic imaging apparatus according to Embodiment 3 of the present invention.

[0024] Figure 11 This is an example of an image displayed by the X-ray fluoroscopic imaging apparatus according to Embodiment 3 of the present invention.

[0025] Figure 12 This is a block diagram showing a partial structure of the X-ray fluoroscopic imaging device according to Embodiment 4 of the present invention.

[0026] Figure 13 This is a flowchart illustrating the processing flow of the X-ray fluoroscopic imaging apparatus according to Embodiment 4 of the present invention.

[0027] Figure 14 This is an example of an image displayed by the X-ray fluoroscopic imaging device according to Embodiment 4 of the present invention.

[0028] Figure 15 This is a block diagram showing a partial structure of the X-ray fluoroscopic imaging device according to Embodiment 5 of the present invention.

[0029] Figure 16 This is a flowchart illustrating the processing flow of the X-ray fluoroscopic imaging apparatus according to Embodiment 5 of the present invention.

[0030] Figure 17 This is an example of an image displayed by the X-ray fluoroscopic imaging apparatus according to Embodiment 5 of the present invention.

[0031] Figure 18 This is an example of an image displayed by the X-ray fluoroscopic imaging apparatus according to Embodiment 5 of the present invention.

[0032] Figure 19 This is a block diagram showing a partial structure of the X-ray fluoroscopic imaging apparatus according to Embodiment 6 of the present invention.

[0033] Figure 20 This is a flowchart illustrating the processing flow of the X-ray fluoroscopic imaging apparatus according to Embodiment 6 of the present invention.

[0034] Figure 21 This is an example of an image displayed by the X-ray fluoroscopic imaging apparatus according to Embodiment 6 of the present invention.

[0035] Figure 22 This is a block diagram showing a partial structure of the X-ray fluoroscopic imaging apparatus according to Embodiment 7 of the present invention.

[0036] Figure 23 This is a flowchart illustrating the processing flow of the X-ray fluoroscopic imaging apparatus according to Embodiment 7 of the present invention.

[0037] Figure 24 This is a flowchart illustrating the processing flow of the X-ray fluoroscopic imaging apparatus according to Embodiment 8 of the present invention.

[0038] Figure 25 This is an example of an image displayed by the X-ray fluoroscopic imaging apparatus according to Embodiment 8 of the present invention.

[0039] Explanation of reference numerals in the attached figures

[0040] 1. Subject

[0041] 2 X-ray tube device

[0042] 3 X-ray aperture

[0043] 3a Opening Adjustment Section

[0044] 3b Filter Selection Section

[0045] 4 beds

[0046] 5 Support section

[0047] 5a pillar

[0048] 5b X-ray support arm

[0049] 5c Bed support arm

[0050] 6 X-ray detectors

[0051] 7 Image Processing Unit

[0052] 8 Image Storage Unit

[0053] 9 Display Section

[0054] 10. Control Department

[0055] 11 Operations Department

[0056] 12 Drive Unit

[0057] 13 High Voltage Generating Unit

[0058] 14. Perspective Shooting Platform

[0059] 20 X-ray generating unit

[0060] 31 Control Department

[0061] 32 Support and control section

[0062] 33 Radiation Dose Calculation and Processing Department

[0063] 40 windows

[0064] Area 41

[0065] 71 Scattered X-ray Radiation Dose Calculation Section

[0066] 81 Scattered X-ray Data Table

[0067] 81a Scattered X-ray Data Table

[0068] 82 Maximum Value Table

[0069] 83 Radiation Dose Unit Table

[0070] 84. Cumulative Radiation Dose Data Storage Unit

[0071] 112 Height Selection Button

[0072] 113 Display mode selection button

[0073] 114 Check Information Selection Button

[0074] 115. Sub-options (select / configure) button

[0075] 116. Inspector's eye height input button

[0076] 117 cameras

[0077] 1001 Images

[0078] 1002 Images

[0079] 1003 Radiation Dose Scale (gauge)

[0080] 1004 units of radiation dose

[0081] 1005 Image Rotation Button

[0082] 1006 Tool Tips

[0083] 1007 Screen zoom-out button

[0084] 1008 Magnification Button

[0085] 1009 Height Display Bar

[0086] 1011 icon

[0087] 1010 items

[0088] 1012 Inspection Information Display Box

[0089] 1013 Auxiliary Option Device

[0090] 1014 Simulation Model

[0091] 1016 icon

[0092] 1017 Chart

[0093] 1018 Body Information

[0094] 1019 Inspection Information

[0095] 1020 images

[0096] 1021 Cumulative radiation dose

[0097] 2021 Mouse Pointer Detailed Implementation

[0098] The embodiments of the present invention are illustrated below using the accompanying drawings.

[0099] Figure 1 This is a diagram showing the overall structure of the X-ray fluoroscopic imaging apparatus of this embodiment. Figure 2 This is a diagram showing the detailed structure of a part of an X-ray imaging device.

[0100] like Figure 1 As shown, the X-ray fluoroscopy apparatus includes a fluoroscopy table 14, an image processing unit 7, an image storage unit 8, and a display unit 9. The fluoroscopy table 14 includes: a bed 4 for placing a subject 1; an X-ray generating unit 20 for irradiating the subject 1 with X-rays; an X-ray detector 6; and a support unit 5. A drive unit 12 is connected to the support unit 5. A high-voltage generating unit 13 is connected to the X-ray generating unit 20. A control unit 10 is connected to the drive unit 12, the image processing unit 7, and the X-ray generating unit. An operation unit 11 is connected to the control unit 10.

[0101] The X-ray generating unit 20 includes: an X-ray tube device 2; and an X-ray aperture 3 for setting the X-ray irradiation area for the subject 1. The X-ray tube device 2 includes: an X-ray tube sphere that receives power from a high-voltage generating unit 13 to generate X-rays. The X-ray aperture 3 includes: a plurality of X-ray shielding lead plates (not shown) for shielding the X-rays generated by the X-ray tube device 2; an opening adjustment unit 3a for adjusting the opening of the X-ray aperture 3 by moving the plurality of X-ray shielding lead plates; an X-ray filter (not shown) for selectively transmitting X-rays of a specific energy; and a filter selection unit 3b for selecting an X-ray filter from a plurality of types. The X-ray aperture 3 is set for the X-ray irradiation area for the subject 1.

[0102] The X-ray detector 6 is positioned opposite the X-ray generating unit 20 and detects X-rays that have passed through the subject 1. The X-ray detector 6 is, for example, a structure in which multiple detection elements for detecting X-rays are arranged in a two-dimensional array. When X-rays that have irradiated from the X-ray tube device 2 and passed through the subject 1 are incident on the multiple detection elements of the X-ray detector 6, an X-ray signal corresponding to the incident amount is output.

