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

Abstract

To acquire a radiation image after correction suitable for examination by obtaining accurate position information in a simpler way.SOLUTION: A radiation imaging method includes: detecting a radioactive ray emitted from radiation irradiation means with radiation detection means; acquiring position information on the radiation detection means from at least one of a plurality of position information detection means; switching the position information detection means for acquiring the position information according to the radioactive ray detection state of the radiation detection means; and correcting an image signal based on the detected radioactive ray using three-dimensional dose distribution information on the radioactive ray emitted to the position information detection means from the radiation irradiation means, and the acquired position information.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

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

[0003] Some radiation imaging devices have a variable position of the flat panel detector. In such radiation imaging devices, the amount of radiation reaching the flat panel detector changes depending on the position of the flat panel detector due to the heel effect and the difference in the effective thickness of the additional filter. In response to this, some radiation imaging devices correct the change in the output signal of the flat panel detector caused by the change in the amount of radiation reaching the flat panel detector. For example, in the radiation irradiation device disclosed in Patent Document 1, the distribution of the irradiated radiation amount is stored in advance as three-dimensional information on the plane on which the flat panel detector moves. Then, based on the three-dimensional radiation amount distribution information stored in advance, the non-uniformity caused by the distribution of the radiation amount occurring in the photographed image of the subject is corrected.

[0004] On the other hand, if the position information of the flat panel detector is unknown, it is not possible to correct non-uniformity caused by the distribution of radiation dose occurring in the captured image of the subject based on the three-dimensional radiation dose distribution information. In the radiation irradiation device disclosed in Patent Document 1, the position of the flat panel detector is positioned at a position predetermined by an imaging control unit using a driving unit such as a stage, and therefore the position information of the flat panel detector can be obtained from the driving unit.

[0005] In addition, in industrial non-destructive testing equipment, continuous shooting is used to capture images at a high frame rate while rotating the flat panel detector continuously without stopping in order to shorten the image capture time. In non-destructive testing, three-dimensional data may be reconstructed based on the captured images. In such cases, it is required to correct the output image in the flat panel detector in order to shorten the processing time on the non-destructive testing equipment side. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2023-070952 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, if the position information required for correction is obtained from outside the flat panel detector while transferring images at a high frame rate, there are concerns that communication delays and packet loss may increase.In addition, adding a separate transmission path to obtain the position information of the flat panel detector would increase the wiring, leading to higher implementation costs.

[0008] The present disclosure has been made in view of the above background, and has as one object to obtain accurate position information by a simpler method and to obtain a corrected radiographic image suitable for examination. [Means for solving the problem]

[0009] In order to solve the above problem, a radiation imaging apparatus according to an aspect of the present disclosure includes: a radiation detection means for detecting radiation irradiated from the radiation irradiating means; a position information acquiring means for acquiring position information of the radiation detection means from at least one of a plurality of position information detecting means; a switching means for switching between position information detection means for acquiring the position information according to a state related to the detection of the radiation by the radiation detection means; an image processing means for correcting an image signal based on the detected radiation, using three-dimensional dose distribution information regarding the radiation irradiated from the radiation irradiating means to the radiation detecting means and the acquired position information; Equipped with. Effect of the Invention

[0010] According to one aspect of the present disclosure, it is possible to obtain accurate position information by a simpler method, and to obtain a corrected radiographic image suitable for examination. [Brief description of the drawings]

[0011] [Figure 1] 1 is a diagram illustrating an example of a configuration of a radiation imaging apparatus according to an embodiment of the present disclosure. [Diagram 2] 13 is a flowchart showing a process of generating dose distribution data. [Diagram 3] FIG. 4 is a diagram showing an example of a shooting condition table. [Figure 4] FIG. 13 is a diagram for explaining a method for generating three-dimensional radiation dose information. [Diagram 5] This is a series of examination flows using continuous photography. [Figure 6] FIG. 1 illustrates a method for correcting image non-uniformity due to radiation dose distribution. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, with reference to the accompanying drawings, an exemplary embodiment for carrying out the present disclosure will be described in detail. Note that the following embodiments do not limit the invention according to the claims. Although a plurality of features are described in the embodiments, not all of these features are essential to the invention, and the plurality of features may be combined arbitrarily. Furthermore, the dimensions, materials, shapes, and relative positions of components described in the following embodiments are arbitrary and can be changed according to the configuration of the device to which the present disclosure is applied or various conditions. In addition, in the accompanying drawings, the same reference numbers are used between the drawings to indicate identical or functionally similar elements, and duplicated descriptions are omitted.

[0013] In the following embodiments and claims, a radiation imaging device using X-rays will be described as an example of radiation. However, the radiation imaging device according to the present disclosure can also include electromagnetic radiation such as gamma rays, particle radiation such as alpha rays, beta rays, particle beams, proton beams, heavy ion beams, and meson beams, in addition to X-rays.

[0014] First Embodiment (Configuration of Radiation Imaging Apparatus) A radiation imaging device, a radiation imaging system, and a method for controlling a radiation imaging device according to a first embodiment of the present disclosure will be described below with reference to Figs. 1 to 6. Fig. 1 is a diagram illustrating an example of an overall configuration of a radiation imaging system 100 according to the first embodiment of the present disclosure. The radiation imaging system 100 includes, for example, a radiation irradiation unit 101, a radiation imaging device 102, an imaging condition setting unit 103, an imaging control unit 104, an image display unit 112, and a position control mechanism 113.

[0015] The radiation irradiating unit 101 irradiates the subject with radiation. The radiation irradiating unit 101 includes a radiation generating unit 101a, a collimator 101b, and a filter 101c. The radiation generating unit 101a may be composed of a tube that generates radiation. The collimator 101b defines the beam spread angle of radiation generated by the radiation generating unit 101a. The filter 101c is composed of, for example, an aluminum material, and can be attached to and detached from the collimator, and can be replaced by a filter replacement mechanism. The radiation irradiating unit 101 of this embodiment can use multiple types of AL filters with different thicknesses, such as 2 mm and 5 mm, as a filter (hereinafter also referred to as an AL filter) made of an aluminum material. The filter replacement mechanism can perform a filter replacement operation of attaching an AL filter to the collimator or removing an AL filter from the collimator.

[0016] The imaging condition setting unit 103 has an imaging condition input unit into which the operator inputs imaging condition information. The imaging information includes a tube voltage, a tube current, an irradiation time, a focal spot size, a thickness of an aluminum filter to be added, and information on the distance between the radiation irradiation unit 101 and the radiation detection unit 105. The imaging condition setting unit 103 transmits the imaging condition information input from the imaging condition input unit to the imaging control unit 104.

