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

Abstract

To prevent unnecessary gain calibration from being continued in a radiation imaging device.SOLUTION: A radiation imaging device includes: acquisition means for acquiring a radiation image based on a radiation made incident; gain correction means for correcting the radiation image using gain correction data acquired by performing gain calibration; and control means for controlling continuation of the gain calibration on the basis of the radiation image acquired while the gain calibration is executed under a plurality of conditions.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Radiation imaging devices using flat panel detectors (FPDs) made of semiconductor materials are widely used as imaging devices used in medical image diagnosis and non-destructive testing using radiation. The scintillator of the flat panel detector may vary in characteristics in response to irradiation with radiation, and a phenomenon called "burn-in (bright burn)" may occur. Burn-in causes artifacts or a residual image of the subject in the captured image, but there is a problem that it takes time to return to the original state (for the burn-in to disappear), so a correction method for removing the artifacts or the residual image of the subject caused by the burn-in is known. Patent Document 1 discloses a correction method using an image obtained by calculating parameters from the current burn-in image captured, the previous burn-in correction image, and the burn-in information image. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2003-185752 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the method disclosed in Patent Document 1, when pixel values ​​are saturated due to a large amount of radiation exposure such as in non-destructive testing, the amount of burn-in cannot be correctly estimated from the image. Therefore, unless gain correction of the flat panel detector is performed, it may not be possible to immediately remove artifacts caused by burn-in or residual images of the photographed subject. However, in order to perform gain correction of the flat panel detector, it may be necessary to obtain multiple gain correction data by combining conditions such as the gain and binning of the flat panel detector, and it takes a lot of time and effort to perform gain calibration under multiple conditions. In addition, if the burn-in has returned to its original state, there may be no need to perform gain calibration.

[0005] An object of the present invention is to prevent unnecessary gain calibration from being continued in a radiation imaging apparatus. [Means for solving the problem]

[0006] The radiation imaging device according to the present invention is characterized in having an acquisition means for acquiring a radiation image based on incident radiation, a gain correction means for correcting the radiation image using gain correction data acquired by performing gain calibration, and a control means for controlling continuation of the performance of the gain calibration based on the radiation images acquired during the performance of the gain calibration under a plurality of conditions. Effect of the Invention

[0007] According to the present invention, in a radiation imaging apparatus, it is possible to prevent unnecessary gain calibration from being continued. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram illustrating an example of the configuration of a radiation imaging system. [Diagram 2] 2 is a diagram illustrating an example of the hardware configuration of a control unit in the radiation imaging apparatus. [Diagram 3]11 is a flowchart illustrating an example of a determination as to whether or not to continue gain calibration and a process after the determination. [Figure 4] FIG. 13 is a diagram showing an example of dividing a radiation image. [Diagram 5] 11 is a flowchart illustrating an example of a determination as to whether or not to continue gain calibration and a process after the determination. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that in the following embodiments, radiation is not limited to X-rays, and may also include, for example, α-rays, β-rays, γ-rays, particle rays, cosmic rays, etc.

[0010] 1 is a diagram showing an example of the configuration of a radiation imaging system according to this embodiment. The radiation imaging system includes a radiation imaging device 100 having a radiation detection unit 101, a radiation generating device 130 that controls a radiation source 131 that irradiates radiation, and a control device 140 that controls the radiation imaging device 100 and the radiation generating device 130. The radiation imaging device 100, the radiation generating device 130, and the control device 140 are connected to each other so as to be able to communicate with each other.

[0011] The radiation imaging device 100 has a radiation detection unit 101, a control unit 102, and a power supply unit 114. The radiation detection unit 101 detects incident radiation and generates a radiation image (image data) according to the dose of the detected radiation. The radiation detection unit 101 has a plurality of pixels arranged in a two-dimensional array, each having a conversion element including a scintillator (phosphor) that converts incident radiation into light (e.g., visible light) and a photoelectric conversion element that converts the light generated by the scintillator into an electrical signal.

[0012] The control unit 102 controls imaging and communication operations in the radiation imaging apparatus 100. The control unit 102 includes an image acquisition unit 103, an image processing unit 104, a storage unit 106, a gain correction data acquisition determination unit 109, and a communication unit 112.

