Radiographic apparatus, radiographic method, and computer program product

Abstract

The present invention relates to a radiographic apparatus, a radiographic method, and a computer program product, which automatically optimize the relative positioning of a bulb tube and a subject. A radiographic imaging device (1) is provided with: an optical camera (optical camera (18)) that captures an optical image; a first changing means (first changing unit (19)) for changing the relative position between the bulb tube and the subject; and a determination unit (control unit (11)) that determines whether or not the relative arrangement of the bulb tube and the subject is good on the basis of the plurality of optical images. The radiographic imaging device (1) performs relative positioning of the bulb tube and the subject on the basis of the determination result of the determination unit.

Description

TECHNICAL FIELD

[0001] The present application relates to a radiographic apparatus, a radiographic method, and a computer program product. BACKGROUND

[0002] Conventionally, a user such as a photographer manually positions a tube and an object to be radiographed, and performs radiography. Recently, a radiographic apparatus that automatically positions a tube with respect to an object to be radiographed has been developed.

[0003] In Patent Literature 1, it is described that an optical camera integrated with a tube is used to take an image of an object to be radiographed, and a positioning determination is made as to whether the relative positional relationship between the tube and the object to be radiographed is correct.

[0004] In Patent Literature 2, it is described that an optical camera is used to take an image of an object to be radiographed once, and positional information between the tube and the object to be radiographed is acquired.

[0005] Patent Literature 1: Japanese Patent Application Publication No. 2012-24399

[0006] Patent Literature 2: Japanese Patent Application Publication No. 2023-102361

[0007] In Patent Literature 1, in a case where it is determined that the relative positional relationship between the tube and the object to be radiographed is incorrect, a photographer repositions the object to be radiographed.

[0008] However, in a case where the radiographic apparatus automatically repositions the tube, not only information as to whether the relative positional relationship is correct or incorrect needs to be acquired, but also relative positional information between the tube and the object to be radiographed as a shift amount needs to be acquired.

[0009] However, Patent Literature 2 only takes an image using an optical camera once, and thus may not be able to correctly acquire positional information between the tube and the object to be radiographed as a shift amount. SUMMARY

[0010] Therefore, an object of the present application is to further optimize the relative positioning of a tube and an object to be radiographed automatically.

[0011] To achieve the above object, a radiographic apparatus according to the present application includes:

[0012] an optical camera that takes optical images;

[0013] a first changing unit that changes the relative position of the tube and the object to be radiographed; and

[0014] a determination unit that determines, based on a plurality of the optical images, whether the relative positioning of the tube and the object to be radiographed is good,

[0015] The radiographic apparatus performs relative positioning of the tube and the subject based on a result of the determination by the determination section.

[0016] In addition, the radiographic method of the present application is a radiographic method performed by a radiographic apparatus, the radiographic apparatus comprising:

[0017] an optical camera that captures optical images; and

[0018] a first changing unit that changes the relative position of the tube and the subject,

[0019] The radiographic method comprises:

[0020] a determination step of determining whether the relative arrangement of the tube and the subject is good based on the plurality of optical images; and

[0021] a positioning step of performing relative positioning of the tube and the subject based on a result of the determination by the determination step.

[0022] In addition, the computer program product of the present application causes a computer of a radiographic apparatus to function as a determination section and a positioning section, wherein

[0023] The radiographic apparatus comprises:

[0024] an optical camera that captures optical images; and

[0025] a first changing unit that changes the relative position of the tube and the subject,

[0026] the determination section determines whether the relative arrangement of the tube and the subject is good based on the plurality of optical images,

[0027] the positioning section performs relative positioning of the tube and the subject based on a result of the determination by the determination section.

[0028] According to the present application, it is possible to automatically further optimize the relative positioning of the tube and the subject. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a schematic configuration diagram of a radiographic apparatus of the present embodiment.

[0030] Figure 2 is a schematic configuration diagram of a radiographic apparatus of the present embodiment.

[0031] Figure 3 is a schematic configuration diagram of a radiographic apparatus of the present embodiment.

[0032] Figure 4 is a schematic configuration diagram of a radiographic apparatus of the present embodiment.

[0033] Figure 5 is a block diagram showing the structure of a radiation imaging apparatus.

[0034] Figure 6 is a flowchart showing the arrangement determination process.

[0035] Figure 7 is a flowchart showing the arrangement determination process.

