Radiation imaging apparatus, radiation imaging system, control method of radiation imaging apparatus, and program

Abstract

To enable offset correction using an appropriately updated offset image even when an acquisition enabled time of the offset image is limited.SOLUTION: A radiation imaging apparatus including a radiation image acquisition unit for acquiring radiation image data on a plurality of subjects in a mode selected from a plurality of modes for acquiring different radiation images, an offset image acquisition unit for acquiring offset image data in each of the plurality of modes, and an offset correction unit for executing offset correction of the radiation image data acquired by using the acquired offset image data is provided with a mode storage unit for storing a mode selected for acquiring the radiation image data on the subject, and an offset image update control unit for causing the offset image acquisition unit to acquire offset image data to be used for offset correction in the stored mode.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a radiation imaging apparatus, a radiation imaging system, a control method for a radiation imaging apparatus, and a program. [Background technology]

[0002] Currently, radiation imaging devices using flat panel detectors made of semiconductor materials are widely used as imaging devices for use in medical image diagnosis and non-destructive testing using radiation. For example, in medical image diagnosis, such radiation imaging devices are used as digital imaging devices for still image capture such as general radiography and video capture such as fluoroscopy. In industrial image diagnosis, they are also used for still image capture and CT scan of semiconductor substrates.

[0003] Here, a radiation image generated by a radiation imaging device includes not only a component corresponding to the incident radiation but also a component corresponding to the dark charge. In order to remove the component corresponding to the dark charge, a correction method is known in which an image acquired when the radiation imaging device is not irradiated with radiation (hereinafter referred to as an offset image) is subtracted from the radiation image. Here, the internal temperature of the radiation imaging device varies depending on the elapsed time after operation, and the amount of generated dark charge varies depending on the internal temperature. Therefore, if there is a difference in acquisition time between the offset image acquisition and the radiation image acquisition, the offset component may not be appropriately removed.

[0004] Patent Document 1 describes a method for performing appropriate offset correction by changing the order of updating offset images in accordance with an examination procedure, measuring the elapsed time after an update, and determining whether or not an update is necessary. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2013-118983 A Summary of the Invention [Problem to be solved by the invention]

[0006] In order to perform the offset correction described above in a radiation imaging device having multiple imaging modes, it is preferable to update the offset images in all imaging modes immediately before imaging. However, when there are many imaging modes, if an attempt is made to update the offset images in all imaging modes, it may take time to acquire the offset images, resulting in a waiting time before imaging. Or, when the imaging interval is short, the next imaging may start in the middle of updating the offset image, resulting in an imaging mode in which the offset image cannot be updated. Even in the method disclosed in Patent Document 1, the elapsed time from the update of the offset image is taken into consideration, but the time required for such an offset image update is not taken into consideration.

[0007] In view of the above problems, one of the objectives of the present disclosure is to provide a radiation imaging device, a radiation imaging system, a control method for a radiation imaging device, and a program for executing the same, which are capable of performing offset correction using an offset image that has been suitably updated even if the time during which the offset image can be acquired is limited. [Means for solving the problem]

[0008] In order to solve the above problem, a radiation imaging apparatus according to an aspect of the present disclosure includes: a radiation image acquisition unit that acquires radiation image data of a plurality of subjects in a mode selected from a plurality of modes for acquiring different radiation images; an offset image acquisition unit capable of acquiring offset image data in each of the plurality of modes; an offset correction unit that performs offset correction of the acquired radiation image data using the acquired offset image data; a mode storage unit that stores a mode selected for acquiring radiation image data of the subject; an offset image update control unit that causes the offset image acquisition unit to acquire offset image data used for the offset correction in the stored mode; Equipped with. Effect of the Invention

[0009] According to one aspect of the present disclosure, even if the time during which an offset image can be acquired is limited, offset correction can be performed using an offset image that has been suitably updated. [Brief description of the drawings]

[0010] [Figure 1] 1 is a diagram illustrating an example of the configuration of a radiation imaging system according to an aspect of the present disclosure. [Diagram 2] 2 is a diagram illustrating an example of the configuration of a radiation detection unit in a radiation imaging apparatus. [Diagram 3] FIG. 1 is a diagram illustrating an example of the configuration of a radiation inspection apparatus. [Figure 4] 1 is a flowchart showing a process flow according to the first embodiment of the present disclosure. [Diagram 5] 10 is a diagram showing mode information of the radiation imaging apparatus according to the present disclosure. [Figure 6] 13 is a flowchart showing a process flow according to the second embodiment when the photographing mode differs for each subject. [Figure 7] 13 is a flowchart showing a process flow according to the third embodiment when an offset image can be selected. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Note that the following embodiments do not limit the invention according to the claims. Although the embodiments describe a number of features, not all of these features are essential to the invention, and the features may be combined in any manner. Furthermore, in the accompanying drawings, the same reference numbers are used for the same or similar configurations, and duplicated descriptions are omitted.

[0012] In the following embodiments, a radiation imaging system using X-rays as an example of radiation will be described, but the radiation imaging system according to the present disclosure may use other radiation. Here, the term radiation includes electromagnetic radiation such as X-rays and gamma rays, as well as particle radiation such as alpha rays, beta rays, particle beams, proton beams, heavy ion beams, and meson beams.

[0013] <Example 1> Hereinafter, a radiation imaging apparatus, a radiation imaging system, and a method for controlling a radiation imaging apparatus according to a first embodiment of the present disclosure will be described with reference to Figs. 1 to 5. Fig. 1 illustrates an example of a configuration of a radiation imaging system 1 according to the present embodiment. The radiation imaging system 1 includes a radiation imaging apparatus 100, a radiation generating apparatus 300, a radiation source 301, a control apparatus 400, and an image control apparatus 500. The radiation imaging apparatus 100 includes a radiation detection unit 200. The radiation generating apparatus 300 controls the radiation source 301 that irradiates radiation. The control apparatus 400 includes a radiation imaging application 404 that controls the radiation imaging apparatus 100 and the radiation generating apparatus 300, collects and displays captured images from the radiation imaging apparatus 100, and is capable of receiving imaging orders and registering imaging information. The image control apparatus 500 outputs captured images output from the radiation imaging apparatus 100 to the control apparatus 400.

[0014] The radiation imaging device 100 includes a radiation detection unit 200 that detects radiation and generates image data, a control unit 101 that controls imaging and communication operations, and a power supply unit 115. The control unit 101 includes a drive control unit 102, an image processing unit 106, an offset image update control unit 108, a storage unit 109, a communication control unit 112, an internal clock 113, and a radiation generation device control unit 114. The drive control unit 102 controls driving of the radiation detection unit 200 and acquisition of radiation images and offset images. The image processing unit 106 performs image processing on the image acquired from the radiation detection unit 200. The offset image update control unit 108 controls the update timing of the offset image and determines whether the image used for offset correction is appropriate. The storage unit 109 stores the acquired image data. The communication control unit 112 controls communication with the control device 400 and communication with the radiation generation device 300. The internal clock 113 acquires the imaging time, elapsed time, and the like. The radiation generating device control unit 114 controls the radiation irradiation timing based on a radiation irradiation signal from the radiation generating device 300.