[0013] The image acquisition unit 103 acquires image data including a radiological image corresponding to irradiation with radiation from the radiation detection unit 101. The image acquisition unit 103 has a gain correction data acquisition control unit 113 that acquires gain correction data from the radiation detection unit 101. The gain correction data acquisition control unit 113 acquires gain correction data from the radiation detection unit 101 and performs gain calibration based on the result from the gain correction data acquisition determination unit 109. The image processing unit 104 performs image processing on the image acquired from the radiation detection unit 101. The image processing unit 104 has a gain correction unit 105 that corrects the radiological image obtained by shooting using gain correction data 108 stored in the storage unit 106. The storage unit 106 stores the acquired radiological image 107, the gain correction data 108 acquired in advance, etc.

[0014] The gain correction data acquisition determination unit 109 performs a determination as to whether or not to continue the gain calibration while the gain calibration is being performed. The gain correction data acquisition determination unit 109 has a specified value 110 that can be changed by an operator or the like. The gain correction data acquisition determination unit 109 also has a calculation unit 111 that performs various calculations related to the determination as to whether or not to continue the gain calibration, using data stored in the storage unit 106 or the like. The communication unit 112 controls communication with the control device 140. The power supply unit 114 supplies power to each unit in the radiation imaging device 100.

[0015] The control unit 102 may, for example, read out a program or the like stored in the storage unit 106 and control the entire radiation imaging apparatus 100 based on the read out program or the like. Alternatively, the control unit 102 may control the radiation imaging apparatus 100 by a control signal generating circuit such as an ASIC, or the entire control of the radiation imaging apparatus 100 may be realized by both a program and a control circuit.

[0016] The radiation generating device 130 controls the radiation source 131. The radiation source 131 is controlled by the radiation generating device 130 and irradiates the radiation imaging device 100 with radiation. The radiation generating device 130 has an operation UI 132 for operating the radiation generating device 130. The operation UI 132 includes a keyboard, a mouse, and the like. Using the operation UI 132, a user sets radiation irradiation conditions and irradiates radiation, for example.

[0017] The control device 140 includes an imaging device control unit 141, a communication unit 142, a radiation imaging application 143, a power supply unit 144, a display unit 145, and an operation UI 146. The imaging device control unit 141 controls the timing and conditions of image acquisition by the radiation imaging device 100. The communication unit 142 controls communication with the radiation imaging device 100 and the radiation generation device 130. The radiation imaging application 143 controls collection and display of captured images from the radiation imaging device 100, acceptance of imaging orders, registration of imaging information, and the like. The power supply unit 144 supplies power to each unit in the control device 140. The display unit 145 displays captured images and imaging information. The operation UI 146 is a user interface for operating the radiation imaging application. The operation UI 146 includes a keyboard, a mouse, and the like.

[0018] Here, the communication between the control device 140 and the radiation imaging apparatus 100 and the communication between the control device 140 and the radiation generating apparatus 130 may be cable connection communication using a standard such as RS232C, USB, or Ethernet (registered trademark). The communication between the control device 140 and the radiation imaging apparatus 100 and the communication between the control device 140 and the radiation generating apparatus 130 may be communication using a dedicated signal line or wireless communication. The communication between the control device 140 and the radiation imaging apparatus 100 and the communication between the control device 140 and the radiation generating apparatus 130 may be a combination of these. For example, control communication such as image data, image acquisition condition setting, and apparatus status acquisition is performed between the control device 140 and the radiation imaging apparatus 100.

[0019] 2 is a diagram showing an example of a hardware configuration of the control unit 102 of the radiation imaging apparatus 100. The control unit 102 has a CPU 201, a ROM 202, a RAM 203, a storage device 204, an input unit 205, a communication unit 206, and a bus 207. The CPU 201, the ROM 202, the RAM 203, the storage device 204, the input unit 205, and the communication unit 206 are connected to each other via the bus 207 so as to be able to communicate with each other.

[0020] A CPU (Central Processing Unit) 201 reads out a control program stored in a ROM (Read Only Memory) 202, executes various processes, and controls the entire radiation imaging apparatus 100. A RAM (Random Access Memory) 203 is used as a temporary storage area such as a main memory and a work area for the CPU 201. A storage device 204 is, for example, an HDD (Hard Disk Drive) or an SSD (Solid State Drive), and stores various data, various programs, etc. An input unit 205 receives input of radiation images and gain correction data obtained by imaging. A communication unit 206 performs communication processing with the control device 140.