[0103] The support portion 5 supports the X-ray generating unit 20, the bed 4, and the X-ray detector 6. The support portion 5 includes: an X-ray support arm 5b supporting the X-ray generating unit 20; a bed support arm 5c supporting the bed 4; and a support column 5a supporting the X-ray support arm 5b. Furthermore, the support portion 5 includes a mechanism for positioning the bed 4... Figure 1 The drive mechanisms shown include: a drive mechanism for moving along the X, Y, and Z axes; a drive mechanism for rotating the bed support arm 5c about a rotation axis parallel to the X-axis to raise and lower the bed 4; a drive mechanism for moving the support column 5a along the X, Y, and Z axes; and a drive mechanism for tilting the X-ray generating unit 20 by rotating the support column 5a about a rotation axis parallel to the X-axis. Each drive mechanism is connected to a drive unit 12, which actuates each drive mechanism.

[0104] The high voltage generating unit 13 supplies power to the X-ray tube device 2.

[0105] The image processing unit 7 receives the X-ray signal output from the X-ray detector 6 and performs given image processing to generate an X-ray image. Examples of image processing include gamma transformation, grayscale transformation, and image magnification / reduction. Furthermore, the X-ray image referred to here includes not only an X-ray image at a specific point in time but also a perspective image (dynamic image) composed of multiple X-ray images in a time series.

[0106] like Figure 2As shown, the image processing unit 7 includes a scattered X-ray radiation dose calculation unit 71. During X-ray image acquisition, a portion of the X-rays irradiated from the X-ray tube device 2 are not absorbed / transmitted by the specimen 1, but are scattered and travel in an indeterminate direction. The scattered X-ray radiation dose calculation unit 71 calculates the radiation dose of the scattered X-rays arriving at at least one predetermined location around the X-ray imaging device. In addition, by calculating the radiation dose of the scattered X-rays arriving at multiple locations within a given area, the scattered X-ray radiation dose calculation unit 71 can also calculate the radiation dose distribution of the scattered X-rays (hereinafter also referred to as the scattered X-ray distribution).

[0107] The image storage unit 8 stores the X-ray image generated by the image processing unit 7 and the radiation dose of the scattered X-rays calculated by the image processing unit 7. In addition, the image storage unit 8 stores in advance the data table or mathematical formula used by the scattered X-ray radiation dose calculation unit 71 to calculate the radiation dose of the scattered X-rays.

[0108] Display unit 9 displays the X-ray image and the radiation dose of the scattered X-rays stored in image storage unit 8. Alternatively, display unit 9 may be configured to directly receive and display the X-ray image and the radiation dose of the scattered X-rays from image processing unit 7.

[0109] The control unit 10 controls the drive unit 12 and the X-ray aperture 3. Furthermore, the control unit 10 provides the scattered X-ray radiation dose calculation unit 71 with the data required for calculating the scattered X-rays.

[0110] The operation unit 11 receives instructions from the operator for the control unit 10.

[0111] The structure and operation of the X-ray fluoroscopic imaging apparatus of this embodiment will be further described in detail below through embodiments 1 to 6.

[0112] <Implementation Method 1>

[0113] First, use Figures 2-5 To illustrate the X-ray fluoroscopic imaging device of Embodiment 1.

[0114] like Figure 2 Thus, the control unit 10 of the X-ray fluoroscopic imaging apparatus of Embodiment 1 includes an aperture control unit 31, a support control unit 32, and a radiation dose calculation and processing unit 33.

[0115] The aperture control unit 31 controls the aperture of the X-ray aperture 3 by controlling the aperture adjustment unit 3a, which moves the X-ray shielding lead plate of the X-ray aperture 3, and the filter selection unit 3b, respectively.

[0116] The support control unit 32 controls the position and orientation of the support column 5a, X-ray support arm 5b and bed support arm 5c of the support 5, as well as the position and orientation of the X-ray tube device 2 and bed 4 supported by the support 5, by controlling the drive unit 12 that drives the drive mechanism of the support 5.

[0117] The radiation dose calculation and processing unit 33 receives the power supplied to the X-ray tube device 2 from the high voltage generation unit 13 and the opening information of the X-ray aperture 3 from the aperture control unit 31. Using the received power supplied to the X-ray tube device 2 and the opening information of the X-ray aperture 3, it calculates the radiation dose (reference radiation dose) irradiated to the subject 1 by a known method.

[0118] The scattered X-ray radiation dose calculation unit 71 of the image processing unit 7 calculates the radiation dose of the scattered X-rays that were irradiated from the X-ray tube device 2 and were not absorbed / transmitted by the subject 1 but were scattered, and displays it on the display unit 9. (The following uses...) Figure 3 The flowchart below illustrates the processing of the scattered X-ray radiation dose calculation unit 71.

[0119] Additionally, in implementation method 1, such as Figure 4 As shown in the example display, the scattered X-ray radiation dose calculation unit 71 calculates the radiation dose of scattered X-rays reaching each of multiple locations arranged in a matrix within a predetermined area 41 surrounding the X-ray fluoroscopy imaging device in the imaging chamber. Thus, the distribution of scattered X-rays within area 41 is calculated and displayed on the display unit 9.

[0120] The scattered X-ray radiation dose calculation unit 71 is composed of a computer equipped with processors such as a CPU (Central Processing Unit) and a GPU (Graphics Processing Unit), and memory. It realizes the calculation by having the processor read and execute the program stored in memory. Figure 3 The process shown is as follows. Alternatively, part or all of the scattered X-ray radiation dose calculation unit 71 can be constructed using hardware. For example, a custom IC such as an ASIC (Application Specific Integrated Circuit) or a programmable IC such as a FPGA (Field-Programmable Gate Array) can be used to design the circuit to realize the function of the scattered X-ray radiation dose calculation unit 71.

[0121] use Figure 3 The process of calculating the scattered X-ray radiation dose in section 71 is explained using the following procedure.

[0122] (Steps S101 to S105)

[0123] In step S101, the scattered X-ray radiation dose calculation unit 71 receives information on the opening of the X-ray aperture 3 from the aperture control unit 31; in step S102, it receives information on the filter of the X-ray aperture 3 from the aperture control unit 31; in step S103, it receives information on the position and tilt of the bed 4, the X-ray generating unit 20, and the support unit 5 from the support control unit 32; and in step S104, it receives information on the reference radiation dose from the radiation dose calculation and processing unit 33.

[0124] In step S105, it is determined whether the information received in steps S101 to S104 has been updated since the last received information. If it has been updated, proceed to step S106.

[0125] (Step S106)

[0126] A table 81 of scattered X-ray data is pre-stored in the image storage unit 8. The table shows coefficients characterizing the radiation dose of scattered X-rays at each position set in a matrix in region 41, according to each combination of the value of the opening of the X-ray aperture 3, the type of filter, the position of the table 4, the X-ray generating unit 20 and the support unit 5 and the tilt value.

