WO2021241248A1 - Système d'imagerie par rayonnement et son procédé de commande, et programme - Google Patents

Système d'imagerie par rayonnement et son procédé de commande, et programme Download PDF

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Publication number
WO2021241248A1
WO2021241248A1 PCT/JP2021/018205 JP2021018205W WO2021241248A1 WO 2021241248 A1 WO2021241248 A1 WO 2021241248A1 JP 2021018205 W JP2021018205 W JP 2021018205W WO 2021241248 A1 WO2021241248 A1 WO 2021241248A1
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Prior art keywords
radiation
electric signal
subject
photographing means
body movement
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PCT/JP2021/018205
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English (en)
Japanese (ja)
Inventor
啓吾 横山
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キヤノン株式会社
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Publication of WO2021241248A1 publication Critical patent/WO2021241248A1/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
    • 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
    • A61B6/08—Auxiliary means for directing the radiation beam to a particular spot, e.g. using light beams

Definitions

  • the present invention relates to a radiographic imaging system that performs imaging using radiation, a control method thereof, and a program for causing a computer to execute the control method.
  • a radiography apparatus applicable to a radiography system that performs radiography using radiation
  • a pixel array in which pixels including a switch element such as a TFT (thin film) and a conversion element such as a photoelectric conversion element are arranged in a two-dimensional manner is used.
  • a radiological imaging device equipped with this device has been put into practical use.
  • This radiography apparatus can be used, for example, for medical imaging diagnosis and non-destructive inspection.
  • the radiation transmitted through the subject and incident is converted into an electric charge as an electric signal by a conversion element and accumulated for each arranged pixel.
  • the subject moves during irradiation with radiation, the subject will be blurred in the radiation image obtained by radiography.
  • the image quality of the radiation image is due to the movement of the subject during radiation irradiation. In some cases, the resolution of the image deteriorates and re-shooting is required.
  • Patent Document 1 proposes a radiographic imaging system that prohibits radiation exposure when the body movement of a subject is detected in order to prevent erroneous imaging.
  • Patent Document 1 does not assume anything from the viewpoint of taking appropriate radiography of a subject with body movement (from the viewpoint of acquiring an appropriate radiological image). For this reason, the technique described in Patent Document 1 has a problem that in radiography of a subject that is easily moved, such as a pediatric patient, it is possible to prevent the failure of radiography, but it is not possible to perform an operation related to radiography at an appropriate timing. was there.
  • the present invention has been made in view of such problems, and an object of the present invention is to provide a mechanism capable of performing an operation related to radiography at an appropriate timing even in radiography of a subject that is easily moved.
  • the radiation photographing system of the present invention is provided separately from the first photographing means including the pixel array in which the pixels for converting the radiation transmitted through the subject into an electric signal are arranged in a two-dimensional manner and the first photographing means.
  • the second photographing means for capturing a plurality of images related to the movement of the subject before the radiation imaging by the first photographing means, and the plurality of images obtained by the second photographing means are subjected to arithmetic processing. Then, based on the calculation means for calculating the information related to the body movement amount of the subject, the information related to the radiation exposure start instruction, and the information related to the body movement amount calculated by the calculation means, the first item is described. 1.
  • the photographing means has a control means for converting the radiation into the electric signal and controlling the state so that the electric signal can be stored.
  • the present invention also includes the above-mentioned control method of the radiography system and a program for causing a computer to execute the control method.
  • the operation related to radiography can be performed at an appropriate timing.
  • FIG. 1 It is a figure which shows an example of the schematic structure of the radiography system which concerns on 1st Embodiment of this invention. It is a figure which shows an example of the schematic structure of the radiological imaging section shown in FIG. 1. It is a flowchart which shows 1st example of the processing procedure in the control method of the radiography system which concerns on 1st Embodiment of this invention. It is a flowchart which shows the 2nd example of the processing procedure in the control method of the radiography system which concerns on 1st Embodiment of this invention. It is a figure for quantifying the body movement amount of the subject performed in the process of step S122 of FIGS. 3A and 3B.
  • Timing chart which shows 1st example of the processing procedure in the control method of the radiography system which concerns on 1st Embodiment of this invention. It is a timing chart which shows the 2nd example of the processing procedure in the control method of the radiography system which concerns on 1st Embodiment of this invention. It is a timing chart which shows the 3rd example of the processing procedure in the control method of the radiography system which concerns on 1st Embodiment of this invention. It is a timing chart which shows the 4th example of the processing procedure in the control method of the radiography system which concerns on 1st Embodiment of this invention.
  • FIG. 1 is a diagram showing an example of the schematic configuration of the radiographic imaging system 10 according to the first embodiment of the present invention.
  • the radiography imaging system 10 includes a radiography imaging unit (radiation imaging device) 100, a control unit 200, a radiation generator 300, a camera 400, and a control PC 500.
  • the radiation photographing unit 100 is a first photographing means including a pixel array 110 in which pixels 111 for converting the radiation 311 transmitted through the subject H into an electric signal are arranged two-dimensionally.
  • the radiological imaging unit 100 includes a pixel array 110, a drive circuit 120, and a read circuit 130.
  • the drive circuit 120 is a circuit that drives the pixel array 110 based on the control of the control unit 200.
  • the read circuit 130 is a circuit that reads out the electric signals stored in the respective pixels 111 of the pixel array 110 based on the control of the control unit 200 and outputs them as radiographic image data to the control unit 200. Further, power is supplied to each component of the radiation photographing unit 100 from a power supply circuit (not shown).
