JP2012049665A - Radiation image photographing apparatus and radiation image photographing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiation image photographing apparatus that can surely prevent values of the read image data from becoming abnormal even in the case of occurrence of a break in a scan line.SOLUTION: A radiation image photographing apparatus 1 comprise scan drive means 15 that, in the readout process for reading image data D from each radiation detection element 7, sequentially applies an ON voltage to scan lines 5 to sequentially apply an ON voltage to switch means 8 connected to each scan lines 5. In the case of presence of a break in a scan line 5, when readout process for image data D follows radiation image photographing performed by emitting radiation, which readout process is performed by sequentially applying an ON voltage to each scan lines 5 connected with a radiation detection element, the scan drive means 15 delays the initiation timing of the readout process for image data D in comparison with the initiation timing in the case of no break in a scan line 5.

Description

  The present invention relates to a radiographic image capturing apparatus and a radiographic image capturing system.

  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 or the like. Various types of so-called indirect radiographic imaging devices have been developed that convert charges into electromagnetic signals after they have been converted into electromagnetic waves of a wavelength, and then generated by photoelectric conversion elements such as photodiodes in accordance with the energy of the converted and irradiated electromagnetic waves. Yes. 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 imaging apparatus is known as an FPD (Flat Panel Detector), and conventionally formed integrally with a support base (or a bucky apparatus) (see, for example, Patent Document 1). A portable radiographic imaging device in which an element or the like is housed in a housing has been developed and put into practical use (see, for example, Patent Documents 2 and 3).

  In such a radiographic imaging apparatus, for example, as shown in FIG. 4 and FIG. 7 to be described later, usually, a plurality of scanning lines 5 and a plurality of signal lines 6 are wired on the substrate 4 so as to cross each other, and scanned. Each radiation detection element 7 is arranged in each region r partitioned by the line 5 and the signal line 6, and the radiation detection element 7 is arranged on the detection part P in a two-dimensional form (matrix form).

  A thin film transistor (hereinafter referred to as TFT) 8 is connected to each radiation detection element 7 as a switching means, and the TFT 8 is turned on / off by applying an ON voltage or an OFF voltage to the scanning line 5. Operates off. When the TFT 8 is in an off state, charges generated in the radiation detection element 7 are accumulated in the radiation detection element 7. When the TFT 8 is in an on state, the charges accumulated in the radiation detection element 7 are signaled via the TFT 8. It is configured to be emitted to the line 6.

  For example, in the image data reading process after the radiation image capturing apparatus is irradiated with radiation and the radiation image capturing is performed, the signal reading signal is read from the gate driver 15b (see FIG. 7 described later) of the scanning drive unit 15. The on-voltage is sequentially applied to each scanning line 5 while sequentially switching the lines L1 to Lx of the scanning line 5 to which the on-voltage is applied, and from each radiation detection element 7 via the TFT 8 that is turned on at each timing. The charge accumulated therein is discharged to the signal line 6 and is read out as image data by charge-voltage conversion by the readout circuit 17.

  In the radiographic image capturing apparatus, input / output terminals 11 are connected to end portions of the scanning lines 5 (see FIG. 4) on the substrate 4. For example, as shown in FIG. The sensor panel SP may be configured by connecting a COF (Chip On Film) 12 to the COF 12 and connecting the COF 12 to, for example, a circuit board such as a PCB board 33 on the back side of the board 4 (for example, a patent). Reference 4).

JP-A-9-73144 JP 2006-058124 A JP-A-6-342099 JP 2009-219538 A

  By the way, for example, if a certain scanning line 5 is disconnected on the substrate 4 or is disconnected at the connection portion between the input / output terminal 11 and the COF 12, the gate driver 15b (see FIG. 7) changes the disconnected scanning line 5 to the disconnected scanning line 5. Even if an on voltage or an off voltage is applied, neither the on voltage nor the off voltage can be applied to the scanning line 5.

  In this manner, since neither the on-voltage nor the off-voltage can be applied to the disconnected scanning line 5, the disconnected scanning line 5 enters a so-called floating state in which neither the on-voltage nor the off-voltage is applied. For this reason, neither the on-voltage nor the off-voltage is applied to each TFT 8 connected to the scanning line 5.

  When the TFT 8 is in such a floating state, the TFT 8 cannot block the charge accumulated in the radiation detection element 7 from flowing out from the radiation detection element 7 to the signal line 6. The generated charge flows out to the signal line 6 through the TFT 8.

  Therefore, for example, when radiographic imaging apparatus is irradiated with radiation and charge is generated by irradiation of radiation within each radiation detection element 7 during radiographic imaging, each radiation detection connected to the disconnected scanning line 5 is detected. Electric charge immediately flows out from the element 7 to the signal line 6 through the TFT 8 which is in a floating state.

  Then, in the reading process of the image data after radiographic imaging, as described above, the on-voltage is applied to the scanning line 5 that is not disconnected and the TFT 8 connected thereto is turned on, so that the TFT 8 The charge to be read out as image data from the radiation detection element 7 is released to the signal line 6 via the, and flows out from the radiation detection element 7 connected to the scanning line 5 disconnected as described above. Will be superimposed.

  For this reason, the read image data has an abnormal value. In particular, image data read out until the electric charge completely flows out from each radiation detection element 7 connected to the disconnected scanning line 5, that is, while the electric charge continues to flow out from each radiation detection element 7. There is a risk of abnormal values.

  Accordingly, the reliability of the image data obtained by using the radiographic imaging device in which the scanning lines 5 are disconnected as described above is lowered, and for example, a radiographic image generated based on such image data is used for medical diagnosis or the like. In such a case, even the reliability of diagnosis may be reduced.

  The present invention has been made in view of the above-described problems, and even if a disconnection occurs in a scanning line, a radiographic image that can accurately prevent read-out image data from becoming an abnormal value. An object is to provide an imaging apparatus and 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 arranged so as to intersect with each other; a plurality of radiation detecting elements arranged in a two-dimensional manner in each region partitioned by the plurality of scanning lines and the plurality of signal lines; A detector comprising:
Switch means for discharging the charge accumulated in the radiation detection element to the signal line when an on-voltage is applied;
Scan driving that sequentially applies an on-voltage to each scanning line and sequentially applies an on-voltage to each of the switch means connected to each of the scanning lines during a reading process of reading image data from each of the radiation detection elements. Means,
A readout circuit that converts the electric charge emitted from the radiation detection element to the signal line and reads the image data during the readout process of the image data;
Control means for controlling at least the scanning drive means and the readout circuit to perform readout processing of the image data from the radiation detection elements;
With
When the scanning line has a disconnection, the scanning driving unit applies each scanning line to which the radiation detection element is connected in the reading process of the image data after radiographic imaging performed by irradiation with radiation. The timing of starting the reading process performed by sequentially applying the ON voltage is delayed as compared with the case where the scanning line is not disconnected.

Moreover, the radiographic imaging system of the present invention is
The radiographic imaging device of the present invention, comprising a communication means for transmitting / receiving information to / from an external device;
A radiation generator for irradiating the radiation imaging apparatus with radiation;
With
The scanning drive unit of the radiographic image capturing apparatus reads the image data immediately upon reception of a signal indicating that radiation irradiation has been completed from the radiation generating apparatus when the scanning line is not disconnected. When the scanning line is disconnected, the timing for starting the reading process at the time is delayed from the timing when the scanning line is not disconnected and the image data reading process is started. And

  According to the radiation image capturing apparatus and the radiation image capturing system of the system as in the present invention, when there is a disconnection in the scanning line, each of the image data read processing after the radiation image capturing performed by irradiating the radiation, The timing of starting the image data reading process performed by sequentially applying the ON voltage to the scanning lines is delayed as compared with the case where the scanning lines are not disconnected.