[0015] The control unit 101, for example, reads out a program or the like stored in the storage unit 109, and based on the program or the like, controls the entire radiation imaging apparatus 100. Note that the control of the radiation imaging apparatus 100 may be performed by a control signal generating circuit such as an ASIC, or may be realized by both a program and a control circuit.

[0016] The radiation generating apparatus 300 has an operation UI (User Interface) 302 for operating the radiation generating apparatus 300. By using the operation UI 302, a user can set radiation irradiation conditions and give instructions related to radiation irradiation. In this embodiment, the radiation generating apparatus 300 and the radiation imaging apparatus 100 are configured to be able to exchange information via a dedicated signal line. Using this dedicated signal line, synchronization signals related to notifications of the start and end of radiation irradiation, notifications of timing when radiation irradiation is possible, and the like are exchanged between the radiation generating apparatus 300 and the radiation imaging apparatus 100.

[0017] The control device 400 includes a communication control unit 401, a radiation imaging device control unit 402, a radiation generation device control unit 403, and a power supply 405. The communication control unit 401 controls communication with the radiation imaging device 100, with the radiation generation device 300, and with, for example, an in-hospital LAN (Local Area Network) (not shown). The radiation imaging device control unit 402 controls the image acquisition timing and image acquisition conditions of the radiation imaging device 100. The radiation generation device control unit 403 controls the radiation irradiation conditions of the radiation generation device 300. The power supply 405 functions as, for example, a main power supply for the control device 400.

[0018] The control device 400 also includes the above-mentioned radiation imaging application 404 that controls the radiation imaging device 100 and the radiation generation device 300, and is capable of acquiring and displaying captured images from the radiation imaging device 100, accepting imaging orders, and registering imaging information. A display unit 406 for displaying captured images and imaging information, and an operation UI (keyboard, mouse, etc.) 407 for operating the radiation imaging application 404 can be connected to the control device 400.

[0019] Here, information can be exchanged between the control device 400 and the radiation imaging device 100, and between the control device 400 and the radiation generating device 300. This information exchange can be achieved by any one or more of cable connection communication using standards such as RS232C, USB, and Ethernet, dedicated signal lines, and wireless communication. Control communication is performed between the control device 400 and the radiation imaging device 100, such as acquisition of image data, setting of image acquisition conditions, and acquisition of information related to the device state. Control communication is performed between the control device 400 and the radiation generating device 300, such as setting of radiation irradiation conditions, acquisition of information related to the device state, and acquisition of actual irradiation information.

[0020] The image control device 500 performs image processing on the image transferred from the radiation imaging device 100, and transfers the processed image to the control device 400. The image control device 500 is further connected to a display unit 501, which is used to display the image output from the radiation imaging device 100, for example, when the control device 400 goes down.

[0021] Although the control device 400 and the image control device 500 are illustrated as separate devices, they can be configured as one unit, and each can be configured as a computer provided with a processor and a memory. Moreover, these control devices 400 and 500 can be configured as a general computer, or as a computer dedicated to the radiation imaging system. Furthermore, these control devices 400 and 500 can be integrated with the display unit 406 and the operation UI 407 to form a single PC (Personal Computer).

[0022] Next, the radiation detection unit 200 will be described. Fig. 2 shows an example of the configuration of the radiation detection unit 200. The radiation detection unit 200 has a sensor array 204 consisting of a plurality of pixels arranged in a two-dimensional array to form a plurality of rows and a plurality of columns. Each pixel 207 on the sensor array 204 is composed of a switch element 208, such as a TFT, and a photoelectric conversion element 209. In addition, for example, a phosphor is provided on each pixel 207. Radiation incident on the radiation detection unit 200 is converted into visible light by the phosphor, and the converted visible light is incident on the photoelectric conversion element 209 of each pixel, and an electric charge corresponding to the visible light is generated in each photoelectric conversion element 209.

[0023] In this embodiment, the radiation detection unit 200 is configured as a so-called indirect conversion type in which incident radiation is converted into electric charge by the above-mentioned phosphor and photoelectric conversion element. However, the radiation detection unit 200 may also be configured as a so-called direct conversion type in which incident radiation is directly converted into electric charge without providing a phosphor. In the radiation detection unit 200, charge accumulation and readout are carried out by switching the switch element 208 between ON and OFF, thereby making it possible to obtain a radiological image.

[0024] The pixels 207 in each row on the two-dimensional sensor array 204 of the radiation detection unit 200 are connected to a drive circuit 201 via drive lines 211 that are arranged corresponding to each row and connected to each of the pixels 207 in each row. When a TFT ON voltage is applied to the drive line 211 by the drive circuit 201, the switch elements 208 of each pixel 207 in a row are turned ON. As a result, the charges accumulated in the pixels 207 are held in the sample hold circuit 202 through the respective signal lines 210. The held pixel output charges are then sequentially read out via the multiplexer 203, amplified by the amplifier 205, and converted into digital image data by the A / D converter 206.

[0025] Furthermore, for each pixel 207 in a row from which the charge has been read out, a TFT OFF voltage is applied to the corresponding drive line 211 by the drive circuit 201, thereby turning off the switch element 208 of each pixel 207 on the row. As a result, each pixel 207 on this row to which a bias voltage has been applied by the power supply 212 returns to a state in which it can accumulate charge. In this manner, the drive circuit 201 sequentially drives and scans each row on the sensor array 204, and finally the charges as the output of all the pixels 207 are converted into digital values. This makes it possible to read out radiation image data. The drive and readout operations of these detection units are controlled by the drive control unit 102. The image data converted into digital values ​​is stored in the memory unit 109 in FIG. 1.

[0026] Next, referring again to Fig. 1, one aspect of the drive control unit 102 in this embodiment will be described. The drive control unit 102 includes an imaging preparation drive control unit 103, a radiographic image acquisition control unit 104, and an offset image acquisition control unit 105. The imaging preparation drive control unit 103 causes the radiation detection unit 200 to perform preparations so that radiation imaging by the radiation imaging device 100 is possible. The radiation image acquisition control unit 104 causes the radiation detection unit 200 to acquire image data used to generate a radiographic image. When acquiring an offset image, the offset image acquisition control unit 105 performs control to switch the offset image to be acquired depending on an imaging mode described later.

[0027] The imaging preparation drive control unit 103 periodically reads out charges while applying the same voltage as during imaging to the radiation detection unit 200, and resets the dark charges accumulated in each pixel. The charges read out at this time are not treated as image data, and need not be stored in the storage unit 109. The radiation image acquisition control unit 104 irradiates radiation to each pixel in a state where charges are accumulated, while performing drive control similar to the imaging preparation drive control on the radiation detection unit 200. The radiation image acquisition control unit 104 reads out image data accumulated in the radiation detection unit 200 by radiation irradiation, and stores this as a radiation image in the radiation image storage unit 110 of the storage unit 109. Continuously performing drive control of the radiation detection unit 200 by the radiation image acquisition control unit 104 makes it possible to capture a radiation image as a moving image.