  • the control unit 200 controls each component of the radiography system 10 to comprehensively control the operation of the radiography system 10, and also performs various processes.
  • the radiography imaging unit 100 is connected to the control unit 200, and controls the transition of the radiography imaging unit 100 to the imaging preparation.
  • the control unit 200 transmits an exposure permission signal to the tube unit 310 via the console unit 320 of the radiation generator 300, and then the tube unit 200. Radiation 311 is exposed from 310.
  • the control unit 200 does not expose the radiation 311 without transmitting the exposure permission signal.
  • control unit 200 has a radiation photographing unit 100 based on the information related to the radiation exposure start instruction of the radiation 311 and the information related to the body movement amount of the subject H described later, which is transmitted from the image calculation unit 420 of the camera 400. Performs a process of determining the transition to the operation related to radiography.
  • the radiation generator 300 is a device that generates radiation 311 toward the subject H. Specifically, as shown in FIG. 1, the radiation generator 300 includes a tube unit 310, a console unit 320, and an exposure switch 330.
  • the tube unit 310 is arranged at a position where the radiation 311 can be irradiated to the subject H and the radiation photographing unit 100, and in the present embodiment, the region where the radiation 311 is irradiated is the photographing unit 410 of the camera 400. It is almost the same as the shooting area in. Further, the tube unit 310 is connected to the console unit 320 and exposes the radiation 311 based on the information input to the console unit 320. Further, a collimator capable of changing the irradiation area of the radiation 311 is attached to the tube unit 310, and the irradiation area of the radiation 311 can be appropriately changed by input information to the console unit 320 or manually. ..
  • the console unit 320 receives information related to the irradiation conditions of the radiation 311 and information related to the irradiation start instruction of the radiation 311.
  • the photographer inputs information related to the irradiation conditions (for example, the tube voltage and tube current of the tube section 310, the irradiation time of the radiation 311 and the size of the irradiation field, etc.) to the console unit 320 to emit radiation.
  • the irradiation conditions of 311 are determined.
  • the console unit 320 may determine the irradiation conditions of the radiation 311 by selecting a recipe in which each irradiation condition is registered in advance.
  • the exposure switch 330 is a switch operated when the photographer gives an instruction to start exposure to radiation 311.
  • the exposure switch 330 is a two-stage switch. Specifically, when the first-stage switch of the exposure switch 330 is pressed, the tube in the tube portion 310 rotates to be in a state where radiation 311 can be irradiated. Further, when the second stage switch of the exposure switch 330 is pressed, radiation 311 is emitted from the tube portion 310 depending on the situation.
  • the operation timing of the radiation photographing unit 100 and the timing of irradiating the radiation 311 from the tube unit 310 are synchronized, and when the photographer presses the second stage switch of the exposure switch 330, the console A signal related to the pressing of the switch in the second stage (information related to the radiation start instruction of the radiation 311) is sent to the control unit 200 via the unit 320.
  • the camera 400 includes a shooting unit 410 and an image calculation unit 420.
  • the photographing unit 410 is arranged at a position where the subject H and the radiation photographing unit 100 can be photographed.
  • the imaging unit 410 is provided separately from the radiation imaging unit 100 (first imaging means), and captures a plurality of images related to the movement of the subject H at least before the radiation imaging by the radiation imaging unit 100. Then, the photographing unit 410 transmits the image data of the plurality of images obtained by the photographing to the image calculation unit 420.
  • the light receiving unit of the photographing unit 410 has a plurality of pixels capable of converting light into electric charges, which are electric signals, arranged in a two-dimensional manner, and the number of arranged pixels is the radiation.
  • the number is sufficient for a plurality of pixels 111 in the pixel array 110 of the photographing unit 100.
  • the number of arranged pixels in the pixel array 110 of the radiation photographing unit 100 is 2500 pixels ⁇ 2500 pixels
  • the number of arranged pixels in the photographing unit 410 of the camera 400 is 500 pixels ⁇ 500 pixels or more, preferably 2500 pixels ⁇ 2500 pixels. It is desirable that the above is the case.
  • the photographing unit 410 may have sensitivity to visible light or may have sensitivity to an infrared region.
  • the image calculation unit 420 calculates information related to the amount of body movement of the subject H by performing calculation processing on a plurality of image data obtained by the photographing unit 410 by a predetermined algorithm.
  • the image calculation process by the image calculation unit 420 is executed on hardware such as FPGA (Field-Programmable Gate Array) for speeding up.
  • the calculation result of the information related to the body movement amount of the subject H by the image calculation unit 420 is transmitted to the control unit 200.
  • the control PC 500 includes a control PC main body 510 and a display 520.
  • the control PC main body 510 uses the control unit 200 to input information to the console unit 320 of the radiation generator 300, information related to the preparation status of the console unit 320 of the radiation generator 300, and an image calculation unit 420 of the camera 400. Information on the calculation result of the above and the shooting information of the shooting unit 410 of the camera 400 are displayed on the display 520 as needed.
  • the control PC main body 510 displays information on the subject H and other information necessary for photographing and diagnosis on the display 520.
  • the imaging unit 410 and the image calculation unit 420 of the camera 400 may have the same skeleton as long as the radiological imaging system 10 as a whole satisfies the functions in the present description, and may have the same physical form. Part or all of it may be in the form of a program without having.