[0017] The imaging control unit 104 can control the radiation irradiating unit 101 and the radiation detection unit 105 based on the imaging condition information received from the imaging condition setting unit 103. The imaging control unit 104 can generate an irradiation instruction signal for causing the radiation irradiating unit 101 to irradiate radiation and an imaging control signal for driving the radiation detection unit 105 based on the imaging condition information acquired from the imaging condition setting unit 103. The imaging control unit 104 can control the radiation irradiation timing from the radiation irradiating unit 101 and the imaging timing of the radiation detection unit 105 via these signals.

[0018] The position control mechanism 113 supports the radiation imaging device 102 and adjusts the relative position between the radiation irradiation unit 101 and the radiation imaging device 102 under the control of the imaging control unit 104. The position control mechanism 113 also rotates the radiation imaging device 102 and controls the position of the radiation imaging device 102 based on the calculated position. The imaging control unit 104 can further control the operation of the position control mechanism 113 so as to adjust the relative position to a predetermined position based on the imaging condition information. The position control mechanism 113 can further detect the position of the radiation imaging device 102 (radiation detection unit 105) relative to the radiation and transmit the position information to the position information acquisition unit 107 via the imaging control unit 104. In this way, position information obtained from outside the radiation imaging device 102, such as the imaging control unit 104 or the position control mechanism 113, rather than from within the radiation imaging device 102, is regarded as external position information.

[0019] 1, the imaging control unit 104, the imaging condition setting unit 103, and the image display unit 112 are shown as separate components, but they may be integrated into a single unit, for example, a control PC for the radiation imaging system 100. In this case, the imaging condition setting unit 103 may be substituted by the image display unit 112, which may be used as a GUI (Graphic User Interface). Also, these may be appropriately combined according to the examination system in the hospital, and may be connected by an in-hospital LAN (Local Area Network) or the like.

[0020] In this embodiment, the radiation imaging device 102 is configured in the form of a flat panel detector, and includes a radiation detection unit 105 therein. In addition to the radiation detection unit 105, the radiation imaging device 102 may further include an image processing unit 110, an acceleration detection unit 106, and a position information acquisition unit 107. In the radiation detection unit 105, pixels including an image sensor that outputs a radiation signal corresponding to radiation (incident light) irradiated from the radiation irradiation unit 101 are arranged in an array (a two-dimensional planar region). The photoelectric conversion element of each pixel converts light converted by a phosphor into a radiation signal (hereinafter also referred to as an image signal) which is an electrical signal, and the capacitor of each pixel accumulates the charge of the radiation signal (image signal). The radiation detection unit 105 reads out the image signal accumulated in the capacitor of each pixel, and transmits it to the image processing unit 110. Note that, although an indirect conversion type radiation detection unit that converts radiation into light and then converts it into an electric charge is used here, a direct conversion type radiation detection unit that directly converts radiation into an electric charge may also be used.

[0021] The acceleration detection unit 106 acquires acceleration information of the radiation detection unit 105 as raw information on the position, and outputs this. In this embodiment, a case will be described in which a three-axis acceleration sensor that outputs acceleration in each axis direction of three axes (X-axis, Y-axis, and Z-axis) of a Cartesian coordinate system as raw information on the position is used as the acceleration detection unit 106. The position information acquisition unit 107 can include a position calculation unit 108 and a position information acquisition method switching unit 109. The position calculation unit 108 calculates position information from the output of the acceleration detection unit 106 and sends it to the image processing unit 110. In the following description, information on the position calculated from information obtained in the radiation imaging device 102 or raw information for calculating information on the position is referred to as internal position information. In this embodiment, an acceleration sensor is used to acquire internal position information, but the method of acquiring internal position information is not limited to this, and various known methods can be used.

[0022] The method of calculating this position information can be, for example, a method of calculating the amount of movement for each of the three axes of the Cartesian coordinate system from a double integral of the acceleration obtained from the acceleration detection unit 106 for each of the three axes of the Cartesian coordinate system. The internal position information can be obtained by integrating the amount of movement with the position information at the start of the movement.

[0023] The image processing unit 110 performs processes such as gradation processing and noise reduction processing on the image signal transmitted from the radiation detection unit 105. The image processing unit 110 transmits the processed image signal to the image display unit 112. The image display unit 112 outputs the image information transmitted from the image processing unit 110 to a monitor or the like.

[0024] (Timing for switching location information acquisition methods) In the present disclosure, the position information acquisition method switching unit 109 is used to appropriately switch the original information related to the position used in generating the position information in accordance with the output destination. Then, by switching the acquisition destination of such original information and stopping acquisition of the output from the acceleration sensor, it is possible to avoid acquisition of accumulated noise while the radiation imaging device 102 is stopped. This reduces the influence of the accumulated noise of the acceleration sensor, and makes it possible to reduce deviation of the position information caused by the accumulated noise. The switching of the acquisition destination of the original information related to the position in this embodiment will be described below. Note that this switching of the acquisition destination may be performed according to the setting of the imaging conditions or according to a user operation.

[0025] Switching of the acquisition destination, which is executed according to the settings of the imaging conditions, is most likely to occur in the inspection process. For example, the switching process is executed when a timing signal for starting and ending imaging, which is set in the processing flow of continuous imaging, is received. Details of the switching executed according to the settings will be described again in the processing flow of continuous imaging, which will be described later.

[0026] The switching executed in response to the user's operation may occur in the event of an emergency operation. An example of an emergency operation or designation is an emergency stop of continuous shooting. When an emergency stop operation is input from the shooting condition setting unit 103 while acquiring internal position information during continuous shooting, a signal regarding the emergency stop is transmitted to the position information acquisition method switching unit 109 via the shooting control unit 104. In response to this signal, the position information acquisition method switching unit 109 switches the acquired position information from internal position information to external position information.

[0027] Furthermore, in the event of such an emergency stop, for example, debugging of position information acquisition by an acceleration sensor is performed as a temporary operation to perform recovery work of the radiation imaging system 100. In this case, the imaging condition setting unit 103 transmits a signal regarding recovery of imaging to the position information acquisition method switching unit 109 via the imaging control unit 104 at any timing of the user's choice. In response to this signal, the position information acquisition method switching unit 109 can switch the position information to be acquired from external position information to internal position information.