[0028] The offset image acquisition control unit 105 also performs drive control on the radiation detection unit 200 similar to that performed by the imaging preparation drive control unit 103, while reading out image data from the radiation detection unit 200 in a state where radiation is not being irradiated. The read out image data is stored in the offset image storage unit 111 of the storage unit 109 as an offset image.

[0029] For the radiographic image acquired from the radiation detection unit 200 during imaging, an offset correction process is performed by the offset correction unit 107 of the image processing unit 106 using an offset image previously acquired during non-imaging. The radiographic image that has undergone the offset correction process is transferred to the image control device 500 via the communication control unit 112. Note that although only the offset correction process is described here, correction processes such as correction of defective pixels and gain correction for correcting gain variations of amplifiers in the radiation detection unit may also be performed.

[0030] Furthermore, these correction processes are not limited to being performed by the radiation imaging device 100, and for example, the acquired radiation image and offset image may be transferred to the image control device 500 without correction, and the correction process may be performed within the image control device 500. Furthermore, the offset image used in the offset correction process may be an image that has been subjected to a process of reducing noise components by averaging a plurality of acquired offset images, for example.

[0031] In this embodiment, offset correction is performed on a radiographic image acquired under the control of the radiographic image acquisition control unit 104, using an offset image acquired by the offset image acquisition control unit 105. However, the target for offset correction is not limited to an image. For example, it may be digital data before image generation, or data obtained by subjecting the digital data to the above-mentioned gain correction or other processing. These data may be collectively referred to as image data and offset correction data.

[0032] Next, a radiation inspection apparatus 3 to which the above-mentioned radiation imaging system is applied will be described with reference to FIG. 3. FIG. 3 is a diagram showing an example of the configuration of the radiation inspection apparatus 3 to which the radiation imaging system according to the present embodiment is applied. In FIG. 3, components having the same functions as those shown in FIG. 1 are given the same reference numerals. In FIG. 3, radiation 303 irradiated from a radiation source 301 is incident on the radiation detection unit 200 via an object 304 to be inspected. The object 304 is placed on a conveying system 305, exemplified by a conveyor belt, which is capable of controlling the position of the object 304 to move the object 304. The radiation detection unit 200 converts the radiation incident via the object 304 and the conveying system 305 into an electrical signal. The control device 400 can control the radiation imaging apparatus 100 and output a radiation image. A display unit 406 connected to the control device 400 can display the obtained radiation image and imaging information.

[0033] In the illustrated radiation inspection device 3, when imaging (inspection) of another subject is performed after imaging (inspection) of the subject 304, the conveyor system 305 is moved to move the imaged subject 304 and place the other subject at the inspection position. After switching the subject in this way, imaging (inspection) of the other subject is performed. At that time, since a state in which radiation is not irradiated can be obtained between inspections, an offset image can be acquired at this timing. However, the time required to switch the subject is short, and even if there are multiple imaging modes used in the inspection, it is not easy to acquire offset images for all of these imaging modes.

[0034] A method for acquiring an appropriate offset image in such a short time will be described below with reference to the flowchart shown in Fig. 4. Fig. 4 is a flowchart showing the flow of a radiation imaging process according to one aspect of this embodiment. For example, when a user inputs an instruction to start an examination to the radiation inspection apparatus 3, the control device 400 starts drive control of the radiation generation device 300 and the radiation imaging device 100, and the drive control unit 102 causes the flow to proceed to step S401. Each of the subsequent processes is sequentially performed by the drive control unit 102.

[0035] In step S401, the offset image update control unit 108 acquires offset images of all imaging modes executable in the radiation inspection device 3, and stores these in the offset image storage unit 111 of the storage unit 109. In this embodiment, it is assumed that the radiation inspection device 3 can use imaging modes, for example, from modes A to F illustrated in FIG. 5. In step S401, offset images obtained under the conditions exemplified as modes A to F illustrated in FIG. 5 are acquired sequentially. In this disclosure, acquiring an offset image and storing the acquired offset image is referred to as offset CAL. Also, the offset image acquired in step S401 is referred to as an initial offset image. For example, the initial offset image of mode A is represented as OA1. When the initial offset images OA1 to OF1 are acquired, the flow proceeds to step S402.

[0036] In step S402, the offset image update control unit 108 selects multiple shooting modes to be used in the inspection from among all shooting modes, and sets the number of subjects to be inspected. Here, for example, mode A, mode B, and mode C are selected, and the number of subjects to be inspected is set to 100 in each mode. Note that the selection of the shooting mode and the setting of the number of subjects may be performed, for example, according to an input by a user via the operation UI 407, or may be performed according to a condition set in advance. Once the shooting mode is selected and the number of subjects is set, the flow proceeds to step S403.

[0037] In step S403, the offset image update control unit 108 sets an imaging mode to be used for imaging among the selected imaging modes and the number of radiographic images to be captured in that imaging mode. Here, for example, it is assumed that 50 images are to be captured in mode A for one subject. The set imaging mode and the number of images are stored in the mode storage unit 1091 provided in the storage unit 109. After the imaging mode is set in step S403, the flow proceeds to step S404.

[0038] In step S404, radiation is applied to each pixel during accumulation by the radiation image acquisition control unit 104, the image data is read out, and the obtained image data is stored in the radiation image storage unit 110. In this way, a radiation image of the subject is acquired. For example, here, the radiation image first acquired in mode A of the first subject is represented as radiation image XA1. Once radiation image XA1 has been acquired, the flow proceeds to step S405.

[0039] In step S405, the offset correction unit 107 performs offset correction on the radiation image XA1 acquired in step S404 using the initial offset image OA1 acquired in step S401. After the offset correction is performed, in step S406, the image after the offset correction process is transferred to the image control device 500 via the communication control unit 112. For example, here, the image after the offset correction acquired in the first shooting in mode A is represented as (XA1-OA1=)A1. When the image after the offset correction is output, the flow proceeds to step S407.

[0040] In step S407, the offset image update control unit 108 judges whether or not the imaging is completed. If it is judged that the imaging is not completed, the flow returns to step S404. If it is judged that the imaging is completed, the flow proceeds to the next step S408. Here, in step S403, 50 images are set for the first sample in mode A. Therefore, the offset image update control unit 108 judges whether or not all images A1 to A50 have been obtained. Here, the state in which the first sample is being imaged in mode A is called the first examination in mode A. The processes of steps S404 to S407 are repeated until the image of A50 is obtained. If it is judged that the radiation image of A50 has been obtained, it is assumed that the imaging of the first subject in mode A is completed, and the flow proceeds to step S408.

[0041] In step S408, the offset image update control unit 108 determines whether or not imaging (examination) in the mode selected in step S402 has ended. If it is determined that imaging has not ended, the flow returns to step S403. For example, if imaging has only ended in mode A, the flow returns to step S403, and imaging is performed in the remaining modes B and C. If it is determined that the examination has ended, the flow proceeds to the next step S409.