[0036] BRIEF DESCRIPTION OF DRAWINGS 1...radiation imaging apparatus; 5...radiation imaging apparatus; 11...control section (determination section, positioning section, decision section); 12...operation section; 13...display section; 14...communication section; 15...storage section; 16...X-ray tube; 17...FPD; 18...optical camera; 19...first changing section; 110...second changing section; 2...support column; 3...structure; 4...subject. DETAILED DESCRIPTION

[0037] Hereinafter, the embodiments of the present application will be described using the drawings. Among them, the following described embodiments are given various limitations which are technically preferable in order to implement the present application. Therefore, the technical scope of the present application is not limited to the following embodiments and illustrated examples.

[0038] <Overall structure of radiation imaging apparatus 1>

[0039] First, the brief structure of the radiation imaging apparatus 1 in the present embodiment will be described using Figure 1 and Figure 2 . Figure 1 is a brief structure diagram in the case of observing the radiation imaging apparatus 1 from the side. Figure 2 is a brief structure diagram in the case of observing the radiation imaging apparatus 1 from above.

[0040] The radiation imaging apparatus 1 is provided with a support column 2 and a structure 3 which is movably fixed to the support column 2.

[0041] The structure 3 is provided with a first moving mechanism 1001 which moves the structure 3 in the Figure 1 vertical direction shown in Figure 2 or the rotation direction around the support column 2.

[0042] The structure 3 is provided with an X-ray tube 16, a FPD (Flat Panel Detecter) 17, and an optical camera 18, and the like which will be described later.

[0043] The X-ray tube 16, the FPD 17, and the optical camera 18 are each capable of moving in the vertical, front-back, left-right, and rotation directions (tilt directions with respect to the subject 4) with respect to the subject 4.

[0044] The tube 16 is provided with a second moving mechanism 1002 that moves the tube 16 in the up-down, front-back, left-right, and rotational directions.

[0045] The FPD 17 is provided with a third moving mechanism 1003 that moves the FPD 17 in the up-down, front-back, left-right, and rotational directions. The third moving mechanism 1003 moves the FPD 17 to a position opposite the tube 16 in conjunction with movement of the tube 16.

[0046] The optical camera 18 is provided with a fourth moving mechanism 1004 that moves the optical camera 18 in the up-down, front-back, left-right, and rotational directions.

[0047] Further, in the radiographic apparatus 1 shown in Figure 1 and Figure 2 , the tube 16 and the optical camera 18 are integrated and can move as an integrated body.

[0048] In addition, the tube 16 and the optical camera 18 can also be separate bodies as in the radiographic apparatus 5 shown in Figure 3 and Figure 4 , and can move as separate bodies.

[0049] The first moving mechanism 1001, the second moving mechanism 1002, and the third moving mechanism 1003 act by control of a control section 11 described later, and the structure 3, the tube 16, and the FPD 17 are automatically moved relative to the subject 4, so that the arrangement of the tube 16 relative to the subject 4 is automatically performed.

[0050] <Each structure of the radiographic apparatus 1>

[0051] Next, each structure of the radiographic apparatus 1 in the present embodiment will be described using Figure 5 . Figure 5 is a block diagram showing the structure of the radiographic apparatus 1.

[0052] As shown in Figure 5 , the radiographic apparatus 1 is provided with a control section 11, an operation section 12, a display section 13, a communication section 14, a storage section 15, a tube 16, an FPD 17, an optical camera 18, a first change section 19, a second change section 110, and the like.

[0053] The control section 11 is constituted by a CPU (Central Processing Unit), a RAM (Random Access Memory), and the like. The CPU of the control section 11 reads out a system program, various processing programs stored in the storage section 15 and expands them in a RAM in accordance with input from the operation section 12. The CPU of the control section 11 performs various processing in accordance with the expanded programs.

[0054] The control unit 11 functions as a determination unit that determines whether the relative arrangement of the X-ray tube and the subject is good based on multiple optical images. The multiple optical images include not only multiple optical images obtained by capturing still images, but also multiple frame images obtained by capturing moving images.

[0055] Multiple optical images are optical images taken from different shooting positions and angles. Additionally, multiple optical images may also include optical images taken from different perspectives.

[0056] The determination based on multiple optical images includes: multiple determinations based on a single optical image, and multiple determinations based on multiple optical images.

[0057] The control unit 11 functions as a positioning unit that performs relative positioning of the X-ray tube and the subject based on the determination result of the determination unit.

[0058] Positioning involves: first moving the optical camera and X-ray tube, then determining the optimal placement location after the movement. Figure 6 (Arrangement judgment and processing), move the ball tube to the position determined to be well arranged ( Figure 7 (Arrangement, judgment, and processing).

