Radiation imaging apparatus

Abstract

To appropriately perform correction when bright burn occurs in detection means.SOLUTION: A radiation imaging apparatus has: acquisition means that acquires a radiation image photographed by detection means that detects incident radiation, and gain correction data; and gain correction means that corrects the radiation image by using the gain correction data. When bright burn in the detection means occurs, the gain correction means corrects the radiation image by using the gain correction data acquired by executing gain calibration after the occurrence of the bright burn.SELECTED DRAWING: Figure 9A

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 Regarding grams. [Background technology]

[0002] As an imaging device used for X-ray medical imaging diagnosis and non-destructive testing, A flat panel detector formed of a suction device and a semiconductor material. Radiation imaging devices using flat panel display (FPD) have become widespread. For example, in non-destructive testing, radiation imaging devices destroy objects such as printed circuit boards and pipes. It can be used to inspect for internal or surface damage or deterioration without the need for inspection.

[0003] However, when a thick object such as a pipe is used, the scintillator is exposed to a large amount of X-rays. The sensitivity characteristics of the scintillator change in response to radiation exposure. This phenomenon is also called "bright burn". The image on the FPD may show artifacts or residual images of the object, but it takes time for the image to return to normal. Since this takes time, a correction method for removing burn-in is known.

[0004] As a correction method to remove image sticking, remove the subject and take a white picture (hereinafter referred to as gain calibration). After updating the gain compensation data, the updated gain compensation data is used when taking a picture. There is technology to perform gain correction using data.

[0005] On the other hand, there is a phenomenon called afterimage, where the light emitted by the scintillator does not stop even after the X-ray irradiation is stopped. Some are caused by afterglow due to light left behind by a source of light, or by residual light transfer from the image sensor. These are called FPN (Fixed Pattern Noise) afterimages, and The aforementioned gain calibration is also an effective measure against N-image retention.

[0006] However, this gain calibration itself is a time-consuming task, so There is a demand to keep this to a minimum.

[0007] In Patent Document 1, gain calibration was performed in advance as a countermeasure against FPN afterimages. The FPN image was taken without X-ray irradiation at the time of the subject's exposure (hereafter referred to as FPN image), and the FPN image was taken just before the subject was photographed. A technology has been disclosed that determines the occurrence of FPN afterimages from images and takes appropriate measures.

[0008] Patent Document 2 describes a burn-in image captured this time, a burn-in correction image just before, and a comparison of the burn-in correction image and the burn-in correction image. A correction method is disclosed that uses an image in which parameters are calculated from an additional information image. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Patent No. 4468083 [Patent Document 2] JP 2003-185752 A Summary of the Invention [Problem to be solved by the invention]

[0010] To determine the presence or absence of burn-in from an image taken under X-ray irradiation, for example, After this, the object is moved and another image is taken by irradiating it with X-rays. This requires the time and effort of determining whether burn-in is present or not, which leads to a decrease in inspection throughput. In the case of piping inspection, the work of moving the subject may be done manually, so the work This will force additional work on the user.

[0011] An object of the present disclosure is to enable appropriate correction when burn-in occurs in a detection means. [Means for solving the problem]

[0012] The radiation imaging device has an acquisition means for acquiring a radiation image and gain correction data captured by a detection means for detecting incident radiation, and a gain correction means for correcting the radiation image using the gain correction data, and when burn-in occurs in the detection means, the gain correction means corrects the radiation image using the gain correction data acquired by performing gain calibration after the occurrence of burn-in. Effect of the Invention

[0013] According to the present disclosure, when burn-in occurs in a detection unit, it can be appropriately corrected. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a diagram illustrating an example of the configuration of a radiation imaging system. [Diagram 2] FIG. 1 is a diagram illustrating an example of the configuration of a radiation inspection system for non-destructive inspection. [Diagram 3] 10 is a flowchart showing a control method of the radiation imaging system. [Figure 4] FIG. 13 is a diagram showing an example of an FPN image immediately after imaging when burn-in occurs. [Diagram 5] FIG. 13 is a diagram showing an example of an in-plane pixel distribution in the X-axis direction. [Figure 6] FIG. 1 is a diagram illustrating an example of the configuration of a radiation imaging system. [Figure 7]2 is a diagram illustrating an example of the hardware configuration of a control unit in the radiation imaging apparatus. [Figure 8] FIG. 2 is a diagram illustrating an example of the configuration of an inspection device. [Figure 9A] 11 is a flowchart illustrating an example of a process of updating and switching gain correction data. [Figure 9B] 11 is a flowchart illustrating an example of a process of updating and switching gain correction data. [Figure 9C] 11 is a flowchart illustrating an example of a process of updating and switching gain correction data. [Figure 9D] 11 is a flowchart illustrating an example of a process of updating and switching gain correction data. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, the embodiments will be described with reference to the drawings. The embodiments do not limit the scope of the claims and are not intended to limit the combination of features described in the embodiments. Not all of the combinations are necessarily essential as a solution. In the above, the radiation is preferably X-rays, but is not limited thereto. The radiation may be X-rays, β-rays, γ-rays, or other radiations. Radiation is not limited to, for example, alpha rays, beta rays, gamma rays, particle rays, cosmic rays, etc. It is assumed that.

[0016] (First embodiment) FIG. 1 is a diagram showing an example of the arrangement of a radiation imaging system 120 according to the first embodiment. The radiation imaging system 120 includes a radiation imaging device 100, a radiation source 301, and a radiation generating device. A radiation generating device 300, a radiation generating device operation UI 302, a display unit 405, and a control device operation UI 40 6 and a control device 400.

[0017] The radiation source 301 emits radiation. The radiation generating device 300 controls the radiation source 301. The control device 400 controls the radiation imaging device 100 and the radiation generating device 300. A radiation imaging application capable of collecting and displaying radiation images from the radiation imaging device 100. It has option 403.

[0018] The radiation imaging apparatus 100 includes a radiation detection unit 200, a control unit 101, and a power supply unit 113. The radiation detection unit 200 detects radiation and generates image data. The control unit 101 The radiation detection unit 200 is a two-dimensionally distributed image sensor and a scintillator. The scintillator converts radiation that reaches the radiation detection unit 200 into light. The image sensor has a photoelectric conversion element that converts the light converted by the scintillator into an electric charge. The radiation detection unit 200 generates two-dimensional radiation image data. Here, we take a scintillator as an example. emits light in proportion to the intensity of the radiation it receives, and the image sensor emits light in proportion to the intensity of the scintillator. The higher pixel value is output.

[0019] The control unit 101 includes a radiation image acquisition unit 102, an image processing unit 103, a storage unit 106, The image acquisition unit 102 includes a burn-in estimation unit 111 and a communication unit 112. A radiation image is acquired from the output unit 200 .

[0020] The radiation image acquisition unit 102 reads out the electric charges from each image pickup element of the radiation detection unit 200 and When the readout of charges from all the imaging elements is completed, acquisition of the radiation image is completed. After completing the acquisition of the radiation image, the radiation image acquisition unit 102 accumulates the radiation image in each image sensor of the radiation detection unit 200. A reset operation is performed to read and discard the accumulated charge. The radiation image 107 acquired from the unit 200 is stored in the storage unit 106 .

