WO2023068230A1 - 制御装置、制御方法、及び制御プログラム - Google Patents

制御装置、制御方法、及び制御プログラム Download PDF

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Publication number
WO2023068230A1
WO2023068230A1 PCT/JP2022/038616 JP2022038616W WO2023068230A1 WO 2023068230 A1 WO2023068230 A1 WO 2023068230A1 JP 2022038616 W JP2022038616 W JP 2022038616W WO 2023068230 A1 WO2023068230 A1 WO 2023068230A1
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Prior art keywords
radiation
area
amount
control
irradiation
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Ceased
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PCT/JP2022/038616
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English (en)
French (fr)
Japanese (ja)
Inventor
佑司 池田
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Fujifilm Corp
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Fujifilm Corp
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Priority to CN202280070380.9A priority Critical patent/CN118119339A/zh
Priority to EP22883534.4A priority patent/EP4420610A4/en
Priority to JP2023554679A priority patent/JPWO2023068230A1/ja
Publication of WO2023068230A1 publication Critical patent/WO2023068230A1/ja
Priority to US18/632,295 priority patent/US20240268780A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • A61B6/58—Testing, adjusting or calibrating thereof
    • A61B6/582—Calibration
    • 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
    • A61B6/54—Control of apparatus or devices for radiation diagnosis
    • A61B6/545—Control of apparatus or devices for radiation diagnosis involving automatic set-up of acquisition parameters
    • 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
    • A61B6/58—Testing, adjusting or calibrating thereof
    • A61B6/587—Alignment of source unit to detector unit
    • 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
    • A61B6/06—Diaphragms
    • 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
    • A61B6/44—Constructional features of apparatus for radiation diagnosis
    • A61B6/4429—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units
    • A61B6/4435—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units the source unit and the detector unit being coupled by a rigid structure
    • A61B6/4441—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units the source unit and the detector unit being coupled by a rigid structure the rigid structure being a C-arm or U-arm
    • 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
    • A61B6/46—Arrangements for interfacing with the operator or the patient
    • A61B6/461—Displaying means of special interest
    • 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
    • A61B6/46—Arrangements for interfacing with the operator or the patient
    • A61B6/467—Arrangements for interfacing with the operator or the patient characterised by special input means
    • A61B6/469—Arrangements for interfacing with the operator or the patient characterised by special input means for selecting a region of interest [ROI]
    • 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
    • A61B6/54—Control of apparatus or devices for radiation diagnosis
    • A61B6/542—Control of apparatus or devices for radiation diagnosis involving control of exposure

Definitions

  • the present disclosure relates to a control device, control method, and control program.
  • Japanese Patent Application Laid-Open No. 2020-185145 discloses a technique for controlling a collimator to expand the X-ray irradiation area after the region of interest is highlighted in the region of interest enhancement mode in X-ray imaging.
  • Japanese Patent Application Laid-Open No. 2013-094501 discloses that in radiographic imaging, a collimator is controlled so that the irradiation field of radiation becomes a region of interest during video imaging, and after the end of video imaging, the irradiation field of radiation is a movement path of the region of interest.
  • a technique is disclosed in which a still image is captured by controlling a collimator so as to include all .
  • blurring may occur at the outer edge of the radiographic image.
  • the generated blurred portion may reach the subject portion in the radiographic image, and the image quality of the subject portion in the radiographic image may be degraded.
  • the present disclosure has been made in view of the above circumstances, and aims to provide a control device, a control method, and a control program capable of suppressing deterioration in image quality of a subject portion in a radiographic image.
  • a control device of the present disclosure includes at least one processor and controls an irradiation field of radiation irradiated to a radiation detector, wherein the processor controls radiation required when radiographic images are captured.
  • the first control amount which is the amount of expanding the irradiation field outside the required irradiation area when the required irradiation area, which is the irradiation area of , is the maximum area detectable by the radiation detector, is set to the maximum area. It is made smaller than the second control amount, which is the amount by which the irradiation field is expanded to the outside of the required irradiation area when it is inside the required irradiation area.
  • the first The controlled variable and the second controlled variable may be the same amount.
