WO2023012871A1 - Dispositif d'affichage de dose et programme d'affichage de dose - Google Patents

Dispositif d'affichage de dose et programme d'affichage de dose Download PDF

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WO2023012871A1
WO2023012871A1 PCT/JP2021/028637 JP2021028637W WO2023012871A1 WO 2023012871 A1 WO2023012871 A1 WO 2023012871A1 JP 2021028637 W JP2021028637 W JP 2021028637W WO 2023012871 A1 WO2023012871 A1 WO 2023012871A1
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dose
spatial
radiation
dose distribution
image
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PCT/JP2021/028637
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English (en)
Japanese (ja)
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容平 小澤
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容平 小澤
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Priority to PCT/JP2021/028637 priority Critical patent/WO2023012871A1/fr
Priority to JP2023511627A priority patent/JPWO2023012871A1/ja
Publication of WO2023012871A1 publication Critical patent/WO2023012871A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment

Definitions

  • the present invention relates to a dose display device and a dose display program.
  • Patent Document 1 an X-ray condition and a holding device position condition are acquired from an X-ray diagnostic apparatus 11, a dose distribution around the X-ray diagnostic apparatus 11 is acquired based on each acquired condition, and a monitor 61 displays an exposure dose distribution.
  • a dose monitoring system 10 is disclosed.
  • the radiation dose monitoring system 10 further detects the position of the radiation medical staff by infrared thermography, and the monitor 61 displays the dose distribution and The position of the detected radiologist is displayed.
  • the display on the monitor 61 makes it possible to confirm the positional relationship between the region where the dose of X-rays is large and the radiological medical staff in the cross section.
  • JP 2005-253689 A (for example, paragraph 0025-0053, FIG. 4)
  • the monitor 61 since the monitor 61 only displays the dose distribution and the radiation medical staff at a predetermined height, it is possible to determine the specific X-ray dose of the radiation medical staff at other heights. There was a problem that it was not possible to grasp whether the
  • the present invention was made to solve the above-mentioned problems, and aims to provide a dose display device and a dose display program that can easily grasp the dose of radiation to which an object is exposed.
  • the dose display device of the present invention comprises spatial dose distribution storage means for storing spatial dose distributions in which positions and doses of radiation at those positions are associated with each other; position acquisition means, dose acquisition means for acquiring the dose at the position of the object acquired by the position acquisition means from the spatial dose distribution stored in the spatial dose distribution storage means, and the target acquired by the dose acquisition means and dose display means for displaying the dose at the position of the object.
  • a dose display program of the present invention is a program for causing a computer having a storage unit and a display unit to execute dose display processing for displaying a dose at a position of an object, wherein the storage unit is the position and the A position acquisition step for acquiring the position of the object by operating as a spatial dose distribution storage means for storing the spatial dose distribution associated with the radiation dose at the position, and the object acquired in the position acquisition step a dose acquisition step of acquiring the dose at the position from the spatial dose distribution stored in the spatial dose distribution storage means; and a dose display for displaying the dose at the position of the object acquired in the dose acquisition step on the display unit and causing the computer to execute the steps.
  • the position of the object is acquired, the dose of radiation at the position of the object is acquired from the spatial dose distribution, and the acquired dose is displayed.
  • the dose of radiation at the position of the object is displayed, so that the dose of exposure to radiation can be easily grasped, and there is an effect that it is possible to accurately prompt measures against radiation exposure to the object.
  • the spatial dose distribution storage means stores the spatial dose distribution according to the radiation setting of the radiation generator that generates radiation.
  • the radiation setting is acquired, and the dose at the position of the object is acquired from the spatial dose distribution corresponding to the acquired setting of the radiation generating device, among the spatial dose distributions stored in the spatial dose distribution storage means.
  • the dose corresponding to the radiation output by the radiation generator can be acquired, so there is an effect that the dose can be displayed accurately.
  • the following effects are achieved.
  • a screen displaying the radiation settings of the radiation generator is captured, and the screen is analyzed to obtain the radiation settings of the radiation generator.
  • the dose at the position of the object is acquired from the spatial dose distribution corresponding to the radiation setting acquired based on the screen.
  • a display screen such as an LCD (Liquid Crystal Display), for example, a display screen such as a 7-segment LED (Light Emitting Diode) can be exemplified as the "screen for displaying the radiation setting of the radiation generator".
  • LCD Liquid Crystal Display
  • a display screen such as a 7-segment LED (Light Emitting Diode) can be exemplified as the "screen for displaying the radiation setting of the radiation generator”.
  • the spatial dose distribution storage means stores, for each body type of the patient, a spatial dose distribution including scattered rays scattered by the patient from the radiation emitted from the radiation generator to the patient. Then, among the spatial dose distributions stored in the spatial dose distribution storage means, the dose at the position of the object is obtained from the spatial dose distribution corresponding to the body type of the patient to be irradiated. As a result, the dose obtained from the spatial dose distribution can take into account the effect of scattered radiation due to the body shape of the patient being irradiated, so the dose can be displayed more accurately. be.
  • the spatial dose distribution storage means stores a spatial dose distribution including scattered rays that are scattered by specific parts of the patient from the radiation emitted from the radiation generator to the patient, for each part of the patient. Then, among the spatial dose distributions stored in the spatial dose distribution storage means, the dose at the position of the object is obtained from the spatial dose distribution corresponding to the patient's site irradiated with the radiation. As a result, the dose obtained from the spatial dose distribution can take into account the effect of scattered radiation from the part of the patient irradiated with radiation, so that the dose can be displayed more accurately. be.