[0028] The user can be notified of such switching of the acquired location information. In this embodiment, for example, in order to determine the location information acquired by the user, the currently acquired location information can be displayed on the monitor of the image display unit 112 by the shooting control unit 104. In this embodiment, whether the internal location information or the external location information is being used as the location information is displayed on the image display unit 112. However, the manner of notifying the user of the acquired location information is not limited to displaying it on a monitor, and various known notification methods can be used, such as arranging a lamp for switching display.

[0029] (3D dose distribution data generation flow) Hereinafter, with reference to Fig. 2, a generation process of dose distribution data used together with position information when correcting an image signal output by the radiation detection unit 105 according to the first embodiment of the present disclosure will be described. Fig. 2 shows a flowchart of the process of generating radiation distribution data. When a user presses a dose distribution data generation start button provided in the imaging condition setting unit 103, the process shown in Fig. 2 is started.

[0030] In step S201, the imaging control unit 104 controls the position control mechanism 113 to set the distance between the radiation irradiation unit 101 and the radiation detection unit 105 to the minimum value L 0 So that it becomes.

[0031] In step S202, the shooting control unit 104 sets the shooting condition number N to an initial value of 1.

[0032] In step S203, the imaging control unit 104 selects imaging condition information including the tube voltage kV, the tube current mA, the accumulation time ms, and the focal spot size corresponding to the imaging condition number N from the imaging condition table illustrated in FIG. 3. The imaging control unit 104 transmits the selected information to the radiation irradiation unit 101.

[0033] In step S204, the imaging control unit 104 selects information on the thickness of the AL filter corresponding to the imaging condition number N from the table of imaging conditions shown in Fig. 3. The imaging control unit 104 transmits the selected information to the radiation irradiation unit 101. The radiation irradiation unit 101 attaches an AL filter (101c) that matches the received information on the thickness of the AL filter to the collimator 101b by a built-in filter replacement mechanism (not shown).

[0034] In step S205, the imaging control unit 104 controls the radiation irradiation unit 101 to irradiate radiation from the radiation irradiation unit 101. Then, the imaging control unit 104 transmits an imaging control signal to the radiation detection unit 105. Based on the received imaging control signal, the radiation detection unit 105 converts the reaching radiation into a dose information signal for each pixel.

[0035] In step S206, the radiation detection unit 105 transmits a dose information signal for each pixel to the image processing unit 110.

[0036] In step S207, the image processing unit 110 generates three-dimensional information on the amount of radiation irradiated from the radiation irradiation unit 101 based on the dose information signal (pixel signal) received for each pixel. Here, a method for generating three-dimensional information according to the present disclosure will be described with reference to FIG. 4. The dose information signal for each pixel of the radiation detection unit 105 received by the image processing unit 110 in step S206 is represented by the following (Equation 1). Here, i and j are pixel coordinates on the X-axis and Y-axis of the radiation detection unit 105, respectively.

number

[0037] In step S207, the image processor 110 calculates the distance L 0 Dose information for each pixel detected by D 0,i,j According to the square law of radiation dose, the distance L is calculated for each pixel by the following formula (2): 1 Dose information in D 1,i,j Convert to.

number

number

[0038] Next, the image processor 110 measures the distance L 1 Similarly, the distance L is calculated using the following (Equation 4) and (Equation 5). 2 Dose information for each pixel in D2,i,j Approximate to a quadratic function.

number

number

[0039] In step S208, the shooting control unit 104 adds 1 to the shooting condition number N.

[0040] In step S209, the imaging control unit 104 judges whether the imaging condition number N exceeds a preset upper threshold Nmax of the imaging condition number. If it is judged that the imaging condition number N does not exceed the upper threshold Nmax of the imaging condition number, the imaging control unit 104 returns the flow to step S203 and repeats the processes of steps S203 to S208. If it is judged that the imaging condition number N exceeds the upper threshold Nmax, the imaging control unit 104 ends the flow of generating dose distribution data.

[0041] By executing the above-described processing, it is possible to obtain dose distribution data that is used together with position information when correcting the image signal output by the radiation detection unit 105. Note that the processing exemplified here is an example of processing for acquiring dose distribution data, and the method for acquiring dose distribution data is not limited to this example.

[0042] (Continuous shooting process flow) Next, radiographic image capturing processing according to the first embodiment of the present disclosure will be described with reference to Fig. 5. Fig. 5 is a flowchart showing a series of processing from start to end of continuous imaging according to the first embodiment of the present disclosure. The processing shown in Fig. 5 is started when a user operates an imaging condition input means provided in the imaging condition setting unit 103, for example.

[0043] In step S501, the user selects one imaging condition from the table of imaging conditions shown in Fig. 3 by using the imaging condition input means installed in the imaging condition setting unit 103, and inputs the corresponding imaging condition number N. Furthermore, the user also inputs setting information related to the rotation operation of the position control mechanism 113 together with this input operation.

[0044] Furthermore, when the imaging conditions are set, the radiation imaging device 102 is driven by the position control mechanism 113 so as to be placed at a predetermined start position. At that time, internal position information of the radiation imaging device 102 is not acquired based on the output of the acceleration detection unit 106 until an acceleration detection start signal, which will be described later, is transmitted to the position information acquisition unit 107. However, during this time, external position information may be acquired from the imaging control unit 104 at any timing.

[0045] The imaging condition information corresponding to the input imaging condition number and setting information regarding the rotation operation of the position control mechanism are transmitted to the imaging control unit 104. In addition, the imaging control unit 104 transmits the latest external position information of the radiation imaging device 102 (position information indicating a predetermined start position) to the position information acquisition unit 107.

[0046] In step S502, the imaging control unit 104 transmits an imaging start signal to the radiation detection unit 105. As described above, when continuous imaging is performed in response to the imaging start signal, bidirectional communication is not possible between the imaging control unit 104 and the radiation imaging apparatus 102. For this reason, after receiving the imaging start signal in step S502, continuous imaging is automatically performed on the radiation imaging apparatus 102 side. In other words, the radiation imaging apparatus 102 does not perform bidirectional communication with the imaging control unit 104, such as receiving external position information from the imaging control unit 104, but only transmits the radiation image generated by the image processing unit 110 to the image display unit 112.

[0047] In step S503, the shooting control unit 104 transmits an acceleration detection start signal to the position information acquisition unit 107. Upon receiving the acceleration detection start signal, the position information acquisition unit 107 switches the acquired position information to internal position information in the position information acquisition method switching unit 109. The position information acquisition unit 107 continues to acquire output values ​​from the acceleration detection unit 106 and calculate internal position information in the position calculation unit 108 until it receives an acceleration detection stop signal, which will be described later. Note that the cycle for acquiring output values ​​from the acceleration detection unit 106 is determined by the capabilities (processing speeds) of the acceleration detection unit 106 and the position calculation unit 108. Also, although the signal transmission in step S502 and the signal transmission in step S503 are executed continuously here, they may be executed simultaneously.

