WO2022196705A1 - 情報処理装置、情報処理方法、プログラム、及び放射線撮影システム - Google Patents
情報処理装置、情報処理方法、プログラム、及び放射線撮影システム Download PDFInfo
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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
- A61B6/54—Control of apparatus or devices for radiation diagnosis
- A61B6/542—Control of apparatus or devices for radiation diagnosis involving control of exposure
- A61B6/544—Control of apparatus or devices for radiation diagnosis involving control of exposure dependent on patient size
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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
- A61B6/48—Diagnostic techniques
- A61B6/488—Diagnostic techniques involving pre-scan acquisition
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- 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
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- A61B6/58—Testing, adjusting or calibrating thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging
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- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/86—Combinations of lidar systems with systems other than lidar, radar or sonar, e.g. with direction finders
Definitions
- the technology of the present disclosure relates to an information processing device, an information processing method, a program, and a radiation imaging system.
- Radiographic conditions include the tube voltage and tube current-time product of the radiation source. Setting radiography conditions so that radiography is performed with an appropriate radiation dose according to the body thickness of the subject is important in obtaining clinically sufficient image quality and in suppressing excessive exposure to the subject. desirable.
- JP-A-2017-136300 and JP-A-2018-196791 disclose a method of measuring the body thickness of a subject.
- Japanese Patent Application Laid-Open No. 2017-136300 discloses calculating the body thickness of a subject based on distance image information obtained by optically photographing the subject. More specifically, in Japanese Patent Application Laid-Open No. 2017-136300, based on the distance image information obtained by the optical sensor, the first distance from the optical sensor to the irradiation side of the subject, and the distance from the optical sensor to the shooting stand. It is described that the body thickness of the subject is calculated based on the second distance of .
- Japanese Patent Application Laid-Open No. 2018-196791 discloses that a distance sensor measures SID (Source Image receptor Distance), which is the distance between the radiation irradiation device (that is, the radiation source) and the surface of the radiation detector, and the distance between the radiation irradiation device and the surface of the subject. and the SOD (Source Object Distance), which is the distance of , and subtracting the SOD from the SID to obtain the body thickness of the subject.
- SID Source Image receptor Distance
- SOD Source Object Distance
- the subject since the subject is positioned on the detection plane during radiography, it is not easy to obtain the first distance from the distance information obtained by the sensor because the subject is an obstacle. Although it is conceivable to measure the first distance in advance, the first distance may differ each time radiography is performed. In particular, in a radiation imaging apparatus in which the radiation source and the radiation detector are independent, the first distance cannot be measured in advance because the first distance varies each time the radiographer prepares for radiation imaging.
- JP-A-2017-136300 and JP-A-2018-196791 do not describe a specific method for obtaining the first distance. Therefore, the techniques described in JP-A-2017-136300 and JP-A-2018-196791 cannot accurately determine the body thickness of the subject.
- An object of the technology of the present disclosure is to provide an information processing device, an information processing method, a program, and a radiation imaging system that enable accurate determination of the body thickness of a subject.
- an information processing apparatus of the present disclosure is a radiography system that includes a radiation source and a radiation image detector that is irradiated with radiation from the radiation source and has a detection surface on which a subject is positioned.
- An information processing device that performs a process of deriving the body thickness of a subject, the processor comprising a distance generated by photographing a photographing range including the subject and a detection surface with a distance image photographing device
- a depth image acquisition process for acquiring an image
- a detection plane area search process for searching a detection plane area where a part of the detection plane exists from the depth image, and a distance image of the detected detection plane area based on the depth image.
- a first distance acquisition process for acquiring a first distance from the imaging device to the detection surface
- a second distance acquisition process for acquiring a distance from the distance image imaging device to the subject as a second distance based on the distance image
- body thickness derivation processing for deriving the difference between the distance and the second distance as the body thickness of the subject
- the processor preferably acquires, as the second distance, the distance of the radiation center coordinates corresponding to the center of the beam of radiation emitted from the radiation source toward the subject, based on the distance image.
- the processor preferably derives the radiation center coordinates based on the relative positional relationship between the range imaging device and the radiation source.
- the processor sets a region of interest in which the detection plane region is estimated to exist based on a temporary set value provisionally set as a value corresponding to the first distance and the size of the detection plane.
- the detection surface area is searched using the set attention area as the search range.
- the processor excludes abnormal pixels having abnormal pixel values from the region of interest, and derives a region having the maximum distance from the region of interest from which the abnormal pixels are excluded as the detection plane region. preferably.
- the region of interest is preferably a region including the edge of the radiographic image detector and the background outside the radiographic image detector.
- the processor can exclude from the region of interest pixels corresponding to the background whose distance is greater than or equal to a certain value, and flying pixels appearing at the boundary between the edge and the background, as abnormal pixels. preferable.
- the processor preferably sets the position of the region of interest in the detection plane region search process according to the imaging part of the subject.
- the range image capturing device is preferably a TOF type range image camera.