  • a dose image which is an image corresponding to the magnitude of the dose at the position of the object obtained by the dose obtaining means, is displayed superimposed on the image of the object.
  • the following effects are achieved.
  • displaying a color scale or gray scale according to the magnitude of the dose as a dose image it is possible to clearly and easily grasp the areas of the target that are exposed to high doses and the low doses. There is an effect that it is possible to promote measures against radiation exposure to objects.
  • the dose display device of claim 8 in addition to the effects of the dose display device of claim 6 or 7, the following effects are achieved.
  • the image of the object and the dose image are displayed with their left and right positions reversed. Therefore, when the object is opposed to the image of the object and the dose image, there is a one-to-one relationship between the actual position of the object and the position of the object in these images. Therefore, it is possible to more intuitively grasp which part of the object is exposed to a large dose.
  • the dose display means displays the X-ray dose at the position of the radiation worker. As a result, it is possible to easily grasp the dose of X-rays that radiation workers are exposed to in treatment using X-rays, so there is an effect that the doses that radiation workers are exposed to can be easily managed.
  • the same effect as the dose display device according to claim 1 can be obtained.
  • FIG. 4 is a flowchart of main processing; It is a flow chart of dose distribution creation processing. It is a figure explaining verification of spatial dose distribution.
  • FIG. 6 is a flowchart of dose distribution display processing;
  • (a) is a flowchart of air dose distribution correction processing,
  • (b) is a diagram showing the imaging unit before movement and the air dose distribution, and
  • (c) is an imaging unit after movement and the corrected space. It is a figure showing dose distribution.
  • (a) is a flowchart of dose acquisition processing,
  • (b) is a diagram for explaining acquisition of an actual position in the X-axis direction from a depth range image, and
  • (c) is an actual dose acquisition process from a depth range image. is a diagram for explaining acquisition of a position in the Y-axis direction of .
  • FIG. 1 is a schematic diagram of a dose display device 1 in this embodiment.
  • the dose display device 1 is a device that displays the dose of radiation that the radiation worker Hw is exposed to.
  • radiation workers Hw (hereinafter abbreviated as “workers Hw”) refer to medical workers such as doctors, radiological technologists, and nurses who are engaged in diagnosis and treatment using X-rays in the treatment room R, A worker who works in an environment where radiation exists, such as in a reactor building, factory, or airport.
  • “X-ray” is exemplified as the radiation for which the dose display device 1 displays the dose.
  • a particle beam may also be used.
  • the dose display device 1 is provided with an LCD (Liquid Crystal Display) 2 that displays the dose of X-rays to which the worker Hw is exposed, a keyboard 3 that inputs instructions to the dose display device 1, and an imaging unit 4. be done.
  • the imaging unit 4 is a device that is arranged in the treatment room R and acquires an image in the imaging range Ca and a depth-distance image in the imaging range Ca.
  • a depth-and-distance image is an image in which the distance (depth) in the depth direction (Z-axis direction) between the object photographed at that pixel and the photographing unit 4 is stored for each pixel constituting the image.
  • the photographing range Ca is a range of 70° in the horizontal direction and 55° in the vertical direction centering on the photographing unit 4, but may be a range other than this.
  • the X-ray diagnostic apparatus 20 is an apparatus for capturing an X-ray image using X-rays, and includes a holding device 20a fixed to the floor of the treatment room R, a C-arm 20b, an X-ray generator 20c, and an X-ray generator 20c.
  • a line detection device 20d is provided.
  • the C-arm 20b is a C-shaped (arc-shaped) member that is rotatably provided on the holding device 20a.
  • the X-ray generator 20c is a device that is provided at one end of the C-arm 20b and that generates X-rays from an X-ray tube provided inside.
  • the X-ray detector 20d is provided at the other end of the C-arm 20b and detects X-rays.
  • the C-arm 20b, the X-ray generator 20c and the X-ray detector 20d are arranged so that the patient Pa lying on the bed 30 can be positioned between the X-ray generator 20c and the X-ray detector 20d.
  • the X-rays generated by the X-ray generator 20c and transmitted through the patient Pa are detected by the X-ray detector 20d, and an X-ray image is created based on the detected X-rays.
  • the dose display device 1 of this embodiment is configured so as to be able to display mainly the dose of X-rays to which the worker Hw is exposed.
  • the height and position of the imaging unit 4 are adjusted so that the worker Hw is included in the imaging range Ca.
  • the photographing unit 4 photographs an image within the photographing range Ca including the worker Hw and a depth distance image. For each pixel of the captured depth-and-distance image, the position at that pixel is obtained from the depth corresponding to that pixel, and the X-ray dose at that position is obtained.
  • the dose display device 1 stores a spatial dose distribution in which a position relative to the imaging unit 4 and the X-ray dose at that position are stored in association with each other. be done. For each pixel of the depth-and-distance image captured by the imaging unit 4, the dose is obtained by referring to the spatial dose distribution for the position corresponding to the pixel.
  • an image obtained by displaying the dose obtained for each pixel of the depth-and-distance image according to the magnitude of the dose and an actual image including the worker Hw photographed by the photographing unit 4 are displayed on the LCD 2 as the display screen G. to be displayed.
  • the display screen G will be described with reference to FIG. 2(a).
  • FIG. 2(a) is a diagram for explaining the display screen G.
  • a dose display image Pt1 which is an image that displays the magnitude of the dose acquired based on the above-described depth-distance image with a color scale, and an actual image including the worker Hw photographed by the photographing unit 4, are displayed.