[0048] In step S504, the position control mechanism 113 starts the rotation operation of the radiation imaging device 102. The rotation operation by the position control mechanism is executed in accordance with the conditions set by the imaging condition setting unit 103 in step S501. Next, based on the received imaging condition information, the imaging control unit 104 controls the radiation irradiating unit 101 to irradiate the subject with radiation under conditions that match the corresponding imaging condition number.

[0049] In step S505, the radiation detection unit 105 accumulates electric charges obtained by the reaching radiation as a dose information signal for each pixel. The accumulation time of the dose information signal is determined by the frame rate of the continuous imaging.

[0050] In step S506, the radiation detection unit 105 transmits the accumulated dose information signal for each pixel to the image processing unit 110. When the image processing unit 110 receives the dose information signal, the position information acquisition unit 107 simultaneously receives, from the acceleration detection unit 106, information on the position that serves as the basis for internal position information of the radiation imaging device 102 at the time of receiving the image signal.

[0051] In step S507, the image processing unit 110 performs a process for correcting image non-uniformity caused by the distribution of radiation irradiated from the radiation irradiator 101, for the dose information signal for each pixel received in step S506. The process performed in step S507 will be described with reference to FIG. 6. FIG. 6 shows a case where the predetermined imaging start position set in step S501 is a position where the distance between the radiation irradiator 101 and the radiation detector 105 is L. 2 In step S506, the image processor 110 converts the dose information signal S 2,i,j For each pixel and for all pixels, is divided by the radiation amount information at the corresponding pixel position as shown in (Equation 6) below.

number

[0052] At this time, the coefficient of the quadratic function in the denominator is determined in step S207. 2,i,j , y' 2,i,j is determined based on internal position information of the radiation imaging device 102. At that time, setting information regarding the rotational motion acquired in advance is also referenced, and a correction according to the rotational state is also performed. By performing a correction taking into account the rotational state, it is possible to obtain more accurate dose information.

[0053] In step S508, the image processor 110 calculates the dose information signal P 2,i,j The image is subjected to image processing such as gradation processing and noise reduction processing.

[0054] In step S509, the image processing unit 110 transmits the signal after image processing to the image display unit 112, and the image display unit 112 displays the transmitted radiation image.

[0055] In step S510, the radiation imaging device 102 checks whether or not an imaging end signal has been received. The imaging end signal is sent from the imaging control unit 104. Since imaging is continuous, if there is no imaging end signal from the imaging control unit 104 at the end of a series of processes from step S505 to step S509, the flow returns to step S505, and the above-described processes starting from the accumulation of dose information signals are repeatedly performed.

[0056] By carrying out the above-described process, the position information acquisition unit 107 can obtain the position information of the radiation imaging device 102 for each imaging operation during continuous imaging. Therefore, even if the radiation imaging device 102 is rotating, the process of correcting image nonuniformity using the position information at each time in step S507 is possible. If there is an imaging end signal, the flow proceeds to the next step S511.

[0057] In step S511, the imaging control unit 104 transmits an imaging end signal to the radiation imaging device 102 and at the same time controls the radiation irradiation unit 101 to stop the radiation irradiation. Similarly, at the same time as transmitting the imaging end signal, the position control mechanism 113 stops the rotation operation of the radiation imaging device 102.

[0058] In step S512, after the rotation operation is stopped, the imaging control unit 104 transmits an acceleration detection stop signal to the position information acquisition unit 107. Upon receiving the acceleration detection stop signal, the position information acquisition unit 107 switches the acquired position information to external position information in the position information acquisition method switching unit 109. At that time, the position calculation unit 108 stops calculation of the position information from the acceleration detection unit 106. Note that the acceleration detection unit 106 does not acquire internal position information of the radiation imaging device 102 until an acceleration detection start signal is transmitted to the position information acquisition unit 107. Therefore, the external position information may be obtained from the imaging control unit 104 at any timing during this period. When the acquired position information is switched, the flow is shifted and the continuous imaging process is terminated.

[0059] The acceleration sensor constantly accumulates changes in gravitational acceleration during operation, and accumulates the changes in the form of noise due to the influence of gravitational acceleration, noise, etc. even when the radiation imaging device 102 is stopped. For this reason, when an acceleration sensor is used as a means for obtaining internal position information, the amount of accumulated noise varies depending on the timing of receiving an acceleration detection start signal, and it is not easy to obtain accurate position information of the radiation imaging device 102 as desired in this disclosure. In contrast, the external position information obtained from the position control mechanism 113 accurately indicates the position of the radiation imaging device 102. Also, for example, when radiation detection is performed continuously while the radiation imaging device 102 is rotating, more accurate position information can be obtained by adding setting information for the rotation operation.

[0060] In the present disclosure, the position information of the radiation imaging device 102 immediately before the acceleration detection start signal is output is obtained from the position detection unit 113a of the position control mechanism 113. Then, the acceleration measurement by the acceleration sensor is started from the position of the radiation imaging device 102 obtained from the obtained position information. Therefore, the accumulated noise of the acceleration sensor at the timing when the acceleration sensor starts outputting the raw information on the position is substantially zero. Therefore, by performing the above-described process, the influence of the noise accumulation of the acceleration sensor generated when the radiation imaging device 102 is stopped is reduced, and the detection position deviation when performing continuous imaging again can be reduced. In addition, since the information on the position at the start of detection is highly accurate, the accuracy of the internal position information obtained each time based on the output of the acceleration sensor is also high. Therefore, according to the first embodiment of the present disclosure, the amount of noise accumulated in the acceleration sensor can be reduced by switching the information on the position to be obtained in accordance with the operation of the imaging control unit 104. As a result, even when the radiation imaging device 102 and the imaging control unit 104 cannot perform bidirectional communication during continuous imaging, for example, when continuous imaging is being performed, it is possible to appropriately correct image nonuniformity in real time.

[0061] In this embodiment, an example is shown in which an acceleration sensor is used to obtain internal position information. However, the application of the present disclosure is not limited to an acceleration sensor, and the present disclosure can also be applied to various known methods for obtaining position information. As described above, by applying the present disclosure, highly accurate external position information is normally obtained, and internal position information can be generated based on external position information obtained immediately before two-way communication becomes impossible due to continuous shooting. This makes it possible to effectively suppress non-uniformity in images caused by the distribution of radiation irradiated by a radiation irradiation device in real time using highly accurate position information even during continuous shooting.

