JP2015073241A - Radiation image photographing device and radiation image photographing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiation image photographing device 1 which can precisely detect irradiation start of radiation even in a case when irradiation time of the radiation is short like in photographing of a newborn infant.SOLUTION: Detection means 22 of a radiation image photographing device 1 is constituted to detect irradiation start of radiation when it is determined that there is a possibility that the irradiation of the radiation is continuously started in acquisition processing of an object value dleak for the prescribed number of times. Detection processing of the irradiation start of the radiation is simultaneously performed in parallel under a plurality of conditions including the condition that a first prescribed number of times, which is set for regular photographing, is set as the prescribed number of times, and a second prescribed number of times, which is set for the prescribed number of times, which is smaller than the first prescribed number of times. When the irradiation start of the radiation is detected in at least one detection processing in the respective detection processing performed under the plurality of conditions, the irradiation of the radiation is detected to be started.

Description

  The present invention relates to a radiographic image capturing apparatus and a radiographic image capturing system, and more particularly, to a radiographic image capturing apparatus that performs radiographic image capturing by detecting the start of radiation irradiation and a radiographic image capturing system using the same.

  A so-called direct-type radiographic imaging device that generates electric charges by a detection element in accordance with the dose of irradiated radiation such as X-rays and converts it into an electrical signal, or other radiation such as visible light with a scintillator A so-called indirect radiographic imaging device that converts the light into a wavelength and then generates electric charges by a photoelectric conversion element such as a photodiode in accordance with the energy of the converted and irradiated light to convert it into an electrical signal (ie, image data). Have been developed. In the present invention, the detection element in the direct type radiographic imaging apparatus and the photoelectric conversion element in the indirect type radiographic imaging apparatus are collectively referred to as a radiation detection element.

  This type of radiographic image capturing apparatus is known as an FPD (Flat Panel Detector), and is conventionally configured as a so-called dedicated machine type (also referred to as a fixed type) integrally formed with a support base. In recent years, a portable radiographic image capturing apparatus in which a radiation detection element or the like is housed in a casing and can be carried has been developed and put into practical use.

  In such a radiographic imaging apparatus, for example, as shown in FIG. 3 and the like, which will be described later, normally, a plurality of radiation detection elements 7 are arranged in a two-dimensional form (matrix) on the detection unit P, and each radiation detection element 7 is connected to a switch element 8 formed of a thin film transistor (hereinafter referred to as TFT). In general, imaging is performed by irradiating the radiation image capturing apparatus with radiation from the radiation generating apparatus through the patient as the subject.

  By the way, in the conventional radiographic imaging system using the radiographic imaging device, imaging is performed by exchanging signals between the radiographic imaging device and the radiation generating device. That is, in order to accurately store the charges generated in each radiation detection element 7 by radiation irradiation, radiation is generated prior to the irradiation from the radiation generator. When the irradiation start signal is transmitted from the apparatus to the radiographic image capturing apparatus and the radiographic image capturing apparatus receives the irradiation start signal, the reset processing of each radiation detecting element 7 is stopped and all TFTs 8 are turned off (that is, charge described later). In addition, an interlock release signal is transmitted to the radiation generator. The radiation generator is configured to irradiate radiation only when the interlock release signal is received.

  However, for example, when the manufacturers of the radiographic imaging apparatus and the radiation generation apparatus are different, it may not always be easy to construct an interface between them, or the interface may not be constructed. . In such a case, since the radiographic imaging device does not know at which timing the radiation is emitted from the radiation generator, the radiographic imaging device can detect itself that the radiation has been emitted from the radiation generator. Need to be configured. Various types of radiographic image capturing apparatuses that can detect the start of radiation irradiation and perform image capturing with the radiographic image capturing apparatus itself have been developed.

  For example, in the inventions described in Patent Document 1 and Patent Document 2, when radiation is started on the radiation image capturing apparatus and a charge is generated in each radiation detection element 7, each radiation detection element 7 causes each radiation detection element to be generated. As shown in FIG. 18, the bias line 9 is provided with a current detection means 26 by utilizing the fact that charges flow out to the bias line 9 connected to 7 and the current flowing through the bias line 9 increases. It has been proposed to detect the value of a current flowing in the interior and detect the start of radiation irradiation based on the detected current value.

  Further, as described in Patent Document 3 and the like, each of the scanning lines 5 is applied with an off-voltage from the gate driver 15b (see FIG. 3 to be described later) of the scanning driving means 15 before the start of radiation irradiation. It is also possible to configure the readout circuit 17 to perform a readout operation in a state where the TFT 8 is turned off, and to perform a readout process of the leak data dleak that reads out the electric charge leaked from the radiation detection element 7 through the TFT 8 as the leak data dleak. Is possible.

  Further, as described in Patent Document 4 and the like, it is also possible to perform a configuration in which image data reading processing is performed before the start of radiation irradiation. In this case, the image data read out is distinguished from the image data D read out as a main image after photographing, and is hereinafter referred to as irradiation start detection data d.

  If the inventions described in Patent Documents 3 and 4 are adopted, when radiation irradiation to the radiographic imaging apparatus is started, the read leak data dleak and irradiation start detection data d are set to values of radiation. It becomes much larger than before the start of irradiation. For this reason, it is possible to detect the start of radiation irradiation when the read leak data dleak or irradiation start detection data d becomes equal to or greater than a threshold value.

  Even if any of the above-described detection methods is adopted, when the radiation imaging apparatus detects the start of radiation irradiation, the radiation detection element 7 that has been reset and reading of the irradiation start detection data d are performed. It is configured to stop processing, turn off all TFTs 8 and shift to a charge accumulation state

US Pat. No. 7,211,803 JP 2009-219538 A International Publication No. 2011/13517 Pamphlet International Publication No. 2011-152093 Pamphlet

  By the way, in the research of the present inventors, for example, when a shock or vibration is applied to the radiographic imaging device configured as described above, the radiographic imaging device is not irradiated with radiation, but the above-mentioned It has been found that there is a case where a large noise is generated in a value (a current value detected by the current detection means 26, a leaked data dleak to be read, an irradiation start detection data d, etc.) and the value becomes large.

  In such a case, if this value is equal to or greater than the threshold value, it is erroneously detected that radiation irradiation has started. In the following, the above values, that is, the current value detected by the current detection means 26, the leaked data dleak to be read, the irradiation start detection data d, etc. are changed by the irradiation of the radiation, and the irradiation start is detected. It is called a target value in the sense that it is a value that is a judgment target.

  However, even when such noise occurs, the period during which the target value increases due to the noise on the target value and is equal to or greater than the threshold is usually very short. On the other hand, when the target value increases due to the irradiation of radiation, the target value continues to be larger than the threshold value as long as the radiation imaging apparatus is irradiated with the radiation.

  Therefore, for example, a period longer than the above-described period in which the target value is increased by noise on the target value and becomes equal to or greater than the threshold is set in advance in the radiographic imaging apparatus. Then, after the target value increases and becomes equal to or greater than the threshold value, the target value does not decrease below the threshold value even after the predetermined period has elapsed, that is, the target value is equal to or greater than the threshold value even after the predetermined period has elapsed. The radiographic imaging apparatus can be configured to detect the start of radiation irradiation only when it continues.

  If configured in this way, the radiographic imaging device immediately falls below the threshold even if noise occurs due to impact or the like and the target value exceeds the threshold, so that the target value is above the threshold. Does not continue for a predetermined period of time. For this reason, it is possible to accurately prevent erroneous detection of the start of radiation irradiation by applying an impact or the like to the radiographic imaging device.

  At the same time, when radiation is emitted from the radiation generator, radiation irradiation continues for the predetermined period or longer, so even if the predetermined period elapses after the target value becomes larger than the threshold value. The target value does not fall below the threshold value. For this reason, it is possible to reliably detect the start of radiation irradiation. In other words, the above-mentioned predetermined period of time accurately prevents the erroneous start of radiation irradiation as described above, and reliably detects the start of radiation irradiation when radiation is actually irradiated. A period that can be set is set.

  On the other hand, for example, when performing radiographic imaging (so-called neonatal imaging) for a newborn in a neonatal specific intensive care unit (NICU) in a hospital, etc. From the viewpoint of reducing the influence, imaging may be performed by irradiating the radiation from the radiation generator for a very short time.

  In such a case, as described above, if a predetermined period set in advance in the radiographic image capturing apparatus is long, a target value (that is, current value, leak data dleak, irradiation start detection data d, etc.) increases. After reaching the threshold value or more, there is a possibility that the irradiation of radiation may be terminated before the predetermined period elapses.

  In such a case, since the period during which the target value is equal to or greater than the threshold is shorter than the set predetermined period, the target value is the threshold when the predetermined period elapses after the target value becomes greater than or equal to the threshold. Therefore, even though the radiation image capturing apparatus is irradiated with radiation, a situation may occur in which the radiation image capturing apparatus cannot detect it.

  The present invention has been made in view of the above points, and uses a radiographic imaging apparatus capable of accurately detecting the start of radiation irradiation even when the radiation irradiation time is short as in the case of newborn imaging. An object of the present invention is to provide a radiographic imaging system.

In order to solve the above-described problem, the radiographic imaging device of the present invention includes:
A plurality of scanning lines and a plurality of signal lines;
A plurality of radiation detection elements arranged two-dimensionally;
Scanning drive means for switching on and applying an on-voltage and an off-voltage to each scanning line;
A switch element connected to each of the scanning lines, and discharging a charge accumulated in the radiation detection element to the signal line when an on-voltage is applied;
A readout circuit that converts the electric charge emitted from the radiation detection element into image data and reads the image data;
Detecting means for determining the possibility that radiation irradiation has been started based on the target value each time a target value that varies due to radiation irradiation is acquired;
With
The detection means includes
It is configured to detect the start of radiation irradiation when it is determined that there is a possibility that radiation irradiation has been started continuously in the predetermined number of times of acquisition processing of the target value,
In addition, the detection process of the start of radiation irradiation is set to a condition in which the first predetermined number of times set for normal imaging is set as the predetermined number of times and a number of times smaller than the first predetermined number of times. And a plurality of conditions including a condition for which the second predetermined number of times is set,
When the start of radiation irradiation is detected in at least one of the detection processes performed under the plurality of conditions, the start of radiation irradiation is detected.