[0042] For example, assume that the number of shots is set to 50 in all of the modes A, B, and C selected in step S402 for the first inspection. In this case, if images A1 to A50 are obtained in the imaging mode A, in the next step S403, the imaging mode B and the number of shots in that mode are set to 50. In this case, steps S404 to S407 are repeated until images B1 to B50 are obtained in the mode B, and further steps S404 to S407 are repeated through steps S408 and S403 until images C1 to C50 are obtained in the mode C. When 50 images are obtained in each of the modes A to C, the first inspection is completed for the mode selected in step S402. When it is determined in step S408 that the first inspection is completed, the flow proceeds to step S409.

[0043] In step S409, the offset image update control unit 108 judges whether or not there is a next object. If there is a next object, the flow proceeds to step S410. If there is no object, it is assumed that each shooting in the shooting mode selected in step S402 has ended, and the shooting process is ended. By repeating the above steps S402 to S408, shooting (inspection) in the selected mode for the first object is ended. However, since the number of objects is set to 100 in step S402, it is necessary to perform inspection for the remaining 99 objects. Therefore, in step S409, it is judged that there is a next object, and the flow proceeds to step S410. If images in modes A to C are obtained for the 100 objects and the inspection is ended, the offset image update control unit 108 judges that there is no object.

[0044] In step S410, the offset image update control unit 108 stores the multiple shooting modes used in steps S403 to S408 in the mode storage unit 1091. For example, when mode A, mode B, and mode C are used as the shooting modes, the mode storage unit 1091 stores the fact that multiple modes A to C were used. After the shooting modes are stored, the flow proceeds to step S411.

[0045] In step S411, the offset image update control unit 108 acquires the offset images of the shooting modes stored in step S410, and stores them in the offset image storage unit 111 of the storage unit 109. In the above example, for example, the offset images of the modes A to C stored in the first inspection are acquired again, and stored as offset images OA2, OB2, and OC2 in the offset image storage unit 111 of the storage unit 109. When the acquisition of the offset images of the stored shooting modes is completed, the flow returns to step S403. Then, the inspection of the second object is performed using the offset images OA2, OB2, and OC2. Thereafter, the update of the offset images in step S411 and the series of processes in steps S403 to S409 using the updated offset images are repeated as described above. As a result, images of A1 to A50, B1 to B50, and C1 to C50 in each mode are acquired for the remaining objects, and the inspection is completed.

[0046] In the above example, the offset image storage unit 111 updates the initial offset images OA1-OC1 stored in step S401 to the offset images OA2-OC2 stored in step S411 in each shooting mode. However, the initial offset images OA1-OC1 and the newly acquired offset images OA2-OC2 may be stored separately in the offset image storage unit 111. In addition, in step S401, the drive control unit 102 may acquire gain correction data for all shooting modes and store the gain correction data in the storage unit 109. In addition, in step S410, the multiple shooting modes selected in step S402 may be stored.

[0047] For example, when obtaining images for performing an inspection of 100 subjects in the above three modes, a certain amount of time has passed between the time when the image of the first subject is obtained and the time when the image of the 90th subject is obtained. The rise in the internal temperature of the radiation imaging device 100 that occurs during this time lapse may cause a fluctuation in the offset image. Such a fluctuation in the offset image may cause a risk that an appropriate offset correction cannot be performed even if the offset correction of the image of the 90th subject is performed using the above-mentioned initial offset image. In addition, the use of an inappropriate offset image may cause, for example, an afterimage generated during the fourth inspection to remain in the image during the fifth inspection in images obtained during consecutive inspections, for example, in the inspection of the fourth subject and the inspection of the fifth subject. Specifically, when an afterimage caused by the previous radiation irradiation occurs as an offset component, it is possible that the initial offset image previously obtained in step S401 cannot remove such an afterimage.

[0048] That is, in order to use an appropriate offset image for offset correction, it is preferable to obtain an offset image before capturing a radiation image in each mode. In the above example, it is preferable to obtain an offset image at the timing of steps S410 to S411 when moving from the first examination to the second examination. However, in reality, the time available for the processing of steps S410 to S411 is short, and for example, when there are ten types of imaging modes, modes A to J, it is not realistic to obtain all offset images corresponding to these modes. In this embodiment, the imaging mode used in the immediately preceding imaging is stored, and the offset image is updated only for that mode, making it possible to suitably update the required offset image even within a limited time.

[0049] As described above, the radiation imaging device 100 according to an embodiment of the present disclosure includes a radiation image acquisition unit (104), an offset image acquisition unit (105), an offset correction unit (107), a mode storage unit (1091), and an offset image update control unit (108). In the above description, the offset correction is performed using a radiation image and an offset image, but the object used for the offset correction is not limited to an image, and may include data before the image or data after known image processing. Therefore, these images can also be used for the offset correction as radiation image data and offset image data. In this embodiment, the radiation image acquisition control unit 104 functions as a radiation image acquisition unit that acquires radiation images of multiple subjects in a mode selected from multiple modes for acquiring different radiation images, for example, in step S404. The offset image acquisition control unit 105 functions as an offset image acquisition unit that can acquire an offset image in each of the multiple modes, for example, in step S401. The offset image acquisition control unit 105 can acquire an offset image corresponding to the imaging mode set for the examination of the target subject, for example, in step S411. The offset correction unit 107 functions as an offset correction unit that executes offset correction of the acquired radiographic image using the acquired offset image, for example, in step S405. The mode storage unit 1091 functions as a mode storage unit that stores a mode selected for acquiring a radiographic image of a subject, for example, in step S410. The offset image update control unit 108 functions as an offset image update control unit that causes the offset image acquisition unit to acquire an offset image used for offset correction, for example, in step S411, in the stored mode.

[0050] Furthermore, the radiation imaging device 100 according to an embodiment of the present disclosure may also be configured to include a radiation image acquisition section (104), an offset image acquisition section (105), an offset correction section (107), and an offset image update control section (108). In this case, the offset image update control section 108 may cause the offset image acquisition control section 105 to acquire an offset image in the selected mode before acquiring a radiation image of a next subject among the multiple subjects. The acquired offset image is used for offset correction of the next radiation image.

[0051] As described above, the offset image update control unit 108 causes the offset image acquisition control unit 105 to acquire an offset image used for offset correction in the stored mode. The acquisition of this offset image can be performed after the offset correction of a radiographic image acquired in the selected mode for one of the multiple subjects is completed. In addition, the offset image acquired in the stored imaging mode can be used for the offset correction of a radiographic image of a subject next to the one subject for which the radiographic image for which the offset correction has been completed is acquired.

[0052] By executing the above process, in the inspection of multiple subjects, offset CAL of multiple imaging modes used in the immediately preceding inspection can be performed by utilizing the time between one inspection and the next inspection. In this way, by updating the offset image only for the imaging mode expected to be used, it becomes possible to update the offset image even within the limited time between inspections. Therefore, it becomes possible to perform offset correction using a suitable offset image.