[0062] <Second embodiment> In the second embodiment described below, in addition to the configuration described in the first embodiment, in order to further improve the accuracy of the internal position information, internal position information is accumulated during continuous shooting. The accumulated internal position information is then used to correct the internal position information for the next and subsequent continuous shootings. The following description of the second embodiment will focus on the differences from the first embodiment.

[0063] (Acquisition of information necessary for correction) In the first embodiment, after the turning operation is stopped in step S512, an acceleration detection stop signal is transmitted from the shooting control unit 104 to the position information acquisition unit 107. In response to receiving the acceleration detection stop signal, the position calculation unit 108 stops acquiring information related to the position from the acceleration detection unit 106 and calculating the information related to the position.

[0064] In this embodiment, immediately before the position calculation in the position calculation unit 108 is stopped by the acceleration detection stop signal, the internal position information obtained when the continuous shooting is stopped is stored in the storage unit 111. At the same time, the setting information of the turning operation transmitted from the shooting control unit 104 is linked to the external position information obtained by the position control mechanism when the continuous shooting is stopped, and this is stored in the storage unit 111 as data for position information correction calculation. After storing the data for position information correction calculation stored in the storage unit 111, the position calculation unit 108 performs a position information correction value calculation to obtain, for example, a correction value for making the internal position information correspond to the external position information at any timing other than during the execution of the continuous shooting. At that time, the setting information regarding the turning motion acquired in advance is also referred to, and this setting information can also be used for the position information correction value calculation. By performing a correction in consideration of the turning state for the position information correction calculation, it is possible to obtain a correction value with higher accuracy.

[0065] In this embodiment, an example is described in which a three-axis acceleration sensor that outputs acceleration in each axis direction in a three-axis Cartesian coordinate system is used as the acceleration detection unit 106. Here, the sensor that obtains information about the position is not limited to the one exemplified here. For example, there is an IMU that combines an acceleration sensor with a gyro sensor that can detect the direction of rotation (angular velocity). In the present disclosure, this may be used as a sensor that obtains information about the position. Note that when an IMU is used, angular velocity information obtained from the gyro sensor of the acceleration detection unit 106 may be obtained in addition to data for position information correction calculation.

[0066] (Overview of correction method) In the first embodiment, the position information acquired by the plane inspection device is switched. In addition, when external position information is used, the acceleration detection unit 106 avoids a state in which it continues to store position information, reducing noise accumulation in the acceleration sensor and thereby reducing the detected position deviation.

[0067] However, even if noise integration is eliminated when the radiation imaging device 102 is stopped and external position information is acquired, noise accumulation by the acceleration sensor occurs during rotational motion for continuous imaging. Therefore, although the amount of noise accumulation is small compared to noise accumulation when the radiation imaging device 102 is stopped, a detected position shift of the internal position information occurs due to this noise accumulation. In this embodiment, a further object is to reduce the detected position shift during rotational motion.

[0068] Here, the internal position information at the end of the turning operation, which is acquired after the processing of step S512 in the first embodiment described above and stored in the memory unit 111, is denoted as A. Similarly, the external position information acquired by the position control mechanism 113 at the end of the turning operation and linked to the setting information of the turning operation is denoted as B. At this time, if the internal position information A includes a detected position deviation caused by noise accumulation during the turning operation, a difference will occur between the internal position information A and the external position information B. Since the internal position information A and the external position information B can be represented by three axes (X, Y, Z) of a Cartesian coordinate system, the difference can also be represented by each of the three axes of the Cartesian coordinate system.

[0069] In this embodiment, the above correction method is executed by the user selecting a mode for correcting the internal position information via, for example, the imaging condition setting unit 103. Specifically, first, the internal position information correction mode is selected by the user. The imaging condition setting unit 103 transmits an instruction to execute the internal position information correction mode to the radiation imaging device 102 via the imaging control unit 104. In response to the instruction, the position information acquisition method switching unit 109 repeats switching of the acquired position information from external position information to internal position information and from internal position information to external position information multiple times according to a preset time interval and number of times. Then, the position information acquisition unit 107 calculates the accumulated noise expected to be included in the internal position information during continuous imaging based on the obtained multiple differences and calculates a value for correcting the noise.

[0070] According to this embodiment, the internal position information of the same turning motion from the next time onward is corrected using the obtained multiple differences, and the detected position deviation due to noise accumulation occurring during continuous shooting can be reduced. Note that various known methods can be used to correct the position information, and for example, the average of each of the obtained differences of the three axes of the Cartesian coordinate system may be calculated, and the internal position information may be offset using the average difference.

[0071] In addition, when acquiring the internal position information, angular velocity information obtained from the gyro sensor of the acceleration detection unit 106 may be acquired at the same time and used to correct the internal position information. In this case, the angular velocity information may be acquired in the same manner as the internal position information. Here, the angular velocity information obtained from the gyro sensor is referred to as internal orientation information C. The internal orientation information C can be used in a calculation for determining a correction value used for correcting the internal position information. For example, the internal orientation information C can be used as the orientation information of the radiation imaging device 102 in a calculation for referring to the influence of the gravitational acceleration on each of the three axes of a Cartesian coordinate system and adding this to the internal position information correction value. By taking such internal orientation information C into consideration when calculating the internal position information correction value, a more accurate correction value can be obtained.

[0072] In this embodiment, the external position information is used to correct the detection position deviation that may be included in the internal position information at the end of the continuous imaging, thereby reducing the detection position deviation of the radiation imaging device 102 that occurs during the rotation operation.

[0073] As described above, the radiation imaging device 102 according to an embodiment of the present disclosure includes a radiation detection means, a position information acquisition means, a switching means, and an image processing means. In the embodiment, the radiation detection unit 105 functioning as an example of a radiation detection means detects radiation irradiated from the radiation irradiation unit 101 functioning as an example of a radiation irradiation means. The position information acquisition unit 107 functioning as an example of a position information acquisition means acquires position information of the radiation detection unit 105 from a plurality of position information detection means. In the present disclosure, examples of the plurality of position information detection means include an acceleration detection unit 106 exemplified by an acceleration sensor, and a position detection mechanism (position detection unit 113a) formed of, for example, a known linear scale or the like provided in the position control mechanism 113. The position control mechanism 113 supports the radiation imaging device 102 so that it can be driven. The position information acquisition method switching unit 109 functioning as an example of a switching means switches the position information detection means from which the position information acquisition unit 107 acquires position information according to a state related to radiation detection by the radiation detection unit 105. The image processing unit 110, which functions as an example of an image processing means, generates a radiographic image of a subject that has been irradiated with radiation, based on an image signal obtained from radiation detected by the radiation detection unit 105. The image processing unit 110 then corrects the image signal based on the detected radiation for the generated image, using three-dimensional dose distribution information related to the radiation irradiated from the radiation irradiation unit 101 to the radiation detection unit 105 and the acquired position information.