[0059] Various analytical models, such as machine learning models, are used for localization processing.

[0060] In the analysis model, the input information is pre-programmed as an optical image of the subject 4 captured by the optical camera 18, and the output information is pre-programmed as the relative position information between the X-ray tube 16 and the subject 4. Specifically, the relative position information between the X-ray tube 16 and the subject 4 refers to the offset direction and / or offset amount from the correct arrangement. At least the offset direction is output.

[0061] Furthermore, the position information of the X-ray tube 16 and the optical camera 18 can be obtained from the motion information of the first moving mechanism 1001, the second moving mechanism 1002 and the fourth moving mechanism 1004 that move the X-ray tube 16 and the optical camera 18.

[0062] In addition, the optical images input into the analysis model are not limited to one; there can be multiple images.

[0063] Analysis methods include, for example, the method by which the control unit 11 estimates a person’s position and posture based on optical images (Japanese Patent Application Publication No. 2018-206321).

[0064] The operation section 12 has a touch panel or the like in which transparent electrodes are arranged in a lattice pattern so as to cover the surface of the display section 13. The operation section 12 is configured to be operable by an operator. In addition, the operation section 12 outputs various signals based on operations performed by the operator to the control section 11.

[0065] The display section 13 is constituted by a monitor such as an LCD (Liquid Crystal Display), a CRT (Cathode Ray Tube), or the like. The display section 13 performs display according to an instruction of a display signal input from the control section 11.

[0066] The communication section 14 performs transmission and reception of data with various devices including the FPD 17 through wired communication or wireless communication. The wireless communication method includes a wireless LAN (Local Area Network), Bluetooth, infrared communication, or the like. In addition, it can be a wireless communication method other than these, and can correspond to a plurality of wireless communication methods.

[0067] The various devices include, in addition to the FPD 17, an RIS (Radiology Information Systems), an electronic medical record system, a PACS (Picture Archiving and Communication System), or the like.

[0068] The storage section 15 is constituted by a nonvolatile semiconductor memory, a hard disk, or the like. The storage section 15 stores various programs executed by the control section 11, parameters required for processing by program execution, or data such as processing results.

[0069] The tube 16 (radiation source) is driven by a drive section not shown. The drive section is a circuit that performs driving of the tube 16. The drive section and the tube 16 are connected via a cable.

[0070] The tube 16 irradiates radiation to the subject 4. The radiation is, for example, X-rays or the like.

[0071] The FPD 17 is arranged at a position opposite to the tube 16 with the subject 4 interposed therebetween, generates electric charges corresponding to radiation irradiated from the tube 16 and transmitted through the subject 4, and reads out the generated electric charges as image data.

[0072] The optical camera 18 is an optical camera that photographs the subject 4, and photographs an optical image. The optical camera 18 can not only perform still image photographing, but also can perform dynamic image photographing of the optical image as a dynamic image by continuously photographing the subject 4.

[0073] The first change section 19 is constituted by the first moving mechanism 1001 and / or the second moving mechanism 1002. The first change section 19 changes the relative position of the tube 16 to the subject 4 by moving the tube 16.

[0074] The first change section 19 can acquire the position information of the tube 16 from the action information of the first moving mechanism 1001 and / or the second moving mechanism 1002.

[0075] The second change section 110 is constituted by the first moving mechanism 1001 and / or the fourth moving mechanism 1004. The second change section 110 changes the relative position of the optical camera 18 to the subject 4 by moving the optical camera 18.

[0076] The second change section 110 can acquire the position information of the optical camera 18 from the action information of the first moving mechanism 1001 and / or the fourth moving mechanism 1004.

[0077] Further, in a case where the tube 16 and the optical camera 18 are integrated, the first change section 19 functions also as the second change section 110.

[0078] <Arrangement determination processing Case 1>

[0079] Next, the arrangement determination processing in the present embodiment will be described. Figure 6

[0080] The arrangement determination processing is processing of positively determining the position of the tube 16 with respect to the subject 4 and automatically arranging the tube 16 with respect to the subject 4.

[0081] Figure 6 The arrangement determination processing illustrated in the drawing is processing in the radiographic apparatus 1 in which the tube 16 and the optical camera 18 are integrated.

[0082] The default movement amount of the tube 16 described later is input by the user using the operation section 12 and stored in the storage section 15.