  • the area of the irradiation field expanded according to the second control amount may be less than or equal to the area of the irradiation field expanded according to the first control amount.
  • the radiation detection surface of the radiation detector is rectangular, and the first control amount and the second control amount are set corresponding to each side of the detection surface. good.
  • the processor locates a region to be subjected to image analysis when controlling the dose of radiation with respect to the radiation image obtained according to the first control amount or the second control amount. It may be set inside the fixed quantity.
  • the radiographic image may be rectangular, and the predetermined amount may be set corresponding to each side of the radiographic image.
  • the processor may make the predetermined amount of the radiographic image obtained according to the first control amount smaller than the predetermined amount of the radiographic image obtained according to the second control amount.
  • control device of the present disclosure when the requested irradiation region is inside the maximum region, the processor sets in advance a portion outside the requested irradiation region in the radiographic image obtained according to the second control amount.
  • control may be performed to perform image processing for filling in a different color, and to display the radiographic image that has undergone image processing on the display.
  • a control method of the present disclosure is a control method executed by a processor of a control device that includes at least one processor and controls an irradiation field of radiation irradiated to a radiation detector, the control method comprising: A first control amount, which is an amount by which the irradiation field is expanded outside the requested irradiation area when the requested irradiation area, which is the irradiation area of the radiation requested at the time, is the maximum area that can be detected by the radiation detector, It is made smaller than the second control amount, which is the amount by which the irradiation field is expanded outside the required irradiation area when the required irradiation area is inside the maximum area.
  • control program of the present disclosure is a control program that is executed by a processor of a control device that includes at least one processor and controls an irradiation field of radiation irradiated to a radiation detector, the control program comprising: A first control amount that is an amount by which the irradiation field is expanded outside the required irradiation area when the required irradiation area, which is the radiation irradiation area required for imaging, is the maximum area that can be detected by the radiation detector. is smaller than the second control amount, which is the amount by which the irradiation field is expanded outside the required irradiation area when the required irradiation area is inside the maximum area.
  • deterioration in image quality of the subject portion in the radiographic image can be suppressed.
  • FIG. 4 is a perspective view of the irradiation field limiter viewed from the front side where radiation is incident;
  • FIG. 2 is a perspective view of the radiation detector viewed from the front side on which radiation is incident;
  • It is a block diagram which shows an example of the hardware constitutions of a control apparatus.
  • FIG. 4 is a schematic diagram for explaining blurring that occurs in a radiographic image when radiation is applied without tilting the anode of the radiation source;
  • FIG. 4 is a schematic diagram for explaining blurring that occurs in a radiographic image when radiation is irradiated with the anode of the radiation source tilted.
  • FIG. 4 is a perspective view of the irradiation field limiter viewed from the front side where radiation is incident;
  • FIG. 2 is a perspective view of the radiation detector viewed from the front side on which radiation is incident;
  • It is a block diagram which shows an example of the hardware constitutions of a control apparatus.
  • FIG. 4 is a schematic diagram for explaining blurring that
  • FIG. 4 is a plan view for explaining the amount of deviation between an irradiation field of radiation and a detection surface of a radiation detector;
  • FIG. 4 is a perspective view for explaining a first control amount of an irradiation field limiter;
  • FIG. 11 is a perspective view for explaining a second control amount of the irradiation field limiter; It is a figure for demonstrating the 1st control amount and the 2nd control amount of the irradiation field limiting device which concerns on a modification.
  • It is a block diagram which shows an example of a functional structure of a control apparatus.
  • FIG. 10 is a diagram showing an example of a display screen when image processing is not performed on an outer portion of a radiographic image;
  • FIG. 10 is a diagram showing an example of a display screen when image processing is not performed on an outer portion of a radiographic image;
  • FIG. 10 is a diagram showing an example of a display screen when image processing is not performed on an outer portion of a radiographic image;
  • FIG. 10 is a diagram showing an example of a display screen when image processing is performed on an outer portion of a radiographic image
  • FIG. 4 is a diagram for explaining an area targeted for image analysis
  • FIG. 4 is a flowchart showing an example of radiographic imaging processing
  • FIG. 5 is a plan view showing an example of the difference between the maximum detectable area and the required irradiation area
  • the radiographic imaging apparatus 1 includes a C-arm 20 having an arm section 22 and a holding section 24 .
