Information processing device, radiation irradiation device, information processing method, and information processing program

Abstract

This information processing device is provided with at least one processor that performs: a process for acquiring an optical image obtained by optically capturing an image of a subject; determining the position of a region of interest according to the optical image; a first mark indicating a center position of an irradiation field of radiation and a second mark indicating a predetermined position for the specified region of interest when radiographic imaging is performed on the subject from substantially the same direction as the imaging direction of the optical imaging are performed on the optical image and are displayed on a display. The first mark indicates the center position of the irradiation field of the radiation, and the second mark indicates a predetermined position for the specified region of interest. And controlling.

Description

Technical Field

[0001] The present invention relates to an information processing apparatus, a radiation irradiation apparatus, an information processing method, and an information processing program. Background Art

[0002] Conventionally, the following technique has been known: in radiography, positioning is assisted based on an optical image obtained by optically photographing a subject. For example, Japanese Patent Application Laid-Open No. 2014-117368 discloses the following: guidance is performed in such a manner that the same imaging conditions and imaging under the same positioning as the past imaging can be reproduced at the current time based on the optical image and imaging conditions of the subject at a past time point. Summary of the Invention

[0003] Technical Problem to be Solved by the Invention

[0004] In recent years, in order to stabilize the quality of radiation images, a technique for assisting imaging in a positioning method specified in advance such as a guideline has been required.

[0005] The present invention provides an information processing apparatus, a radiation irradiation apparatus, an information processing method, and an information processing program that can assist positioning in radiation imaging.

[0006] Means for Solving the Technical Problem

[0007] A first aspect of the present invention is an information processing apparatus including at least one processor,

[0008] and the processor performs the following processing:

[0009] acquiring an optical image obtained by optically photographing a subject;

[0010] determining the position of a region of interest based on the optical image; and

[0011] performing control to overlap a first marker indicating the central position of the irradiation field of radiation when irradiating the subject with radiation from a direction substantially the same as the imaging direction of the optical imaging and a second marker indicating a position specified in advance for the determined region of interest on the optical image and display the overlapped image on a display.

[0012] In the first aspect, the processor may perform the following processing: acquiring a photographing command specified in advance for the type of the region of interest of the photographing object; and performing control to overlap the second marker indicating a position specified in advance for the type of the region of interest specified in the photographing command on the optical image and display the overlapped image on a display.

[0013] In the above first mode, the processor may perform the following processes: receiving an input of the type of the region of interest for the photographic object; and performing control to overlap a second marker indicating a position preset according to the type of the input region of interest on the optical image and display it on the display.

[0014] In the above first mode, the processor may perform the following control: overlapping a third marker indicating the radiation detection region in the radiation detector that generates a radiation image of the subject by detecting the radiation transmitted through the subject on the optical image and displaying it on the display.

[0015] In the above first mode, the processor may perform the following processes: obtaining distance information indicating the distance between the radiation source and the radiation detector of the radiation; deriving the size of the detection region based on the distance information; and performing control to overlap a third marker corresponding to the size of the derived detection region on the optical image and display it on the display.

[0016] In the above first mode, the processor may perform the following processes: determining the position of the radiation detector in the optical image; and performing control to overlap a third marker corresponding to the determined position of the radiation detector on the optical image and display it on the display.

[0017] In the above first mode, the processor may perform the following processes: obtaining an optical image obtained by optically photographing the radiation detector that has been marked with a detection region representing radiation together with the subject; and determining the position of the radiation detector in the optical image based on the marker included in the optical image.

[0018] In the above first mode, the processor may use a positioning sensor provided in the radiation detector to determine the position of the radiation detector in the optical image.

[0019] In the above first mode, the processor may perform the following processes: obtaining a representative optical image obtained by optically photographing the subject within a preset period including the time point when the subject is irradiated with radiation; obtaining a radiation image from the radiation detector that detects the radiation transmitted through the subject and generates a radiation image of the subject; performing control to display the representative optical image on the display during a first period from when the representative optical image is obtained until the radiation image is obtained; and performing control to display the radiation image on the display during a second period after the radiation image is obtained.

[0020] In the above first mode, the processor may perform the following control: during the first period, performing control to display on the display the region in the representative optical image corresponding to the region included in the radiation image.

[0021] In the above-described first mode, the processor may perform the following processes: acquiring information representing an irradiation period from the start time point to the end time point of the irradiation of radiation on a subject; instructing a photographing device representing an optical image to optically photograph the subject at a shutter speed corresponding to the irradiation period; and acquiring from the photographing device the optical image representing the subject optically photographed at the shutter speed corresponding to the irradiation period.

[0022] In the above-described first mode, the processor may perform the following processes: storing the acquired optical image in a storage unit, and after acquiring a radiation image from a radiation detector that detects radiation transmitted through the subject and generates a radiation image of the subject, deleting the optical image stored in the storage unit.

[0023] A second mode of the present invention is a mobile radiation irradiation device, which includes: the information processing device according to the above-described first mode; a radiation source that irradiates a subject with radiation; and a photographing device that optically photographs the subject.

[0024] A third mode of the present invention is an information processing method, which includes the following processes: acquiring an optical image obtained by optically photographing a subject; determining the position of a region of interest based on the optical image; and performing control to overlap a first marker representing the central position of the irradiation field of radiation when radiographically photographing the subject from a direction substantially the same as the photographing direction of the optical photographing and a second marker representing a position preset for the determined region of interest on the optical image and display the overlapped image on a display.

[0025] A fourth mode of the present invention is an information processing program for causing a computer to perform the following processes: acquiring an optical image obtained by optically photographing a subject; determining the position of a region of interest based on the optical image; and performing control to overlap a first marker representing the central position of the irradiation field of radiation when radiographically photographing the subject from a direction substantially the same as the photographing direction of the optical photographing and a second marker representing a position preset for the determined region of interest on the optical image and display the overlapped image on a display.

[0026] Advantages of the Invention

[0027] According to the above-described modes, the information processing device, radiation irradiation device, information processing method, and information processing program of the present invention can assist in positioning during radiographic imaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 FIG. is an example showing a schematic configuration of a photographing system.

[0029] Figure 2 FIG. is a perspective view showing an example of a usage mode of the radiation irradiation device.

[0030] Figure 3 It is an external perspective view showing an example of the structure of a radiation irradiation device.

[0031] Figure 4 It is an external perspective view showing an example of the structure of a radiation irradiation device.

[0032] Figure 5 It is a block diagram showing an example of the hardware structure of a radiation irradiation device.