Moreover, the radiographic imaging system of the present invention is
A plurality of scanning lines and a plurality of signal lines;
A plurality of radiation detection elements arranged two-dimensionally;
Scanning drive means for switching on and applying an on-voltage and an off-voltage to each scanning line;
A switch element connected to each of the scanning lines, and discharging a charge accumulated in the radiation detection element to the signal line when an on-voltage is applied;
A readout circuit that converts the electric charge emitted from the radiation detection element into image data and reads the image data;
Detecting means for determining the possibility that radiation irradiation has been started based on the target value each time a target value that varies due to radiation irradiation is acquired;
A radiographic imaging device comprising:
A console for controlling the radiographic apparatus,
With
The detection means of the radiographic image capturing apparatus includes:
It is configured to detect the start of radiation irradiation when it is determined that there is a possibility that radiation irradiation has been started continuously in the predetermined number of times of acquisition processing of the target value,
In addition, the detection process of the start of radiation irradiation is set to a condition in which the first predetermined number of times set for normal imaging is set as the predetermined number of times and a number of times smaller than the first predetermined number of times. The second predetermined number of times can be performed under a plurality of conditions including a set condition,
The console controls the radiographic imaging apparatus to perform the detection process under a condition in which the second predetermined number of times is set when imaging with a short irradiation time of radiation is designated. .

Moreover, the radiographic imaging system of the present invention is
A plurality of scanning lines and a plurality of signal lines;
A plurality of radiation detection elements arranged two-dimensionally;
Scanning drive means for switching on and applying an on-voltage and an off-voltage to each scanning line;
A switch element connected to each of the scanning lines, and discharging a charge accumulated in the radiation detection element to the signal line when an on-voltage is applied;
A readout circuit that converts the electric charge emitted from the radiation detection element into image data and reads the image data;
Detecting means for determining the possibility of starting radiation irradiation based on the target value every time a target value that varies due to radiation irradiation is acquired;
A radiographic imaging device comprising:
An image processing device for generating a radiographic image based on the image data transmitted from the radiographic imaging device;
With
The detection means of the radiographic image capturing apparatus includes:
For imaging, the radiation detection element reset processing performed by sequentially applying an on-voltage to each scanning line from the scanning drive unit, and the target value acquisition processing are alternately performed,
It is configured to detect the start of radiation irradiation when it is determined that there is a possibility that radiation irradiation has been started continuously in the predetermined number of times of acquisition processing of the target value,
The image processing apparatus includes:
The on-voltage is applied in the reset process of each radiation detection element performed immediately before the acquisition process other than the last acquisition process among the predetermined number of acquisition processes of the target value in the radiographic imaging device For the image data read from each of the radiation detection elements connected to the scanning line, a process for restoring the image data whose value has decreased is performed,
For the image data read from each radiation detection element connected to the scanning line to which the on-voltage is applied in the reset process of each radiation detection element performed immediately before the last acquisition process, Line defect correction is performed based on the image data of each radiation detection element connected to the scanning line in the vicinity of the scanning line.

  According to the radiation image capturing apparatus and the radiation image capturing system of the system of the present invention, even when the radiation irradiation time is short, such as for neonatal photographing, the radiation image capturing apparatus can accurately start the radiation irradiation. Can be detected. And it becomes possible to produce | generate a radiographic image exactly based on the image data etc. which were read by the radiographic imaging apparatus.

It is sectional drawing of a radiographic imaging apparatus. It is a top view which shows the structure of the board | substrate of a radiographic imaging apparatus. It is a block diagram showing the equivalent circuit of a radiographic imaging apparatus. It is a block diagram showing the equivalent circuit about 1 pixel which comprises a detection part. 6 is a timing chart showing charge reset switches, pulse signals, and TFT on / off timings in image data read processing. It is a figure which shows the structural example of a radiographic imaging system. It is a figure explaining that each electric charge which leaked from each radiation detection element via TFT is read as leak data. It is a graph showing the example of the time transition of the leak data read. 6 is a timing chart showing charge reset switches, pulse signals, and on / off timings of TFTs in a case where leak data reading processing and radiation detection element reset processing are alternately performed before radiographic imaging. 10 is a timing chart showing a charge accumulation state and timing for applying an on-voltage to each scanning line in a reading process of image data when detecting the start of radiation irradiation described in Patent Document 3 and the like. An on-voltage is applied to each scanning line when it is configured to detect the start of radiation irradiation when it is determined that there is a possibility that radiation irradiation has been started continuously by a predetermined number of reading processes of leak data. It is a timing chart showing timing etc. It is a graph showing the ratio of the image data in the four scanning lines to which the on-voltage is applied during the irradiation of radiation and the scanning lines in the vicinity thereof when the irradiation time of radiation is 100 lines. It is a graph showing the ratio of the image data in the four scanning lines to which the on-voltage is applied during the irradiation of radiation and the scanning lines in the vicinity thereof when the irradiation time of the radiation is 8 lines. It is a graph showing the ratio of the image data in the two scanning lines to which the on-voltage is applied during radiation irradiation and the scanning lines in the vicinity thereof. (A) It is a figure showing the line defect which arises in image data or a radiographic image, (B) It is a figure showing the state in which the line defect was located in a line. It is a graph showing the ratio of the image data in the four scanning lines to which the on-voltage is applied during radiation irradiation and the scanning lines in the vicinity thereof. It is a graph showing the ratio of the image data in the two scanning lines to which the on-voltage is applied during radiation irradiation and the scanning lines in the vicinity thereof. It is a block diagram showing the equivalent circuit of the radiographic imaging apparatus when a current detection means is provided in a bias line or connection.

  Embodiments of a radiographic imaging apparatus and a radiographic imaging system according to the present invention will be described below with reference to the drawings.

  In the following description, a so-called indirect radiation image capturing apparatus that includes a scintillator or the like as a radiation image capturing apparatus and converts an irradiated radiation into light of another wavelength such as visible light to obtain an electrical signal will be described. The present invention can also be applied to a so-called direct type radiographic imaging apparatus that directly detects radiation with a radiation detection element without using a scintillator or the like.

  Although the case where the radiographic imaging apparatus is a so-called portable type will be described, the present invention can also be applied to a so-called dedicated machine type radiographic imaging apparatus formed integrally with a support base or the like. Is possible.

[First Embodiment]
[Radiation imaging equipment]
A basic configuration of the radiographic image capturing apparatus according to the present embodiment will be described. FIG. 1 is a cross-sectional view of a radiographic image capturing apparatus according to the present embodiment, and FIG. 2 is a plan view illustrating a configuration of a substrate of the radiographic image capturing apparatus.

  In this embodiment, as shown in FIG. 1, the radiographic image capturing apparatus 1 includes a scintillator 3 and a sensor substrate 4 in a housing 2 having a radiation incident surface R that is a surface on which radiation is irradiated. The sensor panel SP to be stored is accommodated. Although not shown in FIG. 1, in this embodiment, an antenna device 41 (see FIG. 3 to be described later) that transmits image data D or the like to the console 58 (see FIG. 6) to be described later wirelessly is provided in the housing 2. Reference) is provided.

  Although not shown in FIG. 1, in the present embodiment, the radiographic image capturing apparatus 1 includes a connector on the side surface of the housing 2 or the like, and a console 58 receives signals and data in a wired manner via the connector. Etc. can be sent to.

  As shown in FIG. 1, a base 31 is disposed in the housing 2, and the radiation incident surface R side of the base 31 (hereinafter, simply referred to as the upper surface side in accordance with the vertical direction in the drawing). ) Is provided with a sensor board 4 through a lead thin plate (not shown). And the scintillator board | substrate 34 is provided in the upper surface side of the sensor board | substrate 4 so that the scintillator 3 which converts the irradiated radiation into light, such as visible light, may be arrange | positioned.

  On the other hand, on the lower surface side of the base 31, a PCB substrate 33 on which electronic components 32 and the like are disposed, a battery 24, and the like are attached. In this way, the sensor panel SP is formed by the base 31, the sensor substrate 4, and the like. In the present embodiment, the buffer material 35 is provided between the sensor panel SP and the side surface of the housing 2.

  In the present embodiment, the sensor substrate 4 is composed of a glass substrate, and as shown in FIG. 2, a plurality of scanning lines 5 and a plurality of scanning lines 5 are provided on the upper surface (that is, the surface facing the scintillator 3) 4 a of the sensor substrate 4. The signal lines 6 are arranged so as to cross each other. A radiation detection element 7 is provided in each small region r defined by the plurality of scanning lines 5 and the plurality of signal lines 6 on the surface 4 a of the sensor substrate 4.

  In this way, the entire small region r provided with a plurality of radiation detection elements 7 arranged in a two-dimensional form (matrix) in each small region r partitioned by the scanning lines 5 and the signal lines 6, that is, FIG. The area indicated by the alternate long and short dash line in FIG. In the present embodiment, a photodiode is used as the radiation detection element 7, but a phototransistor or the like can also be used, for example.

  Here, the circuit configuration of the radiation image capturing apparatus 1 will be described. FIG. 3 is a block diagram illustrating an equivalent circuit of the radiographic image capturing apparatus 1 according to the present embodiment, and FIG. 4 is a block diagram illustrating an equivalent circuit for one pixel constituting the detection unit P.