[0053] <Example 2> Next, as a second embodiment of the present disclosure, an application example in which the imaging mode differs for each subject will be described with reference to FIG. 6. The configuration of the radiation imaging device 100 and the configuration of the radiation inspection device 3 used in this embodiment are the same as those in the first embodiment, and therefore the description here will be omitted. FIG. 6 is a flowchart showing a process flow in which the imaging mode differs for each subject. In the flowchart described in FIG. 4, the same multiple imaging modes are repeatedly executed, but in an actual inspection, different imaging modes may be selected for each subject. For example, in the first inspection, modes A to C are selected, and the number of subjects (sample number) is set to 100 in each of them. Usually, modes A to C are selected in the same way in the second, third, or subsequent inspections, but for example, in the middle of inspecting multiple subjects, modes A, B, and D may be selected in the fourth inspection (fourth subject). Such a case will be described below.

[0054] In this embodiment, first, in step S601, the offset image update control unit 108 acquires offset images of all imaging modes executable in the radiation inspection apparatus 3, and stores these in the offset image storage unit 111. In this embodiment, it is assumed that the radiation inspection apparatus 3 is capable of using imaging modes A to F shown in Fig. 5, for example. In step S601, offset images obtained under the conditions exemplified as modes A to F shown in Fig. 5 are acquired sequentially. When the initial offset images OA1 to OF1 are acquired, the flow proceeds to step S602.

[0055] In step S602, the offset image update control unit 108 selects multiple imaging modes to be used in the inspection from among all imaging modes, and sets the number of subjects to be inspected. In this embodiment, multiple imaging modes are selected for each inspection, but the number of subjects needs to be set only the first time. Once the imaging mode is selected and the number of subjects is set, the flow proceeds to step S603.

[0056] In step S603, the offset image update control unit 108 sets the shooting mode to be used for shooting from the selected multiple shooting modes and the number of images to be shot in that shooting mode. Here, for example, it is assumed that 50 images are set in mode A. The set shooting mode and the number of images to be shot are stored in the mode storage unit 1091 provided in the storage unit 109. After the shooting mode is set in step S603, the flow proceeds to step S604.

[0057] The processes executed in steps S604 to S607 are the same as those executed in steps S404 to S407 described in the first embodiment, and therefore the description thereof will be omitted here. In step S608, for example, if 50 images have been acquired in mode A from the first object, the flow returns to step S603, the selected mode B is set as the shooting mode for the first object, and acquisition of 50 images is set. Thereafter, after steps S604 to S607 are executed, next, in step S602, shooting in mode C and acquisition of 50 images are set for the first object. In this way, 50 images (A1 to A50, B1 to B50, C1 to C50) have been acquired in each mode, and when it is determined in step S608 that the first examination has ended, the flow proceeds to step S609.

[0058] In step S609, the offset image update control unit 108 determines whether or not there is a next subject (whether or not there is a second inspection). If there is a next subject, the flow proceeds to step S610. For example, in step S602, if images are obtained in the selected mode for 100 subjects in each set mode and inspection of the 100 subjects is completed, the offset image update control unit 108 determines that there is no next subject. If it is determined in step S609 that there is no next subject, all inspections are completed.

[0059] In step S610, the offset image update control unit 108 stores the multiple shooting modes used in steps S603 to S608 in the mode storage unit 1091. For example, when mode A, mode B, and mode C are used as the shooting modes, the mode storage unit 1091 stores the fact that multiple modes A to C were used. After the shooting modes are stored, the flow proceeds to step S611.

[0060] In step S611, the offset image update control unit 108 acquires the offset images of the shooting modes stored in step S610, and these are stored in the offset image storage unit 111 of the storage unit 109. In the above example, for example, the offset images of the multiple modes A to C stored in the first inspection are acquired again, and these are stored as offset images OA2, OB2, and OC2 in the offset image storage unit 111 of the storage unit 109. When acquisition of the offset images of the multiple stored shooting modes is completed, the flow returns to step S602. Through the series of processes from step S602 to step S611 above, the offset images are updated for the second subject, and preparations are made for the inspection of the second subject.

[0061] In this embodiment, for example, the inspections in the multiple imaging modes selected in step S602 are repeatedly performed on all subjects. Then, between inspections, offset CAL is performed for the multiple imaging modes used immediately before, and the offset images are used in the next inspection. Here, as described above, it is assumed that modes A to C are selected in the first to third inspections, and modes A, B, and D are selected as the imaging modes in the fourth inspection. In this case, the initial offset image OD1 acquired in step S601 is used for offset correction of the image of the subject photographed in mode D.

[0062] However, in step S611 after the fourth inspection is completed, offset images OA5, OB5, and OD5 are acquired in modes A, B, and D. Then, the offset image OD5 of mode D acquired in step S611 is used for offset correction when mode D is selected in the fifth or subsequent inspection, for example, the sixth inspection. Then, in this embodiment, the inspection is completed when inspections of 100 subjects in all of the modes selected in step S602 are completed.

[0063] In the above example, the offset image storage unit 111 updates the initial offset image stored in step S601 to the offset image stored in step S611 in each shooting mode. However, the offset image storage unit 111 may store the initial offset image obtained in each shooting mode separately from the newly acquired offset image. In addition, in step S601, the drive control unit 102 may obtain gain correction data for all shooting modes and store the gain correction data in the storage unit 109. In addition, in step S610, the multiple shooting modes selected in step S602 may be stored.

[0064] By executing the above steps, offset CAL can be performed for multiple imaging modes used in the immediately preceding examination by utilizing the time between examinations. As a result, by updating the offset image only for the imaging mode expected to be used, it becomes possible to update the offset image even within the limited time between examinations. Therefore, it becomes possible to perform offset correction using a suitable offset image.

[0065] <Example 3> In the second embodiment, the first examination in the above-mentioned mode D may be affected by offset fluctuation due to the passage of time after the initial offset image OD1 is acquired. In the third embodiment, for example, a process of selecting an offset image to be used for offset correction in the first examination in the above-mentioned mode D and performing offset correction suitably will be described with reference to FIG. 7. Note that the configuration of the radiation imaging device 100 and the configuration of the radiation examination device 3 used in this embodiment are the same as those in the first embodiment, so the description here will be omitted. FIG. 7 is a flowchart showing the flow of a process in which an offset image can be selected. In the following, as in the second embodiment, a case will be described as an example in which the number of subjects is set to 100, modes A to C are selected for the first to third examinations, and modes A, B, and D are selected as the imaging modes for the fourth examination.

[0066] In this embodiment, the processes from the offset CAL process in step S701 to the mode setting process in step S703 are the same as those in steps S601 to S603 in embodiment 2. In step S703, for example, when it is set that 50 shots are to be taken from one subject in mode A, the flow proceeds to step S704.

[0067] In step S704, the offset image update control unit 108 determines whether the inspection is the first one. If the inspection is the first one, the flow proceeds to step S708. If the inspection is not the first one (if the inspection is the second or subsequent inspection), the flow proceeds to step S705.

[0068] In step S708, the offset image update control unit 108 selects an offset image in the same shooting mode. After the selection, the flow proceeds to step S709. For example, assume that modes A to C are selected as multiple shooting modes in step S702 in the first inspection. When mode A is set in step S703, the initial offset image OA1 acquired in step S701 is selected as the offset image. Similarly, in the first inspection, initial offset images OB1 and OC1 are selected in modes B and C as well.