[0127] The scattered X-ray radiation dose calculation unit 71 calculates a coefficient characterizing the magnitude of the scattered X-ray radiation dose for each location in region 41 by taking into account the value of the opening of the X-ray aperture 3, the type of filter, the position of the table 4, and the tilt value received in steps S101 to S103, and referring to the scattered X-ray data table 81.

[0128] (Step S107)

[0129] The scattered X-ray radiation dose calculation unit 71 calculates the scattered X-ray radiation dose at each location within region 41 by multiplying the reference radiation dose received in step S104 by the coefficients obtained at each location in step S106. Thus, the scattered X-ray distribution within region 41 can be calculated (estimated).

[0130] (Step S108)

[0131] In step S108, the scattered X-ray radiation dose calculation unit 71 divides the two-dimensional plane of the scattered X-ray distribution in region 41 calculated in step S107 into arbitrary pixel sizes, and assigns color information corresponding to the radiation dose of the scattered X-rays to each pixel. Thus, the scattered X-ray radiation dose calculation unit 71 generates an image of the scattered X-ray distribution.

[0132] (Step S109)

[0133] In step S109, the scattered X-ray radiation dose calculation unit 71 determines the dose calculated in... Figure 4 The orientation of the window 40 of the display unit 9 when displaying an image of the scattered X-ray distribution. This orientation can be a predetermined orientation or an orientation received from the examiner via the operation unit 11.

[0134] (Step S110)

[0135] In step S110, the scattered X-ray radiation dose calculation unit 71 determines the position and tilt of the bed 4, X-ray generating unit 20 and support unit 5 of the X-ray fluoroscopic imaging device, which is displayed as a background image in window 40, based on the information received in step S103.

[0136] (Step S111)

[0137] In step S111, the scattered X-ray radiation dose calculation unit 71 draws an image from the upper surface showing the positions of the bed 4, X-ray generating unit 20, and support unit 5 determined in step S110, as well as the orientation of the tilted fluoroscopic imaging stage 14 determined in step S109.

[0138] (Step S112)

[0139] In step S112, the scattered X-ray radiation dose calculation unit 71 plots the image of the scattered X-ray distribution generated in step S108 in window 40 with the orientation determined in step S109. Thus, as... Figure 4 In this way, the window 40 of the display unit 9 displays an image that overlays the image 1002 of the fluoroscopic imaging stage 14 and the image of the scattered X-ray distribution.

[0140] (Step S1 13)

[0141] In step S1 13, the scattered X-ray radiation dose calculation unit 71 determines whether the mouse pointer 2021 has been configured by the inspector in area 41 of window 40 of display unit 9. If the mouse pointer 2021 has been configured in area 41 of window 40, the process proceeds to step S1 14.

[0142] (Steps S114-S115)

[0143] In step S114, the scattered X-ray radiation dose calculation unit 71 obtains the position of the mouse pointer 2021 and calculates the value of the scattered X-ray radiation dose of the scattered X-ray distribution image at that position. In step S115, the scattered X-ray radiation dose calculation unit 71 displays the calculated value of the scattered X-ray radiation dose in area 41 of window 40 through tooltip 1006.

[0144] Through the above steps, such as Figure 4 As shown, the image 1002 from the fluoroscopic imaging stage 14 and the colorized image 1001 characterizing the distribution of scattered X-rays are overlaid in a window 40.

[0145] In addition, Figure 4 In the display screen, a radiation dose table 1003, which shows the color information of the image 1001 representing the distribution of scattered X-rays and the correspondence between the radiation dose of the scattered X-rays represented by the color information, is displayed together with a radiation dose unit 1004.

[0146] Then, an image rotation button 1005 is displayed on window 40. If the examiner clicks the image rotation button 1005, the image 1002 on the fluoroscopic imaging table 14 and the image 1001 representing the distribution of scattered X-rays will each rotate 90° clockwise each time it is clicked.

[0147] In addition, tooltip 1006 can display the specific value of the scattered X-ray radiation dose at the position of the mouse pointer 2021.

[0148] A zoom-out button 1007 is configured on window 40. When the inspector clicks the zoom-out button 1007, the display will switch to [screen zoom-out mode]. Figure 5 The small screen shown.

[0149] Figure 5 The small screen is from Figure 4 The screen example removes the radiation dose gauge 1003 and radiation dose unit 1004 and adds a magnification button 1008. This is achieved by displaying... Figure 5 The small screen can display the image 1001 of the scattered X-ray distribution in a small screen without hindering the inspection of the screen.

[0150] By Figure 4 as well as Figure 5 The image is displayed on the display unit 9, allowing medical professionals and other examiners to visually perceive the estimated radiation dose of scattered X-rays distributed around the fluoroscopy table 14. This allows them to adjust their standing position, wear X-ray protective clothing, or erect X-ray shielding barriers to reduce radiation exposure by adjusting the amount of scattered X-rays relative to their position.

[0151] <Implementation Method 2>

[0152] use Figures 6-8 To illustrate the X-ray fluoroscopic imaging device of Embodiment 2.

[0153] like Figure 6As shown, the X-ray fluoroscopy imaging apparatus of Embodiment 2 differs from that of Embodiment 1 in the following aspects: a height selection button 112 is provided on the operation unit 11 to select the height of the two-dimensional plane from the ground for obtaining the scattered X-ray distribution; and scattered X-ray data tables 81 are prepared in advance for each height (A, B, C) of the two-dimensional plane from the ground for obtaining the scattered X-ray distribution. Furthermore, the two-dimensional plane here is a plane parallel to the ground, but it can also be a vertical plane or a given inclined plane.

[0154] use Figure 7 The process of the scattered X-ray radiation dose calculation unit 71 in Embodiment 2 will be explained using the following flow. Figure 7 In the process, for implementation method 1 Figure 3 Processes with the same workflow are labeled with the same step numbers, and descriptions are omitted.

[0155] (Steps S101 to S104)

[0156] In steps S101 to S104, the scattered X-ray radiation dose calculation unit 71 and the embodiment 1 Figure 3 The process accepts all information in the same way.

[0157] (Steps S205, 206)

[0158] In the next steps S205 and S206, the scattered X-ray radiation dose calculation unit 71 takes the height of the two-dimensional plane for calculating the scattered X-ray distribution from the ground, which is input by the examiner from the height selection button 112, and determines which of the following heights, Acm, Bcm, and Ccm, is taken.

[0159] (Step S207)

[0160] In step S207, it is determined whether the information received in steps S101 to S104 and S205 to S206 has been updated since the last received information. If it has been updated, proceed to step S208.

[0161] (Step S208)

[0162] In step S208, the scattered X-ray radiation dose calculation unit 71 selects a scattered X-ray data table 81 corresponding to the height determined in step S206. Referring to the selected scattered X-ray data table 81, the scattered X-ray radiation dose calculation unit 71 calculates a coefficient characterizing the magnitude of the scattered X-ray radiation dose at each location within region 41, based on the value of the opening of the X-ray aperture 3 received in steps S101 to S103, the type of filter, and the position and tilt value of the table 4, etc.