  The first electrode 7a of each radiation detection element 7 is connected to a source electrode 8s (see “S” in FIG. 3 and FIG. 4) of a TFT 8 serving as a switch element. Further, the drain electrode 8d and the gate electrode 8g (see “D” and “G” in FIGS. 3 and 4) of the TFT 8 are connected to the signal line 6 and the scanning line 5, respectively.

  The TFT 8 is turned on when a turn-on voltage is applied to the gate electrode 8g via the scanning line 5 from the scanning driving means 15 described later, and is accumulated in the radiation detection element 7 via the source electrode 8s and the drain electrode 8d. The charged electric charge is discharged to the signal line 6. Further, when a turn-off voltage is applied to the gate electrode 8 g via the scanning line 5, the gate electrode 8 g is turned off, the discharge of charge from the radiation detection element 7 to the signal line 6 is stopped, and charge is accumulated in the radiation detection element 7. It is supposed to let you.

  In the present embodiment, as shown in FIGS. 2 and 3, the bias is applied to the second electrode 7 b of each radiation detection element 7 at a ratio of one for each radiation detection element 7 in one row on the sensor substrate 4. Lines 9 are connected, and each bias line 9 is connected to the connection 10 at a position outside the detection portion P of the sensor substrate 4. The connection 10 is connected to a bias power supply 14 (see FIGS. 3 and 4) via an input / output terminal 11 (also referred to as a pad, see FIG. 2). The connection 10 and each bias line 9 are connected from the bias power supply 14 to the connection. Thus, a reverse bias voltage is applied to the second electrode 7b of each radiation detection element 7.

  In the present embodiment, each input / output terminal 11 is connected to a flexible circuit board (not shown) in which chips such as a readout IC 16 described later and a gate IC 15d constituting a gate driver 15b of the scanning drive means 15 are incorporated on a film. Thus, the scanning lines 5, signal lines 6, and bias lines 9 on the sensor substrate 4 are electrically connected to the electronic components 32 on the back side of the sensor panel SP (see FIG. 1) via the flexible substrate. It has come to be.

  On the other hand, in the scanning drive means 15, an on-voltage and an off-voltage are supplied from the power supply circuit 15a to the gate driver 15b via the wiring 15c, and each line L1 to Lx of the scanning line 5 is supplied to the gate driver 15b. The applied voltage is switched between an on voltage and an off voltage.

  Each signal line 6 is connected to each readout circuit 17 built in the readout IC 16 via each input / output terminal 11. In the present embodiment, the readout circuit 17 is mainly composed of an amplification circuit 18 and a correlated double sampling circuit 19. An analog multiplexer 21 and an A / D converter 20 are further provided in the read IC 16. 3 and 4, the correlated double sampling circuit 19 is represented as CDS.

  In the present embodiment, the amplifier circuit 18 is a charge amplifier circuit including an operational amplifier 18a, a capacitor 18b and a charge reset switch 18c connected in parallel to the operational amplifier 18a, and a power supply unit 18d that supplies power to the operational amplifier 18a and the like. It consists of The signal line 6 is connected to the inverting input terminal on the input side of the operational amplifier 18a of the amplifier circuit 18. The charge reset switch 18 c of the amplifier circuit 18 is connected to the control means 22, and is turned on / off by the control means 22.

  In the reset process of each radiation detection element 7, an on-voltage is applied from the scanning drive unit 15 to each line L <b> 1 to Lx of the scanning line 5 with the charge reset switch 18 c of the amplifier circuit 18 turned on. The charges are removed from the radiation detection elements 7 by sequentially applying and releasing the charges from the radiation detection elements 7 to the signal lines 6 through the TFTs 8 turned on. The electric charges emitted from the radiation detecting elements 7 flow out from the signal line 6 through the electric charge reset switch 18 c of the amplifier circuit 18.

  Further, in the process of reading the image data D from each radiation detection element 7, as shown in FIG. 5, the radiation reset switch 18c of the amplifier circuit 18 of the readout circuit 17 is turned off. When the TFT 8 of the detection element 7 is turned on, electric charges are released from within each radiation detection element 7, and the discharged electric charges flow through the signal line 6 into the capacitor 18 b of the amplifier circuit 18 and accumulate. In the amplifier circuit 18, a voltage value corresponding to the amount of charge accumulated in the capacitor 18b is output from the output side of the operational amplifier 18a.

  The correlated double sampling circuit 19 is supplied from the amplifier circuit 18 before and after the charge flows from each radiation detection element 7 based on the pulse signals Sp1 and Sp2 transmitted from the control means 22 before and after the charge flows from each radiation detection element 7. Are output, and the difference between them is output to the downstream side as analog value image data D.

  The output image data D is sequentially transmitted to the A / D converter 20 via the analog multiplexer 21 (see FIG. 3), and is sequentially converted into digital image data D by the A / D converter 20. Are output to the storage means 23 and sequentially stored. In this way, the reading process of the image data D is performed.

  The control means 22 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an input / output interface, etc., not shown, connected to a bus, an FPGA (Field Programmable Gate Array), or the like. It is configured. It may be configured by a dedicated control circuit.

  Then, the control unit 22 controls the operation of each functional unit of the radiographic imaging apparatus 1 such as controlling the scanning driving unit 15 and the readout circuit 17 to perform the readout process of the image data D as described above. It has become. As shown in FIGS. 3 and 4, the control means 22 is connected to a storage means 23 composed of SRAM (Static RAM), SDRAM (Synchronous DRAM) or the like.

  In the present embodiment, the control unit 22 is connected to the antenna device 41 described above, and is further necessary for each functional unit such as the scanning drive unit 15, the readout circuit 17, the storage unit 23, and the bias power source 14. A battery 24 for supplying power is connected.

[Radiation imaging system]
Next, a basic configuration of the radiation image capturing system 50 in which the radiation image capturing apparatus 1 according to the present embodiment is used will be described. FIG. 6 is a diagram illustrating a configuration example of the radiation image capturing system 50 according to the present embodiment.

  In the present embodiment, as described above, it is assumed that radiographic imaging (so-called neonatal imaging) is performed on a newborn in a neonatal specific intensive care unit or the like in a hospital. In order to explain the basic configuration and the like, FIG. 6 shows a case where the subject is a general adult patient.

  Further, as described above, since it is assumed that the radiographic imaging system 50 is brought into the hospital room R including the neonatal specific intensive care unit and the like to perform imaging, in FIG. Although the case where it builds above is shown, it is possible to apply this invention also when building a radiographic imaging system in the imaging room etc. of a hospital, for example.

  The round wheel 71 is equipped with a radiation generator 55 and its radiation source 52, and an exposure switch is operated by an operator such as a radiologist to instruct the radiation generator 55 to start radiation irradiation. 56 is attached. Note that the radiation source 52 can adjust its horizontal position and vertical position, that is, height, etc., and can narrow the irradiation field of the irradiated radiation.

  Further, the roundabout wheel 71 is equipped with a console 58 constituted by a computer or the like, and the console 58 is provided with a display unit 58a constituted by a CRT (Cathode Ray Tube), an LCD (Liquid Crystal Display) or the like. It has been. Although not shown, the console 58 is connected to input means such as a mouse and a keyboard, and is connected to or built in storage means constituted by an HDD (Hard Disk Drive) or the like.

  In addition, the round wheel 71 is provided with a relay (also referred to as a base station) 54 for relaying communication between the console 58, the radiographic imaging device 1, the radiation generator 55, and the like. The repeater 54 is provided with an access point 53 so that the radiographic imaging apparatus 1 can transmit and receive image data D and signals in a wireless manner.

  The relay 54 converts a LAN (Local Area Network) communication signal transmitted from the radiation imaging apparatus 1 or the console 58 to the radiation generation apparatus 55 into a signal for the radiation generation apparatus 55, and the like. A converter (not shown) that performs the reverse conversion is incorporated.

  On the other hand, as shown in FIG. 6, the radiographic image capturing apparatus 1 can be used by being inserted between the bed B and the body of the patient H or applied to the body of the patient H, for example. .

  In this embodiment, the console 58 also functions as an image processing device. When image data D or the like is transmitted from the radiographic image capturing device 1, offset correction, gain correction, A radiographic image is generated by performing precise image processing such as defective pixel correction and gradation processing according to the imaging region.

[Basic configuration of detection method of radiation irradiation start]
In the present embodiment, the radiographic imaging device 1 is configured to detect that radiation irradiation has started in the radiographic imaging device 1 itself without establishing an interface with the radiation generation device 55. Yes. And in the radiographic imaging device 1 which concerns on this embodiment, the detection method based on the leak data dleak described in patent document 3 etc. which were mentioned above is employ | adopted. The basic configuration of this detection method will be briefly described below.

  In the present embodiment, the above-described target values, that is, target values that vary due to radiation irradiation are the leak data dleak and various values calculated from the leak data dleak as described later.

  In the following, the case where the start of radiation irradiation is detected by this detection method will be described. However, in addition to this, for example, the methods described in Patent Documents 1, 2, 4, etc. described above can also be used. . In the case of the detection methods described in Patent Documents 1 and 2, the target value is the value of the current flowing in the bias line 9. In the case of the detection method described in Patent Document 4, the target value is irradiation start detection data d and various values calculated from the data. It is also possible to configure so that the start of radiation irradiation is detected by a detection method other than the above. And a target value should just be a value which fluctuates by irradiation of a radiation, and is not limited to a specific value.

  In this embodiment, the control means 22 of the radiographic imaging device 1 is configured to function as a detection means for detecting the start of radiation irradiation. Note that the detection means may be configured by a circuit or the like separate from the control means 22.

  In the present embodiment, the control unit 22 as the detection unit is configured to repeatedly perform the reading process of the leak data dleak before photographing. As shown in FIG. 7, the leak data dleak is a signal line of charge q leaked from each radiation detection element 7 via each TFT 8 which is in an OFF state in a state where an OFF voltage is applied to each scanning line 5. Data corresponding to a total value of every six.