[0074] The radiation imaging device 102 according to the present disclosure can be instructed to be drivable by a position control mechanism 113 that functions as an example of a position control means for controlling the position of the radiation detection means relative to the radiation. At least one of the multiple position information detection means is provided in the position control means as, for example, a position detection unit 113a, and can output external position information as position information or original information of the position information. In addition, the acceleration detection unit 106, which is at least one of the multiple position information detection means, is provided integrally with the radiation detection unit 105 and can output internal position information as position information. As described above, a known position sensor or the like can be used for the configuration that outputs the external position information. In addition to the acceleration sensor exemplified, various sensors that are provided in the complementary plane detector and can output the position information of the plane detector can be applied to the configuration that outputs the internal position information.

[0075] The position information acquisition method switching unit 109 can determine whether the state is a period from when the radiation detection unit 105 starts to detect radiation that has passed through the subject until it ends, or a period other than that. Whether the state is a period from when the radiation detection unit 105 starts to detect radiation that has passed through the subject until it ends, as described here, or a period other than that, can be determined based on the set imaging conditions. Alternatively, whether the state is a period from when the radiation detection unit 105 starts to detect radiation until it ends, or a period other than that, can be determined based on whether or not the user is performing any operation. In addition, the radiation imaging device 102 according to the present disclosure can further include a notification unit that notifies the user from which of the multiple position information detection units the position information acquisition unit 107 is acquiring position information. In the present disclosure, the image display unit 112 functions as an example of a notification unit, and can notify the user of the acquired position information on the operation screen.

[0076] Also, as described in the second embodiment, the internal position information can be corrected by external position information. In this case, in the present disclosure, the radiation imaging device 102 can further include a storage unit that stores internal position information based on the output of the position information detection unit (acceleration detection unit 106) and external position information based on the output of the position control mechanism 113, as exemplified by the storage unit 111, for example. More specifically, the position information acquisition unit 107 can correct the stored internal position information by using the stored external position information. Also, in the present disclosure, the radiation imaging device 102 may perform radiation detection while moving, for example, by a rotation operation by the position control mechanism 113 about the axis of the radiation irradiation direction. In this case, the storage unit 111 can also store the set position information of the radiation detection means output by the position control mechanism 113 to control (move) the position of the radiation detection means relative to the radiation. In this case, the position information acquisition unit 107 can also correct the stored internal position information by using the stored set position information.

[0077] The plurality of position information detection means may further include a means for detecting an angular velocity of the radiation imaging device 102. In this case, the above-mentioned storage unit 111 may store internal acceleration information output from an acceleration sensor provided in the radiation imaging device 102 integrally with the radiation detection unit 105, and internal angular velocity information output from a means for detecting angular velocity. The image processing unit 110 then corrects the image signal using the stored external position information, the stored internal acceleration information, and the stored internal angular velocity information. The storage unit 111 may also store three-dimensional dose distribution information related to the radiation irradiated from the radiation irradiation unit 101 to the radiation imaging device 102. The image processing unit 110 then corrects the image signal based on the detected radiation using the stored three-dimensional dose distribution information.

[0078] The radiation imaging device 102 according to the present disclosure may include radiation detection means and means for acquiring internal information, and may be supported by position control means. In the embodiment, the radiation detection unit 105, which functions as an example of radiation detection means, detects radiation irradiated from the radiation irradiation unit 101, which functions as an example of radiation irradiation means. The position control mechanism 113, which functions as an example of position control means, controls the position of the radiation detection unit 105 (radiation imaging device 102) relative to the radiation, and outputs external position information related to the position of the radiation detection unit 105. The position information acquisition unit 107 according to the present disclosure acquires internal position information related to the position of the radiation detection unit 105 from an acceleration sensor (acceleration detection unit 106) provided integrally with the radiation detection unit 105. The image processing unit 110, which functions as an example of image processing means, acquires an image signal based on the radiation detected by the radiation detection unit 105. In the radiation imaging device 102 according to the present disclosure, in response to detection of radiation by the radiation detection unit 105, acquisition of internal position information is started using external position information acquired from the position detection unit 113a included in the position control mechanism 113 as a reference. More specifically, when radiation detection is started, the acquired position information is switched from external position information to internal position information, and at that time, accumulation of position information by the acceleration sensor is started using the position of the radiation detection unit 105 acquired from the external position information as a reference. As a result, accumulation of information that is the basis of position information from a state in which the acceleration sensor is almost initialized at the time of switching of position information is started, and the influence of accumulated noise is reduced. The image processing unit 110 corrects the image signal using three-dimensional dose distribution information related to radiation irradiated from the radiation irradiation unit 101 to the radiation detection unit 105 and the acquired internal position information.

[0079] In addition, one aspect of the present disclosure can also be used to construct a radiation imaging system. The radiation imaging system 100 illustrated includes a radiation irradiation means, a control means, and the above-mentioned radiation imaging device. In the embodiment, a radiation irradiation unit 101 is illustrated as an example of the radiation irradiation means. An imaging control unit 104 illustrated as an example of the control means is communicably connected to the radiation irradiation unit 101 and controls the radiation irradiation unit 101. The radiation imaging device is exemplified by the above-mentioned radiation imaging device 102, which is communicably connected to the imaging control unit 104.

[0080] (Other embodiments) The present disclosure can also be realized by a process in which a program for realizing one or more functions of the above-mentioned embodiments is supplied to a system or device via a network or a storage medium, and one or more processors in the computer of the system or device read and execute the program. It can also be realized by a circuit (e.g., ASIC) for realizing one or more functions. In addition, various recording media can be used, such as a flexible disk, an optical disk (e.g., CD-ROM, DVD-ROM), a magneto-optical disk, a magnetic tape, a non-volatile memory (e.g., USB memory), a ROM, etc. In addition, a program for implementing the above-mentioned functions may be downloaded via a network and executed by a computer.