[0021] The image processing unit 103 performs offset correction on the radiation image 107 stored in the storage unit 106. The offset correction unit 104 performs offset correction, and the gain correction unit 105 performs gain correction. However, the image processing unit 103 may have a correction unit that performs correction processing other than these. In addition, the offset correction unit 104 may execute a process for generating offset correction data 108. Furthermore, the gain correction unit 105 may perform a process of generating gain correction data 109.

[0022] The storage unit 106 stores the radiation image 107 acquired by the radiation image acquisition unit 102 and the radiation The offset correction data 108 used when performing offset correction on the line image 107 is stored. Here, the offset correction data 108 is an image generated in advance before the image capture is performed. In addition, in the radiation imaging of each frame, the radiation image acquisition unit 102 may The image acquired under the illumination may be used as the offset correction data 108. The correct data 108 is not limited to one, and may include, for example, the image size at the time of shooting and the radiation accumulation time. Alternatively, the information may be stored for each

[0023] Furthermore, the memory unit 106 stores the gain correction data 109 generated in advance by the gain correction unit 105. The gain correction data 109 is not limited to one. For example, the gain correction data 109 may be stored in the memory. The storage unit 106 may store the radiation image data for each image size. The acquisition unit 102 acquires an FPN image immediately after radiation imaging, which is an image captured under non-irradiation conditions immediately after radiation imaging. The image 110 is stored. FPN stands for Fixed Pattern Noise. oise).

[0024] The burn-in estimation unit 111 estimates the burn-in intensity based on an FPN image 110 acquired immediately after radiation imaging. Then, it is estimated whether burn-in has occurred in the scintillator during the immediately preceding radiation imaging. The sensitivity characteristics of the detector change in response to radiation exposure, and the radiation is reflected as an afterimage. Afterglow occurs when the scintillator continues to emit light even after the radiation is stopped, and imaging This phenomenon is called burn-in (blackout). This phenomenon causes artifacts or A residual image of the subject remains, but it takes time for the image to return to normal, so a correction to remove the burn-in is required. The residual image will decrease over time.

[0025] The control device 400 includes a communication control unit 401, a radiation imaging device control unit 402, and a radiation imaging device control unit 403. The radiation generating device includes an application 403, a radiation generating device control unit 404, and a power source 407. The control unit 401 controls communication between the control device 400 and the radiation imaging device 100 and the control device 400. The radiation imaging device control unit 402 controls communication between the radiation imaging device 300 and the radiation generation device 300. It controls the image acquisition timing and conditions of the radiological imaging device 100. The terminal 403 collects and displays radiation images from the radiation imaging device 100. The radiation generating device control unit 404 controls the radiation irradiation conditions of the radiation generating device 300. cormorant.

[0026] The display unit 405 displays a radiation image and imaging information. The UI is a keyboard and a mouse, for example, for operating the control device 400. The radiation generating device operation UI 302 is, for example, a keyboard and a mouse. This is the UI for operating the 300.

[0027] Between the control device 400 and the radiation imaging device 100, and between the control device 400 and the radiation generating device The information is transmitted between the device 300 and the communication line, a dedicated signal line, and / or wireless communication. The communication line can be, for example, RS232C, USB, or local area network. The cable is based on a standard such as a wireless network. Between 100, for example, image data, image acquisition condition setting, device status acquisition, and other control communications are performed. In addition, between the control device 400 and the radiation generating device 300, for example, the radiation irradiation conditions are It performs control communication such as setting conditions, acquiring device status, and actual irradiation information.

[0028] FIG. 2 is a diagram showing a configuration example of a radiation inspection system for non-destructive inspection. The system includes a radiation imaging system 120 shown in FIG. A station 300, a conveyor belt 203, a subject 202, a radiation detection unit 200, and a display unit The radiation generating device 300 irradiates radiation 201. The subject 202 has The radiation is conveyed on a conveyor belt 203. The radiation detection unit 200 converts the incident radiation into an electrical signal. The display unit 405 displays the radiation image and the imaging information. .

[0029] When photographing another subject after photographing the subject 202, the conveyor belt 203 is Then, the subject 202 is moved and imaging is performed for a different subject. Burn-in on the radiation image When the phenomenon occurs, the conveyor belt 203 is operated to move the object 202 and radiate the radiation. When the subject 202 is not present on the trajectory of the line 201, the radiation generating device 300 emits radiation 2 01 and perform gain calibration. If there is an examination in which you do not want to perform gain calibration when a marking phenomenon occurs Alternatively, the gain calibration function may be turned off in the settings of the radiation generating device 300. can.

[0030] FIG. 3 is a flowchart showing a method for controlling the radiation imaging system 120. The storage unit 106 stores the offset correction data 108 and the gain correction data 109 in advance. Therefore, if the storage unit 106 holds the offset correction data 108, If not, the operator first operates the control device 400 to set the offset. Similarly, if the memory unit 106 stores the gain correction data 109, If the operator does not have the device, he / she operates the control device 400 to The image processing unit 100 performs image correction data generation processing.

[0031] Although not shown, before step S301, the operator may operate the control device operation UI 406, the examination subject is set, the imaging method is selected, etc. 2 is a control signal for the radiation imaging device (for example, a pre-set frame rate) based on the selection by the operator. Then, the communication control unit 401 generates a shooting mode number that determines the shooting speed and image size. sends a radiation imaging apparatus control signal to the communication unit 112 of the radiation imaging apparatus 100 .

[0032] The control unit 101 receives a radiation imaging apparatus control signal from the communication unit 112 and controls the radiation imaging apparatus The radiation detector 200 is driven at a period corresponding to the frame rate of the control signal. The image acquisition unit 102 is controlled by the radiation image acquisition unit 102. Perform reset operation 02.

[0033] The radiation generating device 300 is ready to irradiate radiation and the radiation imaging device 100 is ready to detect radiation. After completion of the process, the operator presses the switch of the radiation generator operation UI 302 to start the radiation generation. Under the control of the radiation generating device 300, the radiation source 301 starts irradiating radiation.

[0034] In step S301, the radiation image acquisition unit 102 detects radiation emitted from the radiation source 301. In the radiation-irradiated state (radiation-irradiated state), a radiation image generated by the radiation detection unit 200 is The radiation image is acquired by reading out the electric charges of each image sensor of the radiation detection unit 200. The image is generated when the object is present. The obtained radiation image is stored as a radiation image 107 in the storage unit 106 .

[0035] Thereafter, the control unit 101 controls the offset correction unit 104 and the gain correction unit 105 of the image processing unit 103 to 105 to perform offset correction and gain correction on the radiation image 107. At this time, the offset correction unit 104 receives the correction data stored in advance in the storage unit 106. Using the offset correction data 108, offset correction is performed on the radiation image 107. The gain correction unit 105 uses the gain that is stored in advance in the storage unit 106 as correction data. Using the correction data 109, gain correction is performed on the radiation image 107. After performing image processing on image data 07, the control unit 101 controls the communication unit 112 to perform image processing. The radiographic image 107 thus obtained is transferred to the communication control unit 401 .

[0036] In step S302, the control unit 101 in the radiation imaging apparatus 100 determines whether to continue imaging. At this time, the control unit 101 checks, for example, the communication unit 112 and determines whether the control device 40 0, the radiography stop request communication from the radiation imaging device control unit 402 is confirmed. If there is no communication requesting to stop shooting, the control unit 101 determines to continue shooting. If there is a communication requesting to stop shooting, it is determined that shooting should not be continued. If so, the process proceeds to step S303. If it is determined that shooting should be continued, the process Return to step S301.