  • the dose display image Pt1 is displayed on the left side of the display screen G
  • the actual image Pt2 is displayed on the right side of the display screen G. good.
  • the dose display image Pt1 the X-ray dose obtained for each pixel of the depth-range image is displayed on a color scale that is color-coded according to its size. Specifically, the magnitude of the X-ray dose and the color to be displayed are associated in advance, and the color corresponding to the magnitude of the X-ray dose obtained at each pixel of the depth-range image is displayed. .
  • the dose display image Pt1 is color-coded according to the color scale, and is represented by different hatching.
  • the dose display image Pt1 is created based on the depth-range image as described above, the distance to the object included in the depth-range image, for example, the distance to the worker Hw is reflected. Therefore, the image of the shape such as the contour of the worker Hw is reflected in the dose display image Pt1. As a result, in the dose display image Pt1, a color scale image (dose image) based on the dose of X-rays is superimposed on the image of the shape such as the contour of the worker Hw.
  • the magnitude of the X-ray dose to which the worker Hw is exposed can be easily grasped at a glance.
  • the actual image Pt2 is displayed next to the dose display image Pt1 on the display screen G, and by comparing these images, it is possible to specifically grasp the area where the dose is large or the area where the dose is small in the worker Hw.
  • the dose display image Pt1 and the actual image Pt2 on the display screen G are reversed in left and right positions (see FIG. 1). Therefore, when the worker Hw himself faces the LCD 2 and performs treatment while looking at the display screen G, the actual position of the worker Hw and the dose display image Pt1 and the actual image Pt2 in which the left and right positions are reversed are displayed. and the position of worker Hw displayed in , there is a one-to-one relationship. Thereby, the worker Hw can more intuitively grasp which part of himself/herself is exposed to a large amount of radiation.
  • Such a display screen G allows the worker Hw to appropriately prompt the worker Hw to take countermeasures against radiation exposure, such as moving or replacing the worker Hw, so that the worker Hw does not continue to be exposed to a large dose of radiation.
  • the display screen G is not limited to displaying both the dose display image Pt1 and the actual image Pt2, and the display of the actual image Pt2 may be omitted and only the dose display image Pt1 may be displayed.
  • the dose display image Pt1 is not limited to being displayed in a color scale according to the magnitude of the dose. , as shown in FIGS. 1 and 2(a), hatching according to the magnitude of the dose may be used.
  • the magnitude of the dose is associated with a predetermined symbol (for example, " ⁇ ”, “ ⁇ ”, “ ⁇ ”, etc.) or letter ("large”, "medium”, “small”, etc.), and the magnitude of the dose is determined. You may display the symbol and character according to. In addition to these, when the magnitude of the dose is greater than or equal to a predetermined value, the region may be blinked to further emphasize that the dose is large or small.
  • the present invention is not limited to this. good.
  • the present invention is not limited to this. good.
  • the dose display image Pt1 is created from the depth/distance image captured by the imaging unit 4 and the spatial dose distribution. 1) to generate X-rays (hereinafter referred to as "apparatus parameters").
  • device parameters are acquired from the X-ray control device 20e, which is an information processing device that controls the X-ray diagnosis device 20, in a non-contact manner.
  • FIG. 2(b) is a diagram for explaining acquisition of device parameters.
  • the X-ray control device 20e is provided with an LCD 20e1 on which device parameters used in the X-ray diagnostic device 20 are displayed.
  • the device parameters in this embodiment include the tube current, tube voltage, and tube angle of the X-ray tube that generates X-rays in the X-ray generator 20c, the size of the imaging field of the X-ray generator 20c, The tube-detector distance, which is the distance between the X-ray tube and the X-ray detection device 20d, the aperture amount of the X-ray movable aperture provided in the X-ray generation device 20c, and the X-ray generation device 20c also provided
  • the angle and the amount of movement of the movable compensation filter can be mentioned, the parameters related to the generation of X-rays other than these may be included in the device parameters, and the device parameters may be configured by omitting some of the above parameters. Also good. Further, in this embodiment, for
  • the dose display device 1 is connected to a monitor camera 5 that captures the LCD 20e1.
  • An image of the LCD 20e1 acquired from the monitor camera 5 is transmitted to the dose display device 1 at any time, and the device parameters are acquired by recognizing the transmitted image.
  • a known method such as image analysis or AI using learning data obtained by machine learning is used.
  • the spatial dose distribution corresponding to the acquired device parameters is acquired and referred to the depth range image captured by the imaging unit 4 .
  • the dose display device 1 modifies the X-ray diagnostic device 20 so that the device parameters can be acquired from the dose display device 1, without connecting the X-ray diagnostic device 20 and the dose display device 1, i.e., the existing X-ray Using the X-ray diagnostic apparatus 20, device parameters can be acquired from the X-ray diagnostic apparatus 20 in a non-contact manner.
  • the device parameters are acquired from the X-ray diagnostic device 20 via the monitor camera 5 at any time, even if the device parameters change due to changes in the conditions of the X-rays irradiated to the patient Pa, the changes It is possible to obtain the spatial dose distribution according to the set device parameters. As a result, the dose corresponding to the changed apparatus parameter is reflected in the dose display image Pt1, so that the dose can be displayed more accurately by the dose display image Pt1.
  • Acquisition of apparatus parameters from the X-ray diagnostic apparatus 20 is not limited to the above. You may check the device parameters displayed in the , and input them via the keyboard 3 of the dose display device 1 .