  That is, the reading process of the leak data dleak is performed by transmitting the pulse signals Sp1 and Sp2 from the control means 22 to the correlated double sampling circuit 19 as in the case of the reading process of the image data D shown in FIG. However, unlike the case of the reading process of the image data D, the on-voltage is not applied from the scanning drive means 15 to each scanning line 5, and the reading process is performed while each TFT 8 is in the off state. Is called.

  When the leak data dleak is configured to be read in this way, radiation irradiation to the radiation image capturing apparatus 1 is started, and light converted from radiation by the scintillator 3 (see FIG. 1) is irradiated to each TFT 8. Then, the amount of charge q (see FIG. 7) leaking from each radiation detection element 7 through each TFT 8 increases. Therefore, when the radiation image capturing apparatus 1 is irradiated with radiation, as shown in FIG. 8, the value of the leaked data dleak that is read out becomes larger than the value of the leaked data dleak that was read out before that (see FIG. 8). 8 time t1).

  Therefore, in the present embodiment, using this, as shown in FIG. 8, for example, the threshold value leak_th is set for the leak data dleak, and the read leak data dleak is equal to or greater than the threshold value dleak_th. At the time, the start of radiation irradiation to the radiographic imaging device 1 is detected.

  This detection method is the detection method described in Patent Document 3 described above. For details, refer to this document. It is also possible to calculate various values from the read leak data dleak, and to perform a radiation irradiation start detection process based on these values. For the detection process of the start of radiation irradiation using these various values, refer to Patent Document 3 and Japanese Patent Application Laid-Open No. 2012-176155 described above.

  Further, in the above detection method, the reading process of the leak data dleak is performed in a state where each TFT 8 is turned off as described above. If each TFT 8 is left in this OFF state, dark charges (also referred to as dark current or the like) generated in each radiation detection element 7 are continuously accumulated in each radiation detection element 7.

  Therefore, when this detection method is adopted, the radiation detection element 7 is reset between the leak data dleak read process and the next leak data dleak read process. That is, in this detection method, as shown in FIG. 9, normally, the reading process of leak data dleak and the reset process of each radiation detection element 7 are alternately performed.

  At that time, as shown in FIG. 9, the reset processing of each radiation detection element 7 is performed for each line L1 to Lx of the scanning line 5 from the gate driver 15b of the scanning drive means 15. Thus, the on-voltage is sequentially applied. In addition, when the period for performing the reading process of the leak data dleak is short, the reset process of each radiation detection element 7 is not necessarily performed.

  In the basic configuration of this detection method described in Patent Document 3 and the like, for example, as shown in FIG. 10, the leakage data dleak read process (see L in the figure) and each radiation detection element 7 as described above. If the radiation imaging apparatus 1 is irradiated with radiation in a state where the reset process (see R in the figure) is repeated, the leak data dleak read out in the readout process of the leak data dleak immediately after the radiation irradiation is started The start of radiation irradiation is detected (see “detection” in FIG. 10), for example, when the value becomes larger than or equal to the threshold value dleak_th (see FIG. 8).

  When detecting the start of radiation irradiation, the control means 22 of the radiographic imaging apparatus 1 applies an off voltage to each scanning line 5 from the scanning drive means 15 to turn off each TFT 8 and detect each radiation by irradiation. The charge generated in the elements 7 is shifted to a charge accumulation state in which the radiation detection elements 7 are accumulated.

  Then, the control unit 22 causes the image data D to be read after continuing the charge accumulation state for a predetermined time. At that time, as shown in FIG. 10, the on-voltage is applied next to the scanning line 5 to which the on-voltage was last applied before detecting the start of radiation irradiation (in the case of FIG. 10, the line L1 of the scanning line 5). The application of the on-voltage is started from the scanning line 5 (line L2 of the scanning line 5 in the case of FIG. 10), and the on-voltage is sequentially applied from the gate driver 15b to each scanning line 5 to read out the image data D. Can be configured to do.

  In the reading process of the image data D, for example, the application of the on-voltage is started from the first line L1 of the scanning line 5, and the on-voltage is sequentially applied to each of the lines L1 to Lx of the scanning line 5, thereby It is also possible to perform a read process.

[Improved version of detection method of radiation irradiation start]
On the other hand, as described above, when an impact or the like is applied to the radiographic image capturing apparatus 1, noise is added to the target value, that is, when the above-described detection method is used, the read leak data dleak is increased, and the leak data dleak increases. If the leaked data dleak to be read is equal to or greater than the threshold dleak_th, there is a possibility that the radiation imaging apparatus 1 may be erroneously detected as having started irradiation even though the radiation imaging apparatus 1 is not irradiated with radiation.

  However, the period during which noise is added to the leak data dleak (that is, the target value; the same applies hereinafter) and is larger than the threshold value dleak_th is usually very short. That is, for example, when the leak data dleak reading process and the resetting process of each radiation detection element 7 are alternately performed as shown in FIG. 9 or the like, an impact or the like is applied to the radiation image capturing apparatus 1 at a certain timing. Even if the leak data dleak read out in the read-out process performed is equal to or greater than the threshold value dleak_th, the leak data dleak read out at that time is performed when the reset process of each radiation detection element 7 is performed and the next read-out process is performed. In many cases, is already smaller than the threshold value dleak_th.

  On the other hand, when the leak data dleak is increased by the irradiation of radiation, the leakage data dleak continues to be equal to or greater than the threshold dleak_th as long as the radiation image capturing apparatus 1 is irradiated with the radiation.

  Therefore, in the present embodiment, as an improved version of the above detection method, for example, as shown in FIG. 11, the control means 22 of the radiographic image capturing apparatus 1 has leak data whose readout circuit 17 is the target value as described above. Each time bleak is read (acquired), the start of radiation irradiation is determined based on the read leak data dleak, but the leak data dleak read in one read process (acquisition process) is the threshold dleak_th. Even if it becomes above, it is not detected immediately that the irradiation of radiation is started, but the irradiation of the radiation is started when the leak data dleak read by one reading process becomes equal to or more than the threshold value dleak_th. It is configured to determine that there is a possibility.

  Then, the control means 22 continues the acquisition process of the target value a predetermined number of times, that is, in this case, a predetermined number of times (for example, four times in the case of FIG. 11) of the leak data dleak including the one read process described above. The radiation irradiation start is detected only when it is determined that there is a possibility that radiation irradiation has been started continuously in the reading process.

  With this configuration, even if noise is superimposed on the target value to be acquired, that is, the leaked data dleak to be read out in this case, due to an impact or the like applied to the radiographic image capturing apparatus 1, radiation irradiation is thereby started. Can be accurately prevented, and when radiation irradiation to the radiation image capturing apparatus 1 is actually started, it can be reliably detected.

[Configurations Specific to this Embodiment]
However, in order to reliably prevent erroneous detection of the start of radiation irradiation due to an impact or the like applied to the radiation image capturing apparatus 1, the “predetermined number” in the above readout process (acquisition process) is simply set to 4 times, for example. If the number is increased, the radiographic imaging device 1 may not be able to accurately detect the start of radiation irradiation when, for example, radiography is performed for a short time as in the above-described neonatal imaging. There is.

  That is, when the irradiation time of radiation is short, the irradiation of radiation is completed between the reading process in which the read leak data dleak is equal to or greater than the threshold value dleak_th and the reading process of the predetermined number of times (for example, four times). There is a possibility that. In this case, since the leak data dleak becomes less than the threshold value dleak_th in the last read process of at least the predetermined number of read processes, the radiation is continuously performed in the predetermined number of read processes of the leak data dleak as described above. It is not determined that there is a possibility that the irradiation has started. Therefore, the start of radiation irradiation is not detected.

  Therefore, in the radiographic image capturing apparatus 1 according to the present embodiment, the control unit 22 starts irradiation of radiation continuously in a predetermined number of times of reading processing (acquisition processing) of leak data dleak (target value) as described above. If it is determined that there is a possibility that the radiation has started, the radiation irradiation start is detected. At least two conditions: a condition for setting a first predetermined number of times (for example, four times) to be set and a condition for setting a second predetermined number of times (for example, two times) set to a smaller number of times Below, it is configured to perform each simultaneously in parallel.

  That is, for example, there is a possibility that radiation irradiation has been started continuously in the readout process of the leak data dleak, for example, as the predetermined number of times set for normal imaging as described above (first predetermined number of times). When it is determined that there is a radiation, the irradiation process is started continuously by the detection process for detecting the start of radiation irradiation and the reading process of the leak data dleak that is smaller than the predetermined number of times (for example, the second predetermined number of times). The detection processing for detecting the start of radiation irradiation when it is determined that there is a possibility of having been performed is configured to be performed simultaneously in parallel. Note that the first and second predetermined times are set to appropriate numbers, respectively.

  And in the radiographic imaging device 1 which concerns on this embodiment, when the control means 22 detects the irradiation start of radiation in at least 1 detection process among each detection processes performed on several conditions as mentioned above In addition, it is configured to detect that radiation irradiation has started.

  By configuring in this way, as described above, when the first predetermined number of times set for normal imaging is set to four times, for example, the first predetermined number of times because the irradiation time of radiation is short. Even when the irradiation of radiation is completed before the reading process is performed, a condition is set in which a second predetermined number of times (for example, two times) that is performed in parallel with the first predetermined number of times is set to be smaller. Below, for example, the leak data dleak becomes equal to or greater than the threshold dleak_th in any of the two predetermined number of reading processes.

  For this reason, even if the start of radiation irradiation cannot be detected by the detection process performed under the condition of the normal first predetermined number of times, the detection is performed under the condition of the second predetermined number of times less than the first predetermined number of times. It is possible to detect the start of radiation irradiation by the detection process. Therefore, in the radiographic image capturing apparatus 1 according to the present embodiment, the radiation image capturing apparatus 1 accurately detects the start of radiation irradiation even when the radiation irradiation time is short, such as in the above-described neonatal imaging. It becomes possible.