  • some functions of the control unit 200 may be mounted in a separate housing outside the radiography unit 100.
  • FIG. 2 is a diagram showing an example of a schematic configuration of the radiological imaging unit 100 shown in FIG.
  • the same components as those shown in FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.
  • the radiological imaging unit 100 includes a pixel array 110, a drive circuit 120, and a read circuit 130.
  • the pixel array 110 includes a plurality of pixels 111 arranged in a two-dimensional shape (specifically, a matrix shape).
  • the pixel 111 outputs an electric signal corresponding to the incident radiation 311.
  • One pixel 111 is obtained by a conversion element 1111 for converting the incident radiation 311 into an electric charge, and a conversion element 1111. It includes a switch element 1112 that outputs an electric charge (electrical signal) to the signal line 103.
  • the conversion element 1111 may be configured to include, for example, a scintillator that converts radiation 311 into light and a photoelectric conversion element that converts the light into electric charges, but is limited thereto in the present embodiment. is not it.
  • the conversion element 1111 may be a direct type conversion element that directly converts the radiation 311 into an electric charge which is an electric signal.
  • the switch element 1112 may include, for example, a thin film transistor (TFT) of amorphous silicon or polycrystalline silicon, but it is preferable to use a TFT of polycrystalline silicon.
  • TFT thin film transistor
  • silicon is used as the semiconductor material of the switch element 1112, but the present embodiment is not limited to this, and other semiconductor materials such as silicon germanium may be used.
  • the first main electrode of the switch element 1112 is electrically connected to the first electrode of the conversion element 1111
  • the bias wire 101 is electrically connected to the second electrode of the conversion element 1111.
  • the bias line 101 is commonly connected to the second electrode of the plurality of conversion elements 1111 arranged along the row.
  • the bias lines 101 arranged in each column are commonly connected to the bias lines 101 arranged along the rows. At this time, the bias line 101 receives a bias voltage from a power supply circuit (not shown).
  • the signal line 103 is electrically connected to the second main electrode of the switch element 1112.
  • the signal line 103 is commonly connected to the second main electrode of the switch element 1112 of the pixel 111 arranged along the row.
  • the signal line 103 is arranged for each row of pixels 111.
  • Each signal line 103 is electrically connected to the read circuit 130.
  • the drive line 102 is electrically connected to the control electrode of the switch element 1112.
  • the drive line 102 is commonly connected to the control electrodes of the switch elements 1112 of the plurality of pixels 111 arranged along the line, and the gate control voltages Vg1 to Vgn are applied from the drive circuit 120.
  • the read circuit 130 includes an operational amplifier 131, a sample hold circuit 132, a multiplexer 133, and an AD converter 134. Inside the read circuit 130, the signal line 103 is connected to the inverting input terminal of each operational amplifier 131. Further, the inverting input terminal of the operational amplifier 131 is connected to the output terminal via the feedback capacitance, and the non-inverting input terminal of the operational amplifier 131 is connected to an arbitrary fixed potential. The operational amplifier 131 functions as a charge-voltage conversion circuit. Further, an AD converter 134 is connected to the subsequent stage of the operational amplifier 131 via a sample hold circuit 132 and a multiplexer 133. As a result, the read circuit 130 is a digital conversion circuit that converts the electric signal (charge) output to the signal line 103 into a digital signal. In the present embodiment, the read circuit 130 may integrate all the circuits or may disperse and arrange each circuit individually.
  • FIG. 3A is a flowchart showing a first example of a processing procedure in the control method of the radiography imaging system 10 according to the first embodiment of the present invention.
  • step S111 the photographer inputs to the console unit 320 of the radiation generator 300 information related to irradiation conditions such as the irradiation time of the radiation 311 and the tube current and tube voltage of the tube unit 310.
  • the photographer may input the set value to the console unit 320, or may select a recipe in which each irradiation condition is determined in advance.
  • the system may be a system in which the photographer inputs information related to the irradiation condition to the control PC main body 510 and transmits the information related to the irradiation condition to the console unit 320 via the control unit 200.
  • step S112 when the photographer inputs information related to the imaging preparation to the console unit 320 of the radiation generator 300, the radiation imaging unit 100 transitions to the imaging preparation state. Specifically, when the photographer inputs information related to shooting preparation to the control PC main body 510, the information is transmitted to the console unit 320 via the control unit 200, and the radiography photographing unit 100 prepares for shooting. Transition to the state.
  • the photographer inputs information related to shooting preparation to the console unit 320, for example, when the photographer presses the first-stage switch of the exposure switch 330.
  • the exposure switch 330 is of a two-stage type, and for example, the tube unit 310 starts warm-up operation when the first-stage switch is pressed.
  • control unit 200 turns on the power to the radiation photographing unit 100, and the bias voltage is applied to the conversion element 1111 of each pixel 111 to the pixel array 110 via the bias line 101. Then, when a bias voltage is applied to the conversion element 1111 of each pixel 111, the conversion element 1111 is in a state where the radiation 311 can be converted into an electric charge which is an electric signal. However, in the state where the bias voltage is applied, a certain amount of electric charge (dark current) is generated from the conversion element 1111 regardless of the incident of the radiation 311.
  • step S131 the control unit 200 controls the drive circuit 120 of the radiography photographing unit 100, and sequentially applies the gate control voltages Vg1 to Vgn in which the switch element 1112 connected to the drive line 102 is in a conductive state.