[0163] (Step S209)

[0164] like Figure 8 As shown, the window 40 of the display unit 9 displays an image of a height bar 1010 representing the height of a two-dimensional plane above the ground, indicating the distribution of scattered X-rays; and a height display bar 1009 representing the height. In step S209, the scattered X-ray radiation dose calculation unit 71 updates the position of the height bar 1010 to the height determined in step S206. Furthermore, the scattered X-ray radiation dose calculation unit 71 updates the height of the height display bar 1009.

[0165] (Steps S107~S115)

[0166] The processing of steps S107 to S115 after step S209 is the same as in embodiment 1, so the explanation is omitted.

[0167] like Figure 8 As shown, in the X-ray fluoroscopic imaging apparatus of Embodiment 2, the distribution of scattered X-rays in a two-dimensional plane at the height selected by the examiner is displayed in window 40. Therefore, the examiner can visually capture the distribution of scattered X-rays in a two-dimensional plane at the selected height, enabling efficient implementation of radiation exposure reduction activities.

[0168] Other structures and processes of the X-ray fluoroscopic imaging apparatus in Embodiment 2, besides those described above, are the same as those in Embodiment 1, and therefore will not be described in detail.

[0169] <Implementation Method 3>

[0170] use Figures 9-11 To illustrate the X-ray fluoroscopic imaging device of Embodiment 3.

[0171] like Figure 9 Thus, the X-ray fluoroscopic imaging device of Embodiment 3 differs from the imaging devices of Embodiments 1 and 2 in that a display mode selection button 113 is provided in the operation unit 11, which selects whether the display of the scattered X-ray distribution is set to cumulative mode or real-time mode.

[0172] use Figure 10 The process of the scattered X-ray radiation dose calculation unit 71 in Embodiment 3 will be explained using the following flow. Figure 10 The process in implementation method 1 Figure 3 Steps S312 to S316 are inserted between steps S107 and S108 in the process. Figure 10 In the process, steps not shown are due to... Figure 3 The process is the same, so the diagram is omitted.

[0173] (Steps S101 to S107)

[0174] First, the scattered X-ray radiation dose calculation unit 71 of Embodiment 3 performs the calculation of Embodiment 1. Figure 3 Steps S101 to S107 are used to calculate the scattered X-ray distribution, and then proceed to... Figure 10 Step S312.

[0175] (Step S312)

[0176] In step S312, the scattered X-ray radiation dose calculation unit 71 determines whether the cumulative mode or the real-time mode was selected by the display mode selection button 113.

[0177] (Steps S313, 314)

[0178] When the cumulative mode is selected in the display mode selection button 113, the scattered X-ray radiation dose calculation unit 71 accumulates the radiation dose value for each position of the scattered X-ray distribution in a time series in step S313, and calculates the cumulative scattered X-ray distribution.

[0179] Next, in step S314, the radiation dose calculation unit 71 changes the radiation dose unit 1004 of the radiation dose table 1003 displayed in the window 40 of the display unit 9 to the radiation dose display unit of the time unit used to characterize the cumulative mode.

[0180] (Steps S315, 316)

[0181] On the other hand, when the real-time mode is selected in the display mode selection button 113, the scattered X-ray radiation dose calculation unit 71 calculates the average scattered X-ray distribution per unit time in step S315.

[0182] Next, in step S315, the scattered X-ray radiation dose calculation unit 71 will display the radiation dose unit 1004 of the radiation dose table 1003 displayed in the window 40 of the display unit 9, such as... Figure 11 That would change the unit to represent the average amount of scattered X-rays per unit time used in real-time models.

[0183] In addition, such as Figure 11 In this way, the icon 1011 indicating real-time mode will be displayed in area 41 of window 40, allowing the inspector to identify the mode.

[0184] (Steps S108 to S115)

[0185] The scattered X-ray radiation dose calculation unit 71 performs Embodiment 1. Figure 3Steps S108 to S115 are performed, and the image of the cumulative scattered X-ray distribution or the average scattered X-ray distribution calculated in S313 or S315 and the image of the fluoroscopic imaging stage 14 are displayed in area 41.

[0186] As described above, according to the X-ray fluoroscopy apparatus of Embodiment 3, the examiner can switch the display of the scattered X-ray distribution to either cumulative mode or real-time mode. Thus, the examiner can visually perceive the distribution of scattered X-rays around the fluoroscopy table 14, enabling efficient radiation exposure reduction activities.

[0187] Alternatively, it can also be implemented in embodiment 2. Figure 7 Steps S312 to S316 of Implementation Method 3 are performed between steps S107 and S108 of the process.

[0188] <Implementation Method 4>

[0189] use Figures 12-14 To illustrate the X-ray fluoroscopic imaging device of Embodiment 4.

[0190] The X-ray fluoroscopic imaging device of Embodiment 4 has a structure that appropriately sets the maximum value of the radiation dose gauge 1003 and the radiation dose unit 1004 displayed in the window 40 of the display unit 9 according to the content of the examination to be performed.

[0191] Therefore, such as Figure 12 As shown, the operation unit 11 is equipped with an examination information selection button 114 for the examinee to select the type of examination to be performed (e.g., gastric health examination, chest X-ray, lower extremity X-ray, cardiac catheterization).

[0192] Furthermore, the image storage unit 8 stores in advance: a table 82 showing the maximum value of the radiation dose table 1003 for each inspection; and a table 83 showing the radiation dose unit 1004 for each inspection. The maximum value of the radiation dose table 1003 in table 82 corresponds to a threshold of radiation dose separately set for each inspection and is a predetermined value. For example, in inspections requiring a high radiation dose and inspections where a low radiation dose is sufficient, the maximum value of the radiation dose for the scattered X-rays differs greatly. Therefore, the maximum value of the radiation dose table 1003 and its radiation dose unit are preset in tables 82 and 83 for each inspection to ensure appropriate values ​​and appropriate radiation dose units.

[0193] Other structures are the same as those in Embodiment 1, so descriptions are omitted.

[0194] Next, use Figure 13The process of the scattered X-ray radiation dose calculation unit 71 in Embodiment 4 will be explained using the following flow. Figure 13 In the process, for implementation method 1 Figure 3 Processes with the same workflow are labeled with the same step numbers, and descriptions are omitted.

[0195] First, the examinee selects the type of examination to be performed (gastric health examination, chest X-ray, lower extremity X-ray, cardiac catheterization, etc.) on the examination information selection button 114 of the operation unit 11.

[0196] (Steps S401, S402)

[0197] In step S401, the scattered X-ray radiation dose calculation unit 71 receives the inspection information selected by the inspection information selection button 114 of the operation unit 11. The scattered X-ray radiation dose calculation unit 71 displays the inspection information display box 1012 in the window 40 of the display unit 9, and displays the received inspection information within the inspection information display box 1012.