[0069] The processes executed in steps S709 to S714 are the same as those executed in steps S604 to S609 in the second embodiment, except for the offset image used in the process executed in step S710. Therefore, a description thereof will be omitted here. The offset image used in step S710 will be described later. In step S714, it is determined whether there is a next subject. If there is a next subject, the flow proceeds to step S715. In step S714, it is determined whether the inspection of the 100 subjects set in step S702 has been completed, for example. If it is determined in step S714 that there is a subject that has not yet been inspected, the flow proceeds to step S715.

[0070] In step S715, the offset image update control unit 108 stores the multiple shooting modes used in steps S703 to S714 in the storage unit 109. For example, when mode A, mode B, and mode C are used as the shooting modes, the mode storage unit 1091 stores the fact that multiple modes A to C were used. After the shooting modes are stored, the flow proceeds to step S716.

[0071] In step S716, the offset image update control unit 108 acquires the offset images of the shooting modes stored in step S715, and these are stored in the offset image storage unit 111 of the storage unit 109. In the above example, for example, the offset images of the multiple modes A to C stored in the first inspection are acquired again, and these are stored as offset images OA2, OB2, and OC2 in the offset image storage unit 111. When acquisition of the offset images of the multiple stored shooting modes is completed, the flow returns to step S702. Through the series of processes from step S709 to step S715 above, the offset images are updated for the second subject, and preparations are made for the inspection of the second subject.

[0072] If it is determined in step S704 that the examination to be performed after the mode setting in step S703 is the second or later, the flow proceeds to step S705. In the second or later examination, the offset image update control unit 108 determines in step S705 whether the shooting mode set in step S703 is included in the multiple shooting modes stored in step S715. If it is determined that the shooting mode is included, the flow proceeds to step S708. If it is determined that the shooting mode is not included, the flow proceeds to step S706.

[0073] For example, assume that imaging is performed in modes A to C in the third examination, and modes A, B, and D are selected in step S702 in the fourth examination. If mode D is set as the imaging mode in step S703 of the fourth examination, it is determined in step S705 that mode D, which is the set imaging mode, is not among modes A to C stored in step S715, and the flow proceeds to step S706.

[0074] In step S706, the offset image update control unit 108 determines whether or not the offset image of the same imaging mode previously acquired can be used. If it is determined that it can be used, the flow proceeds to step S708. If it is determined that it cannot be used, the flow proceeds to step S707. For example, as described above, it is assumed that imaging is performed in modes A to C in the first to third examinations, and modes A, B, and D are selected as imaging modes in the fourth examination in step S702. In step S706, it is determined whether or not the offset image (OD1) of the same mode acquired in step S701 can be used for the radiation image acquired in mode D.

[0075] Next, an example of the determination method performed in step S706 will be described. As a determination method, for example, the mode with the highest sensitivity setting or the mode with the shortest accumulation time is first selected from the offset images OA4, OB4, and OC4 acquired in step S716 after the third inspection. According to the example shown in Fig. 5, in this case, the determination is performed using the offset image captured in mode C.

[0076] A specific determination process can be performed, for example, by the following calculation. That is, the average value of all pixels of offset image OC4 is OC4ave, and the average value of all pixels of initial offset image OC1 is OC1ave. The difference (OC41ave=OC4ave-OC1ave) is OC41ave. Next, the difference between offset image OC4 and initial offset image OC1 is taken. The image is taken as image OC41. An image (OC41z=OC41-OC41ave) generated from the difference between image OC41 and pixel value OC41ave is taken as image OC41z for afterimage determination. When pixel values ​​are plotted in the horizontal direction at the center of image OC41z for afterimage determination, if there are 10 or more consecutive pixels with pixel values ​​that are ±100LSB or more from the reference 0LSB, it is determined that there is an afterimage.

[0077] In this case, since it is determined that there is an afterimage in the offset image OC4, it is determined that the offset image OD1 of the same mode cannot be used for the radiation image acquired in mode D, and the flow proceeds to step S707. If it is determined that there is no afterimage in the offset image OC4, it is highly likely that there will also be no afterimage in mode D between the offset image acquired in mode D, which is assumed to be acquired at the timing when the offset image OC4 is acquired, and the initial offset image OD1. Therefore, it is determined that the offset image OD1 acquired in the same imaging mode, mode D, can be used, and the flow proceeds to step S708.

[0078] In step S707, the offset image update control unit 108 selects, among the offset images acquired in step S716, the offset image having the closest accumulation time as the offset image to be used in mode D. After the selection, the flow proceeds to step S709.

[0079] Here, an example is described in which modes A to C are selected in the third examination, and modes A, B, and D are selected in the fourth examination. In this case, in step S703 of the fourth examination, mode D is set as the imaging mode, and in step S706, it is determined that the offset image OD1 of the same imaging mode cannot be used. In this case, in this embodiment, offset correction is performed using any of the offset images OA4, OB4, and OC4 acquired immediately before. In this embodiment, which of the three offset images is selected is based on the accumulation time, and an offset image according to the mode whose accumulation time is closest to mode D is selected. For example, according to FIG. 5, the accumulation time is 10 ms in mode A, 15 ms in mode B, 5 ms in mode C, and 7 ms in mode D. In this case, the offset image whose accumulation time is closest to mode D is mode C. As a result, the radiation image captured in mode D in the fourth examination is offset corrected using the offset image OC4.

[0080] In the above step S706, the determination of whether an offset image of the same shooting mode can be used may be performed based on the offset variation. In this case, first, the variation rate of the average value between the pixel values ​​of the initial offset image and the pixel values ​​of the offset image acquired immediately before is calculated. If the variation rate is equal to or greater than a threshold value, it is determined that there is an offset variation. For example, in the example described here, the variation rate of the average value is compared with the threshold value using the initial offset image OA and the offset image OA4 acquired in step S716 after the third inspection. If the variation rate of the average value is equal to or greater than ±20%, it is determined that there is an offset variation. Note that the value used for this determination is not limited to the variation rate exemplified, and the pixel value resulting from the difference may also be used. In this case, if the pixel value resulting from the difference is equal to or greater than a threshold value, it can be determined that there is a variation. Furthermore, the above-described determination of the offset variation and the determination of the residual image may be combined to perform the process of step S706. Alternatively, either one of them may be used.

[0081] In addition, when the determination is made based on the presence or absence of an afterimage in step S706, the location on the image used for the determination may be one location or multiple locations. When the determination is made at multiple locations, if 10 or more consecutive pixels have pixel values ​​that are ±100LSB or more from the reference 0LSB at any of the multiple locations, it can be determined that there is an afterimage. In this case, for example, pixel values ​​can be plotted horizontally at three locations, 1 / 4, 1 / 2, and 3 / 4 vertically of the afterimage determination image OC41z, to perform the afterimage determination.

[0082] Moreover, the above step S706 may be omitted. If the set imaging mode is not included in the imaging modes used in the immediately previous examination, the process may proceed to step S708 without judging the immediately previous offset image.