- a radiography system of the present disclosure is a radiography system including any of the information processing devices described above, and determines radiography conditions based on the body thickness derived by the body thickness derivation process.
- the determined radiation imaging conditions can be changed by the user's operation.
- the information processing method of the present disclosure is used in a radiography system that includes a radiation source and a radiation image detector that is irradiated with radiation from the radiation source and has a detection surface on which a subject is positioned. obtaining a distance image generated by photographing a photographing range including a subject and a detection plane with a distance image photographing device; detecting a portion of the detection plane existing Searching for a surface area from a distance image; Acquiring the distance of the searched detection surface area based on the distance image as a first distance from the distance image photographing device to the detection surface; Based on the distance image, the distance image photographing device to the object as the second distance, and deriving the difference between the first distance and the second distance as the body thickness of the object.
- a program of the present disclosure is used in a radiography system that includes a radiation source and a radiographic image detector that is irradiated with radiation from the radiation source and has a detection surface on which a subject is positioned, and derives the body thickness of the subject.
- an information processing device an information processing method, a program, and a radiation imaging system that enable accurate determination of the body thickness of a subject.
- FIG. 1 is a block diagram showing an example of the hardware configuration of an X-ray imaging system
- FIG. 4 is a block diagram showing an example of the functional configuration of an X-ray imaging condition determination unit
- FIG. It is a figure which shows an example of the distance image produced
- FIG. 10 is a diagram illustrating details of an example of attention area setting processing by a detection surface area searching unit; It is a figure explaining an example of body thickness derivation processing.
- FIG. 5 is a diagram showing an example of an imaging condition table; It is a figure which shows an example of the flow of a process by an X-ray imaging system. It is a figure which shows an example of attention area information.
- FIG. 10 is a diagram showing a modified example of the photographing condition table;
- FIG. 10 is a diagram showing a modification of the flow of processing by the X-ray imaging system;
- FIG. 1 shows an example of the configuration of an X-ray imaging system 2 that uses X-rays as radiation.
- An X-ray imaging system 2 using X-rays as radiation includes an X-ray source 10 , an X-ray image detector 20 , a console 30 and a repeater 50 .
- a range image camera 40 is attached to the X-ray source 10 .
- Console 30 communicates with X-ray source 10 , X-ray image detector 20 , and range image camera 40 via repeater 50 .
- the repeater 50 functions, for example, as an access point.
- the X-ray source 10 is an example of a radiation source that generates radiation.
- the X-ray image detector 20 is an example of a "radiation image detector" that detects radiation and generates a radiation image.
- the X-ray source 10, the X-ray image detector 20, and the console 30 of this embodiment are all small and portable devices.
- the X-ray imaging system 2 of the present embodiment can be carried to a site requiring emergency medical care such as an accident or disaster, or to the home of a patient receiving home medical care to perform X-ray imaging.
- the X-ray image detector 20 is arranged at a position where its detection surface 20A faces the X-ray source 10 .
- the imaging region of the subject H can be X-rayed.
- the imaging part of the subject H is the abdomen.
- the X-ray source 10 is held by a holding device 60, for example.
- the holding device 60 is, for example, quadrupedal with four support legs 61 and a crossbar 62 .
- the upper ends of the support legs 61 and both ends of the cross bar 62 are connected to a three-pronged joint 63 to assemble the holding device 60 .
- the horizontal bar 62 is provided with fixtures 64 for mechanically mounting the X-ray source 10 .
- the X-ray source 10 is suspended by a fixture 64 so that the irradiation direction of the X-rays 4 is directed downward.
- An irradiation switch 11 is connected to the X-ray source 10 via a cable 11A.
- a user such as a radiologist or a doctor using the X-ray imaging system 2 can cause the X-ray source 10 to start emitting X-rays 4 by operating the irradiation switch 11 .
- the X-ray image detector 20 has an automatic X-ray detection function that detects the start of irradiation of the X-rays 4 emitted from the X-ray source 10 . Therefore, the X-ray image detector 20 does not need to be connected to the X-ray source 10 . Moreover, since the X-ray image detector 20 has a built-in battery and a wireless communication function, it does not need a power source or connection with the console 30 via a cable. The X-ray image detector 20 is wirelessly connected to the repeater 50 and communicates with the console 30 via the repeater 50 .
- the console 30 is composed of, for example, a personal computer, and has a display section 31 and an input operation section 32.
- the console 30 is connected to the repeater 50 via a communication cable 51, for example.
- the display unit 31 is a display device such as a liquid crystal display or an organic EL (Electro Luminescence) display.
- the input operation unit 32 is an input device including a keyboard, mouse, touchpad, or the like.
- the console 30 is an example of an “information processing device” according to the technology of the present disclosure.
- the display unit 31 displays an X-ray image received by the console 30 from the X-ray image detector 20 .
- the range image camera 40 is arranged, for example, in the vicinity of the irradiation field limiter 17 included in the X-ray source 10 .