  • a radiation irradiation unit 10 for emitting radiation R generated by the radiation source 12 is provided at one end of the arm unit 22 .
  • a radiation source 12 and an irradiation field limiter 14 are housed in the radiation irradiation unit 10 .
  • the radiation source 12 has a radiation tube (not shown) that generates radiation R, and emits the radiation R generated by the radiation tube.
  • the irradiation field limiter 14 is a so-called collimator that limits the irradiation field F of the radiation R generated by the radiation tube.
  • the irradiation field limiter 14 includes four shielding plates 14A to 14D.
  • the shielding plates 14A to 14D are plate-like members that are rectangular in plan view and made of a material that shields the radiation R such as lead or tungsten.
  • the shielding plates 14A to 14D are arranged on each side of the rectangle, and are configured so that a rectangular opening G through which the radiation R is transmitted is formed in the center.
  • the irradiation field limiter 14 changes the size of the opening G by changing the positions of the shielding plates 14A to 14D. Thereby, the irradiation field limiter 14 changes the range of the irradiation field F of the radiation R.
  • the two shielding plates 14A and 14C move in the arrow C direction. Also, the two shielding plates 14B and 14D move in the arrow D direction perpendicular to the arrow C direction.
  • the direction of arrow C is, for example, a direction along a pair of opposing sides of a detection surface 17 of a rectangular radiation detector 38, which will be described later.
  • a holding portion 24 is provided at the other end of the arm portion 22 .
  • the holding portion 24 holds the storage portion 16 .
  • the storage unit 16 stores a radiation detector 38 that detects radiation R and generates image data representing a radiation image.
  • the C-arm 20 of this embodiment is configured to be able to change the angle of the radiation detector 38 with respect to the Z-axis direction shown in FIG. 1 (vertical direction in the example of FIG. 1).
  • the radiation detector 38 detects radiation R that has passed through the subject. Specifically, as shown in FIG. 3, the radiation detector 38 detects the radiation R that has entered the storage section 16 and reached the detection surface 17 of the radiation detector 38, and based on the detected radiation R, A radiation image is generated and image data representing the generated radiation image is output. In this embodiment, the detection surface 17 is rectangular.
  • imaging a series of operations in which radiation R is emitted from the radiation source 12 and a radiographic image is generated by the radiation detector 38 may be referred to as "imaging".
  • the type of the radiation detector 38 is not particularly limited. It may be a direct conversion type radiation detector that converts to . Also, the radiation detector 38 can capture at least one of a still image and a moving image.
  • the radiation detector 38 has a maximum detectable area for the radiation R (hereinafter referred to as "maximum detection area"). Since this maximum detection area is also the maximum area in which an effective image can be generated by the radiation detector 38, it is also referred to as the maximum effective image area.
  • the maximum detection area is a sensor portion that generates and accumulates charges according to the light converted by the conversion layer that converts radiation into light, and It corresponds to the entire area in which a plurality of pixels including thin film transistors that convert charges accumulated in the sensor portion into electric signals and output the electric signals are arranged.
  • a detection surface 17 for detecting the radiation R emitted from the radiation irradiating section 10 is provided facing the radiation irradiating section 10 of the storage section 16 .
  • SID Source Image Distance
  • the C-arm 20 is held by the C-arm holder 26 so as to be movable in the direction of arrow A shown in FIG.
  • the C-arm holding portion 26 also has a shaft portion 27 that connects the C-arm 20 to the bearing 28 .
  • the C-arm 20 is rotatable around the shaft portion 27 as a rotation axis.
  • the radiographic imaging apparatus 1 also includes a main body 18 having a plurality of wheels 19 provided on the bottom.
  • a support shaft 29 extending and contracting in the Z-axis direction in FIG. 1 is provided on the upper side of the housing of the main body 18 in FIG.
  • a bearing 28 is held above the support shaft 29 so as to be movable in the arrow B direction.
  • a display 36 and an operation section 37 are provided on the upper portion of the main body section 18 .
  • the display 36 and operation unit 37 function as a user interface.