[0033] Figure 6 It is a diagram for explaining the processing content of a control device.

[0034] Figure 7 It is an example of a screen displayed on a display.

[0035] Figure 8 It is an example of a screen displayed on a display.

[0036] Figure 9 It is an example of a screen displayed on a display.

[0037] Figure 10 It is an example of a screen displayed on a display.

[0038] Figure 11 It is an example of another form of the first mark and the second mark.

[0039] Figure 12 It is an example of a screen displayed on a display.

[0040] Figure 13 It is an example of a screen displayed on a display.

[0041] Figure 14 It is a flowchart showing an example of control processing. Detailed Embodiments

[0042] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, refer to Figure 1 to describe the structure of the imaging system 1. Figure 1 It is a diagram showing the schematic structure of the imaging system 1. As Figure 1 shown, the imaging system 1 includes a radiation irradiation device 10 and a console 4. The radiation irradiation device 10 and the console 4, and the console 4 and an external RIS (Radiology Information System) 6 are configured to be connectable via a wired or wireless network.

[0043] The control console 4 obtains shooting instructions and the like from the RIS 6, and controls the radiation irradiation device 10 according to the obtained shooting instructions and the instructions of the user and the like. The radiation irradiation device 10 takes a radiation image of the subject according to the control of the control console 4 and the instructions of the user and the like.

[0044] Next, the radiation irradiation device 10 will be described. In addition, in the following description, for the sake of convenience of explanation, the three arrows X, Y, and Z are used to represent the width direction, the front-rear direction (also referred to as the depth direction), and the height direction of the radiation irradiation device 10, respectively. First, the arrow Z represents the height direction, the arrow Z direction indicated by the arrow Z is set as the upper direction of the radiation irradiation device 10, and the opposite direction thereof is set as the lower direction. The height direction is the vertical direction. The arrow X orthogonal to the arrow Z represents the width direction, the direction indicated by the arrow X is set as the right direction of the radiation irradiation device 10, and the opposite direction thereof is set as the left direction. The arrow Y represents the front-rear direction and is orthogonal to the arrow Z and the arrow X. The direction indicated by the arrow Y is set as the front direction of the radiation irradiation device 10, and the opposite direction thereof is set as the rear direction. That is, in the radiation irradiation device 10, the radiation irradiation direction is the front direction, and the side where the subject A stands (reference Figure 1 ) is the front direction. And hereinafter, the meanings of the notations on the use side such as the upper side, the lower side, the left side, the right side, the front side, and the rear side are also the same as those of the notation of the use direction.

[0045] And in the present embodiment, the "vertical direction" means the vertical direction including the errors generally allowed in the technical field to which the technology of the present invention belongs and not violating the gist of the technology of the present invention, in addition to the completely vertical direction. And the same applies to the "horizontal direction". In addition to the completely horizontal direction, it also refers to the horizontal direction including the errors generally allowed in the technical field to which the technology of the present invention belongs and not violating the gist of the technology of the present invention.

[0046] Figure 2 FIG. shows a perspective view showing an example of the usage mode of the radiation irradiation device 10. As an example, as Figure 2 shown, the radiation irradiation device 10 includes a device main body 11 and a remote operation unit 12. The device main body 11 is a device capable of irradiating the subject A with radiation R. The device main body 11 includes an X-ray tube 15 as a radiation generation source inside, and irradiates the subject A with the radiation (for example, X-rays or γ-rays) generated in the X-ray tube 15 through a collimator, an irradiation window, and the like. The X-ray tube 15 is an example of the "radiation source" related to the technology of the present invention. In addition, here "remote" means the degree of being separated by physical separation, and does not refer to the amount of distance.

[0047] The radiation irradiation device 10 has a portable size and weight. That is, the radiation irradiation device 10 is a mobile radiation irradiation device. The radiation irradiation device 10 can be used, for example, in a medical facility for simple radiation examinations or for radiation examinations during home medical treatments. Moreover, the radiation irradiation device 10 can be used outdoors. For example, the radiation irradiation device 10 can be used for home visits in disaster areas or areas with insufficient medical services.

[0048] The device main body 11 is set, for example, via a tripod 14 at a position (e.g., height and distance) predetermined with respect to the subject A. A fixing portion 17 for fixing the tripod 14 and the device main body 11 is provided on the lower surface of the device main body 11. The fixing portion 17 is, for example, a threaded hole. The fixing portion 17 is located on a straight line L that is orthogonal to the central axis RA of the radiation beam of the radiation R and passes through the focal point F of the X-ray tube 15. The X-ray tube 15 generates the radiation R, for example, by causing electrons released from the cathode to collide with a target. The focal point F is the position where the electrons collide on the target. The radiation beam of the radiation R expands in a conical shape with the focal point F as the base point. The central axis RA is the central axis of such a radiation beam. The fixing portion 17 is provided at the position where the straight line L intersects the lower surface of the device main body 11. In the radiation irradiation device 10, the portion where the focal point F of the X-ray tube 15 is located is close to the center of gravity. By providing the fixing portion 17 on the straight line L, it is easy to stabilize the radiation irradiation device 10 on the tripod 14.

[0049] The remote operation unit 12 is a device capable of remotely operating the device main body 11. The remote operation unit 12 is detachable from the device main body 11. The remote operation unit 12 remotely operates the device main body 11, for example, by performing wireless communication with the device main body 11. The remote operation based on the remote operation unit 12 includes, for example, an operation of irradiating the radiation R toward the subject A with respect to the device main body 11.

[0050] After the user B, who is the operator of the radiation irradiation device 10, takes out the remote operation unit 12 from the device main body 11, the user B operates the remote operation unit 12 in a state of being at a predetermined distance away from the device main body 11. Thereby, the radiation R is irradiated from the X-ray tube 15 of the device main body 11 toward the subject A. The radiation R that has passed through the subject A is detected by the detector 16. The detector 16 is, for example, a so-called flat panel detector, has a detection surface with two-dimensional pixel arrangement, and outputs an image signal corresponding to the intensity of the radiation R incident on each pixel. The radiation R carries information on the internal tissues of the subject A by passing through the subject A. The detector 16 outputs an image signal representing a projection image of the internal tissues of the subject A as a radiation image by detecting such radiation R in each pixel of the detection surface. The detector 16 is an example of the "radiation detector" related to the technology of the present invention.

[0051] After the user B finishes the imaging using the radiation irradiation device 10, the remote operation unit 12 is housed in the device main body 11. In the state where the remote operation unit 12 is housed in the device main body 11, the radiation irradiation device 10 is carried by the user B or stored in a storage case of the radiation irradiation device 10.