- the range image camera 40 is a TOF (Time Of Flight) type range image camera.
- the range image camera 40 emits illumination light such as infrared rays toward the object to be photographed, and measures the time from when the illumination light is emitted to when the reflected light is received. Measure the distance between 40 and the object to be photographed.
- the range image camera 40 emits amplitude-modulated illumination light such as infrared rays toward the object to be photographed, and the distance between the depth image camera 40 and the object to be photographed is determined based on the phase delay amount of the reflected light with respect to the illumination light. You can measure the distance.
- the distance image camera 40 may be a laser scanning TOF camera that measures the distance by scanning the object to be photographed with a laser beam.
- the distance image captured by the distance image camera 40 has distance information representing the distance between the distance image camera 40 and the subject for each pixel.
- a distance image is an image having distance information that enables derivation of the distance to the object to be photographed.
- the range image camera 40 is an example of a "range image photographing device" according to the technology of the present disclosure.
- the range image camera 40 captures a range image with an area including the imaging region of the subject H and the detection surface 20A of the X-ray image detector 20 as the imaging range 41.
- the imaging range 41 is a rectangular area larger than the detection surface 20A.
- the X-ray source 10 and the range image camera 40 are wirelessly connected to the repeater 50 and communicate with the console 30 via the repeater 50 .
- a distance image DP (see FIG. 2) generated by the distance image camera 40 is transmitted to the console 30 via the repeater 50 .
- the console 30 derives the body thickness of the subject H at the imaging site (hereinafter simply referred to as the body thickness of the subject H) based on the depth image DP received from the depth image camera 40 .
- the console 30 also determines the X-ray imaging conditions SC based on the derived body thickness, and transmits the determined X-ray imaging conditions SC to the X-ray source 10 via the repeater 50 .
- the X-ray imaging conditions SC include tube voltage, tube current-time product, and the like.
- the X-ray source 10 generates X-rays 4 based on the X-ray imaging conditions SC received from the console 30 and emits the generated X-rays 4 toward the X-ray image detector 20 .
- FIG. 2 shows an example of the hardware configuration of the X-ray imaging system 2.
- FIG. The X-ray source 10 has a processor 12 , an input operation section 13 , a communication I/F (interface) 14 , a high voltage generator 15 , an X-ray tube 16 and an irradiation field limiter 17 .
- the processor 12 functions as a controller that controls the operations of the high voltage generator 15 and the irradiation field limiter 17 .
- the above-described irradiation switch 11 is connected to the processor 12 .
- An input operation unit 13 is also connected.
- the input operation unit 13 includes an imaging condition adjustment button for manually setting the tube voltage and the tube current-time product of the X-ray tube 16 , and an irradiation field for adjusting the size of the irradiation field of the irradiation field limiter 17 . button, power button, and the like.
- the processor 12 controls the high voltage generator 15 and the irradiation field limiter 17 based on the setting conditions set by the input operation unit 13 .
- the processor 12 causes the high voltage generator 15 to generate a high voltage in response to the operation of the irradiation switch 11 .
- Communication I/F 14 is wirelessly connected to repeater 50 .
- the X-ray tube 16 is, for example, a fixed anode type X-ray tube that does not have a target rotation mechanism.
- the X-ray tube 16 is composed of a cold cathode electron source that emits electrons, an electron accelerator, a target that generates X-rays 4 by electron collision, and an outer tube that accommodates these.
- a cold cathode electron source does not require a filament and a heater for heating it, unlike a hot cathode.
- the X-ray tube 16 has no target rotation mechanism, no filament, and no heater, so it is compact and lightweight.
- the X-ray tube 16 does not require preheating of the filament, it is possible to generate the X-rays 4 in immediate response to the irradiation start instruction.
- the irradiation field limiter 17 limits the irradiation field of the X-rays 4 generated by the X-ray tube 16 .
- the X-rays 4 generated by the X-ray tube 16 are limited in the irradiation field by the irradiation field limiter 17, and are irradiated to the part of the subject H to be imaged.
- the X-rays 4 passing through the imaging region of the subject H enter the X-ray image detector 20 .
- the range image camera 40 is connected to the communication I/F 14 of the X-ray source 10, for example.
- the distance image camera 40 transmits the distance image DP generated by photographing the photographing range 41 (see FIG. 1) to the console 30 via the communication I/F 14 and the repeater 50 .
- the X-ray source 10 and the range image camera 40 can also be connected to the repeater 50 via a communication cable.
- the X-ray image detector 20 has a processor 21, an X-ray detection panel 22, a memory 23, and a communication I/F 24.
- the processor 21 functions as a control section that controls each section within the X-ray image detector 20 .
- the X-ray detection panel 22 is, for example, a flat panel detector having a matrix substrate on which a plurality of pixels composed of thin film transistors (TFTs) and X-ray detection elements are two-dimensionally arranged.