[0198] In step S402, the scattered X-ray radiation dose calculation unit 71 begins the identification and inspection, and begins the calculation preparation for the scattered X-rays.

[0199] (Steps S101 to S107)

[0200] The scattered X-ray radiation dose calculation unit 71 performs the steps S101 to S107 in the same manner as in Embodiment 1 to calculate the scattered X-ray distribution.

[0201] (Steps S403, S404)

[0202] In step S403, the scattered X-ray radiation dose calculation unit 71 refers to the maximum value table 82 of the image storage unit 8 to determine the maximum value of the scattered X-ray radiation dose table 1003 corresponding to the inspection information such as the type of inspection received in step S401. The scattered X-ray radiation dose calculation unit 71 then changes the radiation dose table 1003 in the window 40 of the display unit 9 to the radiation dose table with the determined maximum value.

[0203] Next, the scattered X-ray radiation dose calculation unit 71, referring to the radiation dose unit table 83 of the image storage unit 8 in step S404, determines the radiation dose unit 1004 of the radiation dose table 1003 corresponding to the examination information such as the type of examination received in step S401. The scattered X-ray radiation dose calculation unit 71 changes the radiation dose unit 1004 of the window 40 of the display unit 9 to the determined radiation dose unit.

[0204] (Step S108)

[0205] In step S108, the scattered X-ray radiation dose calculation unit 71 divides the two-dimensional plane of the scattered X-ray distribution in region 41 calculated in step S107 into arbitrary pixel sizes, and assigns color information corresponding to the radiation dose of the scattered X-rays to each pixel. Thus, the scattered X-ray radiation dose calculation unit 71 generates an image of the scattered X-ray distribution.

[0206] In this embodiment 4, the scattered X-ray radiation dose calculation unit 71 determines the color information corresponding to the scattered X-ray radiation dose based on the maximum value of the radiation dose table 1003 and the radiation dose unit 1004 determined in steps S403 and S404.

[0207] (Steps S109 to S115)

[0208] In steps S109 to S115, the scattered X-ray radiation dose calculation unit 71 performs the same processing as steps S109 to S115 of Embodiment 1, and displays the image of the scattered X-ray distribution and the image of the fluoroscopic imaging stage 14, which serves as the background image, superimposed on the area 41 of the display unit 9.

[0209] Thus, the X-ray fluoroscopic imaging device of Embodiment 4 can be linked to a threshold set separately for each examination, switching the maximum value (total) of the radiation dose meter displaying the amount of scattered X-rays between examinations that require a high radiation dose and examinations where a low radiation dose is sufficient. The examiner can then differentiate the radiation exposure reduction activities to be performed in each examination.

[0210] In addition, the functions of implementation method 4 can be combined with those of implementation methods 2 to 3.

[0211] <Implementation Method 5>

[0212] use Figures 15-17 To illustrate the X-ray fluoroscopic imaging device of Embodiment 5.

[0213] The X-ray fluoroscopic imaging apparatus of Embodiment 5 has the following function: when X-ray protection accessories (hereinafter referred to as accessory options) are arranged on and around the fluoroscopic imaging table 14, the scattered X-ray distribution is calculated taking into account the X-ray protection provided by the accessory options. Other structures are the same as in Embodiment 1.

[0214] Specifically, in the X-ray fluoroscopic imaging apparatus of Embodiment 5, an auxiliary option selection / configuration button 115 is provided on the operation unit 11. The auxiliary option selection / configuration button 115 is an interface for selecting and configuring auxiliary option devices 1013 such as X-ray shielding barriers and X-ray shielding curtains. Furthermore, in order to calculate the distribution of scattered X-rays by taking into account the effect of the examinee or other human body shielding X-rays, a simulation model 1014 of the examinee is included as one of the selectable auxiliary options. The examinee can select and configure auxiliary option devices 1013 such as X-ray shielding barriers and X-ray shielding curtains using the auxiliary option selection / configuration button 115.

[0215] In addition, the scattered X-ray data table 81 in the image storage unit 8 stores a table of coefficients for the magnitude of the radiation dose of scattered X-rays at each location in the characterization area 41 when no auxiliary option device is present (Embodiment 1), and also stores a table 81a of coefficients when an auxiliary option device is present. The table 81a of coefficients when an auxiliary option device is present is prepared separately according to the type and configuration of the auxiliary option.

[0216] use Figure 16 The process of the scattered X-ray radiation dose calculation unit 71 in Embodiment 5 will be explained using the following flow. Figure 16 The process in implementation method 1 Figure 3 Steps S501 to S504 are inserted between steps S106 and S107 in the process.

[0217] (Steps S101 to S106)

[0218] First, the scattered X-ray radiation dose calculation unit 71 of Embodiment 3 performs the calculation of Embodiment 1. Figure 3 Steps S101 to S106 are used to calculate the coefficient representing the magnitude of the radiation dose that indicates the distribution of scattered X-rays.

[0219] (Step S501)

[0220] In step S501, the scattered X-ray radiation dose calculation unit 71 determines whether an auxiliary option has been selected in the auxiliary option selection / configuration button 115 of the operation unit 11. If it has been selected, the process proceeds to step S502; otherwise, it proceeds to step S107.

[0221] (Step S502)

[0222] When an auxiliary option is selected in the auxiliary option selection / configuration button 115, the scattered X-ray radiation dose calculation unit 71 accepts the type of auxiliary option in step S502 via the auxiliary option selection / configuration button 115.

[0223] (Step S503)

[0224] In step S503, the scattered X-ray radiation dose calculation unit 71 accepts the configuration of auxiliary options via the auxiliary option selection / configuration button 115.

[0225] (Step S504)

[0226] In addition to the information received in steps S101 to S103, the scattered X-ray radiation dose calculation unit 71 also uses the information received in steps S502 and S503 and refers to the scattered X-ray data table 81a when an auxiliary option device is present. As a result, it determines a coefficient characterizing the magnitude of the scattered X-ray radiation dose for each position in region 41.

[0227] (Step S107)

[0228] The scattered X-ray radiation dose calculation unit 71 multiplies the coefficient obtained in step S106, or the coefficient determined in step S504 if the coefficient was determined again, with the reference radiation dose received in step S104 to calculate the scattered X-ray radiation dose at each location within region 41. Thus, the scattered X-ray distribution within region 41 can be calculated taking into account the X-ray shielding performed by the auxiliary options.

[0229] (Steps S108-115)

[0230] In steps S108 to S115, considering the X-ray shielding performed by the auxiliary options, the distribution of scattered X-rays within region 41 is displayed on display unit 9. At this time, it is desirable to also display the shape and arrangement of the auxiliary options as an image on display unit 9. The processing of steps S108 to S115 other than this is the same as in Embodiment 1, and therefore will not be described.

[0231] Furthermore, the following description is provided based on embodiment 1. Figure 3 The process is used to calculate and display the scattered X-ray distribution in the case of the configuration of the auxiliary options in this embodiment, but it can of course be combined with the processing of embodiments 2 to 4.