[0052] Figure 3 and Figure 4 FIG. shows an external perspective view showing an example of the structure of the radiation irradiation device 10. As an example, as Figure 3 shown, the device main body 11 has a substantially rectangular parallelepiped shape having a long side direction in the left-right direction. A cylindrical portion 18 protruding in the irradiation direction of the radiation R is provided on the front surface 11A of the device main body 11. A collimator and an irradiation window, which will be described later, are installed inside the cylindrical portion 18. And a skin protection member 20 is attached to the front end of the cylindrical portion 18. The skin protection member 20 is used to ensure a required interval between the device main body 11 and the subject A and suppress the irradiation of the radiation R in a state where the device main body 11 is too close to the subject A. And a grip member 11C is attached to the left side surface of the device main body 11. The user B grips the radiation irradiation device 10 via the grip member 11C.

[0053] A housing portion 24 is provided on the back surface 11B of the device main body 11. The housing portion 24 can detachably house the remote operation unit 12 on the back surface 11B of the device main body 11. Specifically, the housing portion 24 has a concave inner wall surface 34. In the state where the remote operation unit 12 is housed in the housing portion 24, the inner wall surface 34 faces all surfaces of the remote operation unit 12 except the back surface 12B. Thus, the housing portion 24 detachably houses the remote operation unit 12.

[0054] And a display 22 is provided on the back surface 11B of the device main body 11. Various information related to the radiation imaging is displayed on the display 22. The display 22 can be, for example, a liquid crystal display or an EL (Electro-Luminescence) display. The display 22 is an example of the "display" related to the technology of the present invention.

[0055] When the remote operation unit 12 is housed in the device main body 11, it has a substantially rectangular parallelepiped shape having a long side direction in the up-down direction. The remote operation unit 12 has an operation surface 12A and a back surface 12B. An irradiation button 13A and a imaging button 13B are provided on the operation surface 12A. The irradiation button 13A is an operation button for instructing the irradiation of the radiation R. By the user B pressing the irradiation button 13A, a signal for irradiating the radiation R is output from the remote operation unit 12 to the device main body 11.

[0056] And an optical camera 47 is built in the radiation irradiation device 10 (referenceFigure 5 )。The photographing button 13B is an operation button for instructing photographing by the optical camera 47. By pressing the photographing button 13B by the user B, a signal for causing the optical camera 47 described later to perform photographing is output from the remote operation unit 12 to the apparatus main body 11. The back surface 12B is the surface on the opposite side of the operation surface 12A, and operation keys including the irradiation button 13A and the photographing button 13B are not provided on the back surface 12B.

[0057] In addition, here, the irradiation button 13A and the photographing button 13B have been described as examples of buttons, but this is merely an example. The irradiation button 13A and the photographing button 13B can be a touch panel in addition to a cursor and a slide switch or the like.

[0058] As an example, as Figure 4 shown, the cylindrical portion 18 protruding from the front surface 11A of the apparatus main body 11 has a collimator 26 and an irradiation window 28. The collimator 26 is a collimator that limits the irradiation range of the radiation R within a predetermined range, and is also referred to as a collimator. And, the irradiation window 28 is composed of a member transparent to the radiation R and is a window member that divides the outside and the inside of the cylindrical portion 18. The radiation R emitted from the radiation tube 15 is irradiated onto the subject A through the irradiation window after the irradiation range is defined by the collimator 26.

[0059] And, an optical camera 47 is provided inside the cylindrical portion 18 (refer to Figure 5 ). The optical camera 47 photographs the subject A, and the optical image of the photographed subject A is used for aligning the irradiation position of the radiation R (detailed content will be described later). The optical camera 47 can perform still image photography and moving image photography. The photographing direction of the optical photography based on the optical camera 47 and the photographing direction of the radiation photography by irradiating the radiation R from the radiation tube 15 are substantially the same. Here, the substantially same direction includes a deviation to such an extent that the optical image can be aligned with the radiation image by performing image correction (geometric transformation) such as affine transformation and projective transformation on the optical image.

[0060] The optical camera 47 is, for example, an imaging device having an image sensor such as a CCD (Charge Coupled Device) image sensor and a CMOS (Complementary Metal Oxide Semiconductor) image sensor. The symbol 30 is a photographing window that is a part of the lens of the optical camera 47. The image light of the subject A enters the image sensor inside the optical camera 47 through the photographing window 30. The optical camera 47 is an example of the "photographing device" related to the technology of the present invention.

[0061] Figure 5The block diagram which shows an example of the hardware structure of the radiation irradiation apparatus 10 is shown. As an example, as Figure 5 shown, the apparatus main body 11 includes a control device 36. The control device 36 controls the operation of the entire apparatus main body 11. The control device 36 includes a processor 38, a storage device 40, a RAM (Random Access Memory) 42, and an external I / F (interface) 44. The processor 38, the storage device 40, the RAM 42, and the external I / F 44 are connected via buses such as a system bus and a control bus 46 so that various information can be transmitted and received to and from each other. The control device 36 is an example of the "information processing device" related to the technology of the present invention.

[0062] The processor 38 has, for example, a CPU (Central Processing Unit). In addition, a GPU (Graphics Processing Unit) dedicated to image processing may be provided separately from the CPU on the processor 38. The processor 38 is an example of the "processor" related to the technology of the present invention.

[0063] The storage device 40 is a non-volatile storage device that stores various programs and various parameters, etc. As the storage device 40, for example, a flash memory (for example, EEPROM (electrically erasable and programmable readonly memory) and SSD (Solid State Drive), etc.) and / or HDD (Hard Disk Drive) can be cited. In addition, the flash memory and the HDD are merely examples. For example, at least one of a flash memory, an HDD, a magnetoresistive memory, and a ferroelectric random access memory can be used as the storage device 40.

[0064] A control program 40A in the control device 36 is stored in the storage device 40. The control program 40A is an example of the "information processing program" related to the technology of the present invention. The storage device 40 is an example of the "storage unit" related to the technology of the present invention.

[0065] The RAM 42 is a memory that temporarily stores information and is used as a working memory by the processor 38. As the RAM 42, for example, DRAM (Dynamic Random Access Memory) and / or SRAM (Static Random Access Memory) can be cited.

[0066] The processor 38 reads out the control program 40A from the storage device 40 and executes the read control program 40A on the RAM 42.