- TFTs thin film transistors
- the X-ray detection panel 22 converts incident X-rays into charges with the X-ray detection elements in a charge accumulation state in which the TFTs are turned off, and accumulates the charges.
- the charge accumulated in the X-ray detection element is read out to the signal processing circuit in the charge readout state in which the TFT is turned on.
- an integrating amplifier converts the read charge into a voltage signal
- an A/D converter A/D converts the converted voltage signal to generate digital image data.
- This image data is hereinafter referred to as an X-ray image XP.
- the memory 23 is a non-volatile memory such as flash memory, and stores the X-ray image XP generated by the X-ray detection panel 22 .
- Communication I/F 24 is wirelessly connected to repeater 50 .
- the processor 21 transmits the X-ray image XP stored in the memory 23 to the console 30 via the repeater 50 .
- the X-ray image detector 20 can also be connected to the repeater 50 via a communication cable.
- the console 30 includes a display unit 31, an input operation unit 32, a processor 33, a RAM (Random Access Memory) 34, a non-volatile memory (NVM: Non-Volatile Memory) 35, and a communication I/F 36.
- the processor 33 is, for example, a CPU (Central Processing Unit).
- the RAM 34 is a work memory for the processor 33 to execute processing.
- the NVM 35 is a storage device such as flash memory, and stores the program 37 .
- the console 30 is an example of a "computer" according to the technology of the present disclosure.
- the processor 33 loads a program 37 stored in the NVM 35 into the RAM 34 and executes processing according to the program 37, thereby controlling a console control unit 38 for overall control of each unit of the console 30 and an X-ray imaging condition determination unit. 39.
- the console control unit 38 displays a GUI (Graphical User Interface) screen on the display unit 31, thereby enabling input of patient information, imaging regions, etc. using the input operation unit 32.
- the console control unit 38 also causes the display unit 31 to display the X-ray image XP received from the X-ray image detector 20 .
- the X-ray imaging condition determination unit 39 derives the body thickness of the subject H based on the distance image DP transmitted from the depth image camera 40, and determines the X-ray imaging conditions SC based on the derived body thickness.
- FIG. 3 shows an example of the functional configuration of the X-ray imaging condition determination unit 39.
- the X-ray imaging condition determination unit 39 includes a distance image acquisition unit 70, a detection surface area search unit 71, a first distance acquisition unit 72, a second distance acquisition unit 73, a body thickness derivation unit 74, and a selection unit 75. .
- the X-ray imaging condition determination unit 39 derives the body thickness and X Determines line imaging conditions.
- the distance image acquisition unit 70 performs distance image acquisition processing for acquiring the distance image DP transmitted from the distance image camera 40 .
- the distance image acquisition unit 70 supplies the acquired distance image DP to the detection plane area search unit 71 , the first distance acquisition unit 72 , and the second distance acquisition unit 73 .
- FIG. 4 shows an example of the distance image DP generated by the distance image camera 40.
- the distance image camera 40 generates a distance image DP by photographing an imaging range 41 including the subject H and the detection plane 20A.
- distance is represented by density.
- a region with a higher density in the range image DP indicates a greater distance from the range image camera 40 .
- the distance image camera 40 defines a distance range in which distance measurement is possible, and the first pixel region 80 including pixels whose distance from the distance image camera 40 is a certain value or more is set to the maximum density (for example, black). .
- the distance image camera 40 identifies, as the first pixel area 80, a pixel area showing a distance equal to or greater than a certain value longer than the distance from the distance image camera 40 to the detection surface 20A.
- the depth image camera 40 sets the second pixel region 81 including the flying pixels generated at the edge of the object to the minimum density (for example, white). Flying pixels are "blurry" pixels that appear at the boundary between the object and the background. Flying pixels are known, for example, from patent 6,143,747. In the example shown in FIG. 4, the second pixel area 81 is generated at the boundary between the edge of the X-ray image detector 20 and the background and the boundary between the subject H and the background.
- the minimum density for example, white
- Flying pixels are "blurry" pixels that appear at the boundary between the object and the background. Flying pixels are known, for example, from patent 6,143,747.
- the second pixel area 81 is generated at the boundary between the edge of the X-ray image detector 20 and the background and the boundary between the subject H and the background.
- the identification and density change of the first pixel region 80 and the second pixel region 81 from the range image DP are not limited to the range image camera 40, and may be performed inside the console 30.
- the detection surface area search unit 71 performs detection surface area search processing for searching the detection surface area DA (see FIG. 5) in which a part of the detection surface 20A exists from the distance image DP.
- FIGS. 5 and 6 explain an example of the detection plane area search process.
- the detection plane area searching unit 71 sets an attention area ROI in an area in which the detection plane area DA is estimated to exist in the distance image DP, and uses the set attention area ROI as a search range.
- Search area DA For example, the region of interest ROI is rectangular. Also, the region of interest ROI is smaller than the region corresponding to the detection surface 20A.