[0083] First, the control section 11 controls the optical camera 18 to acquire a first optical image obtained by photographing the subject 4 from the optical camera 18 (step S1). Further, the first optical image is not limited to one, but can be plural. In a case of plural, the control section 11 controls the various moving mechanisms to change the position of the optical camera 18 to acquire plural first optical images.

[0084] Next, the control section 11 analyzes the first optical image using an analysis model (step S2). The control section 11 acquires the offset direction and / or the offset amount. The control section 11 acquires at least the offset direction.

[0085] ​The shift direction includes an up-down direction, a front-back direction, a left-right direction, a tilt (a rotation direction) with respect to the subject 4, and also includes a direction obtained by combining these directions.

[0086] Next, the control section 11 determines the moving direction of the tube 16 based on the acquired shift direction (step S3).

[0087] Next, the control section 11 determines whether the moving amount of the tube 16 can be calculated based on the acquisition state of the shift amount (step S4). In the case where the calculation is possible (step S4: Yes), the control section 11 causes the arrangement determination processing to proceed to step S5. In the case where the calculation is not possible (step S4: No), the control section 11 causes the arrangement determination processing to proceed to step S6.

[0088] Next, the control section 11 calculates the moving amount of the tube 16 based on the acquired shift amount (step S5). Further, in the case where there is an error in the moving amount acquired by the analysis and the moving amount in the actual device, the control section 11 can also reflect the error in the shift amount and calculate the moving amount.

[0089] Next, the control section 11 acquires the default moving amount of the tube 16 from the storage section 15 (step S6).

[0090] Next, the control section 11 moves the integrated tube 16 and the optical camera 18 using the first changing section 19 (step S7).

[0091] First, the control section 11 controls the optical camera 18 and acquires a second optical image obtained by photographing the subject 4 from the optical camera 18 (step S8). Further, the second optical image is not limited to one, and can be plural. In the case of plural, the control section 11 controls various moving mechanisms to change the position of the optical camera 18 and acquires plural second optical images.

[0092] Next, the control section 11 analyzes the second optical image using the analysis model (step S9). The control section 11 acquires the shift direction and / or the shift amount. The control section 11 acquires at least the shift direction.

[0093] Next, the control section 11 determines the arrangement of the tube 16 with respect to the subject 4 (step S10). In the case where the shift amount is less than the threshold value (step S10: Yes), the control section 11 determines that the arrangement is good and ends the arrangement determination processing. In the case where the shift amount is the threshold value or more or the shift amount is not acquired (step S10: No), the control section 11 determines that the arrangement is not good and causes the arrangement determination processing to proceed to step S3.

[0094] Therefore, by moving the integrated X-ray tube 16 and optical camera 18 little by little along the up-down, front-back, left-right and rotation directions, and repeatedly judging, the relative positioning of the X-ray tube 16 and the subject 4 can be automatically optimized.

[0095] Furthermore, since the tilt relative to the subject 4 cannot be calculated from a single optical image, it is possible to calculate the offset direction including the tilt and the offset amount including the tilt.

[0096] <Arrangement Judgment and Handling Situation 2>

[0097] Next, use Figure 7 The arrangement determination process in this embodiment will be explained.

[0098] Figure 7 The arrangement determination process shown is the process in the X-ray imaging device 1, where the X-ray tube 16 and the optical camera 18 are separate units.

[0099] The default movement amount of the optical camera 18, which will be described later, is input by the user using the operation unit 12 and stored in the storage unit 15.

[0100] Steps S11, S12 and Figure 6 Steps S1 and S2 are the same, so the explanation is omitted.

[0101] Steps S20 to S22 and Figure 6 Steps S8 to S10 are the same, so the explanation is omitted.

[0102] Next, based on the offset acquisition status in step S12, the control unit 11 determines whether the movement of the X-ray tube 16 can be calculated (step S13). If it can be calculated (step S13: Yes), the control unit 11 causes the arrangement determination process to proceed to step S14. If it cannot be calculated (step S13: No), the control unit 11 causes the arrangement determination process to proceed to step S17.

[0103] The following explains the situation where the movement of the X-ray tube 16 can be calculated.

[0104] First, the control unit 11 determines the moving direction of the X-ray tube 16 based on the acquired offset direction (step S14).

[0105] Next, the control unit 11 calculates the movement of the X-ray tube 16 based on the acquired offset (step S15). Furthermore, if there is an error between the movement obtained through analysis and the actual movement in the device, the control unit 11 can also reflect the error in the offset and calculate the movement.

