JP2015080644A - Radiographic apparatus, radiographic system, control method for radiographic apparatus and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate an image in which an artifact is small while reducing ineffective exposure of a patient.SOLUTION: A radiographic apparatus has: a radiation sensor disposed with a plurality of pixels on a matrix, and detecting radiation by the respective pixels to obtain a radiation image; a drive part bringing the plurality of pixels into a reading state in a line unit of one of a row and a column, and making detection drive for removing charges accumulated in the radiation sensor be executed; and a detection circuit detecting that the radiation is radiated on the radiation sensor on the basis of an electric signal outputted from the radiation sensor by the detection drive. The radiographic apparatus includes a setting part setting a photographic mode of the radiographic apparatus, and the drive part brings the pixels of each line into the reading state for a first time by the drive to remove the charges when the photographic mode of the radiographic apparatus is a first photographic mode for photographing a radiographic subject, and brings the pixels of each line into the reading state for a second time longer than the first time by the drive to remove the charges when the photographic mode is a second photographic mode for photographing a correction image in a state that the radiographic subject is absent.

Description

  The present invention relates to a radiation imaging apparatus, a radiation imaging system, a method for controlling the radiation imaging apparatus, and a program.

  Radiation is emitted from a radiation generator to a subject, a radiation image that is the intensity distribution of the radiation that has passed through the subject is photographed with a radiation imaging device, digitized, and the digitized radiation image is subjected to image processing to produce a clear radiation image Radiation imaging systems that generate

  Here, since the charge holding performance of each pixel of the radiation detection sensor varies, even if the same amount of radiation is received, the charge amount is different. Therefore, when receiving the same amount of radiation, it is necessary to perform image processing for normalization that converts the value to the same pixel value. Normalization processing is performed by creating image data (white image) when uniform radiation is applied to the radiation receiving surface in advance, and dividing each pixel value of the image before image processing by the corresponding pixel value of the white image To create a shot image. If there is an artifact in the white image, the artifact also occurs in the captured image. On the other hand, in Patent Document 1, a white image is created by blurring the distribution of the transmission unevenness of the radiation reflected when creating a white image by leveling processing.

  In addition, as a technique for adjusting the timing of radiation generation and imaging, a method of communicating between the radiation generation apparatus and the radiation imaging apparatus, or imaging immediately after detecting radiation with the radiation imaging apparatus, the radiation generation apparatus and the radiation imaging apparatus A system as disclosed in Patent Document 2 that does not perform communication between the two has been developed. In Patent Document 2, detection driving for sequentially reading out pixels of a sensor for each line is performed until radiation is detected by a radiation imaging apparatus. When radiation is detected during detection driving, detection driving is immediately interrupted, the sensor is shifted to an accumulation state, and an X-ray image can be obtained.

JP 2009-291548 A JP 2007-151761 A

  However, in the detection drive, if the pixel readout time of each line is shortened, the depth of the artifact scratch on each line is reduced, but the number of lines on which the artifact occurs is increased. On the other hand, if the pixel readout time for each line is lengthened, there is a problem in that the depth of artifact scratches on each line increases.

  In view of the above problems, the present invention performs imaging after detecting radiation with a radiation imaging apparatus, and in a method in which communication is not performed between the radiation generation apparatus and the radiation imaging apparatus, while reducing the invalid exposure of the patient, The objective is to reduce the effects of artifacts.

The radiographic apparatus according to the present invention that achieves the above object is as follows.
A plurality of pixels are arranged in a matrix, a radiation sensor that detects radiation by each pixel and obtains a radiation image, and the plurality of pixels are read out in units of lines of either rows or columns and stored in the radiation sensor. Driving means for executing detection driving for removing the charged charges;
A detection circuit that detects that the radiation sensor is irradiated with radiation based on an electrical signal output from the radiation sensor by the detection drive, and a radiation imaging apparatus comprising:
Comprising setting means for setting an imaging mode of the radiation imaging apparatus;
When the imaging mode of the radiation imaging apparatus is a first imaging mode for imaging a subject, the driving means sets the pixels of each line to a first time readout state by driving to remove the charge,
When the shooting mode is the second shooting mode for shooting a corrected image in the absence of a subject, the pixels of each line are longer than the first time by driving to remove the charge. It is characterized in that it is in a state of reading for a period of time.