- the region of interest ROI is a region including the edge of the X-ray image detector 20 and the background outside the X-ray image detector 20 .
- the detection surface area searching unit 71 sets the attention area ROI so as to include the corners of the detection surface 20A. Moreover, in the example shown in FIG. 5, the imaging part of the subject H is the abdomen, and a part of the detection surface 20A is exposed on both sides of the subject H's hips. For this reason, the detection plane region searching unit 71 sets a pair of attention regions ROI at positions corresponding to the corners of the detection plane 20A on both sides of the subject H's waist. Note that the detection plane region searching unit 71 may set at least one region of interest ROI within the distance image DP.
- the detection surface region searching unit 71 excludes abnormal pixels having abnormal pixel values from the region of interest ROI. Specifically, the detection surface region searching unit 71 excludes the first pixel region 80 with the maximum density and the second pixel region 81 with the minimum density from the region of interest ROI. Next, the detection surface area searching unit 71 derives an area having the maximum distance among the areas from which the abnormal pixels are excluded in the attention area ROI as the detection surface area DA. A part of the subject H may be included in the region from which the abnormal pixels are excluded. However, the subject H exists closer to the range image camera 40 than the detection plane 20A, so the distance to the subject H is shorter than that of the detection plane 20A. Therefore, the detection surface area DA corresponds to the detection surface 20A.
- the detection surface area search unit 71 searches for the detection surface area DA from each attention area ROI.
- the first distance acquisition unit 72 acquires the distance of the detection surface area DA searched by the detection surface area search unit 71 as a first distance D1 from the distance image camera 40 to the detection surface 20A. Perform distance acquisition processing. Note that when the detection surface area search unit 71 extracts a plurality of detection surface areas DA and the distances differ for each detection surface area DA, the first distance acquisition unit 72 acquires the maximum distance as the first distance D1. do.
- FIG. 7 explains the details of the attention area ROI setting process by the detection surface area search unit 71.
- the area in the range image DP where the detection plane area DA is estimated to exist depends on the distance from the range image camera 40 to the detection plane 20A and the size of the detection plane 20A. Therefore, in the present embodiment, the detection surface area searching unit 71 sets the attention area ROI based on the temporary set value D1T and the panel size L stored in the NVM 35 .
- the provisional set value D1T is a value provisionally set in advance as a value corresponding to the first distance D1.
- the panel size L corresponds to the size of the detection surface 20A, and represents, for example, the length of the detection surface 20A in the X direction.
- the temporary set value D1T is set based on the sizes of the holding device 60 and the X-ray source 10 .
- the provisional set value D1T and the panel size L may be set by the user using the input operation unit 32 .
- the distance image camera 40 includes a light source 42 that emits illumination light 42A such as infrared rays toward the imaging range 41, and an imaging sensor 43 that receives reflected light 43A from the imaging range 41.
- the imaging range 41 corresponds to the viewing angle ⁇ of the imaging sensor 43 .
- the detection surface area searching unit 71 obtains the position corresponding to the corner of the detection surface 20A from the geometrical relationship, and searches the attention area so as to include the corner of the detection surface 20A. Set the ROI.
- the second distance acquisition unit 73 performs second distance acquisition processing for acquiring the distance from the distance image camera 40 to the subject H as the second distance D2 based on the distance image DP. Specifically, as shown in FIG. 8, the second distance acquisition unit 73 calculates the distance of the X-ray center coordinate C corresponding to the center of the bundle of X-rays 4 emitted from the X-ray source 10 toward the subject H. is obtained as the second distance D2. More specifically, the second distance acquisition unit 73 obtains the relative position information RT (see FIG. 3) representing the relative positional relationship (see FIG.
- the second distance acquisition unit 73 may derive the X-ray central coordinate C using the temporary set value D1T instead of the first distance D1.
- the X-ray center coordinates C are an example of "radiation center coordinates" according to the technology of the present disclosure.
- the body thickness derivation unit 74 uses the difference between the first distance D1 acquired by the first distance acquisition unit 72 and the second distance D2 acquired by the second distance acquisition unit 73 as the body thickness BT (see FIG. 9). Body thickness derivation processing is performed. Specifically, as shown in FIG. 9, the body thickness deriving section 74 derives the body thickness BT by subtracting the second distance D2 from the first distance D1.
- the selection unit 75 determines the X-ray imaging condition SC based on the body thickness BT derived by the body thickness derivation unit 74. Specifically, the selection unit 75 selects the body thickness BT and the X-ray imaging conditions SC corresponding to the imaging region indicated by the imaging region information SP from the imaging condition table ST stored in the NVM 35, The imaging conditions SC are output to the X-ray source 10 .
- the imaging part information SP may be set by the user using the input operation unit 32 .
- the X-ray imaging condition SC is an example of the "radiation imaging condition" according to the technology of the present disclosure.
- FIG. 10 shows an example of the shooting condition table ST.
- body thickness BT and X-ray imaging conditions SC are associated with each imaging region.