  For this reason, charges flow out from each radiation detection element via the switch means that is connected to the disconnected scanning line and is in a floating state in which no on-voltage or off-voltage is applied, but this charge outflow is attenuated. Then, after the value becomes sufficiently small and can be ignored, the image data reading process can be started.

  As described above, since the reading process of the image data is started when the outflow of charges from the radiation detecting elements 7 connected to the disconnected scanning line is almost stopped, the disconnection is temporarily caused in the scanning line. Even if it occurs, it is possible to accurately prevent the read image data from becoming an abnormal value, and to read the image data accurately.

It is an external appearance perspective view of the radiographic imaging device concerning this embodiment. It is the external appearance perspective view which looked at the radiographic imaging apparatus of FIG. 1 from the other side. It is sectional drawing which follows the XX line in FIG. It is a top view which shows the structure of the board | substrate of a radiographic imaging apparatus. It is an enlarged view which shows the structure of the radiation detection element, TFT, etc. which were formed in the small area | region on the board | substrate of FIG. It is a side view explaining the board | substrate with which COF, a PCB board | substrate, etc. were attached. 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. It is a timing chart showing the ON / OFF timing of the charge reset switch and TFT in the reset processing of each radiation detection element. 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 structure of the radiographic imaging system which concerns on this embodiment. It is an external appearance perspective view showing the state to which the connector of the radiographic imaging device and the connector of the Bucky device were connected. It is a timing chart in the reset process for 1 surface. It is a timing chart showing the timing of transmission of an irradiation start signal, completion of reset processing and transition to a charge accumulation state, transmission of an interlock release signal, and radiation irradiation. 6 is a timing chart showing timings at which an on voltage and an off voltage are applied to each scanning line in a reset process, a charge accumulation state, and an image data read process before radiographic imaging. FIG. 16 is a timing chart for explaining that offset data reading processing is performed by repeating the same processing sequence as the series of processing shown in FIG. 15. FIG. (A) Reading process of disconnected scanning line and offset data, (B) irradiating a lower range, and (C) irradiating a narrow range including the disconnected scanning line. It is a figure to do. It is the graph which plotted the true image data calculated based on the image data obtained by the experiment shown in FIG. 6 is a timing chart showing timings at which an on voltage and an off voltage are applied to each scanning line when the timing at which image data read processing is started is delayed. It is a figure explaining the unconnected terminal of a gate driver. It is a timing chart showing the case where ON voltage is applied sequentially from the non-connected terminal side. It is a timing chart showing the case where the period which applies ON voltage to an unconnected terminal is lengthened. 6 is a timing chart showing a charge reset switch, TFT on / off timing, and the like in leak data read processing; It is a figure explaining that each electric charge which leaked from each radiation detection element via TFT is read as leak data. FIG. 20 is a timing chart for explaining that offset data reading processing is performed by repeating the same processing sequence as the series of processing shown in FIG. 19. FIG. It is a timing chart in the case of performing the reading process of leak data and the reset process of each radiation detection element alternately. It is a block diagram showing an example of the equivalent circuit of the radiographic imaging apparatus provided with the electric current detection means.

  Embodiments of a radiographic image capturing apparatus according to the present invention will be described below with reference to the drawings.

  In the following description, the radiographic imaging device is a so-called indirect radiographic imaging device that includes a scintillator or the like and converts the irradiated radiation into electromagnetic waves of other wavelengths such as visible light to obtain an electrical signal. As will be described, the present invention can also be applied to a direct radiographic imaging apparatus. Although the case where the radiographic image capturing apparatus is portable will be described, the present invention can also be applied to a radiographic image capturing apparatus (that is, a so-called dedicated machine) formed integrally with a support base or the like.

[Radiation imaging equipment]
FIG. 1 is an external perspective view of the radiographic image capturing apparatus according to the present embodiment, and FIG. 2 is an external perspective view of the radiographic image capturing apparatus viewed from the opposite side. FIG. 3 is a sectional view taken along line XX of FIG. As shown in FIGS. 1 to 3, the radiographic image capturing apparatus 1 includes a housing 2 in which a sensor panel SP including a scintillator 3 and a substrate 4 is accommodated.

  As shown in FIG. 1 and FIG. 2, in this embodiment, a hollow rectangular tube-shaped housing body 2A having a radiation incident surface R in the housing 2 is made of a material such as a carbon plate or plastic that transmits radiation. The housing 2 is formed by closing the openings on both sides of the housing body 2A with lid members 2B and 2C. Instead of forming the casing 2 as such a so-called monocoque type, for example, a so-called lunch box type formed of a front plate and a back plate can be used.

  As shown in FIG. 1, the lid member 2 </ b> B on one side of the housing 2 is configured with a power switch 37, a changeover switch 38, a connector 39, an LED that displays a battery state, an operating state of the radiographic imaging apparatus 1, and the like. The indicator 40 and the like are arranged.

  In this embodiment, the connector 39 transmits image data D or the like to the console 58 (see FIG. 11) as described later by connecting a cable 51b or the like as shown in FIG. It functions as a communication means when exchanging information or signals between the radiation image capturing apparatus 1 and the radiation generating apparatus 55. In addition, the installation position of the connector 39 is not limited to the lid member 2 </ b> B, and can be installed at an appropriate position of the radiographic image capturing apparatus 1.

  Further, as shown in FIG. 2, for example, the radiographic image capturing apparatus 1 and the radiation generating apparatus 55 do not exchange information and signals, and the radiographic image capturing apparatus 1 exchanges information and signals only with the console 58. In this case, an antenna device 41 as a communication unit for performing exchange of information, signals, and the like with the console 58 by a wireless method is provided, for example, on the lid member 2C on the opposite side of the housing 2.

  The antenna device 41 can be provided, for example, by being embedded in the lid member 2C. At this time, the installation position of the antenna device 41 is not limited to the lid member 2 </ b> C, and the antenna device 41 can be installed at an arbitrary position of the radiographic image capturing apparatus 1. Further, the number of antenna devices 41 to be installed is not limited to one, and a plurality of antenna devices can be provided.

  As shown in FIG. 3, a base 31 is disposed inside the housing 2 via a lead thin plate (not shown) on the lower side of the substrate 4, and an electronic component 32 is disposed on the base 31. The PCB substrate 33, the buffer member 34, and the like are attached. Further, a glass substrate 35 for protecting the substrate 4 and the radiation incident surface R of the scintillator 3 is disposed. Moreover, in this embodiment, the buffer material 36 for preventing that they collide between the sensor panel SP and the side surface of the housing | casing 2 is provided.

  The scintillator 3 is provided at a position on the substrate 4 that faces a detection unit P described later. In the present embodiment, the scintillator 3 is, for example, a phosphor whose main component is converted into an electromagnetic wave having a wavelength of 300 to 800 nm when receiving radiation, that is, an electromagnetic wave centered on visible light and output. .

  In the present embodiment, the substrate 4 is formed of a glass substrate. As shown in FIG. 4, a plurality of scanning lines 5 and a plurality of signal lines are provided on a surface 4 a of the substrate 4 facing the scintillator 3. 6 are arranged so as to cross each other. 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 substrate 4, radiation detection elements 7 are respectively provided.

  Thus, the entire region r in which a plurality of radiation detection elements 7 arranged in a two-dimensional manner are provided in each small region r partitioned by the scanning line 5 and the signal line 6, that is, shown by a one-dot chain line in FIG. The region is a detection unit P.

  In the present embodiment, a photodiode is used as the radiation detection element 7, but other than this, for example, a phototransistor or the like can also be used. As shown in FIG. 5 which is an enlarged view of FIG. 4, each radiation detection element 7 is connected to a source electrode 8s of a TFT 8 which is a switch means. The drain electrode 8 d of the TFT 8 is connected to the signal line 6.