[0083] Furthermore, in step S707, if there are multiple modes with the closest accumulation time, the most recently acquired shooting mode among the offset images updated in step S716 can be used. Alternatively, the shooting mode with the closest sensitivity setting can be used, or these can be combined. Also, if there are multiple modes with the closest sensitivity setting, the offset image of the most recently acquired shooting mode among the offset images updated in step S716 can be used.

[0084] In addition, in the above step S707, if the offset image of the shooting mode with the closest accumulation time is selected and the sensitivity setting of the shooting mode to be used is different, the sensitivity setting may be corrected to be the same as the sensitivity setting of the shooting mode to be used. For example, assume that the offset image OB4 is selected for offset correction of the shooting mode E in the fourth inspection. In that case, the pixel value may be multiplied by the ratio of the medium sensitivity and the low sensitivity as a coefficient so that the offset image OB4 becomes the same as the sensitivity setting of the shooting mode E (medium in the example of FIG. 5).

[0085] As described above, in the radiation imaging apparatus according to the present embodiment, it is assumed that a mode not stored in the mode storage unit 1091 is selected from among the multiple modes when acquiring radiation image data of a next subject after a given subject. In such a case, an offset image acquired in a mode not stored in the mode storage unit 1091 is selected from among the multiple offset images (OA1 to OF1) acquired in each of the multiple modes. The offset correction unit 107 can execute offset correction using this selected offset image. Furthermore, in such a case, it is also possible to select an offset image acquired in a mode having at least one of the accumulation time and the sensitivity setting closest to the mode stored in the mode storage unit 1091 from among the multiple modes. The offset correction unit 107 can execute offset correction using this selected offset image. Alternatively, it is also possible to select an offset image acquired in a mode selected when acquiring a radiation image of a next subject from among the multiple offset images acquired in each of the multiple modes. The offset correction unit 107 can execute offset correction using this selected offset image.

[0086] Furthermore, in this embodiment, the offset image update control unit 108 can determine whether or not there is an afterimage in the offset image acquired in the mode stored in the mode storage unit 1091 before acquiring the radiation image data of the next subject. If it is determined that there is an afterimage, it can select an offset image acquired in a mode having at least one of the accumulation time and the sensitivity setting closest to the mode stored in the mode storage unit 1091 among the multiple modes. The offset correction unit 107 can execute offset correction using this selected offset image. The offset image update control unit 108 can also obtain a fluctuation rate of the offset image by comparing an offset image acquired in a mode stored in the mode storage unit 1091 before acquiring the radiation image of the next subject with an offset image acquired in a mode selected before acquiring the radiation image of one subject. If the fluctuation rate is equal to or greater than a threshold value, it can also select an offset image acquired in a mode having at least one of the accumulation time and the sensitivity setting closest to the mode stored in the mode storage unit 1091 among the multiple modes. The offset correction unit 107 can execute offset correction using this selected offset image.

[0087] As described above, the present disclosure can also configure a radiation imaging system 1 or a radiation inspection apparatus 3. In this case, the radiation imaging system 1 or the radiation inspection apparatus 3 includes a radiation generating apparatus 300, a control device 400, and the above-described radiation imaging apparatus 100. In the above-described embodiment, the radiation generating apparatus 300 functions as a radiation generating apparatus that generates radiation in the present disclosure. Furthermore, the control device 400 functions as a control device that controls the radiation generating apparatus 300.

[0088] By performing the above steps, a method for determining which offset image to select can be provided, and as a result, even if an imaging mode different from the imaging modes used in the immediately preceding examination is set, it becomes possible to perform offset correction using an optimal offset image.

[0089] (Other Examples) The present disclosure can also be realized by a process in which a program for implementing one or more functions of the above-described embodiments is supplied to a system or device via a network or a storage medium, and one or more processors in the computer of the system or device read and execute the program. It can also be realized by a circuit (e.g., ASIC) for implementing one or more functions. A computer may have one or more processors or circuits, and may include separate computers or a network of separate processors or circuits for reading and executing computer-executable instructions.

[0090] The processor or circuitry may include a central processing unit (CPU), a microprocessing unit (MPU), a graphics processing unit (GPU), an application specific integrated circuit (ASIC), or a field programmable gateway (FPGA), and the processor or circuitry may include a digital signal processor (DSP), a data flow processor (DFP), or a neural processing unit (NPU).

[0091] The above disclosure includes the following configurations, methods, and programs. (Configuration 1) a radiation image acquisition unit that acquires radiation image data of a plurality of subjects in a mode selected from a plurality of modes for acquiring different radiation images; an offset image acquisition unit capable of acquiring offset image data in each of the plurality of modes; an offset correction unit that performs offset correction of the acquired radiation image data using the acquired offset image data; a mode storage unit that stores a mode selected for acquiring radiation image data of the subject; an offset image update control unit that causes the offset image acquisition unit to acquire offset image data used for the offset correction in the stored mode; A radiation imaging apparatus comprising: (Configuration 2) The radiation imaging device according to configuration 1, wherein the offset image update control unit causes the offset image acquisition unit to acquire offset image data used for the offset correction in the stored mode after offset correction of radiation image data acquired in the selected mode for one of the plurality of subjects is completed. (Configuration 3) The radiation imaging device according to configuration 2, wherein the offset image data acquired in the stored imaging mode is used for offset correction of radiation image data of a subject subsequent to the one subject for which the radiation image data for which the offset correction has been completed has been acquired. (Configuration 4) A radiation imaging device according to configuration 2 or 3, wherein when a mode not stored in the mode memory unit is selected from the plurality of modes when acquiring radiation image data of a subject subsequent to the one subject, the offset correction unit selects offset image data acquired in a mode not stored in the mode memory unit from among the plurality of offset image data acquired by the offset image acquisition unit in each of the plurality of modes, and performs the offset correction. (Configuration 5) The radiation imaging device according to any one of configurations 1 to 4, wherein the offset correction unit selects, from among the plurality of modes, offset image data acquired in a mode having at least one of an accumulation time and a sensitivity setting closest to a mode stored in the mode storage unit, and performs the offset correction. (Configuration 6) A radiation imaging device according to any one of configurations 1 to 5, wherein the offset correction unit selects offset image data acquired in a mode selected when acquiring radiation image data of a subject subsequent to the one subject from among a plurality of offset image data acquired by the offset image acquisition unit in each of the plurality of modes, and performs the offset correction. (Configuration 7) the offset image update control unit determines whether or not there is a residual image in the offset image data acquired in the mode stored in the mode storage unit before acquiring radiation image data of the next object after the one object; A radiation imaging device according to any one of configurations 1 to 6, wherein when it is determined that there is an afterimage, the offset correction unit selects offset image data acquired in a mode from among the plurality of modes that has at least one of an accumulation time and a sensitivity setting closest to the mode stored in the mode memory unit, and performs the offset correction. (Configuration 8) the offset image update control unit obtains a fluctuation rate of the offset image by comparing the offset image data acquired in the mode stored in the mode storage unit before acquisition of the radiation image data of the next subject after the one subject with the offset image data acquired in the selected mode before acquisition of the radiation image data of the one subject; A radiation imaging device described in any one of configurations 1 to 7, wherein when the fluctuation rate is equal to or greater than a threshold value, the offset correction unit selects offset image data acquired in a mode among the multiple modes that has at least one of an accumulation time and a sensitivity setting closest to the mode stored in the mode memory unit, and performs the offset correction. (Configuration 9) a radiation image acquisition unit that acquires radiation image data of a plurality of subjects in a mode selected from a plurality of modes for acquiring different radiation images; an offset image acquisition unit capable of acquiring offset image data in each of the plurality of modes; an offset correction unit that performs offset correction of the acquired radiation image data using the acquired offset image data; an offset image update control unit that causes the offset image acquisition unit to acquire offset image data in the selected mode for the offset correction of the next radiation image data before acquisition of radiation image data of a next subject among the plurality of subjects; A radiation imaging apparatus comprising: (Configuration 10) A radiation generating device that generates radiation; A control device for controlling the radiation generating device; A radiation imaging device according to any one of configurations 1 to 9, A radiation imaging system comprising: (Method 1) acquiring radiation image data of a subject in a mode selected from a plurality of modes for acquiring different radiation images; acquiring offset image data in each of the plurality of modes; performing an offset correction of the acquired radiation image data using the acquired offset image data; storing a selected mode for acquiring radiation image data of the subject; reacquiring offset image data used for the offset correction in the stored mode; A method for controlling a radiation imaging apparatus comprising: (Method 2) acquiring radiation image data of a plurality of subjects in a mode selected from a plurality of modes for acquiring different radiation images; acquiring offset image data in each of the plurality of modes; performing an offset correction of the acquired radiation image data using the acquired offset image data; before acquiring radiation image data of a next object among the plurality of objects, acquiring offset image data in the selected mode again for the offset correction of the next radiation image data; A method for controlling a radiation imaging apparatus comprising: (program) A program that, when executed by a processor, causes the processor to execute the method for controlling a radiation imaging apparatus according to the first or second method. [Explanation of symbols]