  • the display 36 presents radiographed radiographic images and information about the radiographic imaging to operators such as radiographers and doctors who perform radiographic imaging with the radiographic imaging apparatus 1 .
  • Examples of the display 36 include a liquid crystal display and the like.
  • a touch panel display in which the display 36 and the operation unit 37 are integrated is applied.
  • the operation unit 37 is operated by the operator when giving an instruction regarding radiographic image capturing.
  • Examples of the operation unit 37 include various switches, a touch panel, a touch pen, a mouse, and the like.
  • a plurality of operation units 37 may be provided, and for example, a touch panel and a foot switch operated by an operator with a foot may be provided as the operation unit 37 .
  • a control device 30 is housed that controls the irradiation field of the radiation R that irradiates the radiation detector .
  • the control device 30 includes a CPU (Central Processing Unit) 31, a memory 32 as a temporary storage area, a nonvolatile storage section 33, an I/F (InterFace) section 35, a display 36, and an operation section. 37.
  • the CPU 31 , memory 32 , storage unit 33 , I/F unit 35 , display 36 and operation unit 37 are connected to bus 39 .
  • the storage unit 33 is implemented by a HDD (Hard Disk Drive), SSD (Solid State Drive), flash memory, or the like.
  • a control program 40 is stored in the storage unit 33 as a storage medium.
  • the CPU 31 reads out the control program 40 from the storage unit 33 , expands it in the memory 32 , and executes the expanded control program 40 .
  • control amount information 42 including the control amount of the irradiation field limiter 14 . Details of the control amount information 42 will be described later.
  • the radiation source 12, the moving mechanism 14E, and the radiation detector 38 are connected to the I/F section 35.
  • the CPU 31 can exchange various information with each of the radiation source 12 , the moving mechanism 14 ⁇ /b>E, and the radiation detector 38 via the I/F section 35 .
  • the moving mechanism 14E moves the shielding plates 14A to 14D of the irradiation field limiter 14 respectively.
  • the moving mechanism 14E includes, for example, four motors corresponding to the shielding plates 14A-14D one-to-one.
  • the CPU 31 individually controls the shielding plates 14A to 14D by individually controlling the four motors.
  • the radiation source 12 has a cathode 12A and an anode 12B. Radiation R is generated by colliding an electron beam generated from the cathode 12A with the anode 12B. Corresponds to focal size.
  • the anode 12B is tilted toward the detection surface 17 with respect to the direction of the plane of the detection surface 17, and then the radiation is irradiated. It is also possible to irradiate R.
  • the focus size is larger than when the anode 12B is not tilted, so the blur area (hereinafter referred to as "blur area") generated in the outer edge portion of the radiographic image also becomes wider.
  • the amount of deviation between the irradiation field F and the detection surface 17 must satisfy the conditions defined by the standard, as shown in FIG. 7 as an example.
  • the irradiation field F is indicated by a broken-line rectangle
  • the detection surface 17 is indicated by a solid-line rectangle.
  • the deviation amounts of the corresponding four sides between the irradiation field F and the detection surface 17 are indicated by c1, c2, d1, and d2.
  • the radiation imaging apparatus 1 has a function of switching the control amount of the irradiation field limiter 14 depending on whether the required irradiation area is the maximum detection area or inside the maximum detection area.
  • the controlled variable information 42 includes a first controlled variable ⁇ and a second controlled variable ⁇ .
  • the first control amount ⁇ is an amount by which the irradiation field F is expanded outside the required irradiation area when the required irradiation area is the maximum detection area.
  • the opening G when the irradiation field limiter 14 is controlled so that the required irradiation area and the irradiation field F match the required irradiation area is represented by a dashed line rectangle.
  • the shielding plates 14A to 14D are moved outward from the position where the irradiation field limiter 14 is controlled so that the irradiation field F matches the required irradiation area.
  • a first control amount ⁇ is defined as the amount by which the As a result, the irradiation field F spreads outside the required irradiation area by an amount corresponding to the first control amount ⁇ .
  • the requested irradiation area is input by the operator through the operation unit 37 according to, for example, the body part of the subject to be imaged, the SID, and the like. Note that the requested irradiation area may be input in an external computer and transmitted from the computer to the control device 30 .