  According to the present invention, imaging is performed after radiation is detected by a radiation imaging apparatus, and in the method in which communication is not performed between the radiation generation apparatus and the radiation imaging apparatus, the influence of the artifact is reduced while reducing the invalid exposure of the patient. Can be reduced.

The timing chart of the sensor drive concerning a 1st embodiment. The figure which shows the structural example of the radiography system which concerns on 1st Embodiment. The timing chart of the sensor drive concerning a 1st embodiment. The figure which shows the difference of the artifact by the difference in the idle reading time which concerns on 1st Embodiment. The figure which shows an example of the correction method of the artifact which concerns on 1st Embodiment. The flowchart which shows the procedure of the process which the radiography apparatus which concerns on 1st Embodiment implements. The figure which shows an example of the sensor in the radiography apparatus which concerns on 1st Embodiment. The timing chart of the sensor drive concerning a 2nd embodiment. The timing chart of the sensor drive concerning a 2nd embodiment. The figure which shows an example of the sensor in the radiography apparatus which concerns on 2nd Embodiment.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

(First embodiment)
In general, a radiation imaging apparatus is configured by laminating a phosphor on a pixel including a photoelectric conversion element or the like. The radiation imaging apparatus converts radiation to visible light with a phosphor, holds visible light as a charge, and forms an image from the read charge amount. Even when radiation is not received, the charge of each pixel increases due to the influence of dark current and the like. If the charge remains increased, the dynamic range of the image will be narrowed, so a process for periodically removing the charge is required. Sensor driving performed to remove charges is referred to as idle reading driving (detection driving). In addition, sensor driving performed to read out the charge value in order to form an image is referred to as main reading driving (imaging driving).

  FIG. 7 shows an example of a radiation sensor in the radiation imaging apparatus. The radiation sensor is configured by arranging a plurality of pixels on a matrix, and detects radiation by each pixel to obtain a radiation image. Pixels on a certain row on the two-dimensional sensor array are all addressed simultaneously by the drive circuit 702, and the charge of each pixel on the row is held in the sample hold circuit 703. Thereafter, the held charge of the pixel output is sequentially read out through the multiplexer 704, amplified by the amplifier 710, and then converted into a digital value by the A / D converter 711. Each time scanning of each row is completed, the drive circuit 702 sequentially drives and scans each next row on the two-dimensional sensor array, and finally, the charges of all the pixel outputs are converted into digital values. Thereby, radiation image data can be read. At this time, scanning is performed while fixing the voltage applied to each column signal line to a specific value, and by discarding the acquired charges, dark charges are discharged, and scanning for sensor initialization is performed. These controls are performed by the drive control unit 720.

  The drive control unit 720 controls the drive circuit 702 to set a plurality of pixels in a reading state in either row or column units (line units), and executes driving for removing charges accumulated in the radiation sensor. Let

  The irradiation detection unit 730 functions as a detection circuit that detects that radiation has been irradiated to the radiation sensor based on an electrical signal output from the radiation sensor by driving the drive circuit 702.

  The mode setting unit 740 sets an imaging mode of the radiation imaging apparatus and transmits the imaging mode to the drive control unit 720. When the imaging mode of the radiation imaging apparatus set by the mode setting unit 740 is the first imaging mode for imaging the subject, the drive control unit 720 performs driving for removing charges for each line. Let it be in the time reading state. When the shooting mode is the second shooting mode for shooting a corrected image in a state where there is no subject, the driving for removing charges is performed for a second time reading state longer than the first time for each line. Let it be done. Obtaining a captured image from which unnecessary dark charge components have been removed by performing offset correction by subtracting offset image data acquired from only dark charge components without irradiating radiation from the radiation image data converted into digital values Can do.