[0067] The external I / F 44 controls the transmission and reception of various information between the devices existing outside the control device 36. The external I / F 44 is communicably connected to the X-ray tube 15, the display 22, the optical camera 47, and the wireless communication unit 48.

[0068] The device main body 11 is provided with the wireless communication unit 48. The wireless communication unit 48 performs wireless communication of information including the operation instruction 49 with the remote operation unit 12. The wireless communication method is, for example, a communication method compliant with the Bluetooth (registered trademark) standard. The operation instruction 49 refers to the instruction for remotely operating the device main body 11. The operation instruction 49 includes the irradiation start instruction 49A for causing the device main body 11 to start the irradiation of radiation. As another example, the operation instruction 49 includes an instruction for starting the shooting based on the optical camera 47 and / or an instruction for turning off the power of the device main body 11. The wireless communication unit 48 is a hardware for performing wireless communication with the remote operation unit 12 and is a wireless communication I / F (interface). The wireless communication I / F of the wireless communication unit 48 is configured to include, for example, a communication antenna and a transceiver circuit.

[0069] In addition, here, Bluetooth (registered trademark) is exemplified as the wireless communication method between the wireless communication unit 48 and the remote operation unit 12, but the technology of the present invention is not limited thereto. As the first method, Zigbee (registered trademark) or infrared communication can be used.

[0070] Hereinafter, an example of the functional structure of the control device 36 will be described. As Figure 5 shown, the control device 36 includes an acquisition unit 38A, a determination unit 38B, and a control unit 38C. By executing the control program 40A by the processor 38, the processor 38 functions as each functional unit of the acquisition unit 38A, the determination unit 38B, and the control unit 38C.

[0071] As Figure 6As shown, the control device 36 according to this embodiment causes the screens D1 to D3 different for each stage of radiography to be displayed on the display 22. Specifically, for example, during the period T1 from the start of preparation for radiography such as positioning until the radiation R is irradiated, the control device 36 displays the auxiliary positioning screen D1 on the display 22. Further, during the period T2 from when the radiation R is irradiated until the radiation image is acquired by the detector 16, the control device 36 displays the screen D2 for improving the user experience on the display 22. Further, during the period T3 after the detector 16 acquires the radiation image, the control device 36 displays the screen D3 including the radiation image on the display 22. Hereinafter, the functions of the acquisition unit 38A, the determination unit 38B, and the control unit 38C will be described for each of the periods T1 to T3.

[0072] <Period T1, Screen D1>

[0073] First, with reference to Figures 7 - 10 , the functions of the acquisition unit 38A, the determination unit 38B, and the control unit 38C during the period T1 from the start of preparation for radiography such as positioning until the radiation R is irradiated will be described. During the period T1, the control device 36 displays the auxiliary positioning screen D1 on the display 22. Figures 7 - 10 In

[0074] The acquisition unit 38A acquires the optical image 80 obtained by optically photographing the subject A with the optical camera 47. The determination unit 38B determines the position of the region of interest of the subject A based on the optical image 80 acquired by the acquisition unit 38A. The region of interest refers to the region corresponding to the imaging site. For example, in the case of photographing the lung field, the chest becomes the region of interest, in the case of photographing the stomach, the abdomen becomes the region of interest, and in the case of photographing the knee joint, the leg becomes the region of interest.

[0075] Specifically, the acquisition unit 38A can acquire a photographing command preset for the type of the region of interest of the photographing object from the console 4 and / or the RIS 6. In this case, the determination unit 38B determines the position of the region of interest set in the photographing command acquired by the acquisition unit 38A based on the optical image 80.

[0076] Also, for example, the acquisition unit 38A can receive an input regarding the type of the region of interest of the photographic subject. For example, an operation unit through which user B can input the type of the region of interest may be preset on the remote operation unit 12 and / or the apparatus main body 11, and an input regarding the type of the region of interest of the photographed subject is received through this operation unit. Also, for example, an input regarding the type of the region of interest of the photographic subject can be received in the control console 4, and the acquisition unit 38A acquires information on the type of the region of interest received by the control console 4. In this case, the determination unit 38B determines the position of the received region of interest based on the optical image 80.

[0077] In addition, regarding the method for determining the region of interest by the determination unit 38B, a known method can be appropriately applied. For example, the determination unit 38B can determine a plurality of joint points of the subject A such as the ear, shoulder, elbow, wrist, waist, and knee based on the optical image 80, and determine the position of the region of interest in the optical image 80 based on the relative positional relationship of the determined plurality of joint points. As a method for specifying the joint points, a known pose estimation technique or the like can be appropriately applied.

[0078] As Figure 7 shown, the control unit 38C performs control to overlap the first marker 91 and the second marker 92 on the optical image 80 and display them on the display 22. The first marker 91 indicates the central position of the irradiation field of the radiation R. The second marker 92 indicates a position preset for the region of interest determined by the determination unit 38B. The position preset for the region of interest refers to a position that is set in a guideline or the like to be expected to be aligned with the center of the irradiation field and is a position preset according to the type of the region of interest. For example, when the region of interest is the chest, it becomes the sixth thoracic vertebra (the center of the chest), and when the region of interest is the entire lower limb, it becomes the intermediate position between the left and right knee joints. The position preset for the region of interest is stored in the storage device 40, for example, for each type of the region of interest.

[0079] For example, in Figure 7 the screen D1A, a state where the positions of the first marker 91 and the second marker 92 deviate is shown. If radiography is performed in this state, an appropriate radiographic image cannot be obtained. In this case, user B moves the apparatus main body 11 of the radiation irradiation apparatus 10 while confirming the display 22 so that the first marker 91 and the second marker 92 overlap (refer to Figure 8 ). The control unit 38C updates the screen displayed on the display 22 to follow the movement of the apparatus main body 11. That is, the acquisition unit 38A acquires the optical image 80 at a preset time interval (frame rate), and the specifying unit 38B re-determines the position of the region of interest each time the optical image 80 is acquired.

[0080] Also, as Figure 7As shown, the control unit 38C can perform control to display the third marker 93 indicating the detection area of the radiation R in the detector 16 by overlapping it with the optical image 80 on the display 22. Specifically, the control unit 38C can acquire distance information indicating the distance (so-called SID (Source to Image receptor Distance)) between the radiation source (the x-ray tube 15) of the radiation R and the detector 16, and derive the size of the detection area based on the distance information. Further, the control unit 38C can perform control to display the third marker 93 corresponding to the size of the derived detection area by overlapping it on the optical image 80 on the display 22.