[0037] In step S301, the radiation image acquisition unit 102 controls the radiation detection unit 200 to The radiation detection unit 20 detects the next frame of a radiation image based on radiation irradiated from the radiation source 301. The radiographic image acquisition unit 102 then acquires the electric charge of each of the image pickup elements 100 and 102. The acquired radiation image is stored in the storage unit 106 as a radiation image 107. The control unit 101 again performs image processing on the radiation image 107, and outputs the processed radiation image 107 as a The line image 107 is transferred to the communication control unit 401. After that, the control unit 101 again performs step S In step 302, it is determined whether or not to continue imaging. , a plurality of frames of radiation images 107 are acquired.

[0038] In step S303, the communication unit 112 in the radiation imaging device 100 This means that the radiography stop request communication has been received from the radiation imaging device control unit 402. The radiation imaging application 403 then requests the radiation generating device 300 to stop emitting radiation. This means that the radiation source 301 is not emitting radiation. do.

[0039] In a state where radiation is not being irradiated (non-irradiation state), the radiation image acquisition unit 102 The radiation detection unit 200 is controlled to detect radiation before starting a reset operation of the radiation detection unit 200. The image generated by the line detection unit 200 is acquired. This image is obtained when no radiation is irradiated. The control unit 101 controls the FPN image immediately after capturing the image. The image is stored in the storage unit 106 as a PN image 110 .

[0040] When acquiring the FPN image 110 immediately after imaging, the radiation image acquisition unit 102 performs step S30 The radiation detection unit 200 is controlled under the same operating conditions as when the imaging was performed in 1, and the FP Alternatively, the radiation image acquisition unit 102 acquires N images 110 in step S301. The radiation detection unit 200 is controlled under different operating conditions from when the above was performed, and the FPN image is taken immediately after imaging. An image 110 may be acquired.

[0041] The sooner the FPN image 110 is captured after the shooting, the Therefore, the presence or absence of burn-in can be estimated with high accuracy in the burn-in estimation in step S304 described later. Therefore, as an example of changing the operating conditions when acquiring the FPN image 110 immediately after imaging, for example, The frame rate can be increased. Then, the radiation image acquisition section 102 starts a reset operation of the radiation detection section 200.

[0042] As described above, the reset operation of the radiation detection unit 200 is performed in the step S301. No processing is performed between the acquisition of 107 and the acquisition of the FPN image 110 immediately after imaging in step S303. , immediately after imaging, after acquisition of the FPN image 110.

[0043] In addition, in order to generate the FPN image 110 immediately after imaging by the radiation detection unit 200 in step S303, The operating conditions for generating the radiation image 107 of the radiation detection unit 200 in step S301 are as follows: The operating conditions are the same as those for the first embodiment. The frame rate for generating the PN image 110 is set by the radiation detection unit 20 in step S301. The frame rate may be faster than the frame rate for generating the radiation image 107 of 0.

[0044] The FPN image 110 obtained immediately after capture here is, as shown in FIG. Immediately after the image, the FPN image 110 shows a blank area 411 where no object was present, and a residual area where the object was present. The image has residual image regions 412 distributed therein. The control unit 101 stores the FPN image 110 immediately after imaging in the storage unit 106. After saving, the process proceeds to step S304.

[0045] In step S304, the burn-in estimation unit 111 performs Based on the immediate FPN image 110, the presence or absence of burn-in of the scintillator of the radiation detection unit 200 is estimated. Here, first, the burn-in estimation unit 111 estimates the in-plane image of the FPN image 110 immediately after capture. As a method for calculating the in-plane pixel distribution, for example, as shown in Figure 4, The FPN image 110 is scanned along the horizontal scan lines 413 by vertical rows 414. The in-plane pixel distribution is calculated.

[0046] Here, in a horizontal axis scanning line 415 having a blank area 411 and a residual image area 412, When calculating the pixel distribution of the horizontal axis scanning line 415, as shown in FIG. 5, the pixel distribution is divided into a blank area 411 and a residual area 412. The pixel values ​​fluctuate greatly between the image area 412 and the FPN image 11 immediately after capture. In the in-plane pixel distribution of 0, if there is an area where the pixel value fluctuation value is equal to or greater than a specific threshold value, The burn-in estimation unit 111 detects the image captured by the radiation detection unit 200 in the immediately preceding step S301. In this case, the process proceeds to step S305. In addition, the burn-in estimation unit 111 determines whether the image is a pixel distribution in the FPN image 110 immediately after capture. If there is no area in which the fluctuation value of the pixel value is equal to or greater than the specific threshold, the radiation detection unit 200 It is estimated that there is no burn-in of the scintillator, and the process proceeds to step S306.

[0047] As described above, the burn-in estimation unit 111 detects whether the difference in pixel values ​​in the FPN image 110 immediately after capture is equal to or smaller than the threshold value. If the above is true, it is assumed that the scintillator has burned in, and the FPN image 110 immediately after imaging is If the difference in pixel values ​​in is not greater than the threshold, it is assumed that there is no scintillator burn-in. If it is estimated that the scintillator is burned in, the process proceeds to step S305. If it is estimated that there is no burn-in of the scintillator, the process proceeds to step S306. .

[0048] In step S305, the radiation image acquisition unit 102 controls the radiation detection unit 200 to perform the following: The gain calibration is performed as follows. In the radiation irradiation setting, the radiation generating device 300 controls the radiation irradiation of the radiation source 301. The radiation image acquisition unit 102 detects the radiation detection unit 200 when there is no subject and radiation is being applied. Then, the gain correction unit 105 obtains a plurality of radiation-exposed images generated by the above. Gain correction data is generated based on the average image of the multiple radiation exposure images obtained. The gain correction data is updated as the gain correction data 109 in the storage unit 106. Then, The process proceeds to step S306.

[0049] In step S306, the control unit 101 in the radiation imaging apparatus 100 performs At this time, the control unit 101 checks the communication unit 112, for example. In response to a request to start imaging of another subject from the radiation imaging device control unit 402 in the control device 400, The control unit 101 performs the above determination by checking whether or not there is a request for communication for another subject. If there is a shooting start request communication for a different object, it is determined that shooting of a different object is to be performed, and If there is no communication requesting the start of photography for the subject, it is determined that photography for another subject will not be performed. do.

[0050] If it is determined that another object is to be photographed, the process returns to step S301. The radiation image acquisition unit 102 again performs the operation of reading out the electric charges of each image pickup element of the radiation detection unit 200. If it is determined that imaging of another subject is not to be performed, Then, the processing of the flowchart in FIG. 3 ends.

[0051] As described above, according to this embodiment, the radiation imaging system 120 can detect the sympathetic nervous system by irradiating a large amount of radiation. When burn-in occurs in the sensor, the occurrence of burn-in is estimated and the correction data is updated. The radiation image is corrected using the correction data. The 20 enables users to continue shooting while reducing the effects of burn-in.

[0052] The offset correction data 108 and the immediately-captured FPN image 110 can be a single image. Alternatively, an average image of multiple images may be used.