  As shown in FIG. 1, short idle reading driving is repeated while changing the driving lines in order (210 to 216). At this time, all the pixels on the same line are simultaneously driven for idle reading. More specifically, the current generated by the irradiation of radiation when the idle reading is repeated is detected, the radiation is detected, the idle reading is stopped after the detection, the charge accumulation is performed, and the main reading drive is performed after the accumulation ( 220 to 225) A method for forming an image. After the radiation irradiation, the radiation is detected at timing 216, the idle reading is stopped, and the charge accumulation mode is entered.

  Lines 1, 2, and 6 that are not idle-reading after irradiation are accumulated during the entire 201 period of irradiation. However, the lines 3, 4, and 5 in which the idle reading drive was performed after the radiation was detected until the idle reading was stopped, the charge corresponding to the irradiation before the idle reading drive is removed. The charge accumulation time corresponding to irradiation is T2, T3, and T4, which is shorter than T1. Therefore, a plurality of rows having pixel values smaller than normal pixel values are generated (230 to 235).

  As shown in Fig. 1, in the case of idle reading drive with a short idle reading time of one line, the difference between T2, T3, T4 and T1 is small, so the difference in pixel value is small, and artifacts are visible in normal shooting. It is possible to make it impossible. However, even if it is an invisible artifact, if a normal subject photographed image is normalized using an image having an artifact in a white image, a visible artifact may occur.

  Further, FIG. 3 shows a case where the idle reading drive time for one line is longer than that in FIG. After the radiation is detected, the idle reading is stopped (311, 312), charge accumulation is performed, and after the accumulation, the main reading drive is performed (320 to 325) to form an image. In the example of FIG. 3, the number of rows for which the idle reading drive is performed after the irradiation is reduced, and in the example of FIG. 3, only one row is removed from the charge corresponding to the irradiation (line 2). However, since the target line has a very small pixel value compared to the normal value (see 331 out of 330 to 335), this line becomes an artifact unless corrected with other pixels. End up.

  FIG. 4A is a diagram illustrating the relationship between the acquired image line and the pixel value when the idle reading drive of one line is repeatedly performed for a short time. The difference between the normal pixel value and the pixel value for which the idle reading drive is stopped is small, which affects a plurality of lines. On the other hand, FIG. 4B is a diagram illustrating the relationship between the acquired image line and the pixel value when the idle reading drive of one line having a long time is repeatedly performed. Although the difference between the normal pixel value and the pixel value for which the idle reading drive is stopped is large, the number of affected lines is small.

  Hereinafter, with reference to FIG. 2, a configuration example of the radiation imaging system according to the embodiment of the present invention will be described. The radiation imaging system includes a radiation imaging apparatus 101, a console 102 that controls the radiation imaging apparatus 101, and a radiation generation apparatus 103 that generates radiation.

  The radiation imaging apparatus 101 includes a sensor driving unit 110, a radiation detection unit 111, an imaging mode determination unit 112, and a communication unit 113.

  The sensor driving unit 110 drives a sensor inside the radiation imaging apparatus. The radiation detection unit 111 monitors the current generated in the radiation imaging apparatus 101 when receiving radiation, and determines that radiation has been irradiated when the threshold is reached.

  The imaging mode determination unit 112 determines whether the imaging mode of the radiation imaging apparatus 101 is a white image capturing mode for capturing a white image, or a normal imaging mode for capturing a subject and acquiring a radiation image. The white image is image data obtained when uniform radiation is irradiated on the radiation receiving surface of the sensor in advance without a subject. Normalization processing is performed by performing calibration by dividing each pixel value of the pre-image image taken with the subject by the corresponding pixel value of the white image, correcting variations in gain value for each pixel, and radiation An image is generated. The communication unit 113 communicates with the console 102.