[effect]
As described above, according to the radiographic image capturing apparatus 1 and the radiographic image capturing system 50 according to the present embodiment, the control unit 22 (that is, the detecting unit) of the radiographic image capturing apparatus 1 determines the leak data dleak (target value). It is configured to detect the start of radiation irradiation when it is determined that there is a possibility that radiation irradiation has been started continuously in the number of times of reading processing (acquisition processing), and this radiation irradiation start detection processing As a predetermined number of times, a condition in which a first predetermined number of times set for normal shooting is set, and a condition in which a second predetermined number of times set to a number smaller than the first predetermined number of times is set Under the conditions of at least two, it was configured to perform each simultaneously in parallel.

  Therefore, for example, even when the radiation irradiation time is short, such as the above-described neonatal photographing, and the start of radiation irradiation cannot be detected by the detection process performed under the normal first predetermined number of conditions, the first The start of radiation irradiation can be detected by the detection process performed under the condition of the second predetermined number of times less than the predetermined number of times. Therefore, even when the radiation irradiation time is short, the radiation imaging apparatus 1 can accurately detect the start of radiation irradiation.

  The same applies to the second and third embodiments to be described later. In the first embodiment, the detection process of the start of radiation irradiation is set as a predetermined number of times for normal imaging. When configured to be performed under two conditions: a condition in which the first predetermined number of times is set, and a condition in which the second predetermined number of times is set to a number smaller than the first predetermined number of times. Explained.

  However, the detection process of the start of radiation irradiation is different from the first predetermined number of times and the second predetermined number of times in addition to the conditions for which the first predetermined number of times and the second predetermined number of times are set. It is also possible to configure so as to be performed even under other conditions in which is set, and the number of conditions with different predetermined times can be determined as appropriate.

[Modification 1]
As described above, the start of radiation irradiation is detected based on the leaked data dleak superimposed with noise, which increases and decreases in a shorter period as the second predetermined number of times is decreased (in this case, Erroneous detection). That is, when noise is superimposed on the read leak data dleak, the value of the leak data dleak with noise increases and decreases in a short period of time. During the predetermined number of reading processes 2, there is a high possibility that the leaked data dleak on which noise is superimposed will be equal to or greater than the threshold dleak_th, and erroneous detection of the start of radiation irradiation is likely to occur.

  Therefore, for example, the detection processing is performed under a second predetermined number of conditions smaller than the detection processing performed under the first predetermined number of conditions set for normal photographing as described above. In the detection process, it is preferable that the threshold value dleak_th (that is, the threshold value set for the target value) set for the read leak data dleak is set to a larger value.

  In this manner, radiation irradiation starts by increasing the threshold value in the detection process performed under the second predetermined number of times that makes it easy to erroneously detect the start of radiation irradiation based on the target value on which noise is superimposed. Can be accurately prevented from being erroneously detected.

[Second Embodiment]
In the first embodiment described above, the control unit 22 (that is, the detection unit) of the radiographic image capturing apparatus 1 performs the radiation irradiation start detection process for a first predetermined number of times set for normal imaging (for example, (4 times) is set at the same time, and the second predetermined number of times (for example, 2 times) is set at a smaller number of times, and the conditions are set at the same time in parallel. The case where it is configured has been described.

  However, for example, when imaging with a short radiation exposure time is designated by an operator such as a radiographer at the console 58 (see FIG. 6), a signal is transmitted from the console 58 to the radiographic imaging device 1 to cause radiation. It is also possible to configure the image capturing apparatus 1 so as to perform the detection process under the condition where the second predetermined number of times is set.

  At this time, the designation to the console 58 for imaging with a short irradiation time of radiation may be configured such that the operator operates the input means such as a keyboard and designates it on the display unit 58a of the console 58. It is also possible to display a button icon for designating imaging with a short irradiation time of the radiation, and to designate by clicking the button icon by the operator.

  Further, when the operator selects imaging order information for specifying imaging conditions related to imaging on the console 58, the console 58 automatically applies radiation exposure time based on the imaging conditions specified in the imaging order information. However, it is also possible to determine that short imaging is performed, and the method of specifying imaging with a short irradiation time of radiation is not limited.

  When the console 58 controls the radiographic image capturing apparatus 1 to perform the detection process under the condition where the second predetermined number of times is set, for example, the radiographic image capturing apparatus 1 has the first predetermined number of times described above. It is also possible to control to switch from the state where the detection process is performed under the set condition to the state where the detection process is performed under the condition where the second predetermined number of times is set, and the above-mentioned first predetermined number of times is set. It is also possible to control to switch from a state in which the detection process is performed under the predetermined condition to a state in which the detection process is performed in parallel under the condition in which the first predetermined number of times is set and the condition in which the second predetermined number of times is set. Is possible.

  At that time, whether or not to change the threshold value as in the first modification is determined at the same time as the switching control of the detection processing condition of the radiographic imaging apparatus 1 by the console 58.

[effect]
For example, when it is known in advance that the imaging to be performed is a normal imaging in which the irradiation time of radiation is not as short as, for example, a newborn imaging, the first predetermined number of times set for the normal imaging (for example, (4 times) The condition that the first predetermined number of times is set without performing the radiation irradiation start detection process under the condition that the second predetermined number of times (for example, two times) set to a smaller number of times is set. By setting so that the detection process is performed at, it is possible to detect the start of radiation irradiation sufficiently accurately.

  In addition, when it is known in advance that imaging to be performed from now on is imaging with a short radiation exposure time, such as neonatal imaging, the first predetermined number of times set for normal imaging (for example, 4 times) ) The radiation irradiation start detection process under the condition that the second predetermined number of times (for example, two times) set to a smaller number of times is set alone or in parallel with the condition for which the first predetermined number of times is set By setting so as to perform the above, the start of radiation irradiation can be detected sufficiently accurately even when the radiation irradiation time is short.

  Therefore, by configuring as in the second embodiment described above, it is possible to start radiation irradiation in both cases of normal imaging and imaging with a short irradiation time such as neonatal imaging. It becomes possible to detect accurately.

[Modification 2]
In addition, noise is superimposed on the read leak data dleak (acquired target value) mainly because the radiographic image capturing apparatus 1 is inserted between the bed B and the body of the patient H or the patient H's body. When the body is placed on the body (see, for example, FIG. 6) and the radiographic imaging apparatus 1 is positioned with respect to the subject, the radiographic imaging apparatus 1 is shocked or vibrated by hitting the radiographic imaging apparatus 1 against a bed B or the like. Etc. are added.

  Therefore, for example, until the positioning of the radiographic image capturing apparatus 1 is completed, the control unit 22 (that is, the detection unit) of the radiographic image capturing apparatus 1 is configured not to perform the radiation irradiation start detection process, that is, leak data. It is configured not to perform read processing (acquisition processing) of dleak (target value), for example, positioning is completed, and an operation (for example, an operation of transmitting a signal from a portable terminal (not shown) to the console 58 from an operator such as a radiologist It is also possible to configure the radiation image capturing apparatus 1 to start detection processing of radiation irradiation by transmitting a signal from the console 58 to the radiation image capturing apparatus 1 or the like. .

  If comprised in this way, after positioning of the radiographic imaging device 1 is completed, since possibility that an impact, a vibration, etc. will be added to the radiographic imaging device 1 becomes low, leak data dleak with which noise was superimposed becomes threshold value dleak_th. The possibility of becoming above is also reduced. Therefore, it is possible to accurately reduce the possibility of erroneous detection of the start of radiation irradiation.

  It should be noted that the console 58 that has received the action from the operator as described above performs control of switching the detection processing condition of the radiographic imaging device 1 by the console 58, and detection processing for detecting the start of radiation irradiation to the radiographic imaging device 1. May be configured to be performed at the same time as the start of the operation, or the console 58 may be configured to control the switching of the detection processing conditions of the radiation imaging apparatus 1 in advance prior to this time. It is.

[Third Embodiment]
In the first and second embodiments described above, the radiation image capturing apparatus 1 has the second predetermined number set to a number less than the first predetermined number of times (for example, four times) set for at least normal imaging. By performing the detection process of the start of radiation irradiation under the condition where the number of times (for example, twice) is set, the configuration is such that the start of radiation irradiation can be accurately detected even in the case of imaging with a short radiation exposure time. Explained when to do.

  Next, in the third embodiment described below, the method of image correction in the radiation image generation process in the image processing apparatus based on the image data D captured by the radiation image capturing apparatus 1 is changed slightly. By changing, even if the radiation irradiation time is very short, the radiation imaging apparatus 1 accurately detects the start of radiation irradiation, and the image data D read out by the radiation imaging apparatus 1 A method of processing that enables accurate generation of a radiographic image based on the above will be described.

  As in the first and second embodiments, the console 58 (see FIG. 6) is also configured to function as an image processing apparatus in this embodiment, and is hereinafter referred to as an image processing apparatus 58. However, the image processing apparatus can also be configured as a separate apparatus from the console 58, and the present invention can be applied to this case as well.

  Further, as described above, in the first and second embodiments described above, it is possible not to perform the reset processing of each radiation detection element 7 before imaging, but in the third embodiment, It is an essential requirement to perform reset processing of each radiation detection element 7 for imaging. Instead of performing the reset process of each radiation detection element 7 before imaging, the charge is released from each radiation detection element 7 in the same manner as the reset process, but the released charge is read as the irradiation start detection data d described above. It is also possible to configure so as to perform reading processing of the irradiation start detection data d.

  In any case, in the third embodiment, as will be described below, each radiation detection element 7 is reset by irradiation of the radiation detection process 7 and reading start of the irradiation start detection data d. It is essential that a part of the charge generated in the detection element 7 flows out of each radiation detection element 7.