  • the dark current accumulated in the conversion element 1111 is periodically removed (in step S131 of FIG. 3A, this state is referred to as a “blank reading state”).
  • step S121 the photographing unit 410 of the camera 400 continuously starts photographing the area including the subject H and the radiation photographing unit 100, which are the irradiation areas of the radiation generator 300.
  • the optical zoom of the photographing unit 410 of the camera 400 is preset so that the radiation photographing unit 100 is just included in the photographing area of the photographing unit 410 of the camera 400. Therefore, in the present embodiment, it is possible to grasp the resentment represented by one of the photographing pixels in the photographing unit 410 of the camera 400 from the approximate dimensions of the radiation photographing unit 100.
  • the external dimensions of the radiographic imaging unit 100 are 400 mm ⁇ 400 mm and the number of pixels of the imaging unit 410 of the camera 400 is 4000 pixels ⁇ 2000 pixels
  • the external dimensions of the radiographic imaging unit 100 are the imaging unit 410 of the camera 400.
  • one pixel of the photographing unit 410 corresponds to an area of approximately 0.1 mm ⁇ 0.2 mm on the surface of the radiation photographing unit 100.
  • the zoom of the imaging unit 410 of the camera 400 is preferably determined in advance when the position of the radiation imaging unit 100 is fixed in advance, but the radiography unit 100 may be in the form of a portable cassette or the like. If it is supposed to be carried, it is desirable to adjust the optical zoom in the absence of the subject H.
  • the subject H is interested while looking at the image taken by the photographing unit 410 while the subject H is moved to the position where the radiation photographing unit 100 performs radiation photographing.
  • the optical zoom may be adjusted so that the area fits within the shooting area.
  • step S122 the image calculation unit 420 of the camera 400 calculates and processes a plurality of images continuously obtained by the photographing unit 410 of the camera 400 to calculate information related to the body movement amount of the subject H.
  • the body movement amount of the subject H is quantified at any time, and the quantified value of the body movement amount of the subject H is obtained as the information related to the body movement amount of the subject H.
  • the method of quantifying the body movement amount of the subject H will be described in detail in the column of " ⁇ d> Method of quantifying the body movement amount of the subject" below.
  • step S113 when the photographer presses the second-stage switch of the exposure switch 330, a signal (exposure start of radiation 311) relating to the pressing of the second-stage switch is sent to the control unit 200 via the console unit 320. Information related to the instruction) will be sent.
  • step S123 in the image calculation unit 420 of the camera 400, the information related to the body movement amount of the subject H calculated in step S122 is within a predetermined condition (specifically, it falls below a predetermined threshold value in a certain period of time).
  • T Judge whether or not.
  • the process returns to step S121, and the processes after step S121 are performed again.
  • step S123 when the information related to the body movement amount of the subject H calculated in step S122 is within the predetermined condition (specifically, it falls below the predetermined threshold value in a certain period) (S123). / YES), the process proceeds to step S132.
  • the control unit 200 inputs the information related to the radiation exposure start instruction in step S113, and the information related to the body movement amount of the subject H falls below a predetermined threshold value in a certain period by step S123. Therefore (S123 / YES), the radiation photographing unit 100 converts the radiation 311 into an electric signal related to the radiographic image and controls the state so that the electric signal can be stored (accumulated state).
  • the control method of the radiography unit 100 by the control unit 200 will be described in detail in the column of " ⁇ e> Explanation of timing chart in the control method of the radiography system" below.
  • step S133 the control unit 200 permits the exposure of the radiation 311 to the console unit 320 of the radiation generator 300. Send a radiation permission signal.
  • step S114 the console unit 320 of the radiation generator 300 receives information related to the radiation 311 exposure start instruction based on the pressing of the second stage switch of the radiation switch 330 in step S113, and the control in step S133. Control is performed to irradiate the radiation 311 from the tube portion 310 of the radiation generator 300 at the timing when both the exposure permission signal from the unit 200 and the radiation permission signal are input.
  • step S134 the control unit 200 controls the radiation photographing unit 100, converts the radiation 311 irradiated during the accumulated state into an electric charge, which is an electric signal. This is acquired as a radiographic image.
  • step S134 the flowchart shown in FIG. 3A ends.
  • FIG. 3B is a flowchart showing a second example of the processing procedure in the control method of the radiography system 10 according to the first embodiment of the present invention.
  • the same processing steps as those shown in FIG. 3A are assigned the same step numbers, and detailed description thereof will be omitted.
  • step S132 the control unit 200 shifts the radiography unit 100 to a storage state capable of radiography, but shifts to the storage state.
  • the image calculation unit 420 of the camera 400 has information related to the body movement amount of the subject H within a predetermined condition (specifically,). , It is judged whether or not it has fallen below a predetermined threshold in a certain period of time.
  • step S121 when the information relating to the body movement amount of the subject H is not within the predetermined condition (specifically, it does not fall below the predetermined threshold value in a certain period) (S124 / NO), step S121.
  • the process returns to, and the processes after step S121 are performed again.
  • the control unit 200 controls to stop the transition based on, for example, information related to the body movement amount of the subject H.
  • the control unit 200 may return the radiography photographing unit 100 to the blank reading state of step S131 again. Further, in this case, the exposure permission signal is not transmitted to the console unit 320 in step S133.
  • step S133 when the information related to the body movement amount of the subject H is within the predetermined condition (specifically, it falls below the predetermined threshold value in a certain period) (S124 / YES), step S133. Proceed to.