[0021] For example, the CPU 201 reads out and executes a program stored in the ROM 202 or the storage device 204, thereby implementing the functions of the control unit 102 described above and the processes described below.

[0022] 3 is a flowchart showing an example of processing related to the gain calibration in this embodiment. An example of a determination to continue the gain calibration in this embodiment and a processing example after the determination will be described with reference to the flowchart shown in FIG.

[0023] In step S301, the gain correction data acquisition control unit 113 of the image acquisition unit 103 acquires gain correction data by performing gain calibration for all M conditions, for example, with different gain and binning conditions. The gain correction data acquisition control unit 113 acquires gain correction data by irradiating radiation in a state without a subject and capturing images for each of the M conditions with different gain and binning conditions.

[0024] In step S302, the gain correction data acquisition control unit 113 stores the gain correction data acquired in step S301 in the storage unit 106 as the gain correction data 108. In step S303, the control unit 102 starts imaging by irradiating radiation in a state where a subject is present. Note that starting imaging in step S303 is optional, and imaging does not necessarily have to be performed.

[0025] Thereafter, for example, when it is time for regular maintenance or when burn-in occurs, the gain correction data acquisition control unit 113 starts gain calibration in step S304. In step S305, the control unit 102 sets the value of a variable N to 1. Here, the variable N is a variable for indicating the N-th condition among the M conditions (total M conditions) of the gain calibration performed in step S301.

[0026] In step S306, the gain correction data acquisition control unit 113 acquires gain correction data by irradiating radiation and capturing an image in the absence of a subject under the Nth condition out of the total M conditions, and stores the data in the memory unit 106 as a radiation image 107.

[0027] In step S307, the gain correction data acquisition determination unit 109 acquires an average value or a step amount for pixel values ​​based on the gain correction data stored as the radiation image 107 in step S306. The average value is a value obtained by averaging the data of the radiation image 107 for each of the regions A to P obtained by dividing the image 401 vertically and horizontally into four regions as shown in Fig. 4. The step amount is a difference in average values ​​between adjacent regions in all or some of the vertical, horizontal, and diagonal directions for each of the regions A to P.

[0028] In step S308, the gain correction data acquisition judgment unit 109 judges whether the average value or step amount acquired in step S307 is within the specified value 110. For example, the specified value of the average value is within 10000±2000 LSB, and the specified value of the step amount is within 0±100 LSB. Note that this is just an example, and the specified values ​​can be set arbitrarily. The specified value of the step amount may also be a percentage of the average value.

[0029] If the average values ​​or step amounts are within the specified values, it is estimated that the radiation image 107 acquired in step S306 has few or no steps due to, for example, fluctuations over time or burn-in. Based on this, it is determined not to continue the gain calibration. Therefore, if the gain correction data acquisition determination unit 109 determines that all average values ​​or step amounts are within the specified values ​​110 (YES in step S308), the process proceeds to step S309.

[0030] On the other hand, if the average value or the step amount is not within the specified value, it is estimated that a step due to, for example, fluctuation over time or burn-in has occurred in the radiation image 107 acquired in step S306. Based on this, it is determined to continue the gain calibration. Therefore, if the gain correction data acquisition determination unit 109 determines that at least one average value or step amount is not within the specified value 110 (NO in step S308), the process proceeds to step S311 to perform gain calibration under the next condition.

[0031] In step S309, the gain correction data acquisition control unit 113 ends the gain calibration based on the determination result by the gain correction data acquisition determination unit 109, and the process proceeds to step S310. After the gain calibration is completed, radiation may be irradiated and imaging may be performed in a state where a subject is present to obtain a radiological image.

[0032] In step S310, the control unit 102 may exchange information with the control device 140 to notify an operator or the like, using the display unit 145, that the gain calibration has been completed.

[0033] In step S311, the control unit 102 determines whether the value of the variable N is M, that is, N=M. If the control unit 102 determines that N=M is ​​not true (NO in step S311), the process proceeds to step S312 to perform gain calibration (capturing gain correction data) for the next condition. If the control unit 102 determines that N=M (YES in step S311), the process proceeds to step S313 because gain calibration (capturing gain correction data) for all M conditions has been completed. In step S312, control unit 102 increments the value of variable N by 1, and then the process proceeds to step S306.