  Therefore, in the third embodiment, the control unit 22 (that is, the detection unit) of the radiographic image capturing apparatus 1 moves from the scan driving unit 15 (see FIG. 3) to each of the lines L1 to Lx of the scan line 5 for imaging. The reset processing of each radiation detection element 7 performed by sequentially applying the ON voltage and the target value acquisition processing (that is, reading processing of leak data dleak by the reading circuit 17, for example) are alternately performed.

  Alternatively, the control unit 22 of the radiographic image capturing apparatus 1 sequentially applies on-voltages to the respective lines L1 to Lx of the scanning line 5 from the scanning driving unit 15 (see FIG. 3) for imaging, and the readout circuit 17 The irradiation start detection data d is read (that is, the target value acquisition process) is performed. In the third embodiment, the case where the leak data dleak is read will be described as an example.

[Assumptions]
Hereinafter, by changing the above-mentioned matters, that is, the manner of image correction in the image processing apparatus, the radiation image capturing apparatus 1 can accurately detect the start of radiation irradiation even when the radiation irradiation time is short. Before explaining that, the presupposed matters will be explained.

  As described above, in the first and second embodiments, as described above, the start of radiation irradiation is detected immediately after the leak data dleak read out in a certain readout process becomes equal to or greater than the threshold dleak_th. Without this, there is a possibility that the irradiation of radiation data has been continuously started to become equal to or more than the threshold value dleak_th in a predetermined number of times (for example, four times or two times) of reading processing of the leak data dleak including this time of reading processing. Only when it is determined that there is a radiation start of radiation is detected.

  Therefore, as described above, in the case where the reading process of leak data dleak and the reset process of each radiation detection element 7 are alternately performed for imaging, the radiation from the radiation generator 55 (see FIG. 6) is used. Even if the leakage data dleak read out by the reading process in the radiographic imaging device 1 becomes equal to or greater than the threshold value dleak_th, the radiographic imaging device 1 does not immediately detect the irradiation of radiation. The reset process of the radiation detection element 7 is continued without being stopped.

  Then, when it is determined that there is a possibility that radiation irradiation has been started continuously in a predetermined number of times (for example, four times or twice) of reading the leak data dleak, and the start of radiation irradiation is detected, At last, the reset process of each radiation detection element 7 is stopped. Then, each TFT 8 is turned off and shifts to a charge accumulation state (see FIG. 11).

  In other words, when configured as in the first and second embodiments described above, even if irradiation of radiation from the radiation generation device 55 is started, thereafter, for example, reading processing of leak data dleak is performed four times or twice. Done. And in 3rd Embodiment, since the reading process of leak data dleak and the reset process of each radiation detection element 7 are performed alternately as mentioned above, irradiation of the radiation imaging device 1 is started. Therefore, for example, the reset processing of each radiation detection element 7 is performed about four times or twice.

  In the following, for easy understanding of the explanation, the radiation processing of the radiation image sensing device 1 is started four times, and then the reset processing of each radiation detection element 7 is performed four times (that is, four scanning lines in the reset processing). 5 is applied).

  Now, for example, consider a case in which a certain intensity of radiation is uniformly applied to the entire radiation incident surface R (see FIG. 1) of the radiation imaging apparatus 1. For example, the radiation image capturing apparatus 1 is reset with respect to the radiation image capturing apparatus 1 only for a time corresponding to the time when the on-voltage is sequentially applied to the 100 scanning lines 5, for example. Consider the case of irradiation. In the following description, “the time corresponding to the time for performing the reset process by sequentially applying the ON voltage to the 100 scanning lines 5” and the like are abbreviated as “the time for 100 lines” and the like. To do.

  In this case, during radiation irradiation, the radiation voltage is generated and accumulated in each radiation detection element 7 connected to the scanning line 5 where no on-voltage is applied for reset processing. Assuming that the ratio of charges to be 100%, as described above, each radiation detection element 7 connected to the scanning line 5 to which the on-voltage is first applied for the reset process after the radiation irradiation is started. Then, out of the irradiation time for 100 lines, the charge generated and accumulated in the irradiation time for one line is removed from each radiation detection element 7 by the reset process, and generated for the subsequent irradiation time for 99 lines. Charge is accumulated in each radiation detection element 7.

  Therefore, only 99% of the charges are accumulated in each of the radiation detection elements 7. Then, the image data D read from each of the radiation detection elements 7 in the subsequent reading process of the image data D (see FIG. 11) is connected to the scanning line 5 to which no ON voltage was applied during radiation irradiation. If the image data D read from each radiation detecting element 7 is 100%, only 99% of the image data D is read out.

  Similarly, in each radiation detection element 7 connected to the scanning line 5 to which the second to fourth on-voltages are applied for the reset process after the radiation irradiation is started, the irradiation time for 100 lines. Among them, the charge generated and accumulated in the irradiation time for 2 lines to 4 lines is removed from each radiation detection element 7 by the reset process, and generated in the irradiation time for 98 lines to 96 lines thereafter. Charge is accumulated in each radiation detection element 7.

  Therefore, only a charge of 98% to 96% is accumulated in each of these radiation detection elements 7, and the image data D read from each of these radiation detection elements 7 in the subsequent reading process of the image data D is radiation. If the image data D read from each radiation detection element 7 connected to the scanning line 5 to which no ON voltage was applied during irradiation of 100% is 100%, only 98% to 96% of the image data D can be read. become.

  In this phenomenon, the line number of the scanning line 5 to which the on-voltage is applied for the reset processing is set to n to n + 3, the horizontal axis represents the line number m of the scanning line 5, and the vertical axis represents the image data D (however, displayed as a ratio). Is represented in the graph, the ratio of the image data D in the scanning line 5 near the scanning line 5 of the line number n is as shown in FIG.

  In this case, even the image data D read out from each radiation detection element 7 connected to the scanning line 5 of line number n + 3 is connected to the scanning line 5 to which no on-voltage was applied during radiation irradiation. The image data D read from each of the radiation detection elements 7 is only reduced to about 96%.

  For this reason, since the degree of loss of the image data D is small, it is read out from each radiation detection element 7 connected to each scanning line 5 of line numbers n to n + 3 when the image processing apparatus 58 generates a radiation image. There is a possibility that the process of restoring the image data D whose value has decreased may not be performed on the image data D that has been processed.

  Further, the image processing device 58 may be configured to perform processing for restoring the values of the image data D whose values have been reduced to the original values. In that case, in actual imaging, unlike the case where the radiation image capturing apparatus 1 is uniformly irradiated with radiation and the image data D having a substantially uniform value is read out as described above, information on the subject is carried and each radiation is captured. Since image data D having a different size for each detection element 7 is read out, it is necessary to perform image correction in consideration thereof.

  Therefore, for example, a precise image correction method described in Japanese Patent Application Laid-Open No. 2012-191599 may be adopted as a process of restoring the image data D whose value has decreased with respect to the image data D carrying the subject information. Is possible. However, the process of restoring the image data D whose value has decreased is not limited to this method, and an appropriate image correction method can be adopted.

  On the other hand, considering the case where the radiation irradiation time for the radiographic imaging apparatus 1 is not the time for 100 lines as described above, for example, the time for eight shorter lines, the radiation irradiation is started. In each radiation detection element 7 connected to the scanning line 5 (line number is n) to which the ON voltage is first applied for the reset process, the irradiation time for one line out of the irradiation time for eight lines. The charges generated and accumulated in step 1 are removed from each radiation detection element 7 by the reset process, and the charges generated in the irradiation time for the subsequent seven lines are accumulated in each radiation detection element 7.

  Therefore, charges of a ratio of 7/8 = 87.5% are accumulated in each of these radiation detection elements 7, and as shown in FIG. The image data D read from the radiation detection element 7 is also 87.5 compared to the image data D read from each radiation detection element 7 connected to the scanning line 5 to which no ON voltage was applied during radiation irradiation. % Image data D is read out.

  Similarly, each radiation detecting element 7 connected to the scanning line 5 (line number is n + 1 to n + 3) to which the second to fourth on-voltage is applied for the reset process after the radiation irradiation is started. Then, out of the irradiation time for 8 lines, the charges generated and accumulated in the irradiation time for 2 lines to 4 lines are removed from each radiation detection element 7 by the reset process, and the subsequent 6 lines to 4 Electric charges generated during the irradiation time for the line are accumulated in each radiation detection element 7.

  Therefore, only charges of a ratio of 6/8 = 75% to 4/8 = 50% are accumulated in each of these radiation detection elements 7, and from each of these radiation detection elements 7 in the subsequent read processing of the image data D. As shown in FIG. 13, only 75% to 50% of image data D is read out.

  And the ratio of the image data D read out in this way is 87 with respect to the image data D read out from each radiation detection element 7 connected to the scanning line 5 to which the ON voltage was not applied during radiation irradiation. When the value is reduced to about 5% to 50%, the value is usually obtained by using, for example, the image correction method described in JP 2012-191599 A described above in the radiation image generation processing in the subsequent image processing apparatus 58. The process of restoring the image data D having decreased to the original value is performed.

  On the other hand, as described above, when the ratio of the image data D read from each radiation detection element 7 connected to a certain scanning line 5 becomes small, the S / N ratio deteriorates. When such image data D is restored to its original value as described above, noise is also amplified at the same time. Therefore, even if the image data D of each radiation detection element 7 connected to the scanning line 5 can be restored to the original value, noise increases at the same time, so that the scanning line 5 in the generated radiation image In a corresponding portion, a pixel in which noise is abnormally larger than that of surrounding pixels appears in a linear shape.

  Therefore, in order to prevent such a problem from occurring, usually, a lower limit is set in the ratio of the image data D that is a target for performing the process of restoring the image data D whose value has decreased. As described above, when the lower limit ratio is restored to the original image data D, even if noise is amplified at the same time, in the generated radiographic image, the noise of the pixels in that portion It is set as a minimum ratio that can prevent recognition as being larger than the noise of the pixel.