  • FIG. 3 is a block diagram showing the electrical configuration of the dose display device 1.
  • the dose display device 1 has a CPU 10 , a hard disk drive (hereinafter abbreviated as “HDD”), and a RAM 12 , which are connected to an input/output port 14 via a bus line 13 .
  • the input/output port 14 is further connected with the LCD 2 , the keyboard 3 , the imaging unit 4 , the monitor camera 5 , and the dosimeter 6 .
  • the CPU 10 is an arithmetic device that controls each unit connected by the bus line 13 .
  • the flash ROM 11 is a rewritable non-volatile storage device that stores programs executed by the CPU 10, fixed value data, etc., and stores a dose display program 11a, a spatial dose distribution table 11b, and an angle of view table 11c. be.
  • the space dose distribution table 11b is a data table that stores the above-described space dose display
  • the view angle table 11c is a data table that stores the view angles of the pixels of the depth range image.
  • FIG. 4(a) is a diagram schematically showing the air dose distribution table 11b.
  • the spatial dose distribution table 11b stores the spatial dose distribution according to the body type of the patient Pa and the apparatus parameters of the X-ray diagnostic apparatus 20.
  • FIG. Specifically, the spatial dose distribution table 11b includes, for each body type of the patient Pa to be irradiated with X-rays, a first spatial dose distribution table 11b1 for thin type, a second spatial dose distribution table 11b2 for medium thickness, A third space dose distribution table 11b3 for obesity, . . . is provided.
  • the first spatial dose distribution table 11b1 and the like are not distinguished, they are referred to as "spatial dose distribution table 11bm".
  • the spatial dose distribution table 11bm includes apparatus parameters (specifically, tube current, tube voltage, tube-detector distance, tube angle, size of imaging field, aperture amount of X-ray movable aperture (in the figure, Storage of spatial dose distributions D1, D2, . be done.
  • apparatus parameters specifically, tube current, tube voltage, tube-detector distance, tube angle, size of imaging field, aperture amount of X-ray movable aperture (in the figure, Storage of spatial dose distributions D1, D2, . be done.
  • apparatus parameters specifically, tube current, tube voltage, tube-detector distance, tube angle, size of imaging field, aperture amount of X-ray movable aperture
  • FIG. 4(b) is a diagram schematically showing the air dose distribution D1.
  • the spatial dose distribution D1 will be described here as an example, the spatial dose distributions D2, D3, .
  • the dose at that position is stored in the spatial dose distribution D1.
  • the X-axis direction is the horizontal direction of an imaging unit that captures a depth-distance image or the like in the imaging unit 4
  • the Y-axis direction is the vertical direction in the imaging unit
  • the Z-axis direction is the depth direction in the imaging unit.
  • doses are stored for each position in the Z-axis direction (Z1, Z2, Z3, .
  • the dose according to the combination of the position in the Y-axis direction and the position in the Z-axis direction may be stored for each position in the X-axis direction, or the combination of the position in the X-axis direction and the position in the Z-axis direction for each position in the Y-axis direction. can be stored.
  • FIG. 4(c) is a diagram schematically showing the angle-of-view table 11c.
  • the angle-of-view table 11c stores, for each pixel of the depth-and-distance image captured by the imaging unit 4, the angle of view corresponding to that pixel.
  • a horizontal angle of view and a vertical angle of view are stored for each position in the horizontal direction (X-axis direction) and vertical direction (Y-axis direction) of the pixel of the depth-range image.
  • the coordinate of the left end position in the X-axis direction is Xa, and as it moves rightward from the left end position, the coordinate in the X-axis direction becomes Xb, Xc, . and change in order.
  • the coordinate of the upper end position in the Y-axis direction is Ya, and as it moves downward from the upper end position, the coordinate in the Y-axis direction changes in order of Yb, Yc, . .
  • the angle of view table 11c stores the angle of view in the format of "(horizontal angle of view)/(vertical angle of view)".
  • the shooting range Ca of the shooting unit 4 of this embodiment has a range of 70° in the horizontal direction and 55° in the vertical direction around the shooting unit 4.
  • the position in the X-axis direction is Xa and the Y-axis "35°/27.5°" is stored in the angle-of-view table 11c as the angle of view when the position of the direction is Ya.
  • the depth distance image stores the distance in the depth direction for each pixel, in other words, the position in the depth direction (Z-axis direction) with respect to the imaging unit 4 is stored.
  • the actual position of the pixel in the X-axis direction and the Y-axis direction can be obtained.
  • the RAM 12 is a memory for rewritably storing various work data, flags, etc. when the CPU 10 executes the dose display program 11a. 12b, a patient body shape memory 12c that stores the body shape of the patient Pa, a depth distance image memory 12d that stores a depth distance image, an apparatus parameter memory 12e that stores the above apparatus parameters, and a spatial dose distribution. and a dose memory 12g that stores the position of each pixel in the depth-range image and the magnitude of the dose in association with each other.
  • the imaging unit 4 includes a depth camera 4a that captures a depth-and-distance image in the imaging range Ca in FIG.
  • a displacement sensor 4c composed of a velocity meter and an angular velocity meter is provided.
  • a plurality of dosimeters 6 are provided on a detection plate B in FIG. 7, which will be described later, and are sensors for measuring the dose of X-rays.
  • the plurality of dosimeters 6 are represented as one dosimeter 6 .
  • FIG. 5 is a flowchart of main processing.
  • the main process is a process that is executed after power-on of the dose display device 1 .