  Here, FIG. 6 is a flowchart showing an example of a processing procedure in the radiation imaging system according to the embodiment of the present invention.

  When performing radiation imaging, the imaging mode determination unit 112 determines whether or not it is a white image imaging mode in which a white image is captured (S601). When the white image shooting mode is not set, it is determined that the normal shooting mode is set for shooting the subject. If it is determined that the mode is the white image shooting mode, the sensor driving unit 110 repeatedly performs the idle reading drive with a long one-line idle reading drive time (S602). The idle reading drive time for one line at this time is set to be longer than the time until the current for detecting radiation reaches the threshold value. This time may be measured in advance, or a value measured and measured each time may be used. Further, the shooting mode may be determined based on a result of the user selection by accepting a user selection of the white image shooting mode or the normal shooting mode. Alternatively, a sensor that detects the presence of a subject may be provided, the presence or absence of the subject may be determined from the detection result of the sensor, and the determination result may be used.

  On the other hand, when it is determined that the normal imaging mode in which the normal radiation imaging for imaging the subject is performed instead of the white image imaging, the sensor driving unit 110 repeatedly performs the idle reading driving with a short time for the idle reading driving of one line. (S603).

  Next, when the radiation detection unit 111 detects radiation during the idle reading drive (S604; Yes), the sensor driving unit 110 stops the idle reading drive and shifts to the accumulation mode (S605). On the other hand, when the radiation detection unit 111 does not detect radiation during the idle reading drive (S604; No), the process returns to S601 and continues the idle reading drive.

  The radiation imaging apparatus 101 performs the main reading drive after the accumulation mode ends, reads out the accumulated charges, and generates an image (S606).

  Next, the communication unit 113 transfers the generated image to the console 102 (S607). At this time, the number information of the line where the idle reading is stopped is also transmitted to the console 102.

  The console 102 that has received the image determines whether the image is captured in the white image capturing mode (S608). When it is determined that the image is white image shooting (S608; Yes), white image artifact correction processing is performed based on the information of the line number where idle reading is stopped (S609), and the created image is saved (S611). On the other hand, when it is determined that the image is not white image shooting (S608; No), normalization is performed using the stored white image, image correction is performed (S610), and the created image is stored (S611). Thereafter, the process ends.

  With reference to FIG. 5, an example of the artifact correction process of S609 executed by the console 102 will be described. A line of artifacts 502 occurs in the acquired white image 501. The line in which the artifact is generated is the line number at which the idle reading is stopped, and since the information of this line number is transmitted from the radiation imaging apparatus 101 to the console 102, the console 102 knows the correction target line.

  520 is an enlarged part of the pixel. It is assumed that the pixel 510 and the pixel 512 are normal pixel values in which no artifact is generated, and the pixel values are A and C, respectively. Here, the pixel 511 is a pixel in a row where idle reading is stopped, and has a smaller pixel value than a normal pixel value.

  The average of the two pixel values of the pixel in the same column of the row number before stopping and the pixel in the same column of the next row after the stopped row, which is not read idle during radiation irradiation, is the value B of the pixel 511 . Similarly, correction is performed for all the pixels of the row number where idle reading is stopped. In this way, based on the line number information, correction processing is performed in which the average value of the lines before and after the line where the idle reading drive is stopped is used as the pixel value of the line.

  Note that the method of detecting radiation may not be a method of monitoring current. Further, the idle reading drive time for one line may be set to a different value instead of the time until the current for detecting radiation exceeds the threshold value. Further, the present invention can be applied even when an artifact of a plurality of lines is generated instead of an artifact of only one line. Further, the image correction to be normalized using the white image may be performed by the radiation imaging apparatus instead of the console.

    As described above, in the case of white image shooting for acquiring the characteristic correction information of each pixel, shooting is performed after driving with a long initialization time (empty reading driving with a long readout time) of each pixel, In normal photographing for photographing a subject, photographing is performed after repeating driving with a short initialization time for each pixel (empty reading driving with a short readout time).