[0232] Figure 17 This is an example of an image showing the distribution of scattered X-rays when an X-ray shielding barrier and a simulated model 1014 of the examiner are configured as an accessory device 1013 near the X-ray fluoroscopy table 14. Figure 18 This is an example image showing the distribution of scattered X-rays when the X-ray shielding curtain 1015 (an optional accessory) covers the area around the X-ray generating unit 200. Either way, it is as shown in the image. Figure 8 As the comparison clearly shows, the distribution of scattered X-rays can be changed by configuring the auxiliary options.

[0233] Thus, according to this embodiment 5, since the scattered X-ray distribution can be obtained by simulating the options of the actual X-ray imaging stage 14 and the configuration of the person, a more realistic scattered X-ray distribution can be displayed.

[0234] <Implementation Method 6>

[0235] use Figures 19-21 To illustrate the X-ray fluoroscopic imaging device of Embodiment 6.

[0236] The X-ray fluoroscopic imaging device of Embodiment 6 has the following function: it stores the radiation dose of scattered X-rays from specific parts of the examinee, such as the eyes, in a time sequence and displays the cumulative radiation dose. Other structures are the same as in Embodiment 1.

[0237] Specifically, the operation unit 11 is equipped with a button 116 for inputting or selecting the height of the examiner's eyes. This eye height input button 116 can be a structure for selecting or inputting the height of the eyes, or it can be a structure for inputting information such as the examiner's height that can be calculated to determine the height of the eyes.

[0238] In addition, the scattered X-ray data table 81 can be prepared in advance by pressing button 116 for each of the multiple heights that can be accepted as the eye height, and stored in the image storage unit 8.

[0239] The image storage unit 8 is provided with a cumulative radiation dose data storage unit 84 for storing cumulative radiation dose data.

[0240] Next, use Figure 20 The process of the scattered X-ray radiation dose calculation unit 71 in Embodiment 6 will be explained using the following flow. Figure 20 In the process, for implementation method 1 Figure 3 Processes with the same workflow are labeled with the same step numbers, and descriptions are omitted.

[0241] First, the examiner inputs or selects the eye height using the eye height input button 116. Additionally, the examiner maintains a position indicated by the mouse pointer in area 41.

[0242] (Steps S101 to S104)

[0243] The scattered X-ray radiation dose calculation unit 71 performs the processing steps S101 to S103 in the same manner as in Embodiment 1, receiving aperture opening information, filter information, and support information. Furthermore, the scattered X-ray radiation dose calculation unit 71 receives reference radiation dose information in step S104.

[0244] (Step S601)

[0245] The scattered X-ray radiation dose calculation unit 71 receives the eye height from the examiner's eye height input button 116.

[0246] Steps S601 to S609 are the same controls as in Implementation Method 1.

[0247] (Steps S105, S602)

[0248] In step S105, the scattered X-ray radiation dose calculation unit 71 determines whether the information in steps S101 to S104 has been updated since the last time. If it has been updated, in step S602, the scattered X-ray radiation dose calculation unit 71 calculates a coefficient characterizing the magnitude of the scattered X-ray radiation dose for each position in the two-dimensional plane of the examiner's eye height in region 41, based on the aperture opening information, filter information, support information received in steps S101 to S103, and the examiner's eye height information received in step S601, and with reference to the scattered X-ray data table 81.

[0249] (Step S603)

[0250] In step S603, the scattered X-ray radiation dose calculation unit 71 multiplies the reference radiation dose received in step S104 by the coefficients obtained for each position in step S602 to calculate the scattered X-ray radiation dose at each position on the two-dimensional plane at the height of the examiner's eye in region 41. Thus, the scattered X-ray distribution at the height of the examiner's eye in region 41 is calculated.

[0251] (Steps S108~S112)

[0252] The scattered X-ray radiation dose calculation unit 71 performs the processing steps S108 to S112 in the same way as in Embodiment 1, and draws the fluoroscopic imaging stage and the scattered X-ray distribution on the window 40 of the display unit 9 and displays them.

[0253] (Steps S113, S604)

[0254] In step 113, the scattered X-ray radiation dose calculation unit 71 determines whether there is a mouse pointer indicating the position of the inspector on the scattered X-ray distribution map. If there is, it proceeds to step S604 and calculates the scattered X-ray dose at the position of the mouse pointer based on the scattered X-ray distribution calculated in step 603.

[0255] (Step S605)

[0256] In step 605, the scattered X-ray radiation dose calculation unit 71 reads the cumulative radiation dose data stored in the cumulative radiation dose data storage unit 84 of the image storage unit 8 during the processing of the previous step S606 in the inspection.

[0257] (Step S606)

[0258] In step 606, the scattered X-ray radiation dose calculation unit 71 adds the current scattered X-ray radiation dose obtained in step S604 to the previously read cumulative radiation dose data to calculate the current cumulative radiation dose. The calculated cumulative radiation dose data is stored in the cumulative radiation dose data storage unit 84 of the image storage unit 8. The cumulative radiation dose data includes not only the cumulative radiation dose value, but also the scattered X-ray radiation dose data at the mouse pointer position at that time point, obtained during the processing of step S606, and the time at which it was obtained.

[0259] (Step S607)

[0260] In step 607, the scattered X-ray radiation dose calculation unit 71, as shown... Figure 21 Then, draw the icon 1016 representing the inspector at the position of the mouse pointer in area 41 of window 40. Thus, as... Figure 21 In this way, the examiner's position is displayed in area 41, which shows the distribution of X-ray scattering.

[0261] (Step S608)

[0262] In step 608, the scattered X-ray radiation dose calculation unit 71 generates a graph 1017 representing the current cumulative radiation dose calculated in step S606, etc., in window 40 as shown. Figure 21 That is how it is displayed. Here, a graph showing both the cumulative radiation dose and the radiation dose of scattered X-rays over time is displayed.

[0263] Thus, the X-ray fluoroscopic imaging device of Embodiment 6 can store the radiation dose of scattered X-rays at specific locations, such as the position of the examinee's eyes, in a time sequence and display the cumulative radiation dose. Therefore, the examinee can monitor the cumulative radiation dose of the eye (lens) and perform radiation exposure reduction activities by changing their standing position, etc.

[0264] <Implementation Method 7>

[0265] use Figures 22-23 To illustrate the X-ray fluoroscopic imaging apparatus of Embodiment 7.

[0266] In the X-ray fluoroscopy imaging device of Embodiment 6, the position of the examinee's eyes is received via input button 116 and the examinee indicates the position using a mouse pointer. However, the X-ray fluoroscopy imaging device of Embodiment 7 uses camera 117 to capture the position of the examinee's eyes and the examinee's position and orientation. Therefore, it has the function of displaying the cumulative radiation dose estimated to have been received by the examinee.

[0267] Specifically, a camera 117 is connected to the image processing unit 7 to capture images of the examiner's eye position and the examiner's position in a time sequence. Other structures are the same as in embodiment 6.