  When the radiation detection element 7 receives radiation from the radiation incident surface R of the housing 2 of the radiation image capturing apparatus 1 and is irradiated with electromagnetic waves such as visible light converted from the radiation by the scintillator 3, the inside of the radiation detection element 7 becomes electron positive. Generate hole pairs. In this way, the radiation detection element 7 converts the irradiated radiation (electromagnetic wave irradiated from the scintillator 3) into electric charge.

  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. The TFT 8 is turned off when an off voltage is applied to the gate electrode 8g via the connected scanning line 5, and the emission of the charge from the radiation detecting element 7 to the signal line 6 is stopped, and the radiation detecting element The electric charge is accumulated in 7.

  In the present embodiment, as shown in FIG. 5, one bias line 9 is connected to a plurality of radiation detection elements 7 arranged in rows, and as shown in FIG. Each is arranged in parallel to the signal line 6. Further, each bias line 9 is bound to the connection 10 at a position outside the detection portion P of the substrate 4.

  In the present embodiment, as shown in FIG. 4, each scanning line 5, each signal line 6, and connection 10 of the bias line 9 are input / output terminals (also referred to as pads) provided near the edge of the substrate 4. ) 11. As shown in FIG. 6, each input / output terminal 11 has an anisotropic COF (Chip On Film) 12 in which a chip such as a gate IC 15c constituting a gate driver 15b of a scanning drive means 15 described later is incorporated on a film. They are connected via an anisotropic conductive adhesive material 13 such as an anisotropic conductive adhesive film or an anisotropic conductive paste.

  The COF 12 is routed to the back surface 4b side of the substrate 4 and is connected to the PCB substrate 33 described above on the back surface 4b side. In this way, the sensor panel SP of the radiation image capturing apparatus 1 is formed. In FIG. 6, illustration of the electronic component 32 and the like is omitted.

  Here, the circuit configuration of the radiation image capturing apparatus 1 will be described. FIG. 7 is a block diagram showing an equivalent circuit of the radiographic imaging apparatus 1 according to the present embodiment, and FIG. 8 is a block diagram showing an equivalent circuit for one pixel constituting the detection unit P.

  As described above, each radiation detection element 7 of the detection unit P of the substrate 4 has the bias line 9 connected to the second electrode 7b, and each bias line 9 is bound to the connection 10 to the bias power source 14. It is connected. The bias power supply 14 applies a bias voltage to the second electrode 7 b of each radiation detection element 7 via the connection 10 and each bias line 9. The bias power supply 14 is connected to a control means 22 described later, and the control means 22 controls the bias voltage applied to each radiation detection element 7 from the bias power supply 14.

  As shown in FIGS. 7 and 8, in the present embodiment, the bias power supply 14 supplies the second electrode 7 b of the radiation detection element 7 to the first electrode 7 a side of the radiation detection element 7 as a bias voltage via the bias line 9. A voltage equal to or lower than the voltage applied to (i.e., a so-called reverse bias voltage) is applied.

  The scanning drive means 15 is a power supply circuit 15a that supplies an on-voltage and an off-voltage to the gate driver 15b via the wiring 15d, and a voltage applied to each line L1 to Lx of the scanning line 5 between the on-voltage and the off-voltage. A gate driver 15b that switches between the on state and the off state of each TFT 8 is provided. In the present embodiment, the gate driver 15b includes a plurality of gate ICs 15c (see FIG. 6) arranged in parallel.

  It should be noted that the application of the on-voltage from the gate driver 15b of the scanning drive means 15 to each of the lines L1 to Lx in the scanning drive means 15 during the reading process of the image data D from each radiation detection element 7 will be described in detail later. explain.

  As shown in FIGS. 7 and 8, each signal line 6 is connected to each readout circuit 17 formed in the readout IC 16. The readout circuit 17 includes 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 reading IC 16. 7 and 8, the correlated double sampling circuit 19 is represented as CDS. In FIG. 8, the analog multiplexer 21 is omitted.

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 18 a of the amplifier circuit 18, and the reference potential V ₀ is applied to the non-inverting input terminal on the input side of the amplifier circuit 18. . Note that the reference potential V ₀ is set to an appropriate value, and in this embodiment, for example, 0 [V] is applied.

  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. Further, a switch 18e that opens and closes in conjunction with the charge reset switch 18c is provided between the operational amplifier 18a and the correlated double sampling circuit 19, and the switch 18e is turned on / off by the charge reset switch 18c. It is designed to be turned off / on in conjunction with

  In the radiographic imaging device 1, in the reset process of each radiation detection element 7 for removing the charge remaining in each radiation detection element 7, as shown in FIG. 9, the charge reset switch 18c is turned on. When the TFTs 8 are turned on in the state where the switch 18e is turned off (and the switch 18e is turned off), electric charges are discharged from the radiation detecting elements 7 to the signal lines 6 through the TFTs 8 which are turned on, and are amplified. It passes through the charge reset switch 18c of the circuit 18, passes through the operational amplifier 18a from the output terminal side of the operational amplifier 18a, and is grounded from the non-inverting input terminal or flows out to the power supply unit 18d.

  On the other hand, when the image data D is read from each radiation detection element 7, the charge reset switch 18c of the amplifier circuit 18 is turned off (and the switch 18e is turned on) as shown in FIG. In this state, when charges are released from the radiation detecting elements 7 to the signal lines 6 through the TFTs 8 that are turned on, the charges are accumulated in the capacitor 18b of the amplifier circuit 18. In the amplifier circuit 18, a voltage value corresponding to the amount of charge accumulated in the capacitor 18 b is output from the output side of the operational amplifier 18 a, and the charge flowing out from each radiation detection element 7 by the amplifier circuit 18. Is converted into a charge voltage.

  The correlated double sampling circuit (CDS) 19 provided on the output side of the amplifier circuit 18 receives the pulse signal Sp1 (see FIG. 10) from the control means 22 before the electric charge flows out from each radiation detection element 7. Then, the voltage value Vin output from the amplification circuit 18 at that time is held, and the charge flowing out from each radiation detection element 7 as described above is accumulated in the capacitor 18b of the amplification circuit 18 and then from the control means 22. When the pulse signal Sp2 is transmitted, the voltage value Vfi output from the amplifier circuit 18 at that time is held.

  When the correlated double sampling circuit 19 holds the voltage value Vfi with the second pulse signal Sp2, the correlated double sampling circuit 19 calculates the difference Vfi−Vin of the voltage value, and uses the calculated difference Vfi−Vin as downstream image data D of the analog value. Output to the side. Then, the image data D of each radiation detection element 7 output from the correlated double sampling circuit 19 is sequentially transmitted to the A / D converter 20 via the analog multiplexer 21, and is sequentially converted into a digital value by the A / D converter 20. The image data D is converted to the image data D, output to the recording means 23 and sequentially stored.

  When one reading process of the image data D is completed, the charge reset switch 18c of the amplifier circuit 18 is turned on (see FIG. 10), and the charge accumulated in the capacitor 18b is discharged, and the same as above. On the other hand, the discharged electric charge passes through the operational amplifier 18a from the output terminal side of the operational amplifier 18a, goes out from the non-inverting input terminal, is grounded, or flows out to the power supply unit 18d.

  The control means 22 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an input / output interface connected to the bus, an FPGA (Field Programmable Gate Array), or the like (not shown). It is configured. It may be configured by a dedicated control circuit. And the control means 22 controls operation | movement etc. of each member of the radiographic imaging apparatus 1. Further, as shown in FIG. 7 and the like, the control means 22 is connected to a recording means 23 composed of a DRAM (Dynamic RAM) or the like.