  • the first control amount ⁇ is set to a value that satisfies the above formulas (1) to (3). In this embodiment, it is set to a value that satisfies the above formulas (1) to (3) and maximizes the irradiation field F.
  • the second control amount ⁇ is the amount by which the irradiation field F is expanded outside the required irradiation area when the required irradiation area is inside the maximum detection area.
  • the shielding plates 14A to 14D are moved from the position where the irradiation field limiter 14 is controlled so that the irradiation field F matches the required irradiation area.
  • the amount of outward movement is defined as the second control amount ⁇ .
  • the irradiation field F spreads outside the required irradiation area by an amount corresponding to the second control amount ⁇ .
  • the second controlled variable ⁇ is set to a value that satisfies the above equations (1) to (3) and is greater than the first controlled variable ⁇ .
  • the second control amount ⁇ is set, for example, to a value with a margin added so that the subject portion corresponding to the required irradiation region of the radiographic image does not overlap with the above-described blurred region generated in the outer edge portion.
  • the second control amount ⁇ is set so that the area of the irradiation field F expanded according to the second control amount ⁇ is equal to or less than the area of the irradiation field F expanded by the first control amount ⁇ . may be In this case also, the above expressions (1) to (3) are satisfied.
  • the width of the blurred area generated in the outer edge of the radiographic image is not necessarily constant on each side.
  • the outer edge portion on the right side in FIG. 10 may have a wider blurred area than the outer edge portion on the left side.
  • Gray rectangles in FIG. 10 represent radiographic images.
  • the horizontal axis represents the pixel position with reference to the left end of the radiographic image in FIG. 10
  • the vertical axis represents the average value of the pixel values in the pixel position column on the horizontal axis.
  • the gentler the fluctuation of the pixel value the wider the blurred area.
  • FIG. 10 shows that the number of pixels n2 in the portion corresponding to the right side of the radiographic image where the pixel value is decreasing is greater than the number of pixels n1 in the portion corresponding to the left side of the radiographic image where the pixel value is increasing. That is, FIG. 10 shows that the right outer edge portion of the radiographic image has a wider blurred area than the left outer edge portion.
  • the anode 12B of the radiation source 12 is tilted toward the detection surface 17 with respect to the direction of the plane of the detection surface 17 and the radiation R is irradiated
  • the outer edge portion of the radiation image on the cathode 12A side is The blurred area becomes wider than the blurred area of the outer edge portion on the anode 12B side.
  • the first control amount ⁇ and the second control amount ⁇ may be set corresponding to each side of the detection surface 17 .
  • the first control amount ⁇ and the second control amount ⁇ corresponding to the side with the relatively wide blur area are the first control amount ⁇ and the second control amount ⁇ corresponding to the side with the relatively narrow blur area. It is set to a value greater than the amount ⁇ and the second control amount ⁇ .
  • the control device 30 includes a reception unit 50 , an irradiation field control unit 51 , an imaging control unit 52 , an acquisition unit 53 , an image processing unit 54 , a display control unit 55 and an analysis unit 56 .
  • the CPU 31 executes the control program 40 to function as a reception unit 50 , an irradiation field control unit 51 , an imaging control unit 52 , an acquisition unit 53 , an image processing unit 54 , a display control unit 55 and an analysis unit 56 .
  • the reception unit 50 receives imaging conditions including the requested irradiation area, the tube voltage applied to the radiation source 12, the irradiation period of the radiation R, etc. input by the operator via the operation unit 37 .
  • the irradiation field control unit 51 acquires the control amount information 42 from the storage unit 33 . Further, when the requested irradiation area received by the receiving unit 50 is the maximum detection area, the irradiation field control unit 51 controls the moving mechanism 14E to move the shield plates 14A to 14D so that the irradiation field F matches the requested irradiation area. The first control amount ⁇ included in the control amount information 42 is moved outward from the position where the control amount is set. Further, when the requested irradiation area received by the receiving unit 50 is inside the maximum detection area, the irradiation field control unit 51 controls the moving mechanism 14E to move the shielding plates 14A to 14D so that the irradiation field F is within the requested irradiation area. The second control amount ⁇ included in the control amount information 42 is moved outward from the position corresponding to the region.