[0053] In step S304, the burn-in estimation unit 111 performs the following operation based on the FPN image 110 immediately after capture: When estimating the presence or absence of burn-in, the burn-in estimation unit 111 performs the following on the FPN image 110 immediately after capture: It is also possible to perform image processing and estimate the presence or absence of burn-in based on the image after image processing. For example, The burn-in estimation unit 111 controls the offset correction unit 104 to obtain the FPN image 11 immediately after capture. 0, offset correction is performed using the offset correction data 108, and the corrected image is In this way, the control unit 101 can estimate the presence or absence of burn-in based on the Since an image with reduced noise components can be generated from the PN image 110, burn-in estimation can be performed. Improved accuracy.

[0054] In addition, when performing gain calibration in step S305, the control unit 101 and controlling the communication unit 112 to transmit a burn-in occurrence notification signal to the control device 400. The communication unit 112 may function as a notification unit, and may notify the user of the occurrence of burn-in. The control device 400 is notified of the occurrence of burn-in. After the control unit 401 receives the burn-in occurrence notification signal, the radiation imaging application 403 An alert screen for the occurrence of a lock is displayed on the display unit 405.

[0055] At this time, the radiation imaging application 403 executes gain calibration. Alternatively, a selection screen for whether or not to perform the process may be displayed on the display unit 405, allowing the user to select. At this time, the user operates the control device operation UI 406 to perform gain calibration. The radiation imaging application 403 transmits the result of the selection to the radiation imaging device. The control unit 101 of the radiation imaging device 100 transmits the signal to the communication unit 112 of the radiation imaging device 100. The unit 112 checks the received selection result, and if the gain calibration execution instruction is selected, If so, perform gain calibration in step S305, and then Proceed to S306. If it is selected not to perform gain calibration, The control unit 101 does not perform the gain calibration and proceeds to step S306. That's fine.

[0056] In this example, a burn-in notification signal was used as a means of notifying the user. The radiation imaging apparatus 100 may use a notification UI (e.g., an LED or a buzzer, not shown) to notify the user. In addition, the radiation imaging application 403 displays an alert screen informing the user of the occurrence of burn-in. Instead of displaying the information on the display unit 405, the information is output by voice using a voice output unit (not shown) of the control device 400. Notification may also be given by telephone.

[0057] As described above, according to this embodiment, the burn-in estimation unit 111 estimates the image quality based on the FPN image 110 immediately after capture. In addition, it estimates whether or not the scintillator is burned in due to exposure to a large amount of radiation. 05 updates the gain correction data 109 only if there is burn-in, and This allows the image to be captured while reducing the effects of image burn-in. You may continue.

[0058] Second embodiment In the first embodiment, during inspection, the offset value that is generated in advance before shooting for each frame is used. In the second embodiment, the offset correction is performed using the offset correction data 108. 101 generates offset correction data 108 for each frame and performs offset correction. In this case, the control unit 101 controls the control unit 102 to control the generated signal generated by the radiation detection unit 200 in the radiation irradiation state. One frame of a radiation image is acquired, and the radiation image is stored in the storage unit 106 as a radiation image 107. After that, the control unit 101 controls the radiation detection unit 200 to detect the radiation intensity in a non-irradiation state. The image of one frame generated by the offset correction is acquired, and the image is stored in the storage unit 106 as offset correction data. After that, the control unit 101 stores the offset correction data 108 of the image processing unit 103. The offset correction unit 104 controls the frame rate of the offset correction data 108. Based on the frame, offset correction is performed on the frame of the radiation image 107.

[0059] In this case, when it is determined in step S302 that the image capturing is to be continued, the control unit 101 The acquisition of the radiographic image 107 and the acquisition of the offset correction data 108 are repeated multiple times. If it is determined in S302 that shooting is not to be continued, step S303 is not performed and step Alternatively, the process may proceed to step S304.

[0060] In step S304, the radiation image acquisition unit 102 executes a reset operation of the radiation detection unit 200. The reset operation of the radiation detection unit 200 is performed after the acquisition of the radiation image 107. The offset correction data 108 is not acquired multiple times, and the offset correction data The burn-in estimation unit 111 performs the burn-in estimation after the acquisition of the final frame of the image data 108. Instead of the PN image 110, the offset correction data 108 acquired in the final frame Based on this, the presence or absence of burn-in is estimated. Since the time lapse from the end of shooting is shorter in the FPN image, the area 411 in Fig. 5 is The pixel value variation between the image retention area 412 and the residual image area 413 becomes larger, and the accuracy of the burn-in estimation is improved. do.

[0061] In this case, in step S304, the burn-in estimation unit 111 calculates the offset correction data 1 When estimating burn-in based on the offset correction data 1008, the burn-in estimation unit 111 8, image processing may be performed, and the presence or absence of burn-in may be estimated based on the image after image processing. .

[0062] For example, although not shown, the radiation image acquisition unit 102 may perform a prediction before step S301. In order to do this, an image generated by the radiation detection unit 200 in a non-irradiated state is acquired, and the image is The offset correction data before shooting is stored in the storage unit 106. The data is not offset correction data immediately after shooting, so there is no burn-in. In step S304, the burn-in estimation unit 111 controls the offset correction unit 104. The set correction unit 104 stores the offset correction data 108 in the memory unit 1 The offset correction data before shooting stored in 06 is subtracted to perform the offset correction. Then, the burn-in estimation unit 111 estimates the burn-in based on the image after the offset correction. The pre-imaging offset correction data is the pre-imaging FPN image. Similarly to the offset correction data 108 in the first embodiment, the offset correction data 108 is obtained without irradiation of radiation. It may be a single image or an average image of multiple images.

[0063] This process can also be applied to the first embodiment. Based on an image obtained by subtracting the above pre-photographing offset correction data from the FPN image 110, Next, we estimate whether or not the scintillator has burned in.

[0064] (Third embodiment) In the method disclosed in Patent Document 2, imaging is performed by irradiating a large amount of radiation, as in non-destructive testing. When the raw value becomes saturated, it is not possible to correctly estimate the amount of burn-in from the image. If the gain of the flat panel detector is not corrected, image artifacts due to burn-in or It may not be possible to remove the residual image of the photograph immediately.

[0065] The third embodiment is a method for performing accurate gain correction even if burn-in occurs in a radiation imaging apparatus. According to the third embodiment, the radiation imaging apparatus Even if burn-in occurs, accurate gain correction can be performed.

[0066] 6 is a diagram showing an example of the arrangement of a radiation imaging system according to the third embodiment. The imaging system includes a radiation imaging device 600 having a radiation detection unit 601 and a A radiation generating device 630 for controlling a radiation source 631, a radiation imaging device 600 and a radiation generating and a control device 640 for controlling the video device 630.

[0067] The radiation imaging device 600 includes a radiation detection unit 601, a control unit 602, and a power supply unit 617. The radiation detection unit 601 detects incident radiation and outputs a signal in accordance with the amount of radiation detected. The radiation detection unit 601 converts incident radiation into light (e.g., ferromagnetic material) and generates image data. The scintillator (phosphor) converts the light generated by the scintillator into an electrical signal. A plurality of pixels each having a conversion element including a photoelectric conversion element that converts light into electricity are arranged in a two-dimensional array. It is distributed.

[0068] The control unit 602 controls the imaging and communication operations in the radiation imaging device 600. 02 includes an image acquisition unit 603, an image processing unit 604, a first storage unit 606, a second storage unit 607, and a 9, a switching processing unit 612, a switching time estimation unit 613, a communication unit 614, and an internal clock 615. do.