[0268] Next, use Figure 22 The process of the scattered X-ray radiation dose calculation unit 71 in Embodiment 7 will be explained using the following flow. Figure 22 In the process, for implementation method 6 Figure 20 Processes with the same workflow are labeled with the same step numbers, and descriptions are omitted.

[0269] (Steps S101 to S104)

[0270] The scattered X-ray radiation dose calculation unit 71 performs steps S101 to S103 and step S104 in the same manner as in Embodiment 6.

[0271] (Step S701)

[0272] The camera 117 captures images, and the scattered X-ray radiation dose calculation unit 71 identifies the examinee's eyes and calculates the eye height through image processing. Alternatively, the examinee's height can be identified from the captured images, and the eye height can be calculated based on that height.

[0273] (Steps S105, S602-S603, S108-S112)

[0274] The scattered X-ray radiation dose calculation unit 71 performs steps S105, S602 to S603, and S108 to S112 in the same manner as in Embodiment 6 to calculate the scattered X-ray distribution at the height of the examinee's eye and draw it over the window 40 and the fluoroscopic imaging table.

[0275] (Step S701)

[0276] The camera 117 captures the image, and the scattered X-ray radiation dose calculation unit 71 identifies the position and orientation of the inspector.

[0277] (Steps S604 to S608)

[0278] The scattered X-ray radiation dose calculation unit 71 performs steps S604 to S608 in the same manner as in Embodiment 6 to generate cumulative radiation dose data of scattered X-rays at the examiner's position and stores it in the cumulative radiation dose data storage unit 84. Furthermore, a graph 1017 of the cumulative radiation dose data is generated and displayed together with an icon 1016 showing the examiner's position. Figure 21 That's how it's displayed.

[0279] In this embodiment 7, it is also possible to configure the system such that if the orientation of the examiner identified in step S701 is opposite to that of the X-ray generating unit 20, the cumulative radiation dose data is not accumulated.

[0280] Thus, the X-ray fluoroscopic imaging apparatus of Embodiment 7 can store the radiation dose of scattered X-rays at specific locations, such as the position of the examinee's eyes, in a time sequence and display the cumulative radiation dose. Since the examinee's position can be determined in a time sequence via the camera 117, the cumulative radiation dose can be calculated with greater accuracy. Therefore, the examinee can accurately monitor the cumulative radiation dose to their eyes (lens) and can change their standing position, thereby performing radiation exposure reduction activities.

[0281] <Implementation Method 8>

[0282] use Figures 24-25 To illustrate the X-ray fluoroscopic imaging apparatus of Embodiment 8.

[0283] The X-ray imaging apparatus of embodiment 8 has the function of confirming past accumulated data after inspection, which is present in the X-ray imaging apparatus of embodiment 6 or embodiment 7.

[0284] The structure of the X-ray fluoroscopic imaging device in Embodiment 8 is the same as that in Embodiment 6 or Embodiment 7. Furthermore, in Embodiment 6... Figure 20 The processing and implementation method 7 Figure 23 In the processing, when the scattered X-ray radiation dose calculation unit 71 stores the cumulative radiation dose data in step S606, it generates a cumulative scattered X-ray distribution image obtained by accumulating the scattered X-ray distribution drawn in step S603, and stores it in the image storage unit 8.

[0285] After the inspection, the inspector, having confirmed the accumulated data from the past, opens the management screen through the operation unit 11.

[0286] (Step S616)

[0287] In step S616, the scattered X-ray radiation dose calculation unit 71 receives the operation from the operation unit 11 to open the management screen.

[0288] (Step S617)

[0289] In step S617, the scattered X-ray radiation dose calculation unit 71 receives the selected body information 1018 from the examinee via the operation unit 11.

[0290] (Step S618)

[0291] In step S618, the scattered X-ray radiation dose calculation unit 71 displays the examinee's body information 1018, which was previously registered and stored in the image storage unit 8, on the management screen of the display unit 9 for the examinee selected in step S617. Figure 25 That's how it will be displayed.

[0292] (Steps S619, 620)

[0293] In step S619, if the scattered X-ray radiation dose calculation unit 71 has a past examination record for the examinee, it proceeds to step S620, retrieves past examination information 1019 from the cumulative radiation dose data storage unit 84, generates a summary table, and as shown... Figure 25 That's how it will be displayed.

[0294] (Step S621)

[0295] In step S621, if the examiner selects a date from past examination information, the scattered X-ray radiation dose calculation unit 71 obtains the cumulative scattered X-ray distribution and the examiner's cumulative radiation dose from the image storage unit 8 and the cumulative radiation dose data storage unit 84 for the selected date's examination.

[0296] (Steps S622, S623)

[0297] In step S622, the scattered X-ray radiation dose calculation unit 71 displays an image 1020 of the cumulative scattered X-ray distribution on the management screen of the display unit 9, and in step S623, the cumulative radiation dose 1021 of the examiner is displayed.

[0298] According to the X-ray fluoroscopic imaging device of Embodiment 8, the examiner can confirm the past distribution of scattered X-rays and the cumulative radiation dose, making it easier to plan future radiation exposure reduction activities.

Claims

1. An X-ray fluoroscopic imaging device, characterized in that, have: The X-ray generating unit irradiates the subject with X-rays. A bed table on which the subject is placed; A support portion that supports at least one of the X-ray generating unit and the bed table in a manner that allows for changes in the position and tilt. Scattered X-ray radiation dose calculation unit; and Storage Department The X-ray generating unit includes: An X-ray aperture with adjustable opening; and You can select different types of filters. The storage unit contains a table showing coefficients that represent the magnitude of the radiation dose of scattered X-rays at multiple locations arranged in a matrix within a predetermined area of ​​a certain size around the bed. The table shows the coefficients for each of the following combinations of filter type, X-ray aperture value, table, X-ray generating unit, and support unit position and tilt value. The region is the ground or a two-dimensional plane at a given height parallel to the ground. The scattered X-ray radiation dose calculation unit receives the type of the filter, the opening value of the X-ray aperture, the position and tilt value of the bed, the X-ray generating unit, and the support unit. Based on the combination of the received values ​​and referring to the table, it calculates the coefficient corresponding to the combination of the received values ​​for the plurality of positions. By multiplying the coefficient by the X-ray radiation dose irradiated by the X-ray generating unit, it calculates the scattered X-ray radiation dose at the plurality of positions on the ground around the bed or on a two-dimensional plane at a given height parallel to the ground.

2. The X-ray fluoroscopic imaging device according to claim 1, characterized in that, The scattered X-ray radiation dose calculation unit displays an image depicting the calculated scattered X-ray radiation dose distribution on a display unit, calculates the position of a specified point on the image, calculates the scattered X-ray radiation dose at that position, and displays it on the display unit.