  • the control unit 200 continuously advances the transition and the transition is performed. After the transition is completed, the process proceeds to step S133. Then, when the process proceeds to step S133, the control unit 200 transmits an exposure permission signal to the console unit 320. After that, the same processing step as in FIG. 3A is performed, and the flowchart shown in FIG. 3B ends.
  • ⁇ D> Method for Quantifying the Body Movement of the Subject a method for quantifying the body movement of the subject H performed in the process of step S122 in FIGS. 3A and 3B will be described.
  • the image calculation unit 420 of the camera 400 outputs the plurality of images. It is used to quantify the amount of body movement of the subject H.
  • FIG. 4 is a diagram for explaining a method of quantifying the amount of body movement of the subject H performed in the process of step S122 of FIGS. 3A and 3B.
  • FIG. 4 shows an example in which four images of frames 1 to 4 taken sequentially are applied as an example of a plurality of continuously shot images.
  • the image calculation unit 420 of the camera 400 takes frames 1 to 4, which are a plurality of images continuously taken from the photographing unit 410 of the camera 400. Convert to grayscale sequentially. At this time, it is desirable that the frame rate of the photographing unit 410 of the camera 400 is as high as possible, and if deterioration in image quality due to insufficient exposure is not a problem, the frame rate is taken as fast as possible. Further, it is desirable that the photographing unit 410 of the camera 400 for photographing is attached in the vicinity of the tube unit 310 of the radiation generator 300.
  • the frames 1 to 4 converted to the gray scale are exemplified by the frames 1 (411) to the frame 4 (414) which are the gray scale images shown in the group (a) of FIG.
  • the image calculation unit 420 of the camera 400 uses a Laplacian filter with respect to the frames 1 (411) to 4 (414), which are grayscale images shown in the group (a) of FIG. 4, and the edge of the subject H. Perform detection.
  • the frames 1 to 4 processed for edge detection are exemplified by the frame 1 (421) to the frame 4 (424) which are the edge detection images shown in the group (b) of FIG.
  • the edge detection is performed by subtracting the output of vertically, horizontally, and diagonally adjacent pixels (8 pixels in total).
  • the image calculation unit 420 of the camera 400 performs an calculation process one frame before the frame 1 (421) to the frame 4 (424), which are the edge detection images shown in the group (b) of FIG. Subtract the image and take the absolute value.
  • the body movement detection images 431 to 433 shown in the group (c) of FIG. 4 can be obtained.
  • the body motion detection image 431 is an image obtained as a result of subtracting the frame 1 (421) from the frame 2 (422).
  • the body motion detection image 432 is an image obtained as a result of subtracting the frame 2 (422) from the frame 3 (423), and the body motion detection image 433 is a frame 3 (423) from the frame 4 (424).
  • the body movement detection image 431 As shown in the body movement detection image 431, it can be seen that the body movement of the subject H was performed between the shooting of the frame 2 (422) and the frame 1 (421). Further, as shown in the body motion detection image 432 and the body motion detection image 433, between the shooting of the frame 3 (423) and the frame 2 (422), and between the shooting of the frame 4 (424) and the frame 3 (423). Then, it can be seen that the body movement of the subject H is gradually suppressed. Therefore, in the latter body motion detection images 432 and 433, the output is lower than that of the body motion detection image 431.
  • the image calculation unit 420 of the camera 400 calculates the average output in the predetermined area 4321 for the body motion detection image shown in the group (c) of FIG.
  • the predetermined area 4321 may be designated via the control PC 500 before shooting, may be determined at the time when the shooting unit 410 of the camera 400 is installed, or the shot image of the subject H may be used.
  • the control PC 500 may be automatically determined.
  • the calculated average output of the predetermined area 4321 is affected by the brightness of the room in which the image was taken, the exposure time of the image pickup unit 410 of the camera 400, the gain setting, and the like.
  • the average output obtained from the motion detection image is standardized by the output of the original captured image.
  • the image calculation unit 420 of the camera 400 quantifies the amount of body movement of the subject H for each shooting frame. It is desirable that the image calculation process by the image calculation unit 420 be performed at a speed equal to or higher than the shooting speed of the shooting unit 410, and in order to achieve this, the calculation process may be performed in hardware such as FPGA. desirable.
  • the method for quantifying the body movement amount of the subject H described here is an example until it gets tired, and within the scope of the present invention, a method for quantifying the body movement amount of the subject H based on a plurality of images from the photographing unit 410. If so, it is applicable.
  • the image calculation unit 420 of the camera 400 may perform a filter processing on the calculated image and a correction process using other information in the middle of the calculation process.
  • the body movement shown in the group (c) of FIG. 4 from the grayscale image shown in the group (a) of FIG. 4 without creating the edge detection image in the middle shown in the group (b) of FIG. The detection image may be created directly.
  • FIG. 5A is a timing chart showing a first example of a processing procedure in the control method of the radiography system 10 according to the first embodiment of the present invention.
  • the timing chart of FIG. 5A corresponds to the flowchart of FIG. 3A.
  • the period T1 indicates a period in which the radiological imaging unit 100 is in a blank reading state as shown in FIG. 3A.
  • the gate control voltages Vg1 to Vgn shown in FIG. 2 are periodically HI (voltage at which the switch element 1112 is turned on). ) Is applied, and the switch element 1112 is scanned.