[0069] The image acquisition unit 603 acquires radiation image data corresponding to the irradiation of radiation from the radiation detection unit 601. The image acquisition unit 603 acquires image data including gain correction data from the radiation detection unit 601. The image processing unit 604 includes a gain correction data acquisition unit 616 for acquiring the normal data. The image processing unit 604 performs image processing on the image acquired from the line detection unit 601. The radiographic image obtained by the above-mentioned method is corrected by a gain correction unit 605 using gain correction data. do.

[0070] The first storage unit 606 stores the acquired radiation image data 607 and the burn-in prevention gain correction The burn-in-free gain correction data 608 is stored when burn-in occurs. By irradiating radiation and taking a picture in a state where no object is present, The second memory unit 609 stores the gain correction data with burn-in. The gain correction data with burn-in 610 and the attenuation amount data with burn-in 611 are stored. The image sensor 610 is irradiated with radiation when burn-in is occurring and when no object is present. This is the gain correction data obtained by shooting with the lens facing the camera. 611 is a decay time of burn-in measured at the time of factory inspection or installation of the radiation imaging device 600. The first storage unit 606 and the second storage unit 609 are data showing the amount of data. The control unit 100 may be configured as a memory unit.

[0071] The switching processing unit 612 selects gain correction data to be used for gain correction of the captured radiation image. The switching processing unit 612 switches the gain correction data to be used. The gain correction data is switched depending on the result of the judgment. For example, The switching processing unit 612 judges whether or not a predetermined switching condition is satisfied. If it is determined that the gain correction data is satisfied, the switching time estimation unit 613 switches the gain correction data to be used. Based on the attenuation amount data 611 of the burn-in stored in the second storage unit 609, The communication unit 614 communicates with the control device 640. The internal clock 615 acquires the shooting time, the elapsed time, etc. Power is supplied to each part in the radiography device 600 .

[0072] The control unit 602 reads out, for example, a program stored in the first storage unit 606. The entire radiation imaging apparatus 600 may be controlled based on the read program or the like. Alternatively, the radiation imaging device 600 may be controlled by a control signal generating circuit such as an ASIC. Alternatively, the entire radiation imaging apparatus 600 may be controlled by both the program and the control circuit. This may be done.

[0073] The radiation generating device 630 controls the radiation source 631. The radiation source 631 generates radiation. The radiation generating device 630 controls the radiation imaging device 600 to emit radiation. 630 includes an operation UI 632 for operating the radiation generating device 630. The operation UI 632 includes a keyboard, a mouse, etc. The user can use the operation UI 632 to, for example, It sets the radiation irradiation conditions and irradiates the radiation.

[0074] The control device 640 includes an imaging device control unit 641, a communication unit 642, and a radiation imaging application. The imaging device control section includes a power supply section 643, a power supply section 644, a display section 645, and an operation UI 646. A communication unit 641 controls the image acquisition timing and conditions of the radiation imaging device 600. The radiographic imaging device 600 and the radiation generating device 630 are controlled by the radiographic imaging device 42. The image application 643 collects and displays images captured by the radiation imaging device 600, and The power supply unit 644 controls the reception of orders and the registration of imaging information. Power is supplied to each component. The display unit 645 displays the captured image and the captured information. Operation UI 64 6 is a user interface for operating the radiography application. The UI 646 includes a keyboard, a mouse, and the like.

[0075] Here, the communication between the control device 640 and the radiation imaging device 600, and the The communication with the radiation generating device 630 is performed via, for example, RS232C, USB, or Ethernet ( The control device 640 may be a cable connection communication device using a standard such as IEEE 802.11b. and the radiation imaging device 600, and the control device 640 and the radiation generating device 630. The communication between the control device 640 may be a communication using a dedicated signal line or a wireless communication. and the radiation imaging device 600, and the control device 640 and the radiation generating device 630. The communication between the control device 640 and the radiation imaging device may be a combination of these. For example, image data, image acquisition condition settings, device status acquisition, and other control operations are performed between the device 600 and the image acquisition device 600. Communicate.

[0076] FIG. 7 is a diagram illustrating an example of the hardware configuration of the control unit 602 of the radiation imaging apparatus 600. As shown in FIG. The control unit 602 includes a CPU 701, a ROM 702, a RAM 703, a storage device 704, an input unit 705, a communication unit 706, and a bus 707. 703, the storage device 704, the input unit 705, and the communication unit 706 communicate with each other via a bus 707. possible connected.

[0077] The CPU (Central Processing Unit) 701 is The control program stored in the memory 702 is read out and various processes are performed. It executes the process and controls the entire radiation imaging apparatus 600. The SS Memory 703 is a temporary storage area such as the main memory and work area of ​​the CPU 701. The storage device 704 is, for example, an HDD or SSD, and is used to store various data and The input unit 705 stores the radiation image data obtained by imaging, The gain correction data is input to the communication unit 706. The communication unit 706 performs communication processing with the control device 640.

[0078] For example, the CPU 701 reads the program stored in the ROM 702 or the storage device 704. The above-mentioned functions of the control unit 602 are realized by reading out the program and executing the read program. This realizes the functions and processing described later.

[0079] FIG. 8 is a diagram showing an example of the configuration of an inspection apparatus to which the radiation imaging system according to this embodiment is applied. In FIG. 8, the components having the same functions as those shown in FIG. In FIG. 8, 801 denotes a radiation source 631 irradiating radiation such as X-rays. The line is shown. 802 is an object to be inspected, and 803 controls the position of the object 802. The conveyor belt is capable of moving the object 802. The apparatus is adapted to prevent burn-in from occurring in a captured image based on image data acquired from the radiation detection unit 601. In this case, the conveyor belt 803 is operated to send radiation 802 to a position where the subject 802 does not exist. 01 and adjust the gain. You can also select whether to adjust the gain. There are some examinations where you do not want to adjust the gain if image burn-in occurs. In some cases, the gain adjustment function can be turned off in the settings of the radiation generating device 630. do.

[0080] With reference to the flowchart shown in FIG. 9A, the update of gain correction data in this embodiment An example of the switching process will be described.

[0081] In step S901, the gain correction data acquisition unit 616 of the image acquisition unit 603 The first gain correction device is The gain correction data acquisition unit 616 acquires and stores the data. By irradiating and photographing, first gain correction data is obtained, and the first gain correction data obtained is The data is stored in the first storage unit 606 as burn-in-free gain corrected data 608 .

[0082] In step S902, the control unit 602 sets the number of times of shooting N to an initial value. In this example, the number of shots N is set to 1 as the initial value, and is incremented by 1 each time a photograph of the subject is taken. The number of entries shall be counted up.

[0083] In step S903, radiation is irradiated onto the subject to start imaging, and the radiation imaging device 60 0 performs the Nth shooting. After the Nth shooting is completed, the process of step S904 is executed.

[0084] In step S904, the switching processing unit 612 selects the radiation A determination is made as to whether or not burn-in occurs in an image based on image data obtained from the line detection unit 601. For example, based on visual confirmation of the captured image or a dark image (an image not exposed to radiation), Based on the result, the switching processing unit 612 selects whether or not burn-in occurs in the image. If the switching processing unit 612 determines that there is no burn-in, (NO in step S904), the gain correction data to be used is not changed, and the process returns to step On the other hand, if the switching processing unit 612 determines that burn-in occurs, If the answer is YES in step S904, the step S905 is executed to switch the gain correction data to be used. Then, the process of step S908 is executed.