  This makes it possible to reduce the number of lines in which artifacts occur in the case of capturing a white image, and to reduce the “scratch depth” in the lines in which artifacts occur in the case of capturing a radiographic image. . Therefore, according to the present embodiment, imaging is performed after radiation is detected by the radiation imaging apparatus, and even in a method in which synchronous communication is not performed between the radiation generation apparatus and the radiation imaging apparatus, while reducing the invalid exposure of the patient The effect of artifacts can be reduced.

  Also, by varying the drive time of each line in the detection drive in the first shooting mode (subject shooting mode) and the detection drive in the second shooting mode (white image shooting mode), artifacts corresponding to the shooting mode can be changed. Adaptive control that reduces the influence becomes possible.

(Second Embodiment)
In the first embodiment, an example in which driving is performed in the order of adjacent lines has been shown as a method of controlling the lines to be driven. Hereinafter, the second embodiment of the present invention will be described in detail with reference to FIGS.

  FIG. 10 shows an example of a radiation sensor in the radiation imaging apparatus according to the second embodiment. In the first embodiment, the same components as those of the radiation sensor described with reference to FIG. Unlike the first embodiment, the radiation sensor according to the second embodiment includes a selection unit 1010, an imaging region setting unit 1020, and an irradiation condition setting unit 1030.

  The selection unit 1010 selects a detection driving method by the drive circuit 702 based on at least one of the imaging region information set by the imaging region setting unit 1020 and the radiation irradiation condition set by the irradiation condition setting unit 1030. . The selection unit 1010 may perform selection according to the radiation irradiation condition corresponding to the imaging region.

  For example, when the radiation irradiation condition is low energy (low tube voltage) and long time (about 3 seconds), the selection unit 1010 selects detection driving for driving one line at a time. This is because if a plurality of lines are driven, the number of lines increases, and if the number of lines exceeds ½ of the total number of lines of the sensor, the number of lines in which artifacts continuously occur increases, making it difficult to correct the artifacts.

  Conversely, when the irradiation time is an extremely short time (10 msec or less) as the radiation irradiation condition, the selection unit 1010 selects detection driving for driving a plurality of lines. This is because it is possible to reduce the fact that it cannot be detected even after irradiation is completed because the time until detection is short.

  Further, the selection unit 1010 selects a detection drive for driving one line at a time when imaging part information indicates a part such as a breast and imaging is performed with low energy (low tube voltage) as a radiation irradiation condition. Further, when the imaging part information indicates a part to be imaged by short-time irradiation such as a child, an arm, and a hand, detection driving for driving a plurality of lines may be selected. The drive control unit 720 controls the operation of the drive circuit 702 according to the detection drive method selected by the selection unit 1010.

  The imaging part setting unit 1020 sets imaging part information. The imaging part information may be set, for example, by receiving input from the user in advance before imaging. The irradiation condition setting unit 1030 sets radiation irradiation conditions for radiation imaging. The radiation irradiation condition may be set, for example, by receiving an input from the user in advance before photographing.

  The operation of the radiation sensor having the above configuration will be described with reference to FIGS.

  FIG. 8 shows an example in which the drive circuit 702 is driven by skipping one drive order such as lines 1, 3, 5, lines 2, 4, 6,. Specifically, idle reading driving is performed for each line in the order of timings 801, 802, 803, 804, 805, and 806. The current generated by irradiation with radiation when the idle reading is repeated is monitored, the radiation is detected, the idle reading drive is stopped after the detection, and charge accumulation is performed. Then, after the charge is accumulated, the main reading drive is performed in the order of timings 811, 812, 813, 814, 815, and 816.

  In this case, the selection unit 1010 performs the first detection drive (corresponding to the main reading drive at timings 811 to 816) for performing the detection drive by the drive circuit 702 for the first time for each line, and the detection drive for each line. It is selected which of second detection driving (corresponding to idle reading driving at timings 801 to 806) to be executed for a second time shorter than the first time is executed.