  • the image calculation unit 420 of the camera 400 continuously quantifies the body movement amount of the subject H, and in FIG. 5A, this value is shown as a “quantification value of the body movement amount”.
  • the second-stage switch of the exposure switch 330 is pressed, and the quantified value of the body movement amount is below the predetermined threshold value th determined in advance in S for a certain period of time. .. Specifically, in FIG. 5A, the photographer has already pressed the second-stage switch of the exposure switch 330, and thereafter, the quantified value of the body movement amount falls below the predetermined threshold value th in S for a certain period of time. There is. Therefore, the control unit 200 does not newly apply HI to the gate control voltages Vg1 to Vgn during the period T2 after the time point (p_a).
  • the predetermined threshold value th can be changed at any time.
  • the predetermined threshold value th may be a predetermined value, a value determined according to the shooting technique or the age of the subject H, and the predetermined threshold value th may be set according to the irradiation time of shooting. It may be a determined value, or it may be a value determined immediately before the imaging by displaying the quantified value of the body movement amount on the control PC 500 in real time and observing this value.
  • the fixed period S is 100 ms, and is determined based on 10 ms, which is the irradiation time of the radiation 311 set by the console unit 320 of the radiation generator 300.
  • 10 ms which is the irradiation time of the radiation 311 set by the console unit 320 of the radiation generator 300.
  • the fixed period S is 200 ms. That is, in this example, the fixed period S is set to be 10 times longer than the set irradiation time of the radiation 311.
  • the radiological imaging unit 100 transitions from the “blank reading state” to the “accumulation state”.
  • the period T2 indicates the period after the time point (p_a), after the scanning of the gate control voltages Vg1 to Vgn is completely stopped. That is, the control unit 200 controls to stop reading the electric signal stored in the pixel array 110 when the radiography unit 100 controls to transition to the storage state shown in the period T2. Further, during this period T2, the control unit 200 transmits an exposure permission signal to the console unit 320 of the radiation generator 300. After that, the radiation 311 is irradiated from the tube portion 310 of the radiation generator 300. The irradiated radiation 311 passes through the subject H and is incident on the radiation photographing unit 100.
  • the radiation 311 incident on the radiation photographing unit 100 is converted into an electric charge which is an electric signal by the conversion element 1111 of the radiation photographing unit 100, and is accumulated in the pixel 111.
  • This period T2 is set to be at least longer than the irradiation time of the radiation 311. In this example, a fixed time of 100 ms is provided with respect to the irradiation time of the radiation 311 of 10 ms. After the end of the period T2, the transition to the period T3 occurs.
  • the scanning is restarted from the point where the scanning of the gate control voltages Vg1 to Vgn (application of HI) is completed at the end of the period T1.
  • the electric charge which is an electric signal stored in the pixel 111
  • the radiation photographing unit 100 generates a radiation image which is a photographed image based on these digital signals.
  • the radiation switch 330 of the radiation generator 300 may or may not be pressed.
  • the period T3 ends when the scanning (application of HI) of the gate control voltage Vg1 to Vgn has been completed.
  • the period T4 is a corrected image acquisition period for correcting the radiographic image which is the captured image obtained in the period T3.
  • the scanning of the gate control voltage Vg1 to Vgn is stopped for the same period as the period T2, and then the gate control voltage Vg1 to Vgn is scanned again in the same manner as the period T3 to irradiate the radiation 311.
  • FIG. 5B will be described.
  • FIG. 5B is a timing chart showing a second example of the processing procedure in the control method of the radiography system 10 according to the first embodiment of the present invention.
  • the same item names as the items shown in the timing chart of FIG. 5A are given the same item names, and detailed description thereof will be omitted.
  • FIG. 5B after the quantified value of the body movement amount falls below the predetermined threshold value th in S for a certain period of time, the second stage switch of the exposure switch 330 is pressed by the shadow person. Then, in FIG. 5B, at the time point (p_b), the quantified value of the body movement amount is below the predetermined threshold value th for a certain period S, and the second stage switch of the exposure switch 330 is pressed. Is. Further, also in FIG. 5B, similarly to the timing chart of FIG. 5A, the control unit 200 does not newly apply HI to the gate control voltages Vg1 to Vgn during the period T2 after the time point (p_b).
  • the radiological imaging unit 100 can be transitioned to a storage state in which the radiation photographing unit 100 can be photographed at the timing when the body movement of the subject H is settled, while avoiding the imaging when the body movement of the subject H is stopped. It is possible to suppress deterioration of the image quality of the radiographic image which is a captured image.
  • FIGS. 5C and 5D will be described.
  • FIG. 5C is a timing chart showing a third example of the processing procedure in the control method of the radiography system 10 according to the first embodiment of the present invention.
  • FIG. 5D is a timing chart showing a fourth example of the processing procedure in the control method of the radiography system 10 according to the first embodiment of the present invention.
  • the same item names as the items shown in the timing chart of FIG. 5A are given the same item names, and detailed description thereof will be omitted.
  • control unit 200 controls the conditions necessary for imaging in the radiography unit 100 as a part of transitioning the radiography unit 100 to the accumulated state based on the quantified value of the body movement amount. ..
  • control unit 200 controls the electric power in the read circuit 130 required for shooting to obtain an image output based on the quantified value of the body movement amount, and it is determined that the body movement of the subject H has subsided. Power is applied to the read circuit 130.