[0081] In addition, the functions of the above-mentioned embodiments are not limited to being realized only by a computer executing the read program code, but also include cases where an operating system (OS) running on a computer performs part or all of the actual processing based on instructions from the program code, thereby realizing the functions of the above-mentioned embodiments.

[0082] Furthermore, the program code read from the recording medium may be written to a memory provided in a function expansion board inserted into a computer or a function expansion unit connected to a computer. This also includes cases where a CPU or the like provided in the function expansion board or function expansion unit performs part or all of the actual processing based on the instructions of the program code, thereby realizing the above-mentioned functions.

[0083] As described above, according to the present disclosure, when performing continuous imaging using a radiation imaging system using a flat detection plate, the position information used for image correction is switched from external position information to internal position information before the start of continuous imaging. Also, during continuous imaging, detection of internal position information is started by referring to the external position information immediately before the start of continuous imaging. This makes it possible to correct radiation images during continuous imaging using more accurate position information without performing two-way communication. Therefore, it is possible to obtain accurate position information by a simpler method and obtain corrected radiation images suitable for examination.

[0084] The above disclosure includes the following configurations, methods, and programs. (Configuration 1) a radiation detection means for detecting radiation irradiated from the radiation irradiating means; a position information acquiring means for acquiring position information of the radiation detection means from at least one of a plurality of position information detecting means; a switching means for switching between position information detection means for acquiring the position information according to a state related to the detection of the radiation by the radiation detection means; an image processing means for correcting an image signal based on the detected radiation, using three-dimensional dose distribution information regarding the radiation irradiated from the radiation irradiating means to the radiation detecting means and the acquired position information; A radiation imaging apparatus comprising: (Configuration 2) a position control means for controlling a position of the radiation detection means relative to the radiation; 2. The radiation imaging apparatus according to configuration 1, wherein at least one of the plurality of position information detection means is provided in the position control means and outputs external position information as the position information. (Configuration 3) 3. The radiation imaging apparatus according to configuration 1 or 2, wherein at least one of the plurality of position information detecting means is provided integrally with the radiation detecting means and outputs internal position information as the position information. (Configuration 4) 4. The radiation imaging apparatus according to configuration 3, wherein the position information detecting means provided integrally with the radiation detecting means includes an acceleration sensor. (Configuration 5) 5. The radiation imaging device according to any one of configurations 1 to 4, wherein the switching means switches the position information detection means for acquiring the position information depending on whether the radiation detection means is in a state from when it starts to when it finishes detecting radiation that has passed through a subject. (Configuration 6) 6. The radiation imaging apparatus according to configuration 5, wherein whether the state is during a period from start to end of radiation detection or a state other than the period is determined based on set imaging conditions. (Configuration 7) The radiation imaging device according to configuration 5, wherein whether the state is during a period from start to end of the radiation detection or a state other than the period is determined based on whether or not a user is performing any operation. (Configuration 8) 8. The radiation imaging apparatus according to any one of configurations 1 to 7, further comprising a notification unit that notifies a user of from which of the plurality of position information detection units the position information acquisition unit has acquired the position information. (Configuration 9) a storage unit that stores internal position information acquired by the position information acquisition means and output from a position information detection means that is provided integrally with the radiation detection means, and external position information of the radiation detection means that is output from a position control means that controls a position of the radiation detection means with respect to the radiation, 9. The radiation imaging apparatus according to any one of configurations 1 to 8, wherein the position information acquisition means corrects the stored internal position information by using the stored external position information. (Configuration 10) the storage unit further stores set position information of the radiation detection means outputted by the position control means in order to control the position of the radiation detection means with respect to the radiation; 10. The radiation imaging apparatus according to configuration 9, wherein the position information acquisition means corrects the stored internal position information by using the stored set position information as well. (Configuration 11) 11. The radiation imaging apparatus according to any one of configurations 1 to 10, wherein the plurality of position information detection means include a means for detecting an angular velocity of the radiation detection means. (Configuration 12) the radiation detection means is provided with a position information detecting means that detects an acceleration of the radiation detection means and outputs the internal acceleration information; the radiation detection means is provided with a position information detecting means that detects an acceleration of the radiation detection means and outputs the internal angular velocity information; and the radiation detection means is provided with a position information detecting means that detects an angular velocity of the radiation detection means and outputs the external position information of the radiation detection means from a position control means that controls a position of the radiation detection means with respect to the radiation, 12. The radiation imaging device according to any one of configurations 1 to 11, wherein the image processing means corrects the image signal using the stored external position information, the stored internal acceleration information, and the stored internal angular velocity information. (Configuration 13) a storage means for storing three-dimensional dose distribution information regarding the radiation irradiated from the radiation irradiating means to the radiation detecting means, 13. The radiation imaging apparatus according to any one of configurations 1 to 12, wherein the image processing means corrects an image signal based on the detected radiation by using the stored three-dimensional dose distribution information. (Configuration 14) a radiation detection means for detecting radiation irradiated from the radiation irradiating means; a means for acquiring internal position information relating to a position of the radiation detection means, the means being integrally provided in the radiation detection means; a position control means for controlling a position of the radiation detection means relative to the radiation; a radiation imaging device in which, in response to detection of the radiation by the radiation detection means, acquisition of the internal position information is started using external position information acquired from the position control means as a reference, and the image processing means corrects the image signal using three-dimensional dose distribution information regarding the radiation irradiated from the radiation irradiation means to the radiation detection means and the acquired internal position information. (Configuration 15) 15. The radiation imaging apparatus according to configuration 14, further comprising image processing means for acquiring an image signal based on the detected radiation and generating a radiation image based on the image signal. (Configuration 16) The radiation irradiation means; a control means for controlling the radiation irradiation means, the control means being communicatively connected to the radiation irradiation means; A radiation imaging apparatus according to any one of configurations 1 to 15, which is communicatively connected to the control means; A radiation imaging system comprising: (Method 1) detecting radiation irradiated from a radiation irradiating means by a radiation detecting means; acquiring position information of the radiation detection means from at least one of a plurality of position information detection means; switching a position information detection means for acquiring the position information in accordance with a state related to the detection of the radiation by the radiation detection means; correcting an image signal based on the detected radiation using three-dimensional dose distribution information regarding the radiation irradiated from the radiation irradiating means to the position information detecting means and the acquired position information; A method for controlling a radiation imaging apparatus comprising: (Method 2) detecting radiation irradiated from the radiation irradiating means by the radiation detecting means; controlling a position of the radiation detection means relative to the radiation by a position control means; acquiring internal position information relating to a position of the radiation detection means by a means provided in the radiation detection means; acquiring an image signal based on the detected radiation by an image processing means; a control method for a radiation imaging device, wherein, in response to detection of the radiation by the radiation detection means, acquisition of the internal position information is started using external position information acquired from the position control means as a reference, and the image processing means corrects the image signal using three-dimensional dose distribution information regarding the radiation irradiated from the radiation irradiation means to the radiation detection means and the acquired internal position information. (program) A program that, when executed by a processor, causes the processor to execute each step of the control method according to Method 1 or 2. [Explanation of symbols]