- the selection unit 75 selects, from the imaging condition table ST, the body thickness BT derived by the body thickness deriving unit 74 and the X-ray imaging conditions SC most suitable for the imaging region represented by the imaging region information SP.
- the X-ray imaging conditions SC are defined, for example, by the tube voltage and the tube current-time product of the X-ray tube 16 .
- a user Prior to imaging, a user such as a doctor performs an operation to input patient information, imaging region information SP, and the like to the X-ray source 10 and the console 30, and then the imaging region of the subject H is detected by the X-ray image detector 20. is positioned with respect to the detection surface 20A.
- the range image DP is captured by the range image camera 40 (step S11).
- a distance image DP is transmitted from the distance image camera 40 to the console 30 .
- the distance image acquisition unit 70 performs distance image acquisition processing for acquiring the distance image DP transmitted from the distance image camera 40 (step S12).
- the detection surface area search unit 71 performs detection surface area search processing for searching the distance image DP for a detection surface area DA in which a part of the detection surface 20A exists. (Step S13).
- the first distance obtaining section 72 obtains the distance of the detection surface area DA searched by the detection surface area searching section 71 as the first distance D1 from the distance image camera 40 to the detection surface 20A. (step S14).
- the second distance acquisition unit 73 performs second distance acquisition processing for acquiring the distance from the distance image camera 40 to the subject H as the second distance D2 based on the distance image DP (step S15).
- the body thickness derivation unit 74 performs body thickness derivation processing for deriving the difference between the first distance D1 and the second distance D2 as the body thickness BT (step S16).
- the selection section 75 Based on the body thickness BT derived by the body thickness deriving section 74, the selection section 75 performs an imaging condition selection process of selecting the X-ray imaging conditions SC from the imaging condition table ST (step S17). The X-ray imaging conditions SC selected by the selector 75 are transmitted to the X-ray source 10 .
- step S18 when the user operates the irradiation switch 11 to instruct the X-ray source 10 to start irradiation of the X-rays 4 (step S18: YES), the X-ray source 10 receives the X-rays received from the console 30. X-rays 4 are irradiated using radiographic conditions SC (step S19). That is, X-ray imaging is performed. Steps S11 to S18 are repeatedly executed until the user issues a photographing instruction. That is, when the body thickness BT changes due to changes in the state of the subject H, the X-ray imaging conditions SC are changed.
- the detection surface area DA is searched from the distance image DP, the distance of the detected detection surface area DA is acquired as the first distance D1, and the first distance D1 and the second distance D2 are obtained. Deriving the body thickness BT derived based on Therefore, the body thickness of the subject can be obtained with high accuracy. Therefore, according to the technique of the present disclosure, even a user unfamiliar with X-ray imaging can easily perform X-ray imaging with an appropriate dose.
- the distance from the X-ray source 10 to the detection surface 20A (that is, SID) is preset in the X-ray imaging system 2, then the distance from the X-ray source 10 to the subject H (that is, SOD) It is possible to measure the body thickness of the subject H by measuring .
- most portable radiation imaging systems such as the X-ray imaging system 2 of the above embodiment do not hold SID information. Information may differ. If the actual SID is different from the SID information, the measurement accuracy of the body thickness of the subject is lowered.
- the body thickness is derived based on the first distance D1 and the second distance D2 described above without depending on the SID information, so the body thickness can be obtained with high accuracy.
- the detection surface area DA is detected from the attention area ROI set at the position corresponding to the edge of the detection surface 20A. It is also conceivable to set the region of interest ROI so as to include the entire detection surface 20A. However, the portion of the subject H protruding outside the detection surface 20A (hand portion in FIG. 8) is located on the far side (+Z direction side) of the detection surface 20A when viewed from the range image camera 40 side. There is In such a case, if the region of interest ROI is set so as to include the entire detection surface 20A, there is a possibility that the distance of the part protruding outside the detection surface 20A will be erroneously detected as the first distance D1. In order to suppress such erroneous detection, in the above embodiment, a region of interest ROI smaller than the region corresponding to the detection surface 20A is set at the position corresponding to the edge of the detection surface 20A.
- the detection plane region search unit 71 detects the region of interest ROI at a position corresponding to the corner of the lower side ( ⁇ Y direction side) of the detection plane 20A on the premise that the imaged part of the subject H is the abdomen. is set (see FIG. 5).
- the detection surface region searching unit 71 may change the position of the region of interest ROI according to the part of the subject H to be photographed.
- attention area information RS in which the imaged part and the position of the attention area ROI are associated with each other may be stored in the NVM 35 in advance.
- the detection surface area searching unit 71 may select the position of the region of interest ROI corresponding to the imaging part based on the imaging part information SP.
- the region-of-interest information RS contains information representing the position of the region-of-interest ROI corresponding to the case where the region to be imaged is the abdomen, and the position of the region-of-interest ROI corresponding to the case where the region to be imaged is the front of the chest. and information representing When the imaged part is the front of the chest, the upper (+Y direction) corner of the detection surface 20A is exposed without being covered by the subject H.