[0081] For example, the size of the detection area may be stored in advance in a storage device 40 or the like according to the type of the detector 16 that can be used in combination with the radiation irradiation device 10. The control unit 38C can adjust the size of the third marker 93 displayed on the display 22 through geometric calculation of the size of the detection area stored in the storage device 40 or the like and the distance information. Figure 7 The third marker 93 shown represents the sizes of the detection areas of two types of detectors 16 that can be used in combination with the radiation irradiation device 10. Through the third marker 93, the user B can determine whether the imaging part appropriately falls within the detection area.

[0082] In addition, as the distance information, for example, on the premise that the radiation irradiation device 10 is used in a state where a predetermined appropriate SID is ensured, the value of SID stored in advance in a storage device 40 or the like may be used. Further, for example, the measured value of SID measured by a distance measurement sensor such as LIDAR (Laser Imaging Detection and Ranging) or Light Detection and Ranging, a TOF (Time Of Flight) camera, and a stereo camera may be used.

[0083] In addition, as Figure 8 shown, Figure 7 and Figure 8 shown, the third marker 93 is consistent with the position of the detection area in the actual detector 16 in a state where the first marker 91 and the second marker 92 are appropriately positioned in an overlapping manner. That is, as Figure 7 shown, in a state where the positions of the first marker 91 and the second marker 92 are offset and not appropriately positioned, the position of the detection area represented by the third marker 93 is inconsistent with the position of the detection area in the actual detector 16.

[0084] On the other hand, as Figure 9As shown, the control unit 38C can perform the following control: determine the position of the detector 16 in the optical image 80, and overlap the third marker 93P corresponding to the determined position of the detector 16 on the optical image 80 and display it on the display 22. Figure 9 The position and size of the third marker 93P shown are consistent with the actual detection area.

[0085] As a method for determining the position of the detector 16 in the optical image 80, for example, a method using image recognition can be applied. Specifically, a marker indicating the detection area of the radiation R can be given to the detector 16. In this case, the optical image 80 acquired by the acquisition unit 38A may sometimes include the subject A and the detector 16 to which the marker indicating the detection area of the radiation R is given. The control unit 38C can determine the position of the detector 16 in the optical image 80 based on the marker indicating the detection area included in the optical image 80.

[0086] On the other hand, sometimes the marker provided on the detector 16 cannot be detected by image recognition because the subject A or the like overlaps with the detector 16. Therefore, for example, a positioning sensor can be provided on the detector 16, and the control unit 38C uses the positioning sensor provided on the detector 16 to determine the position of the detector 16 in the optical image 80. As the positioning sensor, for example, a known sensor using Bluetooth (registered trademark) and a gyro sensor or the like can be applied.

[0087] And, as Figure 10 shown, the control unit 38C can perform control to simultaneously display the third marker 93 (refer to Figure 7 and Figure 8 ) corresponding to the size of the detection area and the third marker 93P (refer to Figure 9 ) whose position and size are consistent with the actual detection area on the display 22. In this case, positioning can also be assisted by the third marker 93 and the third marker 93P.

[0088] In addition, Figures 7 - 10 The forms of the first marker 91, the second marker 92, and the third markers 93, 93P shown are an example and are not limited thereto. For example, as the first marker 91 and the second marker 92, markers of various forms shown in the table of Figure 11 can be used.

[0089] And, as Figures 7 - 10 shown, when the control unit 38C acquires a photographing command through the acquisition unit 38A, it can perform control to display various information 98 (photographing conditions, photographing parts, etc.) included in the photographing command on the display 22.

[0090] User B performs positioning while confirming the first marker 91, second marker 92, third marker 93, etc. displayed on the display 22. If the positioning is completed, irradiation of the radiation R is indicated. If irradiation of the radiation R is indicated by User B, the control device 36 transfers to the period T2.

[0091] <Period T2, Screen D2>

[0092] Next, with reference to Figure 12 , the functions of the acquisition unit 38A and the control unit 38C during the period T2 from the irradiation of the radiation R until the radiation image is acquired by the detector 16 are described. During the period T2, the control device 36 displays the screen D2 for improving the user experience on the display 22. Specifically, in order for the detector 16 to output an image signal corresponding to the intensity of the radiation R as a radiation image, a waiting time of about several seconds to more than ten seconds is usually generated. By displaying an optical image on the display 22 during this waiting time, the user's sense of frustration is reduced and the user experience is improved. Figure 12 is an example of the screen D2 displayed on the display 22 by the control unit 38C.

[0093] The acquisition unit 38A acquires a representative optical image 80C obtained by optically photographing the subject A with the optical camera 47 within a predetermined period including the point in time when the subject A is irradiated with the radiation R. The predetermined period including the point in time when the radiation R is irradiated, for example, means several seconds before and after the point in time when the radiation R is irradiated. Preferably, the point in time when the subject A is irradiated with the radiation R and the point in time when the subject A is optically photographed are substantially the same period.

[0094] The control unit 38C performs the following control: during the period T2 from the irradiation of the subject A with the radiation R until the radiation image is acquired by the detector 16, the representative optical image 80C is displayed on the display 22. More specifically, the control unit 38C performs the following control: during the first period from after the acquisition of the representative optical image 80C by the acquisition unit 38A until the radiation image is acquired by the detector 16, the representative optical image 80C is displayed on the display 22. That is, the "first period" related to the technology of the present invention corresponds to the period T2 from the irradiation of the subject A with the radiation R until the radiation image is acquired by the detector 16.

[0095] In this case, preferably, the control unit 38C performs the following control: during the first period, the region in the representative optical image 80C corresponding to the region included in the radiation image is displayed on the display 22. That is, preferably, the control unit 38C performs the following control: after cropping the representative optical image 80C captured by the optical camera 47 according to the imaging range of the radiation image, it is displayed on the display 22. By doing so, the user can grasp in advance what kind of radiation image can be obtained, which can help improve the user experience.

[0096] Also, as Figure 12 shown, the control unit 38C can perform control to display the information 96 indicating the waiting time (loading) before obtaining the radiation image at the current time point on the display 22. In addition, the information 96 indicating the waiting time is not limited to the character-based manner as Figure 12 shown, and can also be represented by symbols, graphics, etc.

[0097] In addition, generally, the irradiation period from the start time point to the end time point of the irradiation of the radiation R on the subject A is from several tens of milliseconds to several hundreds of milliseconds. However, due to reasons such as the movement of the subject A during this irradiation period, it is sometimes impossible to obtain an appropriate radiation image. Therefore, the control device 36 can use the representative optical image 80C for studying the causes of shooting failure by making the shutter speed during the shooting of the representative optical image 80C consistent with the irradiation time of the radiation R.