  • the imaging control unit 52 performs radiographic image capturing by controlling the radiation source 12 according to the imaging conditions received by the receiving unit 50 .
  • the acquisition unit 53 acquires from the radiation detector 38 radiographic image data indicating radiographic images captured under the control of the imaging control unit 52 .
  • the image processing unit 54 When the required irradiation area is inside the maximum detection area, the image processing unit 54 removes the portion outside the required irradiation area in the radiographic image obtained according to the second control amount ⁇ , which is acquired by the acquisition unit 53. , performs image processing to fill in a preset color.
  • the radiation image indicated by the radiation image data acquired by the acquisition unit 53 is the image shown in FIG. 12 will be described.
  • the outermost black rectangle represents the display area of the radiation image when the required irradiation area on the display 36 is the maximum detection area.
  • the dashed-dotted rectangle represents the radiation image indicated by the radiation image data acquired by the acquisition unit 53 .
  • the dark gray portion represents the blurred area of the outer edge portion
  • the light gray portion represents the portion excluding the blurred area of the outer edge portion.
  • the dashed rectangle indicates the portion corresponding to the requested irradiation area.
  • the image processing unit 54 performs image processing for painting the portion outside the required irradiation area in the radiographic image with black, which is the background color. conduct. As shown in FIG. 13, by this image processing, the dark gray portion and the light gray portion in FIG. 12 outside the dashed rectangle become the same color as the background color. This makes it easier for a diagnostician, such as a doctor, to see the subject portion of interest.
  • the image processing unit 54 leaves a portion corresponding to the required irradiation area in the radiographic image obtained according to the second control amount ⁇ , and removes the other portions. You may perform the image processing which trims so that it may carry out.
  • the display control unit 55 When the requested irradiation area is the maximum detection area, the display control unit 55 performs control to display the radiation image indicated by the radiation image data acquired by the acquisition unit 53 on the display 36 . Further, the display control unit 55 performs control to display on the display 36 the radiographic image that has undergone image processing by the image processing unit 54 when the requested irradiation area is inside the maximum detection area.
  • the analysis unit 56 uses the first control amount ⁇ acquired by the acquisition unit 53 or the second It is set inside by a predetermined amount ⁇ with respect to the radiographic image obtained according to the control amount ⁇ .
  • the solid-line rectangle indicates the radiographic image
  • the dashed-line rectangle indicates the area targeted for image analysis.
  • This predetermined amount ⁇ is set to a value that does not include the blurred area of the outer edge portion, and a margin is added. In this way, by setting the area targeted for image analysis when controlling the dose of the radiation R to the inside of the radiographic image by the predetermined amount ⁇ , the area targeted for image analysis has a blurred area. less likely to be included. Therefore, the dose of radiation R can be controlled with high accuracy.
  • the predetermined amount ⁇ may be set corresponding to each side of the rectangular radiographic image.
  • the predetermined amount ⁇ corresponding to the relatively wide side of the blurred area is set to a value larger than the predetermined amount ⁇ corresponding to the relatively narrow side of the blurred area.
  • the predetermined amount ⁇ of the radiographic image obtained according to the first control amount ⁇ may be smaller than the predetermined amount ⁇ of the radiographic image obtained according to the second control amount ⁇ .
  • a radiographic image obtained according to the first control amount ⁇ means a radiographic image indicated by the radiographic image data obtained by the obtaining unit 53 when the requested irradiation area is the maximum detection area.
  • the radiographic image obtained according to the second control amount ⁇ means a radiographic image indicated by the radiographic image data obtained by the obtaining unit 53 when the requested irradiation area is inside the maximum detection area.
  • the analysis unit 56 performs image analysis for controlling the dose of the radiation R on the portion of the set region in the radiographic image.
  • An example of this image analysis is processing for generating a density histogram. For example, if the radiographic image is determined to be darker than expected based on the density histogram, the radiation source 12 is adjusted so that the dose of the radiation R is greater than that immediately before when radiographic images are captured in the next frame of moving image capturing. is controlled.