[0034] In step S313, since the gain correction data for all M conditions is stored in the storage unit 106 as the radiographic image 107, the gain correction data acquisition control unit 113 replaces the radiographic image 107 stored in the storage unit 106 with the gain correction data 108. In other words, when the gain calibration for all M conditions is completed, the gain correction data stored as the radiographic image 107 in the storage unit 106 is stored as the gain correction data 108. Thereafter, the process proceeds to step S309.

[0035] In the process shown in Fig. 3, a determination is made as to whether or not to continue the gain calibration based on a radiation image (gain correction data) acquired during the execution of the gain calibration under a plurality of conditions. Then, based on the result of this determination, the execution of the gain calibration under a plurality of conditions is controlled. In this manner, when the determination as to whether to continue the gain calibration is made and it is determined not to continue, the subsequent gain calibrations are not executed, thereby making it possible to prevent the execution of unnecessary gain calibrations from being continued. By not executing unnecessary gain calibrations, it is possible to reduce the time and man-hours required for the execution of the gain calibration.

[0036] 3, a determination as to whether to continue gain calibration is made based on an average value or a step amount obtained from the gain correction data stored as the radiographic image 107 in step S306. Alternatively, a determination as to whether to continue gain calibration may be made based on an average value or a step amount obtained from difference data between the gain correction data 108 stored in step S302 and the radiographic image 107 stored in step S306. An example of a process in which a determination as to whether to continue gain calibration is made by obtaining an average value or a step amount from difference data between the gain correction data 108 and the radiographic image 107 is shown in FIG.

[0037] In FIG. 5, the processes in steps S501 to S506 are similar to the processes in steps S301 to S306 shown in FIG. That is, in step S501, the gain correction data acquisition control unit 113 of the image acquisition unit 103 performs gain calibration for all M conditions having different gain and binning conditions, for example, to acquire gain correction data. In step S502, the gain correction data acquisition control unit 113 stores the gain correction data acquired in step S501 in the storage unit 106 as the gain correction data 108. In step S503, the control unit 102 starts imaging by irradiating radiation in a state where a subject is present.

[0038] In step S504, the gain correction data acquisition control unit 113 starts the gain calibration. In step S505, the control unit 102 sets the value of a variable N to 1. In step S506, the gain correction data acquisition control unit 113 acquires gain correction data in a state in which there is no subject under the N-th condition among all M conditions, and stores the data in the storage unit 106 as the radiation image 107.

[0039] In step S507, the gain correction data acquisition determination unit 109 acquires an average value or a step amount based on difference data between the gain correction data stored as the radiation image 107 in step S506 and the gain correction data 108 stored in step S502.

[0040] In step S508, the gain correction data acquisition judgment unit 109 judges whether the average value or step amount acquired in step S507 is within the specified value 110. For example, the specified value of the average value is within 0±2000 LSB, and the specified value of the step amount is within 0±50 LSB. Note that this is just an example, and the specified values ​​can be set arbitrarily. The specified value of the step amount may also be a percentage of the average value.

[0041] If the average value or step amount is within the specified value, it means that there has been little fluctuation in the average value or step amount since the gain correction data 108 was acquired in step S502. Therefore, it is estimated that the radiation image 107 acquired in step S506 has little or no step due to, for example, fluctuation over time or burn-in. Based on this, it is determined that the gain calibration should not be continued. Therefore, if the gain correction data acquisition determination unit 109 determines that all average values ​​or step amounts are within the specified value 110 (YES in step S508), the process proceeds to step S509.

[0042] If the average value or the step amount is not within the specified value, it is estimated that there has been a change in the average value or the step amount since the gain correction data 108 was acquired in step S502, and a step due to, for example, time-dependent variation or burn-in has occurred in the radiation image 107 acquired in step S306. Based on this, it is determined that the gain calibration should be continued. Therefore, if the gain correction data acquisition determination unit 109 determines that at least one average value or step amount is not within the specified value 110 (NO in step S508), the process proceeds to step S511 to perform gain calibration under the next condition.