  Note that the S / N ratio of the image data D of each radiation detection element 7 is determined by the configuration of the radiation detection element 7 and the readout circuit 17 of the radiation image capturing apparatus 1. For this reason, what ratio is set as the lower limit ratio of the image data D to be subjected to the process of restoring the image data D whose value has decreased usually differs depending on the specifications of the radiation image capturing apparatus 1.

  As can be seen from the above consideration, when the reset processing of each radiation detection element 7 is performed four times after the radiation irradiation to the radiation image capturing apparatus 1 is started as described above, the reset processing of the fourth time is performed. The ratio of the image data D read from each radiation detection element 7 connected to the scanning line 5 to which the ON voltage is applied, that is, the scanning line 5 with the line number n + 3 in the examples of FIGS. 12 and 13 is the lowest.

  Therefore, if the lower limit ratio of the image data D to be subjected to the process of restoring the image data D whose value is reduced is, for example, 50%, the line number is connected to the scanning line 5 of n + 3. The ratio of the image data D read from each radiation detection element 7 needs to be 50% or more.

  Then, as can be seen by comparing FIG. 12 when the irradiation time is 100 lines and FIG. 13 when the irradiation time is 8 lines, the line number becomes n + 3 as the radiation irradiation time becomes shorter. The ratio of the image data D read from each radiation detection element 7 connected to the scanning line 5 becomes low.

  Therefore, in order for the ratio of the image data D read from each radiation detection element 7 connected to the scanning line 5 with the line number n + 3 to be 50% or more, which is the lower limit ratio, the radiation image capturing apparatus 1 is not affected. The irradiation time of the radiation needs to be 8 lines or more.

  In other words, as in the first and second embodiments, the leak data dleak is read continuously for a first predetermined number of times (for example, four times) (that is, the target value is acquired a predetermined number of times). When it is configured to detect the start of radiation irradiation for the first time when it is determined that there is a possibility that radiation irradiation has started, each radiation detection element 7 is reset during radiation irradiation to the radiation imaging apparatus 1. There is a possibility that the process is performed four times. In this case, image data D whose value has been reduced by four reset processes (that is, image data D read from each radiation detection element 7 connected to each scanning line 5 having line numbers n to n + 3). If the processing for restoring the original values is performed, the radiation voltage is applied to the radiation image capturing apparatus 1 for 8 lines (that is, on-line voltages are sequentially applied to the 8 scanning lines 5 at the time of imaging). It is necessary to irradiate the radiation for a time equal to or longer than the time corresponding to the time for resetting the detection element 7.

  In the first and second embodiments, radiation is determined when it is determined that there is a possibility that radiation irradiation has been started continuously in the second predetermined number of times (for example, twice) of reading the leak data dleak. The configuration for detecting the start of irradiation was also described. In this case as well, the reset processing of each radiation detection element 7 may be performed twice during radiation irradiation of the radiation image capturing apparatus 1.

  In this case, as shown in FIG. 14, the value of the image data D read from each radiation detection element 7 connected to each scanning line 5 with line numbers n to n + 1 decreases. Similarly to the above, image data D whose value has been reduced by two reset processes, that is, image data D read from each radiation detection element 7 connected to each scanning line 5 with line numbers n to n + 1 is obtained. If processing for restoring the original values is performed, it is necessary to irradiate the radiation image capturing apparatus 1 with radiation for a time of four lines or more at the time of imaging.

  That is, even if the second predetermined number of times in the radiation irradiation start detection processing is configured as in the first and second embodiments, for example, twice as described above, the radiation irradiation time at the time of imaging Is very short and, for example, when the irradiation time is less than the time of 4 lines, there is a possibility that the process of restoring the image data D whose value has decreased to the original value cannot be performed accurately. There is a possibility that the radiographic image cannot be generated accurately.

  Needless to say, as described above, the minimum irradiation time of radiation changes according to the lower limit ratio of the recoverable image data D. As can be seen from the above consideration, the minimum irradiation time can be shortened as the lower limit ratio is smaller. Therefore, for example, it is possible to improve the configuration of the radiation image capturing apparatus 1 to improve the S / N ratio of the image data D and further reduce the lower limit ratio, and so on. Such improvements are made as appropriate.

[Configurations Specific to this Embodiment]
In the radiographic image capturing system 50 according to the present embodiment, as the image correction method in the generation process of the radiographic image in the image processing device 58 based on the image data D captured by the radiographic image capturing device 1, the image correction as described above is performed. Instead of adopting this method as it is, the method of image correction is changed. Then, by changing the image correction method, the radiation image capturing apparatus 1 starts radiation irradiation even when the radiation irradiation time is very short, for example, less than the time of four lines as described above. Is accurately detected, and a radiographic image is accurately generated by the image processing device 58 based on the image data D read by the radiographic image capturing device 1.

  Specifically, in the present embodiment, the scanning line 5 to which the ON voltage is applied in the reset process of each radiation detection element 7 performed during radiation irradiation, that is, the line number is n to n + 3 (or n to n + 1). Among each scanning line 5, from each radiation detecting element 7 connected to the scanning line 5 other than the scanning line 5 to which the on-voltage is applied last, that is, the scanning line 5 whose line number is n to n + 2 (or n). For the read image data D, the image data D whose value has been reduced is changed to the original image data by using, for example, an image correction method described in Japanese Patent Application Laid-Open No. 2012-191599. Process to restore to.

  However, the image data D read from each radiation detection element 7 connected to the scanning line 5 to which the on-voltage is applied last, that is, the scanning line 5 having the line number n + 3 (or n + 1) is described above. Such processing is discarded without being performed, and a so-called line defect is formed as shown in FIG. The image data D of the scanning line 5 as the line defect is connected to the scanning line 5 in the vicinity of the scanning line 5 of the line defect (that is, the scanning line 5 having a line number of n + 2 or n + 4). Based on the image data D read from the radiation detection element 7 and the image data D restored as described above, for example, linear interpolation is performed to correct line defects.

  In this regard, first, the readout process of the leak data dleak is performed four times, which is the first predetermined number during the radiation irradiation, and the four scanning lines 5 are reset by resetting each radiation detection element 7 during the radiation irradiation. A case where an on-voltage is applied to will be described.

  As described above, when the scanning line 5 having the line number n + 3 to which the ON voltage is applied last during radiation irradiation is a line defect, each line connected to the scanning line 5 is shown in FIG. The ratio of the image data D read from the radiation detection element 7 is not necessarily equal to or more than the above lower limit ratio (that is, for example, 50%) because the scanning line 5 is a line defect. It may be lower.

  However, assuming that the scanning line 5 with the line number n + 2 applied immediately before the scanning line 5 with the line number n + 3 applied last is also a line defect, for example, as shown in FIG. As described above, the line defects are continuously arranged on the radiographic image.

  Then, as described above, the image data D of the scanning lines Ln + 2 and Ln + 3 of those line defects is discarded, and the scanning lines 5 in the vicinity of the scanning lines Ln + 2 and Ln + 3 (ie, for example, scanning) If the line defect is corrected based on the image data D etc. of the lines Ln + 1, Ln + 4, etc., an important image such as a lesioned part of the patient is photographed in the part where the line defects are continuously generated. However, when the line defect is corrected as described above, the lesioned part or the like that should have been photographed is lost from the image data D due to the line defect correction, and the lesioned part is photographed in the generated radiation image. There is a possibility that it will not be in the state.

  Therefore, in the present embodiment, as described above, only the scanning line Ln + 3 to which the on-voltage is applied last during radiation irradiation is regarded as a line defect, and the other scanning lines 5 are not treated as line defects. It has become.

  When configured as described above, as shown in FIG. 16, the scanning line Ln + 2 to which the on-voltage is applied immediately before the scanning line Ln + 3 to which the on-voltage is last applied during radiation irradiation is as follows. The ratio of the image data D read from each radiation detection element 7 connected to it needs to be equal to or higher than the lower limit ratio (for example, 50%).

  The radiation irradiation time necessary for the ratio of the image data D read from each radiation detection element 7 connected to the scanning line Ln + 2 to be equal to or higher than the lower limit ratio can be understood from the above consideration. When the lower limit ratio is 50% as described above, the irradiation time for 6 lines, that is, the time corresponding to the time for performing the reset process by sequentially applying the ON voltage to the six scanning lines 5 is used. That's it.

  That is, the on-voltage is applied in the reset process during the irradiation of radiation as described above without using the image correction method for restoring the image data D whose value has decreased and the line defect correction of the present embodiment. When only the process of restoring the image data D whose values have decreased for all the scanning lines Ln to Ln + 3 is performed (see FIG. 13 and the like), the radiation irradiation time at the time of imaging is originally a time corresponding to 8 lines. Although it was necessary to be as described above, if the image correction method of the present embodiment is adopted, as described above, the irradiation time of radiation at the time of imaging may be longer than the time for 6 lines. It turns out that.

[effect]
As described above, when the image correction method of the present embodiment is employed, even when the radiation irradiation time is shorter, the radiation image capturing apparatus 1 can accurately detect the start of radiation irradiation and perform imaging. It becomes possible. Then, the image data D photographed by the radiation image photographing apparatus 1 as described above can be accurately corrected by the image processing apparatus 58, and a radiation image can be accurately generated.

  In addition, the beneficial effect described above is that the radiation irradiation is judged to have been started in the second predetermined number of times described above, that is, for example, in the leak data dleak read processing of two times. The same holds true when the start is detected.

  That is, as shown in FIG. 17, since the scanning line Ln + 1 to which the on-voltage is applied last during radiation irradiation is a line defect, it may be lower than the lower limit ratio (ie, 50%, for example) Finally, the ratio of the image data D read from each radiation detection element 7 connected to the scanning line Ln to which the on-voltage is applied immediately before the scanning line Ln + 1 to which the on-voltage is applied is equal to or more than the lower limit ratio. It only has to be.