  FIG. 9 shows an example in which the drive circuit 702 is driven in order of a plurality of lines. Lines 1 and 3 at a specific timing 901A and 901B, lines 5 and 7 at the next timing 902A and 902B, lines 2 and 4 at the next timing 903A and 903B, and lines 6 and 8 at the next timing 904A and 904B. Drive. As in the example of FIG. 8, when radiation is detected, the idle reading drive is stopped, charge accumulation is performed, and after accumulation, lines 1 and 3 at timings 911A and 911B, and lines 5 and 7 at the next timings 912A and 912B. At the next timings 913A and 913B, the lines 2 and 4 are further read, and at the next timings 914A and 914B, the lines are read in a plurality of lines in this order.

  In this case, the selection unit 1010 performs first detection driving (corresponding to main reading driving from timings 911A and 911B to timings 914A and 914B) for performing detection driving by the drive circuit 702 for each of a plurality of lines for a first time, Any one of the second detection driving (corresponding to the main reading driving from the timing 901A, 901B to the timing 904A, 904B) that causes the detection driving to be performed for a plurality of lines for a second time shorter than the first time. Select whether to execute by.

  Also, either a method of sequentially driving one line as shown in FIG. 8 or a method of driving a plurality of lines as shown in FIG. 9 may be used. In this case, the selection unit 1010 drives either the first detection drive that sequentially performs detection drive by the drive circuit 702 for each line, or the second detection drive that simultaneously performs detection drive for a plurality of lines. You may select whether to perform by the control part 720. FIG.

  In addition, the selection unit 1010 may select the number of lines on which detection driving is performed simultaneously from a plurality of options. An option for the number of lines may be presented to the user and selected according to user input.

  According to the present embodiment, the number of lines in which artifacts are generated is reduced (for example, the first detection driving that is sequentially performed for each line), and the number of lines in which artifacts are generated is increased, but the depth of artifact damage is increased. It becomes possible to adaptively select a lesser number of drives (for example, a second detection drive that is performed simultaneously on a plurality of lines). This reduces the effects of artifacts while reducing the patient's invalid exposure, even in systems where radiography is performed after radiation is detected and synchronous communication is not performed between the radiation generator and the radiography apparatus. can do.

(Other embodiments)
The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, or the like) of the system or apparatus reads the program. It is a process to be executed.

Claims (15)