  • the HI in the power of the read circuit represents a state in which the power capable of converting the electric signal input via the signal line 103 into a digital signal is applied in the read circuit 130, and the LO Indicates a standby state in which power consumption is suppressed.
  • the quantified value of the body movement amount is below the predetermined threshold value th, so that the power of the read circuit 130 is in the HI state.
  • the transition of the radiography unit 100 to the blank reading state is also controlled based on the quantified value of the body movement amount.
  • the control unit 200 reads blank from the state where the radiography unit 100 is not operating. It is transitioning to the state. After that, as in the timing chart of FIG.
  • the control unit 200 stops the blank reading state of the radiography photographing unit 100 and shifts to the accumulation state.
  • the radiation photographing unit 100 can suppress power consumption before photographing by not performing unnecessary power input or operation. That is, even in the case of shooting the subject H whose body movement does not stop for a long period of time, it is possible to shoot without worrying about power consumption. This is particularly effective when the power of the radiography photographing unit 100 is supplied from the battery.
  • FIGS. 5E and 5F will be described.
  • FIG. 5E is a timing chart showing a fifth example of the processing procedure in the control method of the radiography system 10 according to the first embodiment of the present invention.
  • FIG. 5F is a timing chart showing a sixth example of the processing procedure in the control method of the radiography system 10 according to the first embodiment of the present invention.
  • the same item names as the items shown in the timing charts of FIGS. 5A to 5D are given the same item names, and detailed description thereof will be omitted.
  • the radiation imaging unit 100 accumulates after the second-stage switch of the exposure switch 330 is pressed and the quantified value of the body movement amount falls below the predetermined threshold value th in S for a certain period of time.
  • the process up to the transition to the state is different from that in FIGS. 5A to 5D.
  • the second stage switch of the exposure switch 330 is pressed, and the quantified value of the body movement amount is below the predetermined threshold value th in a certain period S. ..
  • the gate control voltages Vg1 to Vgn are once scanned up to Vgn, and then the radiography unit 100 is transitioned to the accumulated state. That is, when the control unit 200 controls the radiography photographing unit 100 so as to transition to the storage state, the pixel array 110 reads out the electric signal stored in at least a part of the pixels 111 of the pixel array 110, and then reads the electric signal. Control is performed to stop reading of the electric signal stored in the. Further, the control unit 200 is simultaneously controlling the power of the read circuit 130 to be HI at the time point (p_e).
  • the control unit 200 transmits the exposure permission signal to the console unit 320 of the radiation generator 300, as in FIG. 5A.
  • 10 ms to 100 ms are assumed as the time from the time point (p_e) until the radiological imaging unit 100 transitions to the accumulation state and becomes capable of radiographic imaging, and is read during this period.
  • the power supplied to the circuit 130 is stable.
  • the operation after the radiological imaging unit 100 transitions to the accumulation state is the same as that in FIG. 5A.
  • the timing chart of FIG. 5F is an example of the operation shown in FIG. 5E and corresponds to the processing of the flowchart of FIG. 3B.
  • the control unit 200 stops the transition to the accumulation state of the radiography imaging unit 100. Take control.
  • the second stage switch of the exposure switch 330 is temporarily pressed, and the quantified value of the body movement amount is a predetermined threshold value in S for a certain period.
  • the subject H has moved again while the radiography unit 100 is transitioning to the accumulation state, so that the transition to the storage state of the radiography unit 100 is stopped and the blank reading state is maintained. ..
  • the power consumption before shooting can be suppressed by not performing unnecessary power input or operation at the stage when the shooting is not ready.
  • the control unit 200 has information (S113) related to an exposure start instruction of the radiation 311 and information related to the body movement amount calculated by the image calculation unit 420. Based on (S122), the radiation photographing unit 100 converts the radiation 311 into an electric signal and controls the transition to a state in which the electric signal can be stored (accumulation state).
  • the operation related to the radiography can be performed at an appropriate timing (the timing when the body movement of the subject H is settled).
  • the schematic configuration of the radiography system according to the second embodiment is the same as the schematic configuration of the radiography system 10 according to the first embodiment shown in FIG. Further, the schematic configuration of the radiological imaging unit 100 according to the second embodiment is the same as the schematic configuration of the radiological imaging unit 100 according to the first embodiment shown in FIG.
  • FIG. 6 is a flowchart showing an example of a processing procedure in the control method of the radiography system 10 according to the second embodiment of the present invention.
  • the same processing steps as those shown in FIG. 3A are assigned the same step numbers, and detailed description thereof will be omitted.
  • step S125 is added. Specifically, in FIG. 6, when it is determined in step S123 that the information related to the body movement amount of the subject H is within the predetermined condition (S123 / YES), in the subsequent step S125, the image calculation unit 420 is the console unit 320. Sends an exposure permission signal to.
  • step S114 the console unit 320 is provided with information related to the radiation start instruction of the radiation 311 based on the photographer pressing the second stage switch of the radiation switch 330, and from the control unit 200.
  • the input of the radiation permission signal from the image calculation unit 420 is aligned in addition to the input of the radiation permission signal, the radiation 311 is radiated from the tube portion 310 of the radiation generator 300.
  • FIG. 7 is a timing chart showing an example of a processing procedure in the control method of the radiography system 10 according to the second embodiment of the present invention.
  • the same item names as the items shown in the timing charts of FIGS. 5A to 5F are given the same item names, and detailed description thereof will be omitted.