[0085] In step S905, the gain correction unit 605 of the image processing unit 604 performs the process in step S901. The radiation image captured in step S903 is corrected by using the first gain correction data acquired in Correct the image.

[0086] In step S906, the control unit 602 determines whether or not there is a next photograph to be taken. If it is determined that the next photograph is to be taken (NO in step S906), the process proceeds to step S902. After counting up the number of times of shooting N by 1 in step S907, the process returns to step S903. If the control unit 602 determines that no image is to be captured (YES in step S906), the process shown in FIG. 9A is The process shown is then completed.

[0087] In step S908, the gain correction data acquisition unit 616 of the image acquisition unit 603 Perform gain calibration while the signal is being distorted to obtain the second gain correction data. The gain correction data acquisition unit 616 acquires and stores the data. The second gain correction data is obtained by shooting the image with the second gain correction data. The data is stored in the second storage unit 609 as burn-in-prevention gain correction data 610.

[0088] In step S909, the gain correction unit 605 of the image processing unit 604 performs the process in step S908. The radiation image taken in step S903 is corrected by using the second gain correction data obtained in step S903. Correct the image.

[0089] In step S910, the control unit 602 counts up the number of times of shooting N by one.

[0090] In step S911, radiation is irradiated onto the subject to start imaging, and the radiation imaging device 60 0 performs the Nth shooting. After the Nth shooting is completed, the process of step S912 is executed.

[0091] In step S912, the switching processing unit 612 selects the radiation A determination is made as to whether or not burn-in occurs in an image based on image data obtained from the line detection unit 601. In step S912, the switching processing unit 612 determines whether the image has been burned in in the past. If there is new burn-in, it is judged whether there is a new burn-in different from the previous one. If the switching processing unit 612 determines that the gain compensation is The process of step S913 is executed to switch the correct data. If the switching processing unit 612 determines that there is no Processing of 415 is executed.

[0092] In step S913, the gain correction data acquisition unit 616 of the image acquisition unit 603 The third gain correction data is obtained by performing gain calibration under the condition where the The gain correction data acquisition unit 616 acquires and stores the data. The third gain correction data is obtained by shooting the image with the third gain correction data. The data is stored in the second storage unit 609 as burn-in-prevention gain correction data 610.

[0093] In step S914, the gain correction unit 605 of the image processing unit 604 performs the process in step S913. The third gain correction data acquired in step S911 is used to correct the X-ray image taken in step S911. After the process in step S914 is completed, the process proceeds to step S919. nothing.

[0094] In step S915, the switching processing unit 612 determines whether the gain correction data has been changed by a certain amount since the previous acquisition of the gain correction data. Determine whether time has passed. A certain amount of time has passed since the previous gain correction data was acquired. If the switching processing unit 612 determines that the The process of step S916 is executed to switch the gain correction data. If the switching processing unit 612 determines that a certain period of time has not elapsed since the acquisition of the correction data, If the answer is NO in step S915, the process advances to step S918.

[0095] In step S916, the switching processing unit 612 switches the gain correction data to be used from the first stored The gain correction data is switched to the first gain correction data stored in the memory unit 606.

[0096] In step S917, the gain correction unit 605 of the image processing unit 604 performs a first gain correction The data is used to correct the radiographic image taken in step S911. After the process in step S917 is completed, the process proceeds to step S919.

[0097] In step S918, the gain correction unit 605 of the image processing unit 604 calculates the most recently acquired gain. The radiation image captured in step S911 is corrected using the in-correction data. After the process in step S918 is completed, the process proceeds to step S919.

[0098] In step S919, the control unit 602 determines whether or not there is a next photograph to be taken. If it is determined that there is a next photograph to be taken (NO in step S919), step S9 On the other hand, if the control unit 602 determines that there is no next photographing (step S91 If the answer is YES in step 9, the process shown in FIG. 9A is terminated.

[0099] According to this embodiment, when burn-in occurs, gain calibration is performed. Then, gain correction data is newly acquired, and the acquired gain correction data is used to calculate the radiation image. By correcting the image, it is possible to perform accurate gain correction immediately after image sticking occurs. When a certain period of time has elapsed after the occurrence of burn-in, the gain compensation data that was stored in advance is used to prevent burn-in. By switching to the gain correction function and correcting the radiation image, accurate gain correction is possible even after the burn-in disappears. You can set the expected time until the burn-in disappears as a fixed time. This can prevent an inverted image from being seen.

[0100] In the above explanation, if a certain amount of time has passed since the previous gain correction data was acquired, The gain correction data to be used is switched to the first gain correction data. Alternatively, the switching may be performed when a certain time has elapsed since the occurrence of the attachment.

[0101] In the process shown in the flowchart of FIG. 9A, the radiation When correcting an image, the most recently acquired gain correction data is used as is to correct the radiation image. For example, the most recently acquired gain correction data is used to attenuate burn-in. The radiological image may be corrected using the gain correction data adjusted based on the amount of radiation. Processing when adjusting the most recently acquired gain correction data based on the burn-in attenuation amount An example is shown in Figure 9B. In Figure 9B, the steps shown in Figure 9A are the same as those shown in Figure 9B. The same reference numerals are used.

[0102] The process shown in the flowchart of FIG. 9B is different from the process shown in the flowchart of FIG. 9A. The process in step S918 shown in FIG. 9A becomes the process in step S921 shown in FIG. 9B. The process other than this step is the same, so the description will be omitted.

[0103] In the process shown in FIG. 9B, in step S921, the gain correction unit 604 605 is the fourth gain correction data that has been adjusted based on the burn-in attenuation amount. The radiation image captured in step S911 is corrected using the gain correction data. Specifically, the first gain correction data without burn-in and the second gain correction data with burn-in are taken. Or, the amount of burn-in is calculated from the time when the third gain correction data is acquired. The amount of attenuation of image sticking is measured when the image sticking is first captured or when the radiation imaging device 600 is installed. The data shown in FIG. 6 is stored in the second storage unit 609 as burn-in attenuation amount data 611. The gain correction unit 605 compares the stored burn-in attenuation data 611 with the second or third Correcting the radiological image using the fourth gain correction data calculated using the gain correction data In this way, the radiation image is corrected using the gain correction data adjusted based on the amount of attenuation. By correcting the image, the remaining burn-in will disappear (after a certain period of time). Accurate gain correction can be performed according to the amount.

[0104] In the processing example shown in FIG. 9A, a certain time has passed since the previous acquisition of gain correction data. When the image is burned in, the gain correction data acquired after the image burn-in occurs is changed to the first gain correction data. However, the present invention is not limited to this. For example, the switching may be performed based on the attenuation of the burn-in. Alternatively, the switching may be performed after a time that is estimated to be sufficient to eliminate the burn-in problem has elapsed. For example, the number of shots taken since the last gain correction data was acquired or since image burn-in occurred. It may be possible to switch the image when the number of shadows exceeds a certain number. When the time when the image sticking is estimated to disappear has elapsed, the process of switching to the new setting is performed. An example of this is shown in Figure 9C. Also, the gain correction data may be changed from the previous acquisition or when burn-in occurs. Figure 1 shows an example of a process for switching the camera when the number of shots taken since the camera was born exceeds a certain number. Shown in 9D.

[0105] The process shown in the flowchart of FIG. 9C is different from the process shown in the flowchart of FIG. 9A. The process in step S915 shown in FIG. 9A becomes the process in step S941 shown in FIG. 9C. The process other than this step is the same, so the description will be omitted.