- a region of interest ROI is associated.
- the region-of-interest information RS is not limited to the abdomen and the front of the chest, and may include information representing the position of the region-of-interest ROI for other imaging regions such as the side of the chest and the buttocks.
- the body thickness BT and X-ray imaging conditions SC are associated with each imaging part in the imaging condition table ST. may be associated with body thickness BT and X-ray imaging conditions SC.
- the physique of the subject H is classified into three categories of "large”, “medium”, and “small”, and the range of the body thickness BT and the X-ray imaging conditions SC are determined for each category. may be associated.
- information representing the physique corresponding to the X-ray imaging conditions SC selected by the selection unit 75 may be displayed on the display unit 31 of the console 30 .
- the user may use the input operation unit 32 to select a physical build, thereby setting the X-ray imaging conditions SC corresponding to the selected physical build.
- the selection unit 75 outputs the X-ray imaging conditions SC selected from the imaging condition table ST to the X-ray source 10, but the selected X-ray imaging conditions SC are , the X-ray imaging conditions SC selected by the user using the input operation unit 32 may be output to the X-ray source 10 .
- step S20 the selection unit 75 causes the display unit 31 of the console 30 to display the X-ray imaging conditions SC selected from the imaging condition table ST.
- the selection unit 75 causes the display unit 31 to display the photographing condition table ST shown in FIG. 10 or 13 .
- the user can select the X-ray imaging conditions SC to be used for X-ray imaging based on the imaging condition table ST while referring to the X-ray imaging conditions SC selected by the selection unit 75 . That is, the user can change the X-ray imaging conditions SC selected by the selection unit 75 to different X-ray imaging conditions SC.
- the selection unit 75 determines whether or not the user has selected the X-ray imaging condition SC using the input operation unit 32 (step S21). When the X-ray imaging condition SC is selected by the user (step S21: YES), the selector 75 outputs the selected X-ray imaging condition SC to the X-ray source 10 (step S22). If the user does not select the X-ray imaging condition SC (step S21: NO), the process proceeds to step S18. Other processing is the same as in the above embodiment.
- the distance image camera 40 is of the TOF method. It can be a camera.
- the X-ray imaging system 2 is a portable radiography system, but the technology of the present disclosure is not limited to a portable radiography system, and can be applied to various radiography systems. The technology of the present disclosure is particularly suitable for radiographic systems that do not hold SID information.
- the X-ray imaging system 2 may, for example, use a mobile medical vehicle. Further, the X-ray imaging system 2 may be a floor-traveling general X-ray imaging system. The posture of the subject H is not limited to the lying position, and may be the standing position. Also, the X-ray imaging system 2 may be a mammography apparatus for imaging a breast as the subject H.
- the technology of the present disclosure can be applied not only to X-rays, but also to systems that use other radiation such as ⁇ -rays to image a subject.
- the distance image acquisition unit 70, the detection surface area search unit 71, the first distance acquisition unit 72, the second distance acquisition unit 73, the body thickness derivation unit 74, and the selection unit 75 perform various processes.
- the hardware structure of the processing unit for processing is various processors as shown below.
- processors include CPUs, programmable logic devices (PLDs), dedicated electric circuits, and so on.
- the CPU is a general-purpose processor that executes software (programs) and functions as various processing units.
- a PLD is a processor such as an FPGA (Field Programmable Gate Array) whose circuit configuration can be changed after manufacturing.
- a dedicated electric circuit is a processor, such as an ASIC (Application Specific Integrated Circuit), having a circuit configuration specially designed to execute specific processing.
- One processing unit may be composed of one of these various processors, or composed of a combination of two or more processors of the same type or different types (for example, a plurality of FPGAs or a combination of a CPU and an FPGA).
- a plurality of processing units may be configured by one processor.
- a plurality of processing units may be configured by one processor.
- SoC System On Chip
- the hardware structure of these various processors is, more specifically, an electrical circuit that combines circuit elements such as semiconductor elements.
- the present invention is not limited to the above embodiments, and various configurations can be adopted as long as they do not deviate from the gist of the present invention.
- the present invention also extends to a computer-readable storage medium that non-temporarily stores the program.