A plurality of pixels are arranged in a matrix, a radiation sensor that detects radiation by each pixel and obtains a radiation image, and the plurality of pixels are read out in units of lines of either rows or columns and stored in the radiation sensor. Driving means for executing detection driving for removing the charged charges;
A detection circuit that detects that the radiation sensor is irradiated with radiation based on an electrical signal output from the radiation sensor by the detection drive, and a radiation imaging apparatus comprising:
Comprising setting means for setting an imaging mode of the radiation imaging apparatus;
When the imaging mode of the radiation imaging apparatus is a first imaging mode for imaging a subject, the driving means sets the pixels of each line to a first time readout state by driving to remove the charge,
When the shooting mode is the second shooting mode for shooting a corrected image in the absence of a subject, the pixels of each line are longer than the first time by driving to remove the charge. A radiographic apparatus characterized by being in a time reading state. A plurality of pixels are arranged in a matrix, a radiation sensor that detects radiation by each pixel and obtains a radiation image, and the plurality of pixels are read out in units of lines of either rows or columns and stored in the radiation sensor. Driving means for executing detection driving for removing the charged charges;
A detection circuit that detects that the radiation sensor is irradiated with radiation based on an electrical signal output from the radiation sensor by the detection drive;
Either a first detection drive for performing the detection drive for each line for a first time or a second detection drive for performing the detection drive for each line for a second time shorter than the first time. Selecting means for selecting whether to execute the driving means;
A radiation imaging apparatus comprising: A plurality of pixels are arranged in a matrix, a radiation sensor that detects radiation by each pixel and obtains a radiation image, and the plurality of pixels are read out in units of lines of either rows or columns and stored in the radiation sensor. Driving means for executing detection driving for removing the charged charges;
A detection circuit that detects that the radiation sensor is irradiated with radiation based on an electrical signal output from the radiation sensor by the detection drive;
Selection for selecting which of the first detection drive for sequentially performing the detection drive for each line and the second detection drive for performing the detection drive for a plurality of lines simultaneously by the driving means. Means,
A radiation imaging apparatus comprising: A plurality of pixels are arranged in a matrix, a radiation sensor that detects radiation by each pixel and obtains a radiation image, and the plurality of pixels are read out in units of lines of either rows or columns and stored in the radiation sensor. Driving means for executing detection driving for removing the charged charges;
A detection circuit that detects that the radiation sensor is irradiated with radiation based on an electrical signal output from the radiation sensor by the detection drive;
A selection means for selecting the number of lines for simultaneously performing the detection drive from a plurality of options;
A radiation imaging apparatus comprising: Further comprising setting means for setting an imaging region of the radiography,
The radiation imaging apparatus according to claim 2, wherein the selection unit performs selection according to the set imaging region.   6. The radiation imaging apparatus according to claim 5, wherein selection by the selection unit is performed in accordance with radiation irradiation conditions corresponding to the set imaging region. Further comprising setting means for setting the radiation exposure conditions of the radiography,
The radiation imaging apparatus according to claim 2, wherein the selection unit performs selection according to the set irradiation condition.   The radiographic apparatus according to any one of claims 2 to 4, wherein the selection by the selection unit is selected based on at least one of imaging part information and radiation irradiation conditions of the radiography.   The drive means, when the irradiation of the radiation is detected, stops the detection drive and performs an imaging drive for reading out the electric charge accumulated in the radiation sensor and obtaining a radiographic image. The radiation imaging apparatus according to any one of 1 to 8. A radiation imaging system comprising the radiation imaging apparatus according to claim 9 and a console that communicates with the radiation imaging apparatus,
The radiation imaging apparatus includes a communication unit that transmits an image acquired by the imaging drive to the console.
The radiography system, wherein the console includes image processing means for processing the image received from the radiography apparatus. When the acquired image is an image taken without a subject, the communication means transmits the number information of the line where the detection drive is stopped together with the image to the console,
The radiation imaging system according to claim 10, wherein the image processing unit performs an artifact correction process on the image based on the line number information.   12. The image processing unit performs correction processing using an average value of lines before and after the line where the detection driving is stopped as a pixel value of the line based on the line number information. The radiation imaging system described in 1. When the image acquired by the shooting drive is an image shot in a state where a subject is present, the communication unit transmits the image to the console,
The radiation imaging system according to claim 10, wherein the image processing unit performs normalization processing on the image using a correction image stored in advance. A plurality of pixels are arranged in a matrix, a radiation sensor that detects radiation by each pixel and obtains a radiation image, and the plurality of pixels are read out in units of lines of either rows or columns and stored in the radiation sensor. Driving means for executing detection driving for removing the charged charges;
A detection circuit that detects that the radiation sensor is irradiated with radiation based on an electrical signal output from the radiation sensor by the detection drive;
A control method for a radiation imaging apparatus having a setting means for setting an imaging mode,
When the driving means is a first imaging mode for imaging a subject, the imaging mode of the radiation imaging apparatus is set to a first time readout state for each line of pixels by driving to remove the charge,
When the shooting mode is the second shooting mode for shooting a corrected image in the absence of a subject, the pixels of each line are longer than the first time by driving to remove the charge. A control method for a radiation imaging apparatus, comprising: a driving process for setting the readout state for a predetermined time.   The program for making a computer perform each process of the control method of the radiography apparatus of Claim 14.

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