[0106] In the process shown in FIG. 9C, in step S941, the switching processing unit 612 Based on the amount of decay, it is determined whether or not a time has passed that is estimated to be required for the burn-in to disappear. If the switching processing unit 612 determines that the estimated time has elapsed (step S941 (YES in step 603), the gain correction data to be used is stored in the first storage unit 606. The process of step S916 is executed to switch to the gain correction data. If the switching processing unit 612 determines that the time has not elapsed (NO in step S941), O), the process of step S918 is executed.

[0107] In step S941, for example, the switching time estimation unit 613 determines the amount of image sticking that has occurred and the second Based on the attenuation amount data 611 of the burn-in stored in the memory unit 609, the burn-in is eliminated. Then, the switching processing unit 612 estimates the time when the burn-in will disappear. It is determined whether the estimated time has elapsed, and if it is determined that the estimated time has elapsed, the process proceeds to step 416. Then, the gain correction data to be used is switched to the first gain correction data. This allows the gain correction data to be switched to the first one after a certain period of time has elapsed. This allows you to estimate the time it will take for the image to disappear more accurately than setting the default setting. It is possible.

[0108] The process shown in the flowchart of FIG. 9D is the same as the process shown in the flowchart of FIG. 9A. The process in step S915 shown in FIG. 9A is the same as the process in step S961 shown in FIG. 9D. The process other than this step is the same, so the description will be omitted.

[0109] In the process shown in FIG. 9D, in step S961, the switching processing unit 612 The number of shots taken since the acquisition of image correction data or the occurrence of image burn-in exceeds a certain number. If the switching processing unit 612 determines that the number of times of shooting has exceeded a certain number of times, (YES in step S961), the gain correction data to be used is stored in the first storage unit 606. The process of step S916 is executed to switch to the first gain correction data stored in the memory. On the other hand, if the switching processing unit 612 determines that the number of times of shooting has exceeded a certain number (step If the result of step S961 is NO, the process of step S918 is executed. In tests where the shooting scenario (shooting mode and number of shots) is fixed, time information and burn-in Accurate gain correction can be performed without performing complex processing such as estimation from the amount of attenuation. This makes it possible to prevent an inverted image from being seen.

[0110] In the example shown in FIGS. 9C and 9D, when correcting the radiation image in step S918, The most recently acquired gain correction data is used as is, but as shown in Figure 9B As described above, the gain correction data adjusted based on the amount of attenuation may be used. , switching from the gain correction data acquired after the burn-in occurred to the first gain correction data The conditions are not limited to the conditions shown in each of FIG. 9A, FIG. 9C, and FIG. 9D. 9C and 9D may be selectively combined.

[0111] (Other embodiments) The present disclosure relates to a program for implementing one or more functions of the above-described embodiments, the program being transmitted over a network or The data is supplied to a system or device via a storage medium, and the data is then stored in the computer of the system or device. It is also possible to realize a process in which one or more processors in the system read and execute a program. It may also be realized by a circuit (eg, ASIC) that realizes one or more functions.

[0112] It should be noted that the above-described embodiments are merely illustrative examples of how the present disclosure may be implemented. The technical scope of the present disclosure is not to be construed as being limited by these. may be implemented in various forms without departing from its technical concept or main features. can.

[0113] The disclosure of the present embodiment includes the following configurations, methods, etc. (Configuration 1) It contains a scintillator that converts radiation into light and a photoelectric conversion element that converts light into electric charges, and produces images. A radiation detection unit that generates A first image is generated by the radiation detection unit in a radiation irradiation state, and then the radiation an acquisition unit that acquires a second image generated by the radiation detection unit in a state where radiation is not irradiated; an estimation unit that estimates the presence or absence of burn-in of the scintillator based on the second image; A radiation imaging apparatus comprising: (Configuration 2) The reset operation of the radiation detection unit is performed after the first image is acquired and after the second image is acquired. and is performed after the acquisition of the second image. Radiography device. (Configuration 3) The estimation unit estimates the signal when a difference between pixel values ​​in the second image is equal to or greater than a threshold value. It is assumed that a burn-in of the chiller occurs, and the difference in pixel values ​​in the second image is not equal to or greater than a threshold value. In the case where the scintillator is not burned in, it is estimated that there is no burn-in of the scintillator. The radiation imaging apparatus according to claim 1 . (Configuration 4) The image processing device further includes a first correction unit for correcting the first image by using first correction data. death, The first correction unit is configured to correct the scintillator burn-in when the estimation unit estimates that the scintillator burn-in occurs. In the case where the first correction data is updated, any one of the configurations 1 to 3 is characterized in that 2. A radiation imaging apparatus according to claim 1 . (Configuration 5) When the estimation unit estimates that burn-in of the scintillator occurs, The third image generated by the radiation detection unit in a state where there is no subject and where radiation is being applied is Acquire an image, The first correction unit is configured to correct the scintillator burn-in when the estimation unit estimates that the scintillator burn-in occurs. If the third image is detected, the first correction data is updated based on the third image. 5. The radiation imaging apparatus according to claim 4. (Configuration 6) The acquisition unit acquires a plurality of third images, The first correction unit updates the first correction data based on the plurality of third images. 6. The radiation imaging apparatus according to configuration 5. (Configuration 7) The operating condition for generating the second image of the radiation detection unit is Any one of configurations 1 to 6, characterized in that the operating conditions are the same as those for generating the first image. 3. The radiation imaging device according to claim 1. (Configuration 8) The frame rate for generating the second image of the radiation detection unit is Configurations 1 to 6, characterized in that the frame rate for generating the first image is faster than the frame rate for generating the second image. 13. The radiation imaging apparatus according to claim 12 . (Configuration 9) The estimation unit estimates burn-in of the scintillator based on an image obtained by image processing of the second image. 9. The radiation imaging apparatus according to any one of claims 1 to 8, further comprising: a detector for detecting a presence or absence of a radiation image. . (Configuration 10) When the estimation unit estimates that the scintillator has burn-in, a notification is given. 4. The radiation imaging device according to claim 1, further comprising a notification unit. Device. (Configuration 11) The image processing device further includes a first correction unit for correcting the first image by using first correction data. death, When an instruction corresponding to the notification from the notification unit is received, the first correction unit 11. The radiation imaging apparatus according to configuration 10, wherein the correction data is updated. (Configuration 12) Any one of configurations 1 to 11, characterized in that the first image is an image of a plurality of frames. 3. The radiation imaging device according to claim 1. (Configuration 13) each of the first image and the second image is a one-frame image; The acquisition unit acquires a frame of the first image and a frame of the second image. Repeat multiple times, The estimation unit estimates burn-in of the scintillator based on the final frame of the second image. 12. The radiation imaging device according to any one of configurations 1 to 11, characterized in that the presence or absence is estimated. (Configuration 14) a second correction unit that corrects the frame of the first image based on the frame of the second image; 14. The radiation imaging apparatus according to configuration 13, further comprising: (Configuration 15) The reset operation of the radiation detection unit is performed after the acquisition of the first image and the acquisition of the second image. The second image acquisition step is not performed during the multiple repetitions, but is performed after the acquisition of the final frame of the second image. 15. The radiation imaging apparatus according to configuration 13 or 14, (Configuration 16) The estimation unit estimates the second image by detecting the radiation detection unit in a non-irradiated state in advance. Based on the image obtained by subtracting the fourth image generated by the above, the presence or absence of burn-in of the scintillator was determined. 16. The radiation imaging device according to any one of configurations 1 to 15, wherein the absence is estimated. (Configuration 17) A radiation image captured by a detection means for detecting incident radiation and gain correction data are acquired. A means of acquisition that is advantageous, a gain correction means for correcting the radiation image using the gain correction data; When burn-in occurs in the detection means, the gain correction means The gain calibration is performed on the radio wave. A radiation imaging apparatus that corrects a radiation image. (Configuration 18) A switching means for switching the gain correction data used for correction in the gain correction means Step by step, A storage means for storing the first gain correction data obtained when no burn-in occurs. and The switching means is adapted to switch the image capturing mode in response to at least one of the elapsed time after the occurrence of image sticking and the number of times of photographing. The gain correction data to be used is the first gain correction data stored in the storage means. 18. The radiation imaging apparatus according to claim 17, wherein the data is switched to the data. (Configuration 19) The switching means is configured to switch the gain correction data after a predetermined time has elapsed since the image sticking occurred and the gain correction data was acquired. When the time has elapsed, the gain correction data to be used is switched to the first gain correction data. 20. The radiation imaging apparatus according to configuration 18, wherein the imaging device is switched. (Configuration 20) The switching means selects a display to be used when a predetermined time has elapsed since burn-in occurred. The gain correction data is switched to the first gain correction data. 19. A radiation imaging apparatus according to claim 18 or 19. (Configuration 21) The switching means selects a mode to be used when a time estimated from the amount of burn-in attenuation has elapsed. The gain correction data is switched to the first gain correction data. 21. The radiation imaging apparatus according to any one of items 18 to 20. (Configuration 22) The switching means is configured to select a mode to be used when the number of times of photographing after the occurrence of burn-in exceeds a predetermined number. the gain correction data is switched to the first gain correction data. 22. The radiation imaging apparatus according to any one of configurations 18 to 21. (Configuration 23) The gain correction means performs gain calibration after the occurrence of burn-in. The gain correction data obtained by performing the above-mentioned image forming method is adjusted based on the amount of attenuation of image sticking. The radiological image is corrected using the gain correction data. 2. A radiation imaging apparatus according to any one of claims 1 to 11. (Configuration 24) When burn-in occurs in the detection means, the gain calibration is performed. 24. The method according to claim 17, wherein the method can be selected whether or not to perform the method. Radiography equipment. (Configuration 25) A radiation imaging device according to any one of configurations 1 to 24, A radiation source that emits radiation; A radiation imaging system comprising: (Method 1) It contains a scintillator that converts radiation into light and a photoelectric conversion element that converts light into electric charges, and produces images. A method for controlling a radiation imaging apparatus having a radiation detection unit that generates a radiation image, comprising the steps of: A first image is generated by the radiation detection unit in a radiation irradiation state, and then the radiation an acquisition step of acquiring a second image generated by the radiation detection unit in a state where radiation is not irradiated; and, an estimation step of estimating the presence or absence of burn-in of the scintillator based on the second image; 13. A method for controlling a radiation imaging apparatus comprising: (Method 2) A method for controlling a radiation imaging apparatus having a detection unit for detecting incident radiation, comprising the steps of: an acquisition step of acquiring a radiographic image and gain correction data captured by the detection means; , and a gain correction step of correcting the radiation image using the gain correction data. death, In the gain correction step, when burn-in occurs in the detection means, Using the gain correction data obtained by performing gain calibration after the occurrence A method for controlling a radiation imaging apparatus, comprising: correcting the radiation image. (Program 1) A computer of a radiation imaging apparatus having a detection means for detecting incident radiation, an acquisition step of acquiring a radiographic image and gain correction data captured by the detection means; , and performing a gain correction step of correcting the radiation image using the gain correction data. Let them go, In the gain correction step, when burn-in occurs in the detection means, Using the gain correction data obtained by performing gain calibration after the occurrence A program for executing a process for correcting the radiation image. [Explanation of symbols]