[0043] The processing in steps S509 to S513 is similar to the processing in steps S309 to S313 shown in FIG. That is, in step S509, the gain correction data acquisition control unit 113 ends the gain calibration based on the determination result by the gain correction data acquisition determination unit 109. In step S510, the control unit 102 may exchange information with the control device 140 to notify an operator or the like using the display unit 145 that the gain calibration has been completed.

[0044] In step S511, the control unit 102 determines whether the value of the variable N is M, that is, whether N=M. If the control unit 102 determines that N=M is ​​not true (NO in step S511), the process proceeds to step S512. If the control unit 102 determines that N=M is ​​true (YES in step S511), the process proceeds to step S513. In step S512, the control unit 102 increments the value of the variable N by 1, and then the process proceeds to step S506.

[0045] In step S513, the gain correction data acquisition control unit 113 replaces the gain correction data 108 stored in the storage unit 106, and stores the gain correction data stored in the storage unit 106 as the radiation image 107 as the gain correction data 108. Thereafter, the process proceeds to step S509.

[0046] 5, a determination is made as to whether or not to continue the gain calibration, and if it is determined that the gain calibration should not be continued, the subsequent gain calibration is not performed, thereby preventing the unnecessary gain calibration from being continued. By not performing the unnecessary gain calibration, the time and labor required to perform the gain calibration can be reduced. Furthermore, in step S507, the accuracy of the determination as to whether or not to continue the gain calibration can be improved by making a determination based on difference data between the radiation image 107 stored in step S506 and the gain correction data 108 stored in step S502.

[0047] According to the present embodiment, when it is determined that the gain calibration does not need to be continued, the subsequent gain calibration is not performed, thereby preventing the unnecessary gain calibration from being continued. By not performing the unnecessary gain calibration, the time and man-hours required for performing the gain calibration can be reduced.

[0048] In addition, in the above-mentioned steps S310 and S510, the operator or the like may be notified as to whether or not the gain correction data 108 stored in the storage unit 106 has been replaced. That is, in the gain calibration for notifying the end, the operator or the like may be notified as to whether or not the gain correction data has been stored in the storage unit 106.

[0049] In addition, in the above-mentioned steps S306 and S506, an example was shown in which the image is divided into four parts vertically and horizontally, but the number of divisions is not limited to four and can be any number, and the number of divisions in the vertical and horizontal directions may be different.

[0050] In the above example, whether to continue the gain calibration being performed is determined based on the acquired average value or step amount, but whether to continue the gain calibration may be determined based on both the acquired average value and step amount. By making a decision to continue the gain calibration based on both the acquired average value and step amount, the accuracy of the decision to continue can be improved.

[0051] (Another embodiment of the present invention) The present invention can also be realized by a process in which a program for implementing one or more of the functions of the above-described embodiment is supplied to a system or device via a network or a storage medium, and one or more processors in a computer of the system or device read and execute the program. The present invention can also be realized by a circuit (e.g., ASIC) for implementing one or more of the functions.

[0052] It should be noted that the above-mentioned embodiments are merely examples of the implementation of the present invention, and the technical scope of the present invention should not be interpreted as being limited by these. In other words, the present invention can be implemented in various forms without departing from its technical concept or main features.