[0092] 100: Radiation imaging device 101: Control unit 102: Drive control unit 103: Shooting preparation drive control unit 104: Radiation image acquisition control unit 105: Offset image acquisition control unit 106: Image processing unit 107: Offset correction section 108: Offset image update control unit 109: Storage section 110: Radiation image storage unit 111: Offset image storage unit 112: Communication control unit 113: Internal clock 114: Radiation generating device control unit 200: Radiation detection unit 300: Radiation Generator 301:Radiation source 400: Control device 500: Image control device

Claims

1. a radiation image acquisition unit that acquires radiation image data of a plurality of subjects in a mode selected from a plurality of modes for acquiring different radiation images; an offset image acquisition unit capable of acquiring offset image data in each of the plurality of modes; an offset correction unit that performs offset correction of the acquired radiation image data using the acquired offset image data; a mode storage unit that stores a mode selected for acquiring radiation image data of the subject; an offset image update control unit that causes the offset image acquisition unit to acquire offset image data used for the offset correction in the stored mode; A radiation imaging apparatus comprising:

2. 2. The radiation imaging device according to claim 1, wherein the offset image update control unit causes the offset image acquisition unit to acquire offset image data used for the offset correction in the stored mode after offset correction of radiation image data acquired in the selected mode for one of the plurality of subjects is completed.

3. 3. The radiation imaging device according to claim 2, wherein the offset image data acquired in the stored imaging mode is used for offset correction of radiation image data of a subject subsequent to the one subject for which the radiation image data for which the offset correction has been completed has been acquired.

4. 3. The radiation imaging device according to claim 2, wherein when a mode not stored in the mode storage unit is selected from the plurality of modes when acquiring radiation image data of a subject subsequent to the one subject, the offset correction unit selects offset image data acquired in a mode not stored in the mode storage unit from among the plurality of offset image data acquired by the offset image acquisition unit in each of the plurality of modes, and performs the offset correction.

5. 5. The radiation imaging device according to claim 4, wherein the offset correction unit selects, from among the plurality of modes, offset image data acquired in a mode having at least one of an accumulation time and a sensitivity setting closest to a mode stored in the mode storage unit, and performs the offset correction.

6. 5. The radiation imaging device according to claim 4, wherein the offset correction unit selects offset image data acquired in a mode selected when acquiring radiation image data of the next subject from among the plurality of offset image data acquired by the offset image acquisition unit in each of the plurality of modes, and performs the offset correction.

7. the offset image update control unit determines whether or not there is a residual image in the offset image data acquired in the mode stored in the mode storage unit before acquiring the radiation image data of the next subject; 5. The radiation imaging device according to claim 4, wherein when it is determined that there is an afterimage, the offset correction unit selects offset image data acquired in a mode among the plurality of modes that has at least one of an accumulation time and a sensitivity setting closest to the mode stored in the mode storage unit, and performs the offset correction.

8. the offset image update control unit obtains a fluctuation rate of the offset image by comparing the offset image data acquired in the mode stored in the mode storage unit before acquiring the radiation image data of the next subject with the offset image data acquired in the selected mode before acquiring the radiation image data of the one subject; 5. The radiation imaging device according to claim 4, wherein when the rate of change is equal to or greater than a threshold value, the offset correction unit selects offset image data acquired in a mode among the plurality of modes that has at least one of an accumulation time and a sensitivity setting closest to a mode stored in the mode storage unit, and performs the offset correction.

9. a radiation image acquisition unit that acquires radiation image data of a plurality of subjects in a mode selected from a plurality of modes for acquiring different radiation images; an offset image acquisition unit capable of acquiring offset image data in each of the plurality of modes; an offset correction unit that performs offset correction of the acquired radiation image data using the acquired offset image data; an offset image update control unit that causes the offset image acquisition unit to acquire offset image data in the selected mode for the offset correction of the next radiation image data before acquisition of radiation image data of a next subject among the plurality of subjects; A radiation imaging apparatus comprising:

10. A radiation generating device that generates radiation; A control device for controlling the radiation generating device; A radiation imaging apparatus according to any one of claims 1 to 9, A radiation imaging system comprising:

11. acquiring radiation image data of a subject in a mode selected from a plurality of modes for acquiring different radiation images; acquiring offset image data in each of the plurality of modes; performing an offset correction of the acquired radiation image data using the acquired offset image data; storing a selected mode for acquiring radiation image data of the subject; reacquiring offset image data used for the offset correction in the stored mode; A method for controlling a radiation imaging apparatus comprising:

12. acquiring radiation image data of a plurality of subjects in a mode selected from a plurality of modes for acquiring different radiation images; acquiring offset image data in each of the plurality of modes; performing an offset correction of the acquired radiation image data using the acquired offset image data; before acquiring radiation image data of a next object among the plurality of objects, acquiring offset image data in the selected mode again for the offset correction of the next radiation image data; A method for controlling a radiation imaging apparatus comprising:

13. A program that, when executed by a processor, causes the processor to execute the method for controlling a radiation imaging apparatus according to claim 11 or 12.

Images