  • the radiation image capturing process shown in FIG. 15 is executed by the CPU 31 executing the control program 40 .
  • the radiation image capturing process shown in FIG. 15 is executed, for example, when an instruction to start capturing a radiation image is input to the control device 30 .
  • imaging conditions including the requested irradiation area, the tube voltage applied to the radiation source 12, the irradiation period of the radiation R, and the like are input.
  • step S10 of FIG. 15 the reception unit 50 receives imaging conditions including the requested irradiation region, the tube voltage applied to the radiation source 12, the irradiation period of the radiation R, and the like input by the operator via the operation unit 37. .
  • step S12 the irradiation field control unit 51 determines whether or not the requested irradiation area received in step S10 is the maximum detection area. If this determination is affirmative, the process proceeds to step S14.
  • step S ⁇ b>14 the irradiation field control unit 51 acquires the first control amount ⁇ included in the control amount information 42 from the storage unit 33 . Then, the irradiation field control unit 51 controls the moving mechanism 14E to move the shielding plates 14A to 14D outward by the first control amount ⁇ from the position where the irradiation field F matches the required irradiation area. After the process of step S16 is completed, the process proceeds to step S22.
  • step S10 determines whether the requested irradiation area accepted in step S10 is inside the maximum detection area. If the requested irradiation area accepted in step S10 is inside the maximum detection area, the determination in step S12 becomes a negative determination, and the process proceeds to step S18.
  • step S ⁇ b>18 the irradiation field control unit 51 acquires the second control amount ⁇ included in the control amount information 42 from the storage unit 33 . Then, the irradiation field control unit 51 controls the moving mechanism 14E to move the shielding plates 14A to 14D from the position where the irradiation field F matches the required irradiation area to the second control amount ⁇ included in the control amount information 42. move it outwards.
  • step S20 ends, the process moves to step S22.
  • step S22 the imaging control unit 52 controls the radiation source 12 in accordance with the imaging conditions accepted in step S10, thereby capturing a radiographic image.
  • step S ⁇ b>24 the acquisition unit 53 acquires radiographic image data representing the radiographic image captured by the control in step S ⁇ b>22 from the radiation detector 38 .
  • step S26 the image processing unit 54 determines whether or not the control amount of the shielding plates 14A to 14D is the first control amount ⁇ , that is, whether or not the required irradiation area is the maximum detection area. If this determination is affirmative, the process proceeds to step S28.
  • step S ⁇ b>28 the display control unit 55 performs control to display the radiation image indicated by the radiation image data acquired by the acquisition unit 53 on the display 36 .
  • step S34 the process moves to step S34.
  • step S30 the image processing unit 54 performs image processing for filling in a predetermined color the portion outside the required irradiation area in the radiographic image indicated by the radiographic image data acquired in step S24.
  • step S ⁇ b>32 the display control unit 55 controls the display 36 to display the radiation image that has undergone the image processing in step S ⁇ b>30 .
  • step S34 the analysis unit 56 moves the area targeted for image analysis when controlling the dose of the radiation R to the inside of the radiographic image indicated by the radiographic image data acquired in step S24 by a predetermined amount ⁇ . set to In step S36, the analysis unit 56 performs image analysis for controlling the dose of the radiation R on the portion of the region set in step S34 in the radiographic image. As described above, the result of the image analysis in step S36 is used for dose control of the radiation R in step S22 in the next frame in moving image shooting. When the process of step S36 ends, the radiation image capturing process ends.
  • steps S34 and S36 may be performed before the processing of steps S26 to S32, or may be performed in parallel with the processing of steps S26 to S32.
  • the blurring area of the outer edge portion of the radiographic image is requested more than when the requested irradiation area is the maximum detection area. Located outside the irradiation area. Therefore, deterioration of the image quality of the subject portion included in the requested irradiation area in the radiographic image can be suppressed.
  • a mobile radiographic imaging apparatus having a C-arm is applied as an example of a medical imaging apparatus that captures a radiographic image.
  • the medical imaging apparatus is an example of the above embodiment. is not limited to
  • the medical imaging apparatus may be configured to use a mobile cart having the radiation irradiation unit 10 and the radiation detector 38, which is a so-called electronic cassette, in combination.