3. The X-ray fluoroscopic imaging device according to claim 1, characterized in that, The scattered X-ray radiation dose calculation unit calculates the scattered X-ray radiation dose distribution in a two-dimensional plane parallel to the ground at the specified height above the ground within the area received by the examiner.

4. The X-ray fluoroscopic imaging device according to claim 1, characterized in that, The scattered X-ray radiation dose calculation unit calculates and displays at least one of the cumulative radiation dose accumulated over time and the average value of the scattered X-ray radiation dose per unit time.

5. The X-ray fluoroscopic imaging device according to claim 1, characterized in that, The scattered X-ray radiation dose calculation unit divides the two-dimensional plane into a given pixel size, generates an image with a color corresponding to the value of the scattered X-ray radiation dose corresponding to each pixel, and displays it. The scattered X-ray radiation dose calculation unit displays a radiation dose table showing the relationship between radiation dose and color along with the image.

6. The X-ray fluoroscopic imaging device according to claim 1, characterized in that, The scattered X-ray radiation dose calculation unit calculates the maximum radiation dose of the radiation dose scale corresponding to the type of examination received by the examinee by referring to the maximum radiation dose of a predetermined radiation dose scale for each type of examination received, and displays the obtained maximum radiation dose scale.

7. The X-ray fluoroscopic imaging device according to claim 1, characterized in that, The scattered X-ray radiation dose calculation unit receives instructions from the examiner regarding the presence and placement of X-ray shielding accessories. The table is prepared according to the presence or absence of accessories and each of the multiple positions they can be configured in. The scattered X-ray radiation dose calculation unit calculates the scattered X-ray radiation dose distribution by taking into account the type of filter, the opening value of the X-ray aperture, the position and tilt value of the table, the X-ray generating unit, and the support unit, the presence and configuration of the received accessories, and referring to the table.

8. The X-ray fluoroscopic imaging device according to claim 2, characterized in that, Point 1 refers to the inspector's position. The scattered X-ray radiation dose calculation unit calculates the scattered X-ray radiation dose at the location of the examinee, and calculates the cumulative radiation dose received by the examinee by repeatedly accumulating the previously calculated scattered X-ray radiation dose during the examination, and displays it on the display unit.

9. The X-ray fluoroscopic imaging device according to claim 8, characterized in that, The scattered X-ray radiation dose calculation unit stores the scattered X-ray radiation dose at the location of point 1 in a time series to the storage unit, and displays the scattered X-ray radiation dose in a time series as a graph, together with the cumulative radiation dose, on the display unit.

10. The X-ray fluoroscopic imaging device according to claim 8, characterized in that, The scattered X-ray radiation dose calculation unit calculates the scattered X-ray radiation dose distribution in the region at the height of a specific part of the examinee, and calculates the cumulative radiation dose for the specific part.

11. The X-ray fluoroscopic imaging apparatus according to claim 10, characterized in that, The height of the specific part is either the height input by the inspector or the height obtained by image processing from an image of the inspector captured by a camera to identify the specific part.

12. The X-ray fluoroscopic imaging device according to claim 8, characterized in that, The scattered X-ray radiation dose calculation unit uses image processing to identify the image of the inspector captured by the camera and determine the inspector's position.

13. The X-ray fluoroscopic imaging apparatus according to claim 8, characterized in that, The scattered X-ray radiation dose calculation unit stores the cumulative radiation dose of the examinee in the storage unit for each examination. The scattered X-ray radiation dose calculation unit, upon obtaining the dose from the examinee, displays the cumulative radiation dose of each examinee on the display unit.

14. The X-ray fluoroscopic imaging device according to claim 1, characterized in that, The scattered X-ray radiation dose calculation unit displays an image depicting the calculated scattered X-ray radiation dose distribution and a background image on the display unit. The background image is an image of the X-ray fluoroscopic imaging apparatus showing the position and tilt of the table, the X-ray generating unit, and the support unit as observed from the upper surface, based on the value received by the scattered X-ray radiation dose calculation unit.

15. The X-ray fluoroscopic imaging apparatus according to claim 14, characterized in that, The X-ray imaging device also has: The operation unit receives the scattered X-ray radiation dose from the operator, and the display unit displays an image depicting the scattered X-ray radiation dose distribution and the orientation of the background image.

16. A method for estimating the distribution of scattered X-rays, which is a method for estimating the distribution of scattered X-rays in an X-ray fluoroscopy imaging device, wherein the X-ray fluoroscopy imaging device has: The X-ray generating unit irradiates the subject with X-rays. A bed table on which the subject is placed; and The support portion supports at least one of the X-ray generating unit and the bed table in a manner that allows for changes in position and tilt. The X-ray generating unit is equipped with an X-ray aperture whose opening can be adjusted and a filter whose type can be selected. The method for estimating the distribution of scattered X-rays is characterized by the following steps: The type of filter, the opening value of the X-ray aperture, the position and tilt value of the table, the X-ray generating unit, and the support unit are all considered. By referring to a table showing coefficients that pre-determined coefficients representing the magnitude of the radiation dose of scattered X-rays at multiple locations arranged in a matrix within a predetermined area around the bed, based on each combination of filter type, X-ray aperture value, bed, X-ray generating unit, and support location and tilt value, the coefficients corresponding to the combinations of the received values ​​are obtained for the multiple locations. By multiplying the coefficients by the X-ray radiation dose irradiated by the X-ray generating unit, the scattered X-ray radiation dose at the multiple locations at the ground or a two-dimensional plane at a given height parallel to the ground is calculated.

17. An image processing apparatus for calculating the scattered X-ray radiation dose of an X-ray fluoroscopy imaging device, wherein the X-ray fluoroscopy imaging device comprises: The X-ray generating unit includes an X-ray aperture and a filter that can select the type of filter to irradiate the subject with X-rays; A bed table on which the subject is placed; and The support portion supports at least one of the X-ray generating unit and the bed table in a manner that allows for changes in position and tilt. The image processing device is characterized by having: The storage section contains a table showing coefficients that represent the magnitude of the radiation dose of scattered X-rays at multiple locations arranged in a matrix within a predetermined area around the table of the X-ray fluoroscopy apparatus. and Scattered X-ray radiation dose calculation unit, The table shows the coefficients for each of the following combinations of filter type, X-ray aperture value, table, X-ray generating unit, and support unit position and tilt value. The region is the ground or a two-dimensional plane at a given height parallel to the ground. The scattered X-ray radiation dose calculation unit receives the type of filter of the X-ray fluoroscopy imaging device, the value of the X-ray aperture opening, the position and tilt value of the table, the X-ray generating unit, and the support unit. Based on the combination of the received values ​​and referring to the table, it calculates the coefficient corresponding to the combination of the received values ​​for the plurality of positions. By multiplying the coefficient by the X-ray radiation dose irradiated by the X-ray generating unit, it calculates the scattered X-ray radiation dose at the plurality of positions on the ground around the table or on a two-dimensional plane at a given height parallel to the ground.

Images