  In the present embodiment, the above-described antenna device 41 is connected to the control unit 22, and each member such as the detection unit P, the scanning drive unit 15, the readout circuit 17, the recording unit 23, the bias power source 14, and the like. A battery 24 for supplying electric power is connected. Further, a connection terminal 25 for charging the battery 24 by supplying power to the battery 24 from a charging device (not shown) is attached to the battery 24.

  As described above, the control unit 22 controls the bias power supply 14 to set or vary the bias voltage applied from the bias power supply 14 to each radiation detection element 7. It is designed to control the operation.

  Reset processing of each radiation detection element 7 performed by sequentially applying an ON voltage to each line L1 to Lx of the scanning line 5 from the scanning drive means 15 and reading of image data D from each radiation detection element 7 unique to the present invention. Processing and the like will be described after the configuration of the radiation image capturing system 50 is described.

[Radiation imaging system]
FIG. 11 is a diagram illustrating a configuration of a radiographic image capturing system according to the present embodiment. In the photographing room R1, a bucky device 51 is installed, and the bucky device 51 can be used by loading the radiographic imaging device 1 in its cassette holding part (also referred to as a cassette holder) 51a. It has become. FIG. 11 shows a case where a bucky device 51A for standing position shooting and a bucky device 51B for standing position shooting are installed as the bucky device 51. For example, a bucky device for standing position shooting is shown. Only 51A or only the bucky device 51B for lying position photography may be provided.

  In the present embodiment, as shown in FIG. 12, the connector 39 of the radiographic imaging apparatus 1 and the connector 51c provided at the tip of the cable 51b extending from the bucky apparatus 51 are connected to each other, and the radiographic imaging apparatus 1 is loaded into the bucky device 51. It is also possible to provide a connector 51c in the cassette holding part 51a so that the connector 39 and the connector 51c are automatically connected when the radiation image capturing apparatus 1 is loaded. Composed.

  In the present embodiment, the bucky device 51 supplies power from the bucky device 51 to the radiographic imaging device 1 when the connector 51c and the connector 39 of the radiographic imaging device 1 are connected, which will be described later. Transmission / reception of image data D, signals, and the like to / from the console 58 is performed in a wired manner via the cable 51b of the bucky device 51 and a repeater 54 described later. It is also possible to configure transmission / reception of image data D and signals to / from the console 58 via the antenna device 41 in a wireless manner.

  Further, in the present embodiment, when the radiographic image capturing apparatus 1 is used in the Bucky apparatus 51 in the photographing room R1, it exchanges signals with the radiation generating apparatus 55, which will be described later, and the radiation generating apparatus 55. In this case, the exchange of signals with the radiation generating device 55 is performed via the cable 51b of the Bucky device 51 or a repeater 54 described later.

  In the following, a method for performing radiographic imaging in cooperation with the radiographic imaging apparatus 1 and the radiation generating apparatus 55 by exchanging signals between the radiographic imaging apparatus 1 and the radiation generating apparatus 55 will be described below. It is called a method.

  As shown in FIG. 11, at least one radiation source 52 </ b> A for irradiating the radiation image capturing apparatus 1 loaded in the Bucky apparatus 51 via the subject is provided in the imaging room R <b> 1. In the present embodiment, by moving the position of the radiation source 52A or changing the irradiation direction of the radiation, radiation is applied to both the standing-up imaging device 51A and the standing-up imaging device 51B. Can be done.

  The imaging room R1 is provided with a repeater (also referred to as an access point, a base station, etc.) 54 for relaying communication between each device in the imaging room R1 and each device outside the imaging room R1. ing. In the present embodiment, the repeater 54 is provided with a wireless antenna 53 so that the radiographic image capturing apparatus 1 can transmit and receive image data D, signals, and the like in a wireless manner. In the present embodiment, the above-described Bucky devices 51A and 51B and the repeater 54 are connected by cables or the like.

  The relay 54 is connected to the radiation generator 55 and the console 58, and the relay 54 transmits a signal for LAN communication transmitted to the radiation generator 55 from the radiographic imaging device 1, the console 58, and the like. A converter (not shown) that converts the signal into a signal for the radiation generator 55 and the reverse conversion is incorporated.

  In the present embodiment, the front room (also referred to as the operation room) R2 is provided with an operation console 57 of the radiation generating device 55. The operation console 57 is operated by an operator such as a radiation engineer to generate radiation. An exposure switch 56 is provided for instructing the apparatus 55 to start radiation irradiation. In this embodiment, an operator such as a radiologist operates the exposure switch 56 twice so that radiation is emitted from the radiation source 52.

  Specifically, when the operator performs the first operation on the exposure switch 56, an activation signal is transmitted from the console 57 to the radiation generator 55. The radiation generator 55 When the activation signal is received, the radiation source 52A is activated. When the second operation is performed on the exposure switch 56, an irradiation start signal is transmitted from the console 57 to the radiation generator 55.

  As will be described later, in the present embodiment, this irradiation start signal is also transmitted to the radiographic image capturing apparatus 1 via the repeater 54. As will be described later, when an interlock release signal is transmitted from the radiographic imaging apparatus 1 via the relay 54, the radiation generation apparatus 55 emits radiation from the radiation source 52.

  In addition to this, the radiation generating device 55 moves the radiation source 52 to a predetermined position so that the radiation image capturing device 1 loaded in the designated bucky device 51 can be appropriately irradiated with radiation, or the radiation direction thereof. The radiation source 52 is adjusted so that a diaphragm, a collimator, etc. (not shown) are adjusted so that the radiation is irradiated in a predetermined region of the radiographic image capturing apparatus 1, or an appropriate dose of radiation is irradiated. Various controls such as adjustment of the radiation source 52 are performed on the radiation source 52.

  In addition, the radiation generation device 55 ends the radiation irradiation from the radiation source 52 when a set time has elapsed from the start of the radiation irradiation. When the radiation generating device 55 ends the radiation irradiation from the radiation source 52, at the same time, a signal indicating that the radiation irradiation has ended (hereinafter referred to as an end signal) is transmitted via the relay 54. The image is transmitted to the image capturing apparatus 1.

  As shown in FIG. 11, in the present embodiment, a console 58 constituted by a computer or the like is provided outside the photographing room R1 and the front room R2. The console 58 may be configured to be provided in the front chamber R2 or the like, and the installation location of the console 58 is appropriately determined.

  In the present embodiment, the console 58 is provided with a display unit 58a configured with a CRT (Cathode Ray Tube), an LCD (Liquid Crystal Display), or the like, and also configured with an HDD (Hard Disk Drive) or the like. The storage means 59 is connected or built in.

  When the image data D or the like is transmitted from the radiographic image capturing apparatus 1, the console 58 displays a preview image on the display unit 58 a based on the image data D or the image data transmitted from the radiographic image capturing apparatus 1. A final radiation image is generated based on D, offset data O described later, and the like.

  As described above, the console 58 is normally used for image processing and the like, and is similarly used in the present embodiment. In the present embodiment, the console 58 is further used as a warning device as described later. The case of using will be described. At that time, as will be described later, the console 58 is configured to display a warning image on the display unit 58a. However, the console 58 includes voice generation means such as a speaker (not shown) so that the voice also issues a warning. It is also possible to do.

  Further, instead of using the console 58 as a warning device, or in combination therewith, for example, a warning device including a CRT, an LCD, a speaker, or the like may be provided in the photographing room R1 or the front room R2.

[Regarding normal processing]
Next, processing in a normal case, that is, a case where none of the scanning lines 5 are disconnected will be described.