  • the main process first confirms the operation mode input from the keyboard 3 (S1).
  • the operation modes are a "dose distribution creation mode” for creating a spatial dose distribution, and a “dose display mode” for displaying a dose display image Pt1 and an actual image Pt2 (see FIG. 2(a)) on the LCD 2. is provided.
  • the dose distribution creation process (S2) is executed.
  • S1 dose distribution creation mode
  • S2 dose distribution creation mode
  • FIG. 6 is a flowchart of dose distribution creation processing.
  • a counter variable M representing the body type of the patient Pa is set to 1 (S10).
  • the counter variable M is a value corresponding to the body type of the spatial dose distribution table 11bm described above in FIG. When M is 3, the body type of patient Pa is obese.
  • 1 is set to the counter variable N representing the position (index) of the target device parameter in the air dose distribution table 11bm (S11).
  • the subject model is a model of the patient Pa to be irradiated with X-rays, which is created in consideration of the constituent elements and density of the human body based on the acquired body shape information, and is created by a known method. .
  • the X-ray tube model is a model of the intensity of X-rays to be generated and the direction in which X-rays are emitted. is created by a known method based on the geometrical conditions of , the types, ratios, and densities of constituent elements (hereinafter referred to as "predetermined conditions of the X-ray tube model"). It is assumed that the predetermined conditions for the X-ray tube model are input from the keyboard 3 when the process of S13 is executed.
  • the bed model is a model of the bed 30, and the height of the bed 30 in the acquired device parameters, the geometrical conditions of the bed 30, the types and ratios of the composition elements, and the density (hereinafter referred to as "bed model It is created by a known method based on the "predetermined conditions"). Predetermined conditions for the bed model are also input via the keyboard 3 when the process of S14 is executed.
  • the device model is a model of the X-ray diagnostic device 20, and the distance between the tube and the detector in the acquired device parameters, the geometric conditions of the exterior of the X-ray diagnostic device 20, the types of composition elements, and the It is created by a known method based on the ratio and density (hereinafter referred to as "predetermined conditions of the device model"). Predetermined conditions for the device model are also input via the keyboard 3 when the process of S14 is executed.
  • a Monte Carlo simulation is performed using the created model to create an air dose distribution (S15).
  • the creation of the spatial dose distribution by Monte Carlo simulation is a known technique, and detailed description thereof will be omitted.
  • verification of the created spatial dose distribution is performed. Here, with reference to FIG. 7, an outline of the verification of the spatial dose distribution will be described.
  • FIG. 7 is a diagram explaining the verification of the air dose distribution. After being created in the process of S15 in FIG. 6, the X-ray diagnostic apparatus 20 is generated under the same conditions as when the spatial dose distribution was actually created to measure the dose, and the dose obtained by the spatial dose distribution and the measured dose It is verified that there is no deviation from the dose.
  • a plate-shaped detection plate B is provided in the treatment room R, and the plurality of dosimeters 6 described above in FIG. Also, on the bed 30, instead of the patient Pa, a model F corresponding to the M-th body type in FIG. 6 is arranged. Model F is made of a water-equivalent material in order to accurately simulate patient Pa.
  • the interval between the dosimeters 6 provided on the detection plate B is not limited to 10 cm, and may be 10 cm or less or 10 cm or more.
  • the arrangement of the dosimeters 6 provided on the detection plate B is not limited to the lattice pattern, and other arrangement methods such as a staggered pattern may be used.
  • the X-ray diagnostic apparatus 20 generates X-rays based on the N-th apparatus parameter for the M-th body type in the spatial dose distribution table 11b of FIG. Scattered radiation is detected by dosimeter 6 . At this time, the position of the dosimeter 6 is acquired by the depth camera 4 a of the imaging unit 4 .
  • the dose detected by the dosimeter 6 and the dose at the position of the dosimeter 6 acquired by the depth camera 4a acquired from the spatial dose distribution created in the process of S15 in FIG. 6 are within a predetermined range. is checked. If these doses are within a predetermined range, the created spatial dose distribution is stored in the spatial dose distribution table 11b as the spatial dose distribution for the conditions. On the other hand, if these doses are not within the predetermined range, the model other than the subject model, that is, the X-ray tube model, the bed model, or the device model, is modified to reproduce the spatial dose distribution. The above verification is performed on the created and recreated spatial dose distribution.
  • the verification process described above will be explained.
  • the distance from the depth camera 4a of the imaging unit 4 to the dosimeter 6 is acquired, and the position of the dosimeter 6 is acquired based on the distance (S16).
  • the model F of the M-th body type in the air dose distribution table 11b is placed on the bed 30, and X-rays are generated by the X-ray diagnosis apparatus 20 using the same device parameters as when the air dose distribution was created. After that, the dose is acquired from the dosimeter 6 (S17).
  • the dose corresponding to the position obtained in the process of S16 is obtained from the spatial dose distribution created in the process of S15 (S18).
  • the predetermined conditions of the X-ray tube model, the bed model, or the device model are corrected (S20), and the predetermined conditions of each corrected model are corrected.
  • the processing from S11 onward may be repeated to recreate the spatial dose distribution for all body types using the predetermined conditions of each model corrected in the processing of S20.
  • FIG. 8 is a flowchart of dose display processing.
  • the current position and current angle of the imaging unit 4 input from the keyboard 3 are acquired and stored in the unit position memory 12a and the unit angle memory 12b, respectively (S30).
  • the body shape of the patient Pa input from the keyboard 3 is obtained and stored in the patient body shape memory 12c (S31).