[0106] Next, the control unit 11 uses the first change unit 19 to move the X-ray tube 16 (step S16). The control unit 11 then proceeds to the arrangement determination process in step S20.

[0107] Explanation is provided for cases where the movement of the X-ray tube 16 cannot be calculated.

[0108] First, the control unit 11 determines the moving direction of the optical camera 18 based on the offset direction of the X-ray tube 16 obtained in step S12 (step S17). That is, the control unit 11 determines the moving direction of the optical camera 18 as the direction in which the movement of the X-ray tube 16 can be calculated.

[0109] Next, the control unit 11 obtains the default movement amount of the optical camera 18 from the storage unit 15 (step S18).

[0110] Next, the control unit 11 uses the second change unit 110 to move the optical camera 18 (step S19). The control unit 11 then proceeds to the arrangement determination process in step S20.

[0111] Therefore, by moving the optical camera 18 little by little along the up-down, front-back, left-right, and rotational directions, repeatedly judging and moving the ball tube 16 to the position judged as well-positioned, the relative positioning of the ball tube 16 and the subject 4 can be automatically optimized.

[0112] <Other>

[0113] In the above arrangement determination process, the position that is initially determined to be well arranged in the arrangement determination (steps S10 and S22) is determined to be the final position, but it is not limited to this example.

[0114] For example, the control unit 11 can also control various moving mechanisms to change the initial position of the X-ray tube 16 and / or the optical camera 18, perform multiple arrangement determination processes, and determine the position with the best arrangement determination result as the final position. The best arrangement determination result means the smallest offset.

[0115] The above description uses optical images acquired by optical camera 18, but is not limited to this.

[0116] For example, a radiographic image obtained by subjecting the X-ray tube 16 to a low dose of radiation can also be used. Furthermore, during a re-enhancing shot, as long as the subject 4 has not moved between the immediate preceding capture and the re-enhancing shot, a radiographic image from the immediate preceding capture can also be used. Alternatively, a goodness-of-care determination can be made based on a serial signal without using a radiographic image (frame image).

[0117] In addition, as described above, the X-ray tube 16 and / or the optical camera 18 are moved automatically by the control unit 11, but this is not a limitation.

[0118] Alternatively, it could be a semi-automatic structure where the movement direction of the X-ray tube 16 and / or the optical camera 18 is fixed by the control unit 11, and the user manually moves the X-ray tube 16 and / or the optical camera 18. Furthermore, the control unit 11 can also display the movement amount to the user on the display unit 13.

[0119] Alternatively, the control unit 11 (decision unit) can also use an analysis model (e.g., a machine learning model) that takes order information and sensor information (information acquired by the optical camera 18 and / or the position information of the X-ray tube acquired by the first change unit) as inputs and outputs shooting conditions such as the radiation irradiation conditions of the X-ray tube 16, the radiation accumulation and readout conditions of the FPD 17, etc., to determine the shooting conditions. Thus, the optimal shooting conditions are derived.

[0120] Imaging conditions include, for example, the size of the irradiation field, the position of the center of the X-ray tube, the incident angle, and the X-ray irradiation conditions (mAs value, tube voltage, filter type, etc.).

[0121] For example, the control unit 11 estimates the thickness of the subject based on the location information and optical image, and determines the tube voltage, tube current, and irradiation time.

[0122] For example, the control unit 11 estimates the contour of the region of interest based on the location information and the optical image, and determines the size of the irradiation field.

[0123] For example, the control unit 11 can accurately position the X-ray tube by finely correcting the position of the center of the X-ray tube and the incident angle based on the offset direction and / or offset amount of the X-ray tube relative to the subject obtained from the optical image and the position information of the X-ray tube.

[0124] Alternatively, sensors such as depth cameras and LiDAR scanners, which can detect the offset between the X-ray tube and the subject, can be used instead of optical cameras 18.

[0125] <Effect>

[0126] Based on the above, the X-ray imaging device 1 includes: an optical camera 18 for capturing optical images; a first changing unit (first changing unit 19) for changing the relative position of the X-ray tube and the subject; and a determination unit (control unit 11) for determining whether the relative arrangement of the X-ray tube and the subject is good based on multiple optical images. The X-ray imaging device 1 performs relative positioning of the X-ray tube and the subject based on the determination result of the determination unit.

[0127] This allows for the automatic optimization of the relative positioning of the X-ray tube and the subject being photographed.