  In the present embodiment, when radiographic imaging is performed in a cooperative manner, the control unit 22 first performs reset processing of each radiation detection element 7 before radiographic imaging. In the reset process of each radiation detection element 7, for example, as shown in FIG. 13, an on-voltage is applied to each line L <b> 1 to Lx of the scanning line 5 from the gate driver 15 b (see FIG. 7) of the scanning drive unit 15. Then, an ON voltage is applied to the gate electrode 8g of each TFT 8 to turn on the TFT 8, and the electric charge remaining in each radiation detection element 7 is discharged to each signal line 6.

  Then, as shown in FIG. 13, the scanning lines 5 to which the on-voltage is applied are sequentially switched, the on-voltage is sequentially applied to the lines L1 to Lx of the scanning line 5, and the reset process of each radiation detection element 7 is repeated. . In this way, the control means 22 repeats the reset process Rm for one surface, which is performed by sequentially applying the ON voltage from the first line L1 to the last line Lx of the scanning line 5.

  In this case, when the reset process Rm for one surface is repeated a predetermined number of times, the reset process of each radiation detection element 7 is finished, and thereafter, the off voltage is applied to all the lines L1 to Lx of the scanning line 5. However, it is also possible to configure to wait for radiation irradiation in a state where all TFTs 8 are turned off. However, in this embodiment, in order to reduce the charge remaining in each radiation detection element 7, the reset process of each radiation detection element 7 is repeated until immediately before the start of radiation irradiation.

  Then, as shown in FIG. 14, during the reset process Rm for one surface, the exposure switch 56 is operated on the radiation generation device 55 side as described above, and the radiation image capturing device 1 from the radiation generation device 55 is operated. When the irradiation start signal is transmitted, the control means 22 of the radiographic image capturing apparatus 1 sets each radiation at the time when the reset process Rm for one surface performed when the irradiation start signal is transmitted is completed. After the reset process of the detection elements 7 is finished, the off-voltage is applied from the scanning drive means 15 to all the lines L1 to Lx of the scanning lines 5 to turn off all the TFTs 8 so that each radiation detection element 7 is placed inside thereof. The state is shifted to a charge accumulation state where charges are accumulated.

  At the same time, the control means 22 transmits an interlock release signal to the radiation generator 55 when the reset process Rm for one surface is completed as described above. When receiving the interlock release signal from the radiographic image capturing apparatus 1 via the relay 54, the radiation generating apparatus 55 causes the radiation source 52 to emit radiation as described above.

  As described above, the control unit 22 of the radiographic image capturing apparatus 1 transmits an interlock release signal to the radiation generation apparatus 55 to shift to the charge accumulation state, and then ends radiation irradiation from the radiation generation apparatus 55. When the end signal is transmitted, the on-voltage is immediately applied to each of the lines L1 to Lx of the scanning line 5 as shown in FIG. Read processing is performed.

  In addition, the diagonal line in FIG. 15 represents that the radiation was irradiated in the period. In this normal case, the time required for the charge accumulation state is the charge accumulation time τ in which the off-voltage is applied to the lines L1 to Lx of the scanning line 5 to accumulate charges in the radiation detection elements 7. It corresponds to. Further, in FIG. 15 and FIG. 16 described later, the effective accumulation time T is illustrated. The effective accumulation time T will be described later.

  Further, the radiation image capturing apparatus 1 is configured so that the radiation image capturing apparatus 1 itself can measure the dose of radiation applied to the radiation image capturing apparatus 1, and when a predetermined dose of radiation is irradiated, the radiation image capturing apparatus 1 performs the radiation generating apparatus. It is also possible to instruct 55 to end the irradiation of radiation. In this case, the control means 22 performs a process of reading the image data D from each radiation detection element 7 after transmitting a signal for instructing.

  Furthermore, the radiation image capturing apparatus 1 itself does not transmit / receive the end signal or the instruction signal as described above, and the radiation start signal is transmitted from the radiation generating apparatus 55 or the radiation image capturing apparatus 1 receives the radiation. It is also possible to measure the time elapsed from the time when the interlock release signal is transmitted to the generator 55 and to read out the image data D from each radiation detection element 7 when a predetermined time has passed. It is.

  On the other hand, as shown in FIG. 15, during the charge accumulation state, each TFT 8 is turned off, and charges generated in each radiation detection element 7 due to radiation irradiation are accumulated in each radiation detection element 7. Further, inside each radiation detection element 7, so-called dark charges are constantly generated by thermal excitation or the like due to heat of each radiation detection element 7 itself, and the dark charges are also accumulated in each radiation detection element 7.

In the image data D read by the reading process of the image data D, useful data (hereinafter referred to as true image data D ^* ) due to charges generated in each radiation detection element 7 due to radiation irradiation. In addition to the above, data corresponding to an offset due to dark charges, that is, offset data O is also included.

In the subsequent image processing, true image data D ^* is calculated from the image data D and the offset data O by calculation according to the following equation (1), and the final radiation is based on the true image data D ^*. An image is generated.
D ^* = DO (1)

  Therefore, in order to obtain offset data O corresponding to the offset due to the dark charge, the control unit 22 of the radiographic image capturing apparatus 1 performs FIG. 16 before or after the radiographic image capturing or the series of radiographic image capturing. As shown in FIG. 9, the offset data O is read out by repeating the same processing sequence as the series of processing shown in FIG.

  As shown in FIG. 16, when acquiring the offset data O, the radiation image capturing apparatus 1 is not irradiated with radiation in the charge accumulation state, and after performing reset processing of each radiation detection element 7, The radiographic imaging apparatus 1 is left for the same time τ as the charge accumulation time τ in the charge accumulation state shown in FIG.

  As described above, the read processing of the image data D and the read processing of the offset data O are performed in the same processing sequence, and the charge storage time τ in the charge storage state is set to the same time, so that the darkness accumulated in each radiation detection element 7 is stored. Since the amount of charge is equal between the reading process of the image data D and the reading process of the offset data O, the offset data O read by the reading process of the offset data O is the image read by the reading process of the image data D. It can be handled as offset data O included in the data D.

  Further, the reset process of each radiation detection element 7 performed before the offset data O reading process is repeated once or as many times as necessary as shown in FIG. Further, for example, the above-described offset data O reading process is repeated a plurality of times, and a plurality of offset data O obtained by each reading process is averaged for each radiation detection element 7, and the average value is obtained. It is also possible to configure so as to be offset data O.

  In the present embodiment, when the radiographic image capturing apparatus 1 completes the radiographic image capturing and the offset data O reading process, the console transmits necessary information such as the image data D and the offset data O via the relay device 54 at an appropriate timing. 58 is transmitted.

[Processing when there is a disconnection]
The above is the normal processing when no scan line 5 is disconnected. However, as described above, when any scan line 5 is disconnected, the scan driver 15b of the scan driving unit 15 applies the scan line. 5 cannot be turned on. Therefore, each TFT 8 connected to the scanning line 5 cannot block the charge accumulated in the radiation detection element 7 from flowing out from the radiation detection element 7 to the signal line 6, and the radiation detection element 7. The charge generated inside flows out to the signal line 6 through the TFT 8.

  Therefore, when the on-voltage is sequentially applied to the other scanning lines 5 and the image data D is read from each radiation detecting element 7, the electric charge that has flowed out from the radiation detecting elements 7 connected to the disconnected scanning lines 5. Is superimposed on the image data D, and the read image data D has an abnormal value.

  In particular, the image data read out until the electric charge completely flows out from each radiation detection element 7 connected to the disconnected scanning line 5, that is, while the electric charge continues to flow out from each radiation detection element 7. D (image data D read from each radiation detection element 7 connected to the first line L1 of the scanning line 5 and the line L in the vicinity thereof) in the case of the above-described cooperation method becomes an abnormal value. There was a fear of it.