  • it may be a portable medical imaging apparatus that is carried and moved by the operator.
  • the medical imaging apparatus is not limited to a mobile type, and may be a stationary medical imaging apparatus.
  • the irradiation field control unit 51 sets the difference between the maximum detection area and the required irradiation area to be less than the amount by which the irradiation field F is spread outside the required irradiation area by the first control amount ⁇ .
  • the first control amount ⁇ and the second control amount ⁇ may be the same amount.
  • the first control amount ⁇ and the second control amount ⁇ are the same amount.
  • the irradiation field F also satisfies the above formulas (1) to (3).
  • the difference between the maximum detection area and the required irradiation area here is a value representing the distance between the corresponding sides of the rectangular maximum detection area and the required irradiation area, as shown by D1 in FIG. 16 as an example.
  • the solid-line rectangle represents the maximum detection area
  • the dashed-line rectangle represents the required irradiation area.
  • the receiving unit 50, the irradiation field control unit 51, the imaging control unit 52, the acquisition unit 53, the image processing unit 54, the display control unit 55, and the analysis unit 56 perform various processes.
  • various processors shown below can be used.
  • the various processors include, in addition to the CPU, which is a general-purpose processor that executes software (programs) and functions as various processing units, circuits such as FPGAs (Field Programmable Gate Arrays), etc.
  • Programmable Logic Device which is a processor whose configuration can be changed, ASIC (Application Specific Integrated Circuit) etc. Circuits, etc. are included.
  • One processing unit may be composed of one of these various processors, or a combination of two or more processors of the same type or different types (for example, a combination of multiple FPGAs, a combination of a CPU and an FPGA). combination). Also, a plurality of processing units may be configured by one processor.
  • a single processor is configured by combining one or more CPUs and software.
  • a processor functions as multiple processing units.
  • SoC System on Chip
  • the various processing units are configured using one or more of the above various processors as a hardware structure.
  • an electric circuit combining circuit elements such as semiconductor elements can be used.
  • control program 40 has been pre-stored (installed) in the storage unit 33, but the present invention is not limited to this.
  • the control program 40 may be provided in a form recorded on a recording medium such as a CD-ROM (Compact Disc Read Only Memory), a DVD-ROM (Digital Versatile Disc Read Only Memory), and a USB (Universal Serial Bus) memory. good.
  • the control program 40 may be downloaded from an external device via a network.

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PCT/JP2022/038616 2021-10-21 2022-10-17 制御装置、制御方法、及び制御プログラム Ceased WO2023068230A1 (ja)

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JP2009273603A (ja) * 2008-05-14 2009-11-26 Konica Minolta Medical & Graphic Inc 動態画像撮影システム
JP2013094501A (ja) 2011-11-02 2013-05-20 Fujifilm Corp 放射線画像撮影システム、プログラム、及び放射線画像撮影方法
JP2019532718A (ja) * 2016-09-29 2019-11-14 コーニンクレッカ フィリップス エヌ ヴェＫｏｎｉｎｋｌｉｊｋｅ Ｐｈｉｌｉｐｓ Ｎ．Ｖ． 動的ビームサイズ制限を有する撮像システム
JP2020185145A (ja) 2019-05-14 2020-11-19 株式会社島津製作所 Ｘ線撮影装置
JP2021172384A (ja) 2020-04-27 2021-11-01 住友ベークライト株式会社 スキンパック包装体

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JP2013094501A (ja) 2011-11-02 2013-05-20 Fujifilm Corp 放射線画像撮影システム、プログラム、及び放射線画像撮影方法
JP2019532718A (ja) * 2016-09-29 2019-11-14 コーニンクレッカ フィリップス エヌ ヴェＫｏｎｉｎｋｌｉｊｋｅ Ｐｈｉｌｉｐｓ Ｎ．Ｖ． 動的ビームサイズ制限を有する撮像システム
JP2020185145A (ja) 2019-05-14 2020-11-19 株式会社島津製作所 Ｘ線撮影装置
JP2021172384A (ja) 2020-04-27 2021-11-01 住友ベークライト株式会社 スキンパック包装体

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CN118119339A (zh) 2024-05-31

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