[0098] Specifically, the control unit 38C can obtain information indicating the irradiation period from the start time point to the end time point of the irradiation of the radiation R on the subject A from a shooting command or the like before shooting the representative optical image 80C (that is, during the period T1). And the control unit 38C can instruct the imaging device (optical camera 47) of the representative optical image 80C to optically image the subject A at a shutter speed corresponding to the irradiation period. And the acquisition unit 38A can obtain the representative optical image 80C obtained by optically imaging the subject A at a shutter speed corresponding to the irradiation period from the optical camera 47.

[0099] When the control device 36 obtains the radiation image from the detector 16, it transfers to the period T3.

[0100] <Period T3, Screen D3>

[0101] Next, with reference to Figure 13 , the functions of the acquisition unit 38A and the control unit 38C during the period T3 after obtaining the radiation image from the detector 16 are described. During the period T3, the control device 36 displays the screen D3 including the radiation image on the display 22. Figure 13 is an example of the screen D3 displayed on the display 22 by the control unit 38C and includes the radiation image 82.

[0102] The acquisition unit 38A acquires a radiation image from the detector 16. The control unit 38C performs control as follows: in the second period after the radiation image is acquired by the acquisition unit 38A, the radiation image is displayed on the display 22. The "second period" related to the technology of the present invention corresponds to the period T3 after the radiation image is acquired from the detector 16.

[0103] Moreover, the optical image 80 acquired during the period T1 and the representative optical image 80C acquired during the period T2 are stored in the storage device 40. From the viewpoints of privacy protection and the like, it is sometimes preferable to delete such an optical image 80 and the representative optical image 80C from the storage device 40 of the radiation irradiation apparatus 10.

[0104] Therefore, the control unit 38C can delete the optical image 80 and / or the representative optical image 80C stored in the storage device 40 after acquiring the radiation image from the detector 16. Further, the control unit 38C can perform control to display a screen for allowing the user to select whether to delete the optical image 80 and / or the representative optical image 80C from the storage device 40 on the display 22. In this case, the optical image 80 and / or the representative optical image 80C can be deleted from the storage device 40 only when instructed to be deleted by the user.

[0105] Next, with reference to Figure 14 , the operation of the control device 36 according to the present embodiment will be described. In the control device 36, the control process shown in Figure 14 is executed by the processor 38 executing the control program 40A. The control process is executed, for example, when an instruction to start execution is issued by the user B.

[0106] In step S10, the acquisition unit 38A acquires the optical image 80 obtained by optically photographing the subject A with the optical camera 47. In step S12, the determination unit 38B determines the position of the region of interest of the subject A based on the optical image 80 acquired in step S10. In step S14, the control unit 38C performs control as follows: the first marker 91 indicating the central position of the irradiation field of the radiation R and the second marker 92 indicating a position preset for the region of interest determined in step S12 are superimposed on the optical image 80 and displayed on the display 22.

[0107] The acquisition unit 38A, the determination unit 38B, and the control unit 38C repeat the processes of steps S10 to S14 until the user B completes the positioning and instructs to irradiate the radiation R (step S16 is "No"). On the other hand, if the user B completes the positioning and instructs to irradiate the radiation R, the acquisition unit 38A, the determination unit 38B, and the control unit 38C proceed to step S18 (step S16 is "Yes").

[0108] In step S18, the acquisition unit 38A acquires a representative optical image 80C obtained by optically photographing the subject A with the optical camera 47 within a predetermined period including the time point when the radiation R is irradiated to the subject A. In step S20, the control unit 38C performs control to display the representative optical image 80C acquired in step S18 on the display 22. More specifically, the control unit 38C performs the following control: during the period until the acquisition unit 38A acquires the radiation image from the detector 16, the representative optical image 80C is continuously displayed on the display 22 (step S22 is "No").

[0109] On the other hand, in step S22, if the acquisition unit 38A acquires the radiation image from the detector 16, the process proceeds to step S24. In step S24, the control unit 38C performs control to display the radiation image acquired in step S22 on the display 22, and ends this control process.

[0110] As described above, the control device 36 according to one embodiment of the present invention includes at least one processor, and the processor performs the following processes: acquiring an optical image obtained by optically photographing a subject; determining the position of a region of interest based on the optical image; and performing control to overlap a first marker indicating the central position of the irradiation field of the radiation when performing radiation imaging of the subject from a direction substantially the same as the imaging direction of the optical imaging and a second marker indicating a predetermined position for the determined region of interest on the optical image and display the overlapped image on the display. That is, according to the control device 36 according to the present embodiment, by using the first marker and the second marker, it is possible to assist in positioning during radiation imaging so as to perform imaging in a predetermined positioning manner such as a guideline.

[0111] In addition, the control device 36 according to one embodiment of the present invention further performs the following processes: the processor performs the following processes: acquiring a representative optical image obtained by optically photographing a subject within a predetermined period including the time point when the radiation is irradiated to the subject; acquiring a radiation image from a radiation detector that detects the radiation transmitted through the subject and generates a radiation image of the subject; performing control to display the representative optical image on the display during a first period from the acquisition of the representative optical image until the acquisition of the radiation image; and performing control to display the radiation image on the display during a second period after the acquisition of the radiation image. That is, by displaying the representative optical image on the display during the waiting time until the radiation detector outputs the radiation image, it is possible to reduce the user's frustration and improve the user experience.

[0112] In addition, in the above-described embodiments, the control device 36 included in the radiation irradiation device 10 is described as an example of the information processing device of the present invention, but it is not limited thereto. For example, an external device such as the control console 4 can function as the information processing device of the present invention having the functions of the above-described acquisition unit 38A, determination unit 38B, and control unit 38C.

[0113] Moreover, in the above-described embodiments, an example in which the remote operation unit 12 performs wireless communication with the device main body 11 is described, but the technology of the present invention is not limited thereto. The remote operation unit 12 and the device main body 11 may perform wired communication.

[0114] Furthermore, in each of the above-described embodiments, for example, as the hardware structure of the processing unit (processing unit) that executes various processes such as the acquisition unit 38A, determination unit 38B, and control unit 38C, various processors (processor) shown below can be used. In addition to the CPU, which is a general-purpose processor that executes software (program) and functions as various processing units as described above, the above-mentioned various processors also include processors that can change the circuit structure after manufacturing, such as FPGA (Field Programmable Gate Array), that is, programmable logic devices (Programmable Logic Device: PLD), and processors with a circuit structure specifically designed to execute specific processes, such as ASIC (Application Specific Integrated Circuit), that is, dedicated circuits.