[0053] The disclosure of the present embodiment includes the following configurations, methods, etc. (Configuration 1) an acquisition means for acquiring a radiographic image based on incident radiation; a gain correction means for correcting the radiographic image using gain correction data acquired by performing gain calibration; and a control unit that controls continuation of the gain calibration based on the radiation images acquired during the execution of the gain calibration under a plurality of conditions. (Configuration 2) 2. The radiation imaging apparatus according to configuration 1, wherein the control means comprises a determination means for determining whether or not to continue the execution of the gain calibration based on the radiation image. (Configuration 3) The radiation imaging device according to configuration 2, characterized in that the determination means determines whether or not to continue the gain calibration based on at least one of an average value obtained for each of a plurality of regions obtained by dividing the radiation image based on pixel values ​​of the radiation image and a difference between the average values ​​between adjacent regions. (Configuration 4) The radiation imaging apparatus according to configuration 3, wherein the average value is obtained from pixel values ​​of the radiation image acquired during execution of the gain calibration. (Configuration 5) A storage means for storing gain correction data, The radiation imaging apparatus according to configuration 3, wherein the average value is obtained from difference data between the radiation image acquired during the gain calibration and the gain correction data stored in the storage means. (Configuration 6) 6. The radiation imaging apparatus according to any one of configurations 3 to 5, wherein the determination means determines not to continue the gain calibration if the average value and the difference between the average values ​​are within a specified value. (Configuration 7) 7. The radiation imaging device according to any one of configurations 1 to 6, characterized in that when the gain calibration under a plurality of conditions is completed, the gain correction data is replaced with the radiation image acquired during the gain calibration. (Configuration 8) 8. The radiation imaging apparatus according to any one of configurations 1 to 7, wherein, when the gain calibration is completed, a notification of the completion of the gain calibration is given. (System 1) A radiation generating device that generates radiation; 9. A radiation imaging system comprising: the radiation imaging apparatus according to any one of configurations 1 to 8, communicatively connected to the radiation generating apparatus. (Method 1) an acquisition step of acquiring a radiographic image based on the incident radiation; a gain correction step of correcting the radiographic image using gain correction data acquired by performing gain calibration; and a control step of controlling continuation of the gain calibration based on the radiation images acquired during the execution of the gain calibration under a plurality of conditions. (Program 1) The computer of the radiation imaging device An acquisition step of acquiring a radiographic image based on the incident radiation; a gain correction step of correcting the radiographic image using gain correction data acquired by performing gain calibration; and a control step of controlling continuation of the gain calibration based on the radiation images acquired during the execution of the gain calibration under a plurality of conditions. [Explanation of symbols]

[0054] 100: Radiation imaging device 101: Radiation detection section 102: Control section 103: Image acquisition section 104: Image processing section 105: Gain correction section 106: Storage section 107: Radiation image 108: Gain correction data 109: Gain correction data acquisition determination section 110: Specified value 111: Calculation section 112: Communication section 113: Gain correction data acquisition control section

Claims

1. an acquisition means for acquiring a radiographic image based on incident radiation; a gain correction means for correcting the radiographic image using gain correction data acquired by performing gain calibration; and a control unit that controls continuation of the gain calibration based on the radiation images acquired during the execution of the gain calibration under a plurality of conditions.

2. 2. The radiation imaging apparatus according to claim 1, wherein the control means comprises a determination means for determining whether or not to continue the execution of the gain calibration based on the radiation image.

3. 3. The radiation imaging device according to claim 2, wherein the determination means determines whether or not to continue the gain calibration based on at least one of an average value obtained for each of a plurality of regions obtained by dividing the radiation image based on pixel values ​​of the radiation image and a difference between the average values ​​between adjacent regions.

4. The radiation imaging apparatus according to claim 3 , wherein the average value is obtained from pixel values ​​of the radiation image acquired during the execution of the gain calibration.

5. A storage means for storing gain correction data, 4. The radiation imaging apparatus according to claim 3, wherein the average value is obtained from difference data between the radiation image acquired during the gain calibration and the gain correction data stored in the storage means.

6. 4. The radiation imaging apparatus according to claim 3, wherein the determining unit determines not to continue the execution of the gain calibration if the average value and the difference between the average values ​​are within a specified value.

7. 2 . The radiation imaging apparatus according to claim 1 , wherein, when the gain calibration under a plurality of conditions is completed, the gain correction data is replaced with the radiation image acquired during the gain calibration.

8. 2. The radiation imaging apparatus according to claim 1, wherein, when the gain calibration is completed, a notification of the completion of the gain calibration is issued.

9. A radiation generating device that generates radiation; A radiation imaging system comprising: the radiation imaging apparatus according to claim 1 , communicably connected to the radiation generating apparatus.

10. an acquisition step of acquiring a radiographic image based on the incident radiation; a gain correction step of correcting the radiographic image using gain correction data acquired by performing gain calibration; and a control step of controlling continuation of the gain calibration based on the radiation images acquired during the execution of the gain calibration under a plurality of conditions.

11. The computer of the radiation imaging device An acquisition step of acquiring a radiographic image based on the incident radiation; a gain correction step of correcting the radiographic image using gain correction data acquired by performing gain calibration; and a control step of controlling continuation of the gain calibration based on the radiation images acquired during the execution of the gain calibration under a plurality of conditions.

Images