  Here, as shown in FIG. 17A, the present inventors actually cut a part of the COF 12 (see FIG. 6) with a cutter, etc., thereby disconnecting some of the scanning lines 5a (FIG. 17 ( The experiment carried out in (A) is described below.

  First, an on-voltage is sequentially applied to each scanning line 5 including the disconnected scanning line 5a to perform reset processing of each radiation detection element 7, and then charge accumulation is performed without irradiating the detection part P with radiation. After being left for the time τ, as shown in FIG. 17A, an on-voltage is sequentially applied to each scanning line 5 including the disconnected scanning line 5a, and the offset data O is received from each radiation detection element 7 respectively. read out.

  Next, as shown in FIG. 17 (B), the radiation is uniformly applied to the range of the detection unit P below the broken scanning line 5a (see the alternate long and short dash line in the figure) without passing through the subject. Then, an on-voltage is sequentially applied to each scanning line 5 including the scanning line 5a in accordance with the sequence shown in FIG. 15, and image data D (image data D and the like in this case) is temporarily received from each radiation detection element 7. Read image data D1 etc.).

  Further, as shown in FIG. 17C, radiation is uniformly applied to a narrow range (see the two-dot chain line in the drawing) including the disconnected scanning line 5a without passing through the subject, and then FIG. The on-voltage is sequentially applied to each scanning line 5 including the scanning line 5a in accordance with the sequence shown in FIG. 6 to obtain image data D (image data D in this case is referred to as image data D2 etc.) from each radiation detection element 7. read out.

Thus, the offset data O and the image data D1 and D2 are obtained, and the true image data D1 ^* and D2 ^* are calculated according to the above equation (1). That is, true image data D1 ^* and D2 ^* are calculated according to the following equations (2) and (3), respectively.
D1 ^* = D1-O (2)
D2 ^* = D2-O (3)

Then, when the calculated true image data D1 ^* and D2 ^* are plotted according to the line number n of the scanning line 5 (that is, n of the line Ln of the scanning line 5), the true image data D1 ^* is obtained as shown in FIG. Although the values are almost the same in each line Ln of the scanning line 5, the true image data D2 ^* becomes the largest in the first line L1 of the scanning line 5 where the reading process of the image data D2 is started, and then attenuates. Showing a tendency to go.

  In this case, the line number n of the disconnected scanning line 5a is around 650 and is not included in FIG. Accordingly, in each radiation detection element 7 connected to each scanning line 5 indicated by the line number n in FIG. 18, the radiation is transmitted in any of the cases shown in FIGS. Not irradiated.

  The reason why the result shown in FIG. 18 is obtained is considered as follows.

  As shown in FIG. 17B, when radiation is irradiated to a range that does not include the disconnected scanning line 5a, each radiation detection element 7 connected to the disconnected scanning line 5a is caused by radiation irradiation. Thus, no charge is generated, and only the dark charge generated in each radiation detection element 7 flows out through the TFT 8. That is, from each radiation detection element 7, the dark charge that is constantly generated inside the element is constantly flowing out to the signal line 6 through the TFT 8 that is in a floating state.

  Accordingly, when the image data D1 is read out by sequentially applying the ON voltage to each scanning line 5 as shown in FIG. 15, each radiation detecting element 7 connected to the scanning line 5 to which the ON voltage is applied. The sum of the image data read out from 1 and the data corresponding to the dark charge flowing out from each radiation detection element 7 connected to the disconnected scanning line 5a is read out as image data D1.

At that time, in the range of the scanning lines 5 shown in FIG. 18, since the radiation detecting elements 7 connected to the scanning lines 5 are not irradiated with radiation, the images read from the respective radiation detecting elements 7 are read. The data is as small as the offset data O. Further, the dark charge that always flows out from each radiation detection element 7 connected to the disconnected scanning line 5a is not so large. Therefore, the true image data D1 ^* calculated according to the above equation (2) has almost the same value in each line Ln of the scanning line 5, as shown in FIG.

  On the other hand, when radiation is applied to the disconnected scanning line 5a as shown in FIG. 17C, within each radiation detection element 7 connected to the disconnected scanning line 5a, radiation is applied. A large charge is generated. When radiation irradiation ends, a large amount of charge flows out from each radiation detection element 7 via the TFT 8 at first, and then the amount of outflow decreases.

  Then, as shown in FIG. 15, when the on-voltage is sequentially applied to each scanning line 5 and the read processing of the image data D2 is performed, the read-out image data D2 includes the scanning line 5 to which the on-voltage is applied. Image data read out from each connected radiation detection element 7 (in this case, the data is the same value as the offset data O in the range of the scanning line 5 shown in FIG. 18) and the disconnected scanning line 5a. And data corresponding to the charges generated by the irradiation of radiation that flow out from the radiation detecting elements 7 connected to the.

Therefore, the true image data D2 ^* calculated by subtracting the offset data O from the image data D2 becomes a large value when the reading process of the image data D2 is started after radiation irradiation, and then the wire is disconnected. As the amount of charge flowing out from each radiation detection element 7 connected to the scanning line 5a decreases, the true image data D2 ^* also attenuates.

Therefore, as shown in FIG. 18, the true image data D2 ^* becomes the largest in the first line L1 of the scanning line 5 to which the on-voltage is applied when the reading process of the image data D2 is started, and thereafter It is considered that the on-voltage is gradually attenuated as the on-voltage is sequentially applied to each scanning line 5.

  In the experiments shown in FIGS. 17B, 17C and 18, about 10 scanning lines 5 were cut in order to make the above-mentioned tendency easy to see. For this reason, a large number of TFTs 8 are in a floating state, and electric charges flow out from the large number of radiation detection elements 7 via the TFTs 8 in a floating state. In addition, the radiation image capturing apparatus 1 is irradiated with a very strong dose of radiation that saturates (that is, saturates) the charge in each radiation detection element 7 in each range shown in FIGS. 17B and 17C. I went there.

Since the experiment was performed in such a special situation, as shown in FIG. 18, the true image data D2 ^* is not easily attenuated even when the ON voltage is sequentially applied to several hundred scanning lines 5. ing. However, in a situation where one, two, or three scanning lines 5 are disconnected normally, each radiation detection connected to the disconnected scanning line 5a is performed when a normal dose of radiation is irradiated. From the element 7, the charge generated by the radiation irradiation flows out more quickly. Therefore, abnormal value image data D and true image data D ^* are attenuated more quickly.

In FIG. 18, the true image data D1 ^* and D2 ^* are both increased in the area of each scanning line 5 where the line number n is 500 or more. This is because these scanning lines 5 are irradiated with radiation. Since it is close to the range (refer to FIGS. 17B and 17C), the radiation irradiated to each range is diffracted and the part of these scanning lines 5 is slightly irradiated and connected to these scanning lines 5. It is considered that this is based on the fact that a slight amount of electric charge is generated by irradiation of a slight amount of radiation within each of the radiation detecting elements 7. Therefore, the increase in the true image data D1 ^* and D2 ^* in this portion is not caused by the disconnection of the scanning line 5, but is irrelevant.

  As described above, when the scanning line 5 is disconnected, the read image data D may have an abnormal value. However, the phenomenon that the image data D becomes an abnormal value is that the reading process of the image data D is started. It can be seen that it occurs immediately after.

Therefore, in the present embodiment, when the scanning line 5 is broken in this way, as shown in FIG. 19, the scanning drive unit 15 performs the scanning line 5 in the reading process of the image data D performed after radiation irradiation. The timing for starting the reading process performed by sequentially applying the ON voltage to each of the lines L1 to Lx is delayed as compared with the case where the scanning line 5 shown in FIG. 15 is not disconnected. Note that the effective accumulation time T ^* is shown in FIG. 19, but the effective accumulation time T ^* will be described later.