  • a depth distance image is acquired from the depth camera 4a and stored in the depth distance image memory 12d (S32).
  • each pixel of the depth-range image in the depth-range image memory 12d is multiplied by a predetermined calibration constant to convert the distance information of the pixel into an absolute distance from the imaging unit 4 (S33).
  • an image including device parameters displayed on the LCD 20e1 (FIG. 2(b)) of the X-ray control device 20e is acquired from the monitor camera 5 (S34).
  • device parameters are acquired from the acquired image and stored in the device parameter memory 12e (S35).
  • the spatial dose distribution corresponding to the body type of the patient body type memory 12c and the device parameters of the device parameter memory 12e is acquired from the spatial dose distribution table 11b and stored in the spatial dose distribution memory 12f (S36).
  • the air dose distribution correction process (S37) is executed.
  • the spatial dose distribution correction processing will be described with reference to FIG.
  • FIG. 9(a) is a flowchart of spatial dose distribution correction processing.
  • the air dose distribution correction process first acquires the amount of movement and the amount of rotation per unit time from the velocity and angular velocity acquired from the displacement sensor 4c (S50). After the process of S50, the obtained movement amount and rotation amount are added to the unit position memory 12a and the unit angle memory 12b, respectively (S51). As a result, the amount of deviation from the unit position memory 12a and the unit angle memory 12b at the time of input in the process of S30 in FIG. 8 is reflected in the unit position memory 12a and the unit angle memory 12b.
  • the spatial dose distribution in the spatial dose distribution memory 12f is corrected based on the respective values of the unit position memory 12a and the unit angle memory 12b (S52), and the spatial dose distribution processing ends.
  • the correction of the air dose distribution in the process of S52 will be described using FIGS. 9(b) and (c).
  • FIG. 9(b) is a diagram showing the imaging unit 4 before movement and the spatial dose distribution
  • FIG. 9(c) is a diagram showing the imaging unit 4 after movement and the corrected spatial dose distribution
  • 9B and 9C show the position of the imaging unit 4 as well as the dose at each position as a spatial dose distribution.
  • the imaging range Ca in the air dose distribution Regions may occur that do not contain a valid dose at that location.
  • the spatial dose distribution is corrected so that the dose in regions not containing effective doses (for example, the left end and the lower end of FIG. 9(c)) becomes “0”. .
  • the imaging range Ca is included in an area that does not contain an effective dose in the spatial dose distribution of the spatial dose distribution memory 12f, acquisition of an incorrect dose value is suppressed. , it is possible to suppress display of an incorrect dose in the dose display image Pt1.
  • FIG. 10(a) is a flowchart of dose acquisition processing.
  • Xa which is the left end position of the depth-range image
  • Ya which is the left end position of the depth range image
  • yn representing the position of the depth range image in the Y-axis direction of the depth range image memory 12d
  • the pixel value at the coordinates (xn, yn) of the depth-range image in the depth-range image memory 12d is obtained and substituted for the variable d (S62).
  • the horizontal and vertical angles of view of the coordinates (xn, yn) in the angle of view table 11c are obtained and set as the horizontal angle ⁇ and the vertical angle ⁇ , respectively (S63).
  • d ⁇ tan( ⁇ ) is set at the position xn'
  • d ⁇ tan( ⁇ ) is set at the position yn' (S64).
  • the positions xn' and yn' set in the process of S64 will be described with reference to FIGS. 10(b) and 10(c).
  • FIG. 10(b) is a diagram for explaining acquisition of the actual X-axis direction position xn′ from the depth range image
  • FIG. 10(c) is a diagram illustrating the actual Y-axis direction position yn ' is a diagram for explaining acquisition of .
  • the variable d acquired in the process of S62 represents the pixel value of the coordinates (xn, yn) of the depth-range image in the corresponding depth-range image memory 12d, that is, the actual position of the pixel in the depth direction (Z-axis direction).
  • . xn′ obtained by multiplying the variable d by the tangent value (tan( ⁇ )) of the horizontal angle ⁇ , which is the corresponding horizontal angle of view, in the Z-axis direction from the imaging unit 4, as shown in FIG. It is defined as the amount of deviation in the X-axis direction according to the horizontal angle ⁇ from the position distant by the distance d. Therefore, the position xn' is the actual position of the pixel in the X-axis direction.
  • yn' obtained by multiplying the variable d by the tangent value (tan( ⁇ )) of the vertical angle ⁇ , which is the corresponding vertical angle of view, is the Z-axis distance from the imaging unit 4, as shown in FIG.
  • yn' is the actual position of the pixel in the Y-axis direction, since it is the amount of deviation in the Y-axis direction corresponding to the vertical angle of view (horizontal angle ⁇ ) from the position at the distance d in the direction.
  • the dose corresponding to the coordinates (xn', yn', d) is acquired from the spatial dose distribution in the spatial dose distribution memory (S65). At this time, if the spatial dose distribution does not store the dose at the position that matches the coordinates (xn', yn', d), the coordinates (xn', yn', d) are stored in the spatial dose distribution. The dose of the position closest to d) is obtained.
  • the dose acquisition method when the dose at the position that matches the coordinates (xn', yn', d) is not stored in the spatial dose distribution is not limited to this, for example, the position stored in the spatial dose distribution Among them, even if the dose at the position around the coordinates (xn', yn', d) is acquired and the average value or median value of the acquired doses is acquired as the dose at the coordinates (xn', yn', d) good.