  • the second-stage switch of the exposure switch 330 is pressed, and the quantified value of the body movement amount is below the predetermined threshold value th in S for a certain period of time.
  • the image calculation unit 420 transmits an exposure permission signal to the console unit 320. After that, when the radiography unit 100 shown in the period T2 transitions to the accumulation state, the control unit 200 transmits an exposure permission signal to the console unit 320.
  • the radiography is performed at an appropriate timing (the timing when the body movement of the subject H is settled). Such an operation can be performed.
  • the third embodiment is a form showing an application example of the radiography system.
  • FIG. 8 is a diagram showing an example of a schematic configuration of a radiography system according to a third embodiment of the present invention. Specifically, FIG. 8 is an example in which the radiographic imaging system 10 according to the first and second embodiments described above is applied to an X-ray imaging system. In FIG. 8, the same components as those shown in FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.
  • the X-ray tube 6050 in FIG. 8 has a configuration corresponding to, for example, the radiation generator 300 in FIG.
  • the image processor 6070 of FIG. 8 has a configuration corresponding to, for example, the control unit 200 of FIG. 1 and the control PC main body 510.
  • the display 6080 in FIG. 8 has a configuration corresponding to, for example, the display 520 in FIG.
  • the chest 6061 of the patient 6060 in FIG. 8 has a configuration corresponding to, for example, the subject H in FIG. In the example shown in FIG. 8, the configuration corresponding to the camera 400 in FIG. 1 is not shown.
  • the X-ray 6051 generated by the X-ray tube 6050 which is a radiation generator, passes through the chest 6061 of the patient 6060, which is the subject, and is incident on the radiography unit 100 including the pixel array. do.
  • the X-ray 6051 incident on the radiography unit 100 contains information on the inside of the body of the patient 6060.
  • the radiation photographing unit 100 acquires an electric signal related to the radiation image corresponding to the X-rays 6051 incident on the pixel array.
  • the electrical signal related to the radiographic image is image-processed by the image processor 6070, which is a signal processing means, and can be displayed and observed as a radiographic image on the display 6080, which is a display means of the control room.
  • the electric signal related to the radiographic image processed by the image processor 6070 can be transferred to a remote place by a transmission processing means 6090 such as a telephone line.
  • a transmission processing means 6090 such as a telephone line.
  • it can be displayed on a display 6081, which is a display means installed in a doctor's room or the like in another place, or stored in a recording means such as an optical disk, and a doctor at a remote place can diagnose the patient 6060.
  • the film processor 6100 which is a recording means, can record on the film 6110, which is a recording medium.
  • the present invention supplies a program that realizes one or more functions of the above-described embodiment to a system or device via a network or storage medium, and one or more processors in the computer of the system or device reads and executes the program. It can also be realized by the processing to be performed. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.
  • a circuit for example, ASIC
  • This program and a computer-readable storage medium that stores the program are included in the present invention.

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Abstract

La présente invention concerne : une partie d'imagerie par rayonnement (100) qui comprend un réseau de pixels (110) dans laquelle les pixels (111) qui convertissent le rayonnement (311) transmis à travers un objet (H) en un signal électrique sont disposés de manière bidimensionnelle ; une partie d'imagerie (410) qui est disposée séparément de la partie d'imagerie par rayonnement (100), et qui capture une pluralité d'images concernant le mouvement de l'objet (H) au moins avant que l'imagerie par rayonnement soit effectuée par la partie d'imagerie par rayonnement (100) ; une unité de calcul d'image (420) qui effectue un processus de calcul sur la pluralité des images obtenues par la partie d'imagerie (410) pour calculer les informations concernant la quantité du mouvement physique de l'objet (H) ; et une unité de commande (200) qui effectue la commande de sorte que la partie d'imagerie par rayonnement (100) effectue une transition vers l'état (état d'accumulation) dans lequel la partie d'imagerie par rayonnement (100) est laissée à convertir le rayonnement (311) en un signal électrique et cumule le signal électrique, en fonction des informations concernant une instruction de démarrer l'exposition avec le rayonnement (311) et des informations concernant la quantité du mouvement physique calculée par l'unité de calcul d'image (420).
PCT/JP2021/018205 2020-05-28 2021-05-13 Système d'imagerie par rayonnement et son procédé de commande, et programme WO2021241248A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009028367A (ja) * 2007-07-27 2009-02-12 Fujifilm Corp 放射線画像撮影システム
JP2010264250A (ja) * 2010-06-09 2010-11-25 Canon Inc Ｘ線撮影装置
US20140378816A1 (en) * 2013-06-21 2014-12-25 Samsung Electronics Co., Ltd. Information providing method and medical diagnosis apparatus for providing information
JP2015057246A (ja) * 2014-12-25 2015-03-26 キヤノン株式会社 放射線撮像装置、放射線撮像方法、記録媒体及びプログラム

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009028367A (ja) * 2007-07-27 2009-02-12 Fujifilm Corp 放射線画像撮影システム
JP2010264250A (ja) * 2010-06-09 2010-11-25 Canon Inc Ｘ線撮影装置
US20140378816A1 (en) * 2013-06-21 2014-12-25 Samsung Electronics Co., Ltd. Information providing method and medical diagnosis apparatus for providing information
JP2015057246A (ja) * 2014-12-25 2015-03-26 キヤノン株式会社 放射線撮像装置、放射線撮像方法、記録媒体及びプログラム

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