[0114] 100: radiation imaging device, 101: control unit, 102: radiation image acquisition unit, 103: image processing unit processing unit, 104: offset correction unit, 105: gain correction unit, 106: memory unit, 107: radio wave X-ray image, 108: offset correction data, 109: gain correction data, 110: image capture data Rear FPN image, 111: burn-in estimation unit, 112: communication unit, 200: radiation detection unit, 30 0: Radiation generating device, 301: Radiation source, 400: Control device

Claims

1. an acquisition means for acquiring a radiation image captured by a detection means for detecting incident radiation and gain correction data; a gain correction means for correcting the radiation image using the gain correction data; The radiation imaging apparatus according to claim 1, wherein the gain correction means corrects the radiation image using the gain correction data acquired by performing gain calibration after burn-in occurs in the detection means when burn-in occurs.

2. A switching means for switching the gain correction data used for correction in the gain correction means; a storage means for storing the first gain correction data obtained when no burn-in occurs, 2. The radiation imaging apparatus according to claim 1, wherein the switching means switches the gain correction data to be used to the first gain correction data stored in the memory means, depending on at least one of the time elapsed since the occurrence of burn-in and the number of times imaging has been performed.

3. 3. The radiation imaging apparatus according to claim 2, wherein the switching means switches the gain correction data to be used to the first gain correction data when a predetermined time has elapsed since the gain correction data was acquired after burn-in occurred.

4. 3. The radiation imaging apparatus according to claim 2, wherein the switching means switches the gain correction data to be used to the first gain correction data when a predetermined time has elapsed since image sticking occurred.

5. 3. The radiation imaging apparatus according to claim 2, wherein the switching means switches the gain correction data to be used to the first gain correction data when a time estimated from an attenuation amount of image sticking has elapsed.

6. 3. The radiation imaging apparatus according to claim 2, wherein the switching means switches the gain correction data to be used to the first gain correction data when the number of times of imaging after the occurrence of burn-in exceeds a predetermined number.

7. 2. The radiation imaging device according to claim 1, wherein, after burn-in has occurred, the gain correction means corrects the radiation image using gain correction data obtained by performing gain calibration after the burn-in has occurred and adjusting the gain correction data based on an amount of attenuation of the burn-in.

8. 2. The radiation imaging apparatus according to claim 1, wherein, when burn-in occurs in the detection means, it is possible to select whether or not to perform the gain calibration.

9. A radiation imaging apparatus according to any one of claims 1 to 8, A radiation source that emits radiation; A radiation imaging system comprising:

10. A method for controlling a radiation imaging apparatus having a detection unit for detecting incident radiation, comprising the steps of: an acquisition step of acquiring a radiographic image captured by the detection means and gain correction data; and a gain correction step of correcting the radiation image using the gain correction data, a gain correction step of correcting the radiation image using the gain correction data obtained by performing gain calibration after burn-in has occurred, when burn-in has occurred in the detection means, said gain correction step being characterized in that

11. A computer of a radiation imaging apparatus having a detection means for detecting incident radiation, an acquisition step of acquiring a radiographic image captured by the detection means and gain correction data; and a gain correction step of correcting the radiation image using the gain correction data. a program for executing, in the gain correction step, a process of correcting the radiographic image using the gain correction data acquired by performing gain calibration after the occurrence of burn-in when burn-in occurs in the detection means.

Images