  • the acquired dose is saved as the dose at the coordinates (xn, yn) in the dose memory 12g (S66).
  • the dose memory 12g stores the corresponding dose for each pixel of the depth-range image in the depth-range image memory 12d.
  • the position yn is advanced by one (S67), and it is confirmed whether the position yn has exceeded the lower end of the depth range image in the depth range image memory 12d (S68).
  • S68 if the position yn does not exceed the lower end (S68: No), the processing from S62 onwards is repeated.
  • S69 if the position yn exceeds the lower end (S68: Yes), the position xn is advanced by one (S69), and whether the position xn exceeds the right end of the depth range image in the depth range image memory 12d. is confirmed (S70).
  • a dose display image Pt1 is created based on the dose stored in the dose memory 12g (S39). After the process of S39, an image obtained by reversing the left and right positions of the created dose display image Pt1 and an image obtained by reversing the left and right positions of the actual image Pt2 acquired from the operator's camera 4b are displayed on the LCD 2 (S40 ), and the processing from S32 onward is repeated.
  • the dose display device 1 of the present embodiment acquires a depth distance image including the worker Hw from the depth camera 4a, and the spatial dose distribution according to the device parameters of the X-ray diagnostic device 20 and the body shape of the patient Pa. is obtained from the air dose distribution table 11b.
  • the dose at the position corresponding to each pixel of the depth-range image is acquired from the acquired depth-range image and the spatial dose distribution.
  • a dose display image Pt1 is created and displayed on the LCD 2 by displaying the acquired dose on a color scale according to its size.
  • the spatial dose distribution table 11b stores device parameters and spatial dose distribution according to the body type of the patient Pa.
  • a spatial dose distribution is acquired according to the body type of the patient Pa who is sitting.
  • the spatial dose distribution that takes into account the influence of the X-rays output according to the device parameters of the X-ray diagnostic apparatus 20 and the X-ray scattered rays according to the body type of the patient Pa to whom the X-rays are irradiated. Therefore, the display of the dose of the dose display image Pt1 can be made more accurate.
  • the spatial dose distribution is created for each body type of the patient Pa in the spatial dose distribution table 11b, but the present invention is not limited to this.
  • the spatial dose distribution is created for each site (head, trunk, etc.) of the patient Pa to be irradiated with X-rays by the X-ray diagnostic apparatus 20, and the spatial dose distribution of the site where the patient Pa is actually irradiated with X-rays is obtained. You may acquire and acquire a dose. Scattered radiation when the patient Pa is irradiated with X-rays varies depending on the site irradiated with the X-rays.
  • the spatial dose distribution table 11b may store the spatial dose distribution corresponding to the body type and body part of the patient Pa, or the spatial dose distribution table 11b may store the spatial dose distribution independent of body type and body part. good.
  • the dose according to the position of each pixel in the depth-range image is acquired from the spatial dose distribution created in advance and displayed, but the present invention is not limited to this.
  • the worker Hw is equipped with a dosimeter, and the dose displayed from the air dose distribution is compared with the dose acquired from the worker Hw's dosimeter.
  • the dose stored in the distribution may be updated with the dose obtained with the dosimeter.
  • protective equipment that reduces X-rays such as protective glasses worn by worker Hw
  • protective equipment that reduces X-rays is not taken into consideration, but it is not limited to this.
  • X By multiplying by a coefficient according to the line reduction capability, the reduced dose may be reflected in the dose display image Pt1.
  • the ability of the protective equipment to reduce X-rays can be grasped at a glance from the dose display image Pt1.
  • a dosimeter is placed between the protective equipment and the worker Hw, such as inside the protective glasses, and the dose is obtained by the dosimeter. You may display the mitigation ability of
  • the spatial dose distribution is not distinguished between the case of taking an X-ray photograph by the X-ray diagnostic apparatus 20 and the case of creating a moving image (fluoroscopy) based on the X-ray photograph.
  • Different spatial dose distributions may be prepared for taking X-ray photographs and for creating moving images, and appropriate spatial dose distributions may be used in each case.
  • the LCD 20e1 see FIG. 2B
  • the case of taking an X-ray photograph in the X-ray diagnostic apparatus 20 and the case of creating a moving image are displayed separately. It may be determined from the captured image of the LCD 20e1 whether to take an X-ray photograph or to create a moving image.
  • the dose display image Pt1 displays only a color scale as an indication of the magnitude of the dose, but is not limited to this.
  • the cumulative value of the dose and the dose per unit time for each worker Hw to be displayed may be displayed by numerical values, graphs, or the like.
  • the cumulative value of the dose for each part (eyes, mouth, etc.) of the worker Hw and the dose per unit time may be displayed by numerical values, graphs, or the like.
  • the depth image is acquired by the depth camera 4a, and the positions of the workers Hw and the like are acquired, but the present invention is not limited to this.
  • the position of the worker Hw may be obtained by analyzing the image acquired by the operator camera using image processing or AI, or the position of the worker Hw may be obtained using the sampling moire method. You can get the position.
  • the position of the worker Hw may be obtained by LiDAR (Light Detection And Ranging), or the position of the worker Hw may be obtained by using ultrasonic waves.
  • the body shape of the patient Pa is acquired from the keyboard 3 in the dose display process of FIG. 8, but it is not limited to this.
  • the body shape of the patient may be acquired by analyzing images acquired by the depth camera 4a or the operator's camera.
  • the spatial dose distribution was created by Monte Carlo simulation using each model, but the spatial dose distribution is not limited to this, and may be created by other simulation techniques.