  Then, the irradiation time of radiation required for the ratio of the image data D read from each radiation detection element 7 connected to the scanning line Ln to be equal to or higher than the lower limit ratio may be an irradiation time for two lines. Strictly speaking, in this case, if the irradiation time of radiation is an irradiation time for two lines, the leakage data dleak is read out after the on-voltage is applied to the scanning line Ln + 1 during the irradiation of radiation. At this point in time, there is a possibility that the irradiation of radiation has already been completed. In this case, the irradiation time of radiation may need to be an irradiation time for three lines.

  However, in any case, the image correction method for restoring the image data D whose value has decreased and the line defect correction of the present embodiment are not adopted, and the reset process is turned on during radiation irradiation as described above. When only the process of restoring the image data D whose values have decreased for all the scanning lines Ln to Ln + 1 to which the voltage is applied is performed (see FIG. 14), the radiation irradiation time at the time of imaging is originally 4 lines. Considering that it was necessary to be longer than a minute, if the above-described image correction method of the present embodiment is adopted, the radiation irradiation time necessary for imaging is still the image correction of the present embodiment. The case where the method is adopted is shorter than the case where the image correction method according to the present embodiment is not adopted.

  Therefore, even when the radiation irradiation time is shorter, it is possible to accurately detect the start of radiation irradiation with the radiation image capturing apparatus 1 and perform imaging, and the image correction method of the present embodiment is adopted. Then, the image data D captured by the radiation image capturing apparatus 1 can be accurately corrected by the image processing apparatus 58, and a radiation image can be accurately generated.

  As a method for correcting the line defect of the image data D of the line defect portion, in the above, the lowered value is connected to the restored image data D (that is, the scanning line Ln + 2 and the like in FIG. 15A). The case of correcting the line defect using the image data D) of each radiation detection element 7 has been described. However, the image data D of the line defect portion is converted into the line data using the image data D having a reduced value before the restoration. It is also possible to perform the defect correction, and the method of correcting the line defect of the image data D of the line defect portion is not limited to a specific method.

[Modification 3]
In the case of the configuration as in the first to third embodiments, for example, it is possible to execute the radiographing on the display unit 58 of the console 58 as long as the radiation irradiation time is taken, that is, radiation. It is possible to display the shortest time that can be taken as the irradiation time and notify an operator such as a radiologist.

  Further, as described above, when the radiographic imaging system 50 according to each of the above embodiments is constructed on the round wheel 71 (see FIG. 6), the radiation generator 55 on the round wheel 71 uses the radiation source 52 to the radiation. In many cases, it is configured to set a tube current time product (that is, a product of a tube current [mA] and an irradiation time [s], also referred to as mAs).

  Therefore, a predetermined tube current time product is set in advance and irradiated with radiation, and the relationship between the tube current time product and the radiation irradiation time in the round wheel 71 is obtained. And, for example, the shortest irradiation that can be set by the radiation generator 55 of the round wheel 71 from the lower limit value of the tube current time product that can be set to the radiation generation 55 on the round wheel 71 and the above-described relationship. Calculate time. The lower limit value of the tube current time product that can be set by the radiation generator 55 of the round wheel 71 and the shortest irradiation time corresponding to the lower limit value are displayed on the display unit 58a of the console 58 for notification. Is also possible.

  If comprised in this way, operators, such as a radiographer, will judge appropriately whether imaging can be performed based on the reported lower limit of the tube current time product and the corresponding irradiation time of radiation. It becomes possible to do.

  In addition, for example, the console 58 calculates the shortest irradiation time that can be set by the radiation generator 55 of the round wheel 71 as described above, and the operator operates an input means such as a keyboard or obtains imaging order information. The irradiation time of radiation is calculated from the imaging conditions specified by selection. If the radiation irradiation time calculated based on the designated imaging condition is shorter than the shortest irradiation time that can be set by the radiation generator 55 of the round wheel 71, the rounding wheel 71 is designated. It may be configured to notify that the shooting of the condition cannot be performed, for example, by displaying it on the display unit 58a.

  Needless to say, the present invention is not limited to the above-described embodiments and modifications, and can be appropriately changed without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Radiographic imaging apparatus 5, Ln-Ln + 3 Scan line 6 Signal line 7 Radiation detection element 8 TFT (switch element)
15 Scanning drive means 17 Reading circuit 22 Control means (detection means)
50 Radiation imaging system 58 Console (image processing device)
D Image data d Irradiation start detection data (target value)
dleak leak data (target value)
dleak_th threshold q charge

Claims (5)

A plurality of scanning lines and a plurality of signal lines;
A plurality of radiation detection elements arranged two-dimensionally;
Scanning drive means for switching on and applying an on-voltage and an off-voltage to each scanning line;
A switch element connected to each of the scanning lines, and discharging a charge accumulated in the radiation detection element to the signal line when an on-voltage is applied;
A readout circuit that converts the electric charge emitted from the radiation detection element into image data and reads the image data;
Detecting means for determining the possibility that radiation irradiation has been started based on the target value each time a target value that varies due to radiation irradiation is acquired;
With
The detection means includes
It is configured to detect the start of radiation irradiation when it is determined that there is a possibility that radiation irradiation has been started continuously in the predetermined number of times of acquisition processing of the target value,
In addition, the detection process of the start of radiation irradiation is set to a condition in which the first predetermined number of times set for normal imaging is set as the predetermined number of times and a number of times smaller than the first predetermined number of times. And a plurality of conditions including a condition for which the second predetermined number of times is set,
Radiographic imaging, wherein the start of radiation irradiation is detected when the start of radiation irradiation is detected in at least one of the detection processes performed under the plurality of conditions. apparatus. The detection means is configured to determine that there is a possibility that radiation has been started when the target value is equal to or greater than a set threshold value,
The threshold value in the detection process performed under the second predetermined number of times is set to a value larger than the threshold value in the detection process performed at the first predetermined number of times. The radiographic imaging apparatus according to 1. A plurality of scanning lines and a plurality of signal lines;
A plurality of radiation detection elements arranged two-dimensionally;
Scanning drive means for switching on and applying an on-voltage and an off-voltage to each scanning line;
A switch element connected to each of the scanning lines, and discharging a charge accumulated in the radiation detection element to the signal line when an on-voltage is applied;
A readout circuit that converts the electric charge emitted from the radiation detection element into image data and reads the image data;
Detecting means for determining the possibility that radiation irradiation has been started based on the target value each time a target value that varies due to radiation irradiation is acquired;
A radiographic imaging device comprising:
A console for controlling the radiographic apparatus,
With
The detection means of the radiographic image capturing apparatus includes:
It is configured to detect the start of radiation irradiation when it is determined that there is a possibility that radiation irradiation has been started continuously in the predetermined number of times of acquisition processing of the target value,
In addition, the detection process of the start of radiation irradiation is set to a condition in which the first predetermined number of times set for normal imaging is set as the predetermined number of times and a number of times smaller than the first predetermined number of times. The second predetermined number of times can be performed under a plurality of conditions including a set condition,
The console controls the radiographic imaging apparatus to perform the detection process under a condition in which the second predetermined number of times is set when imaging with a short irradiation time of radiation is designated. Radiation imaging system. A plurality of scanning lines and a plurality of signal lines;
A plurality of radiation detection elements arranged two-dimensionally;
Scanning drive means for switching on and applying an on-voltage and an off-voltage to each scanning line;
A switch element connected to each of the scanning lines, and discharging a charge accumulated in the radiation detection element to the signal line when an on-voltage is applied;
A readout circuit that converts the electric charge emitted from the radiation detection element into image data and reads the image data;
Detecting means for determining the possibility of starting radiation irradiation based on the target value every time a target value that varies due to radiation irradiation is acquired;
A radiographic imaging device comprising:
An image processing device for generating a radiographic image based on the image data transmitted from the radiographic imaging device;
With
The detection means of the radiographic image capturing apparatus includes:
For imaging, the radiation detection element reset processing performed by sequentially applying an on-voltage to each scanning line from the scanning drive unit, and the target value acquisition processing are alternately performed,
It is configured to detect the start of radiation irradiation when it is determined that there is a possibility that radiation irradiation has been started continuously in the predetermined number of times of acquisition processing of the target value,
The image processing apparatus includes:
The on-voltage is applied in the reset process of each radiation detection element performed immediately before the acquisition process other than the last acquisition process among the predetermined number of acquisition processes of the target value in the radiographic imaging device For the image data read from each of the radiation detection elements connected to the scanning line, a process for restoring the image data whose value has decreased is performed,
For the image data read from each radiation detection element connected to the scanning line to which the on-voltage is applied in the reset process of each radiation detection element performed immediately before the last acquisition process, A radiographic imaging system, wherein a line defect is corrected based on the image data of each radiation detecting element connected to the scanning line in the vicinity of the scanning line. The detection means of the radiographic image capturing apparatus includes:
For imaging, instead of resetting each radiation detection element, an on-voltage is sequentially applied from the scanning drive unit to each scanning line, and the readout circuit performs readout processing of irradiation start detection data,
As the target value, the irradiation start detection data, or a value calculated based on the irradiation start detection data is used,
The image processing apparatus includes:
The on-voltage was applied during the reading process of the irradiation start detection data performed as the acquisition process other than the last acquisition process among the predetermined number of acquisition processes of the target value in the radiographic imaging device For the image data read from each of the radiation detection elements connected to the scanning line, perform a process of restoring the image data whose value has decreased,
Regarding the image data read from each radiation detection element connected to the scanning line to which an on-voltage is applied during the reading process of the irradiation start detection data performed as the last acquisition process The radiation image capturing system according to claim 4, wherein line defect correction is performed based on the image data of each radiation detection element connected to the scanning line in the vicinity of the scanning line.

Images