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Abstract
Description
次に、上記実施形態に係るX線撮影システム2の各種変形例について説明する。
してもよい。複数の処理部を1つのプロセッサで構成する例としては、第1に、1つ以上のCPUとソフトウェアの組み合わせで1つのプロセッサを構成し、このプロセッサが複数の処理部として機能する形態がある。第2に、システムオンチップ(SoC:System On Chip)等に代表されるように、複数の処理部を含むシステム全体の機能を1つのICチップで実現するプロセッサを使用する形態がある。このように、各種の処理部は、ハードウェア的な構造として、上記各種のプロセッサを1つ以上用いて構成される。
Claims (13)
- 放射線源と、前記放射線源からの放射線が照射され、かつ、被写体が位置決めされる検出面を有する放射線画像検出器とを備える放射線撮影システムに用いられ、前記被写体の体厚を導出する処理を行う情報処理装置であって、
プロセッサを備え、
前記プロセッサは、
前記被写体及び前記検出面を含む撮影範囲を距離画像撮影装置で撮影することにより生成された距離画像を取得する距離画像取得処理と、
前記検出面の一部が存在する検出面領域を前記距離画像から探索する検出面領域探索処理と、
前記距離画像に基づき、探索した前記検出面領域の距離を、前記距離画像撮影装置から前記検出面までの第1距離として取得する第1距離取得処理と、
前記距離画像に基づき、前記距離画像撮影装置から前記被写体までの距離を第2距離として取得する第2距離取得処理と、
前記第1距離と前記第2距離の差を前記被写体の体厚として導出する体厚導出処理と、
を実行する情報処理装置。 - 前記プロセッサは、
前記第2距離取得処理において、
前記距離画像に基づき、前記放射線源から前記被写体に向けて照射される放射線の線束の中心に対応する放射線中心座標の距離を、前記第2距離として取得する、
請求項1に記載の情報処理装置。 - 前記プロセッサは、
前記第2距離取得処理において、前記距離画像撮影装置と前記放射線源との相対的な位置関係に基づいて前記放射線中心座標を導出する、
請求項2に記載の情報処理装置。 - 前記プロセッサは、
前記検出面領域探索処理において、
前記第1距離に対応する値として仮に設定された仮設定値と、前記検出面の大きさとに基づいて、前記検出面領域が存在すると推定される注目領域を設定し、
設定した前記注目領域を探索範囲として前記検出面領域を探索する、
請求項1から請求項3のうちいずれか1項に記載の情報処理装置。 - 前記プロセッサは、
前記検出面領域探索処理において、
前記注目領域から画素値が異常である異常画素を除外し、
前記注目領域から前記異常画素が除外された領域のうち、
距離が最大となる領域を検出面領域として導出する、
請求項4に記載の情報処理装置。 - 前記注目領域は、前記放射線画像検出器の端部と、前記放射線画像検出器の外側の背景とを含む領域である、
請求項5に記載の情報処理装置。 - 前記プロセッサは、
前記検出面領域探索処理において、
距離が一定値以上であって前記背景に対応する画素と、前記端部と前記背景との境界部分に現れるフライングピクセルとを、前記異常画素として前記注目領域から除外する、
請求項6に記載の情報処理装置。 - 前記プロセッサは、
前記検出面領域探索処理において、
前記注目領域の位置を、被写体の撮影部位に応じて設定する、
請求項4から請求項7のうちいずれか1項に記載の情報処理装置。 - 前記距離画像撮影装置は、TOF方式の距離画像カメラである、
請求項1から請求項8のうちいずれか1項に記載の情報処理装置。 - 請求項1から請求項9のうちいずれか1項に記載の情報処理装置を備える放射線撮影システムであって、
前記体厚導出処理により導出された前記体厚に基づいて、放射線撮影条件を決定する、
放射線撮影システム。 - 決定した前記放射線撮影条件を、ユーザの操作により変更可能とする、
請求項10に記載の放射線撮影システム。 - 放射線源と、前記放射線源からの放射線が照射され、かつ、被写体が位置決めされる検出面を有する放射線画像検出器とを備える放射線撮影システムに用いられ、前記被写体の体厚を導出することを含む情報処理方法であって、
前記被写体及び前記検出面を含む撮影範囲を距離画像撮影装置で撮影することにより生成された距離画像を取得すること、
前記検出面の一部が存在する検出面領域を前記距離画像から探索すること、
前記距離画像に基づき、探索した前記検出面領域の距離を、前記距離画像撮影装置から前記検出面までの第1距離として取得すること、
前記距離画像に基づき、前記距離画像撮影装置から前記被写体までの距離を第2距離として取得すること、
前記第1距離と前記第2距離の差を前記被写体の体厚として導出すること、
を含む情報処理方法。 - 放射線源と、前記放射線源からの放射線が照射され、かつ、被写体が位置決めされる検出面を有する放射線画像検出器とを備える放射線撮影システムに用いられ、前記被写体の体厚を導出することを含む処理をコンピュータに実行させるためのプログラムであって、
前記被写体及び前記検出面を含む撮影範囲を距離画像撮影装置で撮影することにより生成された距離画像を取得すること、
前記検出面の一部が存在する検出面領域を前記距離画像から探索すること、
前記距離画像に基づき、探索した前記検出面領域の距離を、前記距離画像撮影装置から前記検出面までの第1距離として取得すること、
前記距離画像に基づき、前記距離画像撮影装置から前記被写体までの距離を第2距離として取得すること、
前記第1距離と前記第2距離の差を前記被写体の体厚として導出すること、
を含む処理をコンピュータに実行させるためのプログラム。
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