  In this way, by delaying the timing of starting the reading process of the image data D, the charge is discharged from the radiation detecting elements 7 connected to the disconnected scanning lines 5a through the TFTs 8 in a floating state. Spill. Then, after the amount of electric charge flowing out from each radiation detection element 7 becomes sufficiently small, an on-voltage is sequentially applied to each of the lines L1 to Lx of the scanning line 5 to start reading processing of the image data D. It has become.

  Therefore, with this configuration, each radiation detection connected to the disconnected scanning line 5a is superimposed on the image data D that is read out by sequentially applying the ON voltage to each of the lines L1 to Lx of the scanning line 5. Since the data resulting from the electric charge flowing out from the element 7 becomes sufficiently small and can be ignored, even if the scanning line 5 is disconnected, the read image data D is accurately set to an abnormal value. It becomes possible to prevent.

  Hereinafter, a specific method for delaying the timing for starting the reading process of the image data D when the scanning line 5 is disconnected from that when the scanning line 5 is not disconnected will be described. In addition, the operation of the radiographic image capturing apparatus 1 and the radiographic image capturing system 50 according to the present embodiment will be described.

The determination as to whether or not there is a disconnection in the scanning line 5 can also be configured so that the radiographic imaging device 1 itself, that is, the control means 22 of the radiographic imaging device 1 determines, as will be described later (for example, It is also possible to configure such that an operator such as a radiographer sees and determines a radiographic image generated based on the true image data D ^* .

  As described above, when there is a break in the scanning line 5, the image data D read immediately after the reading process of the image data D is started, that is, in the present embodiment, each of the lines in the vicinity of the line L1 of the scanning line 5. Since the value of the image data D read from each radiation detection element 7 connected to the scanning line 5 becomes large, a portion corresponding to the vicinity of the line L1 of the scanning line 5 in the radiation image becomes slightly dark (blackish). Become.). Therefore, an operator or the like can make a visual determination.

  In addition, as in the present embodiment, the radiation image capturing apparatus 1 and the radiation generating apparatus 55 exchange signals to perform radiation image capturing. When radiation irradiation ends, the radiation generating apparatus 55 sends radiation to the radiation image capturing apparatus. In the case where a signal indicating that radiation irradiation has been completed, that is, an end signal is transmitted to the image capturing apparatus 1, the scanning drive unit 15 of the radiation image capturing apparatus 1 is disconnected from the scanning line 5. If there is not, the reading process of the image data D is started immediately when the end signal is received from the radiation generator 55.

  As described above, the radiation image capturing apparatus 1 itself measures the radiation dose irradiated to the radiation image capturing apparatus 1, and the radiation generating apparatus 55 is irradiated with the radiation when a predetermined dose of radiation is irradiated. In the case where it is configured to instruct to end, the reading process of the image data D from each radiation detection element 7 is immediately started at the time when the signal for instructing is transmitted. Further, in the case where the reading process is started when a predetermined time elapses from the time when the interlock release signal is transmitted from the radiographic imaging device 1 to the radiation generation device 55, the above-described predetermined processing is performed. When the time elapses, reading processing of the image data D from each radiation detection element 7 is started.

  On the other hand, in the radiographic image capturing apparatus 1 and the radiographic image capturing system 50 according to the present embodiment, when the scanning line 5 is disconnected, the lines L1 to Lx of the scanning line 5 to which the radiation detecting element 7 is connected are turned on. The timing of starting the reading process performed by sequentially applying voltages is configured to start the reading process of the image data D by delaying the timing of starting the reading process from the case where the scanning line 5 is not disconnected. Yes.

  As a method of delaying the timing for starting the reading process of the image data D when the scanning line 5 is disconnected from the case where the scanning line 5 is not disconnected, the following methods can be employed.

[Method 1] For example, when the scanning line 5 is disconnected, the control means 22 of the radiation imaging apparatus 1 that has received the charge accumulation time τ, that is, the irradiation start signal from the radiation generator 55, When the reset process Rm for one surface is completed, an interlock release signal is transmitted to the radiation generation device 55, and the gate driver 15b of the scanning driving unit 15 turns off all the lines L1 to Lx of the scanning line 5. The time τ required for the charge accumulation state when a voltage is applied to shift to the charge accumulation state is varied so as to be extended by a predetermined time from the charge accumulation time τ set when the scanning line 5 is not disconnected. .

  When the charge accumulation time τ is extended by a predetermined time, it is possible to extend the charge accumulation time τ uniformly for a predetermined time. In this case, the uniform predetermined time to be extended is, for example, the maximum dose of the normal dose of radiation irradiated to the radiographic imaging apparatus 1 in a state in which one scanning line 5 is disconnected. When irradiated, the charge flowing out from each radiation detecting element 7 connected to the disconnected scanning line 5a is attenuated, and the data resulting from the flowing out charge becomes sufficiently small and can be ignored. Is set to the time until.

  Further, a predetermined time for extending the charge accumulation time τ can be set based on leak data dleak described later, which will be described later.

  If the charge accumulation time τ is extended by a predetermined time as described above, each radiation detection element 7 connected to the disconnected scanning line 5a is brought into a floating state while the predetermined time elapses. Since the reading process of the image data D is started when the outflow of the electric charge flowing out through the TFT 8 is almost stopped, even if the scanning line 5 is disconnected, the read image is read out. It is possible to accurately prevent the data D from becoming an abnormal value.

[Method 2] Also, depending on the radiographic imaging device 1, for example, as shown in FIG. 20, the scanning line 5 is connected to one (or a plurality) of each gate IC 15c constituting the gate driver 15b of the scanning driving means 15. There may be a so-called unconnected terminal p that is not connected.

  Then, when an on-voltage is sequentially applied to each of the lines L1 to Lx of the scanning line 5 in the reading process of the image data D, the resetting process of each radiation detection element 7, etc., for example, as shown in FIG. Before the terminals to which the lines L1 to Lx are connected, the ON voltage is sequentially applied from the non-connected terminal p side, and then the ON voltages are applied to the lines Lx to L1 of the scanning line 5. It may be configured to apply sequentially.

  In the case of such a configuration, the actual image data D read processing, reset processing of each radiation detection element 7 and the like are performed at the time when the ON voltage is sequentially applied to the terminals to which the respective scanning lines 5 are connected. In practice, while the on-voltage is applied to the non-connected terminal p, the reading process of the image data D, the reset process of each radiation detection element 7 and the like are not actually performed.

[Method 2-1] When the above method 1 is applied in such a configuration, when the scanning line 5 is disconnected, the timing for starting application of the on-voltage to the non-connected terminal p is determined. By controlling so as to delay, the time τ required for the charge accumulation state can be varied so as to be extended by a predetermined time from the charge accumulation time τ set when the scanning line 5 is not disconnected. Is possible.

  Alternatively, as in the case where the scanning line 5 is not disconnected, the application of the on-voltage to the non-connected terminal p is started when the charge accumulation time τ set when the scanning line 5 is not disconnected elapses. However, after the application of the on-voltage to the non-connected terminal p is completed, the radiation detection element 7 is connected at a stage where the application of the on-voltage shifts to the terminal to which each radiation detection element 7 is connected. The time τ required for the charge accumulation state is controlled by setting a predetermined time until the application of the on-voltage to the terminal is started, and the charge accumulation set when the scanning line 5 is not disconnected. It is also possible to make it variable so as to be extended from the time τ by a predetermined time.

  If comprised in this way, it will become possible to acquire the effect similar to the case of said method 1. FIG.