[0128] Furthermore, the radiography method is a radiography method performed by the radiography device 1, wherein the radiography device 1 includes: an optical camera 18 for capturing optical images; and a first changing unit (first changing part 19) for changing the relative position of the X-ray tube and the subject being photographed. The radiography method includes: a determination step (steps S10, S22), which determines whether the relative arrangement of the X-ray tube and the subject being photographed is good based on multiple optical images; and a positioning step (steps S3 to S6, steps S13 to S15), which performs relative positioning of the X-ray tube and the subject being photographed based on the determination result of the determination step.

[0129] This allows for the automatic optimization of the relative positioning of the X-ray tube and the subject being photographed.

[0130] In addition, the program enables the computer of the X-ray imaging device 1 to function as a determination unit (control unit 11) and a positioning unit (control unit 11). The X-ray imaging device 1 includes: an optical camera 18 for capturing optical images; and a first change unit (first change unit 19) for changing the relative position of the X-ray tube and the subject. The determination unit (control unit 11) determines whether the relative arrangement of the X-ray tube and the subject is good based on multiple optical images, and the positioning unit (control unit 11) performs relative positioning of the X-ray tube and the subject based on the determination result of the determination unit.

[0131] This allows for the automatic optimization of the relative positioning of the X-ray tube and the subject being photographed.

[0132] The present invention has been specifically described above based on the embodiments, but the present invention is not limited to the above embodiments and can be modified within the scope of its spirit.

[0133] Furthermore, the above description discloses examples of using semiconductor memory and hard disk as computer-readable media for the program involved in this invention, but it is not limited to these examples.

[0134] As other computer-readable media, it can be used with non-volatile memory such as flash memory and portable recording media such as CD-ROM.

[0135] In addition, a carrier wave can also be used as a medium for providing data of the program involved in this invention via a communication line.

Claims

1. A radiographic apparatus, comprising: Possessing: an optical camera that captures an optical image; a first changing unit that changes a relative position of a tube to an object, a determination unit that determines whether or not the relative arrangement of the tube to the object is good based on a plurality of optical images, the radiographic apparatus performs the relative positioning of the tube to the object based on the determination result of the determination unit.

2. The radiographic apparatus according to claim 1, wherein the first changing unit is a tube moving unit that changes the relative position of the tube to the object by moving the tube based on the optical image.

3. The radiographic apparatus according to claim 1, wherein the determination unit determines whether or not the arrangement is good based on a first optical image captured by the optical camera at a first position, the first changing unit changes the relative position of the tube to the object based on the determination result, the determination unit re-determines whether or not the arrangement is good based on a second optical image captured by the optical camera at a second position after the positions of the tube and the object are relatively changed.

4. The radiographic apparatus according to claim 1, wherein whether or not the relative arrangement is good includes whether or not a capturing position, a capturing angle is good.

5. The radiographic apparatus according to claim 1, wherein possessing a second changing unit that changes a relative position of the optical camera to the object.

6. The radiographic apparatus according to claim 4, wherein the first changing unit and the second changing unit are one changing unit.

7. The radiographic apparatus according to claim 1, wherein possessing a decision unit that decides a capturing condition of radiography by analyzing order information and sensor information as inputs.

8. The radiographic apparatus according to claim 7, wherein the sensor information is information acquired by the optical camera and / or information acquired by a first changing unit.

9. The radiographic apparatus according to claim 7, wherein the capturing condition includes at least any one of a field size, a position of a tube center, an incident angle, an X-ray irradiation condition.

10. The radiographic apparatus according to claim 7, wherein the analysis is machine learning.

11. The radiographic apparatus according to claim 9, wherein the X-ray irradiation condition includes an mAs value, a tube voltage, a filter kind.

12. A radiographic method, which is a radiographic method executed by a radiographic apparatus, wherein The radiographic apparatus possesses: an optical camera that captures an optical image; and a first changing unit that changes a relative position of a tube to an object, the radiographic method includes: a determination step of determining whether or not the relative arrangement of the tube to the object is good based on a plurality of optical images; and a positioning step of performing the relative positioning of the tube to the object based on the determination result of the determination step.

13. A computer program product which causes a computer of a radiographic apparatus to function as a determination section and a positioning section, wherein The radiographic apparatus possesses: an optical camera that captures an optical image; and a first changing unit that changes a relative position of a tube to an object, the determination unit determines whether or not the relative arrangement of the tube to the object is good based on a plurality of optical images, The positioning portion performs relative positioning of the tube and the subject based on the determination result of the determination portion.

Images