[0085] 100: Radiation imaging system 101: Radiation department 102: Radiation imaging device 103: Shooting condition setting section 104: Shooting control unit 105: Radiation detection unit 106: Acceleration detection unit 107: Location information acquisition unit 108: Position calculation section 109: Location information acquisition method switching section 110: Image processing unit 111: Storage section 112: Image display unit 113: Position control mechanism

Claims

1. a radiation detection means for detecting radiation irradiated from the radiation irradiating means; a position information acquiring means for acquiring position information of the radiation detection means from at least one of a plurality of position information detecting means; a switching means for switching between position information detection means for acquiring the position information according to a state related to the detection of the radiation by the radiation detection means; an image processing means for correcting an image signal based on the detected radiation, using three-dimensional dose distribution information regarding the radiation irradiated from the radiation irradiating means to the radiation detecting means and the acquired position information; A radiation imaging apparatus comprising:

2. a position control means for controlling a position of the radiation detection means relative to the radiation; 2. The radiation imaging apparatus according to claim 1, wherein at least one of the plurality of position information detection means is provided in the position control means and outputs external position information as the position information.

3. 2. The radiation imaging apparatus according to claim 1, wherein at least one of the plurality of position information detecting means is provided integrally with the radiation detecting means and outputs internal position information as the position information.

4. 4. The radiation imaging apparatus according to claim 3, wherein the position information detecting means provided integrally with the radiation detecting means includes an acceleration sensor.

5. 2. The radiation imaging apparatus according to claim 1, wherein the switching means switches the position information detection means for acquiring the position information depending on whether the radiation detection means is in a state from when it starts to when it finishes detecting radiation that has passed through the subject.

6. The radiation imaging apparatus according to claim 5 , wherein whether the state is during a period from start to end of radiation detection or a state other than the period is determined based on set imaging conditions.

7. The radiation imaging apparatus according to claim 5 , wherein whether the state is during a period from start to end of radiation detection or a state other than the period is determined based on whether or not a user is performing any operation.

8. 2. The radiation imaging apparatus according to claim 1, further comprising: a notifying unit that notifies a user of from which of the plurality of position information detecting units the position information obtaining unit has obtained the position information.

9. a storage unit that stores internal position information acquired by the position information acquisition means and output from a position information detection means that is provided integrally with the radiation detection means, and external position information of the radiation detection means that is output from a position control means that controls a position of the radiation detection means with respect to the radiation, The radiation imaging apparatus according to claim 1 , wherein the position information acquisition means corrects the stored internal position information by using the stored external position information.

10. the storage unit further stores set position information of the radiation detection means outputted by the position control means in order to control the position of the radiation detection means with respect to the radiation; The radiation imaging apparatus according to claim 9 , wherein the position information acquisition means corrects the stored internal position information by also using the stored set position information.

11. 2. The radiation imaging apparatus according to claim 1, wherein said plurality of position information detecting means include means for detecting an angular velocity of said radiation detecting means.

12. the radiation detection means is provided with a position information detecting means that detects an acceleration of the radiation detection means and outputs the internal acceleration information; the radiation detection means is provided with a position information detecting means that detects an acceleration of the radiation detection means and outputs the internal angular velocity information; and the radiation detection means is provided with a position information detecting means that detects an angular velocity of the radiation detection means and outputs the external position information of the radiation detection means from a position control means that controls a position of the radiation detection means with respect to the radiation, 2. The radiation imaging apparatus according to claim 1, wherein said image processing means corrects said image signal using said stored external position information, said stored internal acceleration information, and said stored internal angular velocity information.

13. a storage means for storing three-dimensional dose distribution information regarding the radiation irradiated from the radiation irradiating means to the radiation detecting means, 2. The radiation imaging apparatus according to claim 1, wherein said image processing means corrects an image signal based on said detected radiation by using said stored three-dimensional dose distribution information.

14. a radiation detection means for detecting radiation irradiated from the radiation irradiating means; a means for acquiring internal position information relating to a position of the radiation detection means, the means being integrally provided in the radiation detection means; a position control means for controlling a position of the radiation detection means relative to the radiation; a radiation imaging device in which, in response to detection of the radiation by the radiation detection means, acquisition of the internal position information is started using external position information acquired from the position control means as a reference, and the image processing means corrects the image signal using three-dimensional dose distribution information regarding the radiation irradiated from the radiation irradiation means to the radiation detection means and the acquired internal position information.

15. The radiation imaging apparatus according to claim 14 , further comprising an image processing unit that acquires an image signal based on the detected radiation and generates a radiation image based on the image signal.

16. The radiation irradiation means; a control means for controlling the radiation irradiation means, the control means being communicatively connected to the radiation irradiation means; The radiation imaging apparatus according to claim 1 , which is communicatively connected to the control unit; A radiation imaging system comprising:

17. detecting radiation irradiated from a radiation irradiating means by a radiation detecting means; acquiring position information of the radiation detection means from at least one of a plurality of position information detection means; switching a position information detection means for acquiring the position information in accordance with a state related to the detection of the radiation by the radiation detection means; correcting an image signal based on the detected radiation using three-dimensional dose distribution information regarding the radiation irradiated from the radiation irradiating means to the position information detecting means and the acquired position information; A method for controlling a radiation imaging apparatus comprising:

18. detecting radiation irradiated from the radiation irradiating means by the radiation detecting means; controlling a position of the radiation detection means relative to the radiation by a position control means; acquiring internal position information relating to a position of the radiation detection means by means of a means provided in the radiation detection means; a control method for a radiation imaging device, wherein, in response to detection of the radiation by the radiation detection means, acquisition of the internal position information is started using external position information acquired from the position control means as a reference, and the image processing means corrects the image signal using three-dimensional dose distribution information regarding the radiation irradiated from the radiation irradiation means to the radiation detection means and the acquired internal position information.

19. A program which, when executed by a processor, causes the processor to execute each step of the control method according to claim 17 or 18.

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