  • a model F is placed on a bed 30 as shown in FIG. In this state, the spatial dose distribution may be created by actual measurement by acquiring the dose with the dosimeter 6 provided on the detection plate B while moving the detection plate B by minute distances (for example, 1 cm).
  • the subject model is created in the process of S12 based on the information of the M-th body type in the spatial dose distribution table 11bm, and the spatial dose distribution created using the subject model is By comparing the dose obtained by the dosimeter 6 with the model F corresponding to the M-th body type placed on the bed 30 in the processing of S19, and correcting the predetermined conditions such as the X-ray tube model in the processing of S20, Although the spatial dose distribution was created, it is not limited to this.
  • a subject model is created based on a model F having a predetermined size and shape (for example, a cubic shape with one side of 500 mm). Air dose distribution” will be created.
  • the X-ray tube model, the bed model, and the device model for creating the "temporary spatial dose distribution" shall be created according to the N-th device parameter for the M-th body type in the spatial dose distribution table 11bm. do.
  • the created “temporary spatial dose distribution” is compared with the dose acquired by the dosimeter 6 with the model F of a predetermined size and shape placed on the bed 30, and By correcting predetermined conditions such as the X-ray tube model in the process, a "temporary spatial dose distribution" with a small difference from the dose obtained by the dosimeter 6 is created.
  • a subject model is created based on the information of the M-th body type in the spatial dose distribution table 11bm, and the created subject model and the X-ray tube model, the bed model, and the device when creating the "provisional spatial dose distribution"
  • a spatial dose distribution is created from the model as in the process of S15.
  • the created spatial dose distribution may be stored in the spatial dose distribution table 11bm as the Nth spatial dose distribution for the Mth body type.
  • the device parameters used in the X-ray diagnostic device 20 are displayed on the LCD 20e1, but the present invention is not limited to this.
  • the X-ray diagnostic apparatus 20 may be provided with a plurality of 7-segment LEDs (Light Emitting Diodes), and each value of the apparatus parameter may be displayed on the 7-segment LEDs.
  • the monitor camera 5 should be arranged so that the contents displayed on the 7-segment LED can be photographed.
  • the radiation worker Hw was exemplified as an object included in the imaging range Ca, but the object is not limited to this. It may also be used as an electronic device such as a computer or a precision instrument that is susceptible to damage.
  • the spatial dose distribution is created in consideration of the X-rays (primary radiation) generated according to the device parameters and the scattered rays of the X-rays, but it is not limited to this.
  • the spatial dose distribution may be created considering only primary radiation, or may be created considering only scattered radiation.
  • the dose display device 1 is a device that displays the dose of radiation that the worker Hw (radiation worker Hw) is exposed to, but it is not limited to this.
  • the dose display device 1 may be a device that displays the radiation dose to which a non-radiation worker such as a patient Pa undergoing an examination or treatment or a tourist undergoing an X-ray physical examination at an airport is exposed.
  • both the dose creation mode and the dose display mode are provided as the operation modes in FIG. 5, but the present invention is not limited to this.
  • the operation mode may be only the dose generation mode or only the dose display mode.
  • the dose display device 1 was exemplified as a device that executes the dose display program 11a, but it is not limited to this.
  • the dose display program 11a may be executed by an information processing device such as a PC, a smart phone, or a tablet terminal.

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Abstract

L'invention concerne un dispositif d'affichage de dose et un programme d'affichage de dose grâce auxquels il est possible de déterminer facilement la dose de rayonnement auquel un sujet est exposé. Ce dispositif d'affichage de dose 1 acquiert une image de distance de profondeur comprenant un travailleur Hw à partir d'une caméra de profondeur 4a, et acquiert le paramètre de dispositif d'un dispositif de radiodiagnostic 20 et la distribution de dose spatiale correspondant à la forme corporelle d'un patient Pa à partir d'une table de distribution de dose spatiale 11b. Une dose à une position correspondant à chaque pixel de l'image de distance de profondeur est acquise pour chaque pixel à partir de l'image de distance de profondeur acquise et de la distribution de dose spatiale. La dose acquise est affichée en échelle de gris en fonction de l'amplitude de celle-ci, créant ainsi une image d'affichage de dose Pt1 qui est affichée sur un LCD 2. En conséquence, la dose de rayons X à une position du travailleur Hw est affichée, et par conséquent la dose à laquelle le travailleur Hw est exposé par des rayons X peut facilement être déterminée, et des contre-mesures d'exposition pour le travailleur Hw peuvent être déclenchées avec précision.
PCT/JP2021/028637 2021-08-02 2021-08-02 Dispositif d'affichage de dose et programme d'affichage de dose WO2023012871A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009213709A (ja) * 2008-03-11 2009-09-24 Toshiba Corp 吸収線量管理装置
JP2019080728A (ja) * 2017-10-30 2019-05-30 キヤノンメディカルシステムズ株式会社 放射線量管理装置及び放射線量管理方法
US20190365339A1 (en) * 2017-01-17 2019-12-05 Koninklijke Philips N.V. Augmented reality interventional system providing contextual overylays

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009213709A (ja) * 2008-03-11 2009-09-24 Toshiba Corp 吸収線量管理装置
US20190365339A1 (en) * 2017-01-17 2019-12-05 Koninklijke Philips N.V. Augmented reality interventional system providing contextual overylays
JP2019080728A (ja) * 2017-10-30 2019-05-30 キヤノンメディカルシステムズ株式会社 放射線量管理装置及び放射線量管理方法

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