[0115] One processing unit may be constituted by one of these various processors, or may be constituted by a combination of two or more processors of the same type or different types (for example, a combination of multiple FPGAs or a combination of a CPU and an FPGA). Also, multiple processing units may be constituted by one processor.

[0116] As an example of constituting multiple processing units by one processor, first, there is the following method: as represented by computers such as clients and servers, a combination of one or more CPUs and software constitutes one processor, and this processor functions as multiple processing units. Second, there is a method having a processor that uses an IC (Integrated Circuit) chip to implement the functions of the entire system including multiple processing units, as represented by a system on chip (SoC). In this way, various processing units are constituted by using one or more of the above-mentioned various processors as the hardware structure.

[0117] Moreover, more specifically, as the hardware structure of these various processors, circuitry formed by combining circuit elements such as semiconductor elements can be used.

[0118] Also, in the above-described embodiment, the manner in which the control program 40A in the control device 36 is pre-stored in the storage device 40 has been described, but it is not limited thereto. The control program 40A may also be provided in a manner recorded on a recording medium such as a CD-ROM (Compact Disc Read only Memory), a DVD-ROM (Digital Versatile Disc Read Only Memory), or a USB (Universal Serial Bus) memory. Further, the control program 40A may also be in a manner downloaded from an external device via a network. In addition, the technology of the present disclosure relates not only to programs but also to non-transitory storage media storing the programs.

[0119] The technology of the present invention can also be appropriately combined with the above-described embodiment examples and embodiments. The description content and the illustrated content shown above are detailed descriptions of parts related to the technology of the present invention, and are merely examples of the technology of the present invention. For example, the description of the above structure, function, operation, and effect is an example of the structure, function, operation, and effect of the parts related to the technology of the present invention. Therefore, within the scope not departing from the gist of the technology of the present invention, it is of course possible to delete unnecessary parts or add or replace new elements to the description content and the illustrated content shown above.

[0120] Regarding the above-described embodiment, the following supplementary notes are further disclosed.

[0121] <Supplementary Note 1>

[0122] An information processing apparatus including at least one processor,

[0123] The above processor performs the following processing:

[0124] Obtaining an optical image obtained by optically photographing a subject;

[0125] Determining the position of a region of interest based on the above optical image; and

[0126] Performing control to overlap a first marker indicating the central position of the radiation irradiation field when radiographing the subject from a direction substantially the same as the photographing direction of the above optical photographing and a second marker indicating a position preset for the determined above region of interest on the optical image and display the result on a display.

[0127] <Supplementary Note 2>

[0128] The information processing apparatus according to Note 1, wherein

[0129] The above-mentioned processor performs the following processing: obtaining a photographing command that is predefined for the type of the region of interest of the photographed object; and

[0130] Performing control to superimpose the second marker indicating a position predefined according to the type of the region of interest specified in the above-mentioned photographing command on the above-mentioned optical image and display it on the above-mentioned display.

[0131] <Note 3>

[0132] The information processing apparatus according to Note 1 or 2, wherein the above-mentioned processor performs the following processing:

[0133] Receiving an input of the type of the region of interest of the photographed object; and

[0134] Performing control to superimpose the second marker indicating a position predefined according to the type of the region of interest input above on the above-mentioned optical image and display it on the above-mentioned display.

[0135] <Appendix 4>

[0136] The information processing apparatus according to any one of Notes 1 to 3, wherein the above-mentioned processor performs the following control: superimposing a third marker indicating a detection region of the above-mentioned radiation on the above-mentioned optical image of the radiation detector that detects the above-mentioned radiation transmitted through the above-mentioned subject and generating the radiation image of the above-mentioned subject, and displaying it on the above-mentioned display.

[0137] <Appendix 5>

[0138] The information processing apparatus according to Note 4, wherein the above-mentioned processor performs the following processing:

[0139] Obtaining distance information indicating the distance between the radiation source of the above-mentioned radiation and the above-mentioned radiation detector;

[0140] Deriving the size of the above-mentioned detection region based on the above-mentioned distance information; and

[0141] Performing control to superimpose the above-mentioned third marker corresponding to the size of the above-mentioned detection region derived on the above-mentioned optical image and display it on the above-mentioned display.

[0142] <Appendix 6>

[0143] The information processing apparatus according to Note 4 or 5, wherein the above-mentioned processor performs the following processing:

[0144] Determining the position of the above-mentioned radiation detector in the above-mentioned optical image; and

[0145] Perform control to overlap the third marker corresponding to the position of the radiation detector determined above on the optical image and display it on the display.

[0146] <Supplementary Note 7>

[0147] The information processing apparatus according to Supplementary Note 6, wherein the processor performs the following processing:

[0148] Obtain the optical image obtained by optically photographing a radiation detector to which a marker indicating a detection area of the radiation is given together with the subject; and

[0149] Determine the position of the radiation detector in the optical image based on the marker included in the optical image.

[0150] <Appendix 8>

[0151] The information processing apparatus according to Appendix 6 or Appendix 7, wherein the processor uses a positioning sensor provided in the radiation detector to determine the position of the radiation detector in the optical image.

[0152] <Supplementary Note 9>

[0153] The information processing apparatus according to any one of Supplementary Notes 1 to 8, wherein the processor performs the following processing:

[0154] Obtain a representative optical image obtained by optically photographing the subject within a predetermined period including the time point when the subject is irradiated with the radiation;

[0155] Obtain the radiation image from a radiation detector that detects the radiation transmitted through the subject and generates the radiation image of the subject;

[0156] Perform control to display the representative optical image on the display during a first period from obtaining the representative optical image to obtaining the radiation image; and

[0157] Perform control to display the radiation image on the display during a second period after obtaining the radiation image.

[0158] <Supplementary Note 10>

[0159] The information processing apparatus according to Supplementary Note 9, wherein the processor performs the following control:

[0160] During the first period, perform control to display on the display a region in the representative optical image corresponding to the region included in the radiation image.

[0161] <Supplementary Note 11>

[0162] The information processing apparatus according to Supplementary Note 9 or 10, wherein the processor performs the following processing:

[0163] Obtain information indicating the irradiation period from the start time point to the end time point of the irradiation of the radiation on the subject;

[0164] , instruct the imaging device representing the optical image to optically image the subject at a shutter speed corresponding to the irradiation period; and

[0165] Obtain the representative optical image obtained by optically imaging the subject at a shutter speed corresponding to the irradiation period from the imaging device.

[0166] <Supplementary Note 12>

[0167] The information processing apparatus according to any one of Supplementary Notes 1 to 11, wherein the processor performs the following processing:

[0168] Store the obtained optical image in a storage unit, and

[0169] After obtaining the radiation image from a radiation detector that detects the radiation transmitted through the subject and generates the radiation image of the subject, delete the optical image stored in the storage unit.

[0170] <Supplementary Note 13>

[0171] A radiation irradiation apparatus, comprising: the information processing apparatus according to any one of Supplementary Notes 1 to 12; a radiation source that irradiates the subject with radiation; and an imaging device that optically images the subject.

[0172] <Supplementary Note 14>

[0173] An information processing method, comprising the following processing:

[0174] Obtain an optical image obtained by optically imaging a subject;

[0175] Determine the position of a region of interest based on the optical image; and

[0176] Perform control to overlap a first marker indicating the center position of the radiation irradiation field when radiographically imaging the subject from a direction substantially the same as the imaging direction of the optical imaging and a second marker indicating a position preset for the determined region of interest on the optical image and display the result on a display.

[0177] <Supplementary Note 15>

[0178] An information processing program for causing a computer to execute the following processing:

[0179] Obtain an optical image obtained by optically photographing a subject;

[0180] Determine the position of a region of interest based on the optical image; and

[0181] Perform control to overlap a first marker indicating the center position of the radiation irradiation field when radiographing the subject from a direction substantially the same as the photographing direction of the optical photographing and a second marker indicating a position preset for the determined region of interest on the optical image and display the overlapped image on a display.

[0182] The invention of Japanese Patent Application No. 2022-210691, filed on December 27, 2022, is incorporated herein by reference in its entirety. All documents, patent applications, and technical standards described in this specification are incorporated herein by reference to the same extent as if each individual document, patent application, and technical standard were specifically and separately indicated to be incorporated by reference.

Claims

1. An information processing apparatus having at least one processor, wherein the processor performs the following processing: acquire an optical image obtained by optically photographing a subject; determine the position of a region of interest based on the optical image; and perform control to overlap a first marker indicating the central position of the radiation irradiation field when radiographing the subject from a direction substantially the same as the photographing direction of the optical photographing and a second marker indicating a position preset for the determined region of interest on the optical image and display the same on a display.

2. The information processing apparatus according to claim 1, wherein the processor performs the following processing: acquire a photographing command preset for the type of the region of interest of a photographing object; and perform control to overlap the second marker indicating a position preset for the type of the region of interest specified in the photographing command on the optical image and display the same on the display.

3. The information processing apparatus according to claim 1, wherein the processor performs the following processing: receive an input of the type of the region of interest of a photographing object; and perform control to overlap the second marker indicating a position preset for the type of the region of interest inputted on the optical image and display the same on the display.

4. The information processing apparatus according to claim 1, wherein the processor performs the following control: overlap a third marker indicating the radiation detection region in a radiation detector that generates a radiation image of the subject by detecting the radiation transmitted through the subject on the optical image and display the same on the display.

5. The information processing apparatus according to claim 4, wherein the processor performs the following processing: acquire distance information indicating the distance between the radiation source of the radiation and the radiation detector; derive the size of the detection region based on the distance information; and perform control to overlap the third marker corresponding to the derived size of the detection region on the optical image and display the same on the display.

6. The information processing apparatus according to claim 4, wherein the processor performs the following processing: determine the position of the radiation detector in the optical image; and perform control to overlap the third marker corresponding to the determined position of the radiation detector on the optical image and display the same on the display.

7. The information processing apparatus according to claim 6, wherein the processor performs the following processing: acquire the optical image obtained by optically photographing the radiation detector provided with a marker indicating the radiation detection region together with the subject; and determine the position of the radiation detector in the optical image based on the marker included in the optical image.

8. The information processing apparatus according to claim 6, wherein the processor performs the following processing: use a positioning sensor provided in the radiation detector to determine the position of the radiation detector in the optical image.

9. The information processing apparatus according to claim 1, wherein The processor performs the following processing: Obtain a representative optical image obtained by optically photographing the subject within a predetermined period including the time point when the subject is irradiated with the radiation; Obtain the radiation image from a radiation detector that detects the radiation transmitted through the subject and generates the radiation image of the subject; Perform control to display the representative optical image on the display during a first period from after obtaining the representative optical image until obtaining the radiation image; And Perform control to display the radiation image on the display during a second period after obtaining the radiation image.

10. The information processing apparatus according to claim 9, wherein The processor performs the following control: During the first period, cause a region corresponding to the region included in the radiation image in the representative optical image to be displayed on the display.

11. The information processing apparatus according to claim 9, wherein The processor performs the following processing: Obtain information indicating the irradiation period from the start time point to the end time point of the irradiation of the radiation to the subject; Instruct the photographing apparatus of the representative optical image to optically photograph the subject at a shutter speed corresponding to the irradiation period; And Obtain the representative optical image obtained by optically photographing the subject at a shutter speed corresponding to the irradiation period from the photographing apparatus.

12. The information processing apparatus according to claim 1, wherein The processor performs the following processing: Store the obtained optical image in a storage unit; and After obtaining the radiation image from a radiation detector that detects the radiation transmitted through the subject and generates the radiation image of the subject, delete the optical image stored in the storage unit.

13. A radiation irradiation apparatus, which is a mobile radiation irradiation apparatus, the radiation irradiation apparatus comprising: The information processing apparatus according to any one of claims 1 to 12; A radiation source that irradiates the subject with radiation; and A photographing apparatus that optically photographs the subject.

14. An information processing method, which includes the following processing: Obtain an optical image obtained by optically photographing a subject; Determine the position of the region of interest based on the optical image; and Perform control to overlap a first marker indicating the central position of the irradiation field of the radiation when radiographically photographing the subject from a direction substantially the same as the photographing direction of the optical photographing and a second marker indicating a predetermined position for the determined region of interest on the optical image and display it on the display.

15. An information processing program, which is used to cause a computer to execute the following processing: Obtain an optical image obtained by optically photographing a subject; Determine the position of the region of interest based on the optical image; and Control for overlapping a first mark indicating the center position of the radiation irradiation field when performing radiography on the subject from a direction substantially the same as the photographing direction of the optical photographing and a second mark indicating a position preset for the determined region of interest on the optical image and displaying the overlapped marks on a display.

Images