[Method 2-2] Further, when configured as described above, when the scanning line 5 is disconnected, for example, as shown in FIG. When the scanning line 5 is disconnected by making it variable so as to be longer than the period in which the on-voltage is applied to the terminal to which each scanning line 5 is connected, the timing for starting the reading process of the image data D is The scanning line 5 can be delayed as compared with the case where there is no disconnection.

  In this case, too, an on-voltage having a long period is sequentially applied to the non-connected terminal p, and the scan line 5 is connected to the disconnected scan line 5a within a longer time than when the scan line 5 is not disconnected. The outflow of electric charge flowing out from each radiation detection element 7 through the TFT 8 which is in a floating state is almost reduced. At that time, since the reading process of the image data D is started, even if the scanning line 5 is disconnected, the read image data D can be accurately prevented from having an abnormal value. It becomes possible to do.

  In this case, when the on-voltage is applied to the terminal to which each scanning line 5 is connected, that is, the period during which the on-voltage is applied in the actual image data D reading process, the scanning line 5 is disconnected. The period is the same for both cases. Therefore, when the scanning line 5 is disconnected, as shown in FIG. 22, when the ON voltage is sequentially applied to the non-connected terminals p, each scanning line 5 is connected with a long period. When the on-voltage is sequentially applied to the terminals, the on-voltage is sequentially applied to each terminal of the gate driver 15b with a shorter cycle.

  In addition, as to how long the cycle of applying the on-voltage is variable, it is also possible to configure the length to be uniformly increased for a preset time, as in the case of the above-described method 1. Further, as described below, it is also possible to configure to set based on the leak data dleak.

[Method 3] Whether or not the scanning line 5 is disconnected can be determined by checking whether or not the value of the read image data D is abnormally large as described above. If it is determined that the image data D is abnormal, the image data D cannot be used to generate a radiation image. Therefore, it is more preferable if the above determination can be performed by a method other than reading out abnormal value image data D.

  Therefore, instead of determining whether or not the scanning line 5 is disconnected based on the read image data D, for example, it corresponds to the charge leaked from each radiation detection element 7 to the signal line 6 via each TFT 8. The leak data dleak, which is data to be read, is read out, and the control means 22 can determine whether or not the scanning line 5 is disconnected based on the value of the leak data dleak.

  In the reading process of the leak data dleak, as shown in FIG. 23, each reading circuit 17 is operated in a state where an off voltage is applied to all the lines L1 to Lx of the scanning line 5. That is, as in the case of the image data D read processing, the charge reset switch 18c (see FIG. 8) of the amplifier circuit 18 of the read circuit 17 is turned off and the charge is stored in the capacitor 18b. The means 22 transmits the pulse signals Sp1 and Sp2 to the correlated double sampling circuit 19 to perform the holding operation, but the on / off operation of each TFT 8 is not performed during that time.

  When each readout circuit 17 is operated in this way, as shown in FIG. 24, each charge q leaked from each radiation detection element 7 through each TFT 8 turned off is accumulated in the capacitor 18b of the amplifier circuit 18. Is done. Therefore, a voltage value corresponding to the accumulated charge, that is, a total value of the charge q leaked from each radiation detection element 7 is output from the amplifier circuit 18, and the correlation double sampling circuit 19, not shown in FIG. The voltage value is held and the leak data dleak is read out.

  With this configuration, when the scanning line 5 is disconnected, the TFT 8 connected to the disconnected scanning line 5a is in a floating state as described above, and each radiation detection element 7 is connected via the TFT 8. The amount of charge q flowing out from the signal line 6 to the signal line 6 increases. For this reason, the value of the leaked data dleak to be read increases. On the other hand, when the scanning line 5 is not disconnected, such a large charge q does not flow out, so the value of the leaked data dleak to be read remains a normal small value.

[Method 3-1] Using this, for example, when the charge accumulation time τ when the scanning line 5 is not disconnected as shown in FIG. 15 has elapsed, an off voltage is applied to each scanning line 5. When the reading process of the leak data dleak is performed once or several times and the value of the read leak data dleak is larger than, for example, a preset threshold value, the charge accumulation time τ (method 1) or period ( It can be configured to determine whether or not to change the charge accumulation time τ and the cycle in accordance with the read leak data dleak, such as making the method 2) variable.

  It is possible to configure such that the reading process of the leak data dleak once or several times is always performed, and it is also possible to perform only when the disconnection of the scanning line 5 is suspected.

  If comprised in this way, after the control means 22 will determine correctly whether the scanning line 5 has a disconnection based on the value of the read leak data dleak, it will instruct | indicate to the scanning drive means 15, and will instruct | indicate image data. It is possible to determine whether or not to delay the timing for starting the D reading process.

  When the scanning line 5 is disconnected, the reading process of the image data D is started when the outflow of charges flowing out from the radiation detecting elements 7 connected to the disconnected scanning line 5a is almost stopped. Therefore, it is possible to accurately prevent the read image data D from having an abnormal value. In addition, when the scanning line 5 is not disconnected, the reading process of the image data D is accurately performed without delaying the timing, so that the reading process of the image data D can be performed efficiently.

  In this case, the value of the read leak data dleak is equal to or greater than the above threshold value, but if the degree of exceeding the threshold value is small, the degree to which the charge accumulation time τ and the period are changed long is reduced to greatly exceed the threshold value. In such a case, the charge accumulation time τ and the degree to which the period is made long can be set by increasing the charge accumulation time τ and the degree by which the period is made variable, depending on the value of the read leak data dleak. It is also possible to make it variable in steps or continuously.

[Method 3-2] Further, when the charge accumulation time τ (see FIG. 15) when the scanning line 5 is not disconnected has elapsed, the readout process of the leak data dleak is repeatedly performed, and the read leak data By starting the reading process of the image data D when the value of bleak decreases to a value equal to or less than a predetermined threshold value, the scanning line 5 is not disconnected at the timing of starting the reading process of the image data D. It is also possible to configure so as to be delayed from the case.

  With this configuration, when the value of the read leak data dleak is large (in this case, this corresponds to the case where the scanning line 5 is disconnected), the value of the read leak data dleak becomes sufficiently small, Since the reading process of the image data D is started when the outflow of the electric charge flowing out from each radiation detection element 7 connected to the disconnected scanning line 5a is almost stopped, the read image data D is abnormal. It is possible to accurately prevent a negative value.

  Further, when the value of the read leak data dleak is small (in this case, this corresponds to the case where the scanning line 5 is not disconnected), the reading process of the image data D is accurately performed without delaying the timing. Image data D can be read out efficiently.

  The control means 22 of the radiographic image capturing apparatus 1 uses each of the methods shown in the above methods 1 to 3, and when the scan line 5 is disconnected, as shown in FIG. In the reading process of the image data D performed after the irradiation of radiation, the timing for starting the reading process performed by sequentially applying the ON voltage to each line L1 to Lx of each scanning line 5 is disconnected in the scanning line 5 shown in FIG. The reading process of the image data D is performed later than the case where there is no image data.

  Note that, as described in the above method 3, when the leak data dleak is read instead of immediately after the charge accumulation state, the image data D is read out, based on the value of the read leak data dleak. Thus, it is possible to determine whether or not any of the scanning lines 5 of the radiation image capturing apparatus 1 is disconnected.

  Therefore, for example, when the value of the read leak data dleak is larger than a predetermined value set in advance (for example, the threshold described in the method 3-1), a signal is sent from the radiographic imaging device 1 to the warning device such as the console 58. It is configured to transmit, and a warning device indicates that an abnormality (disconnection) has occurred in the radiographic imaging device 1 by image display or sound, for example, “Please contact the service center”. It can be configured to issue a warning.

  If the disconnection occurs in the scanning line 5, it is possible to read the image data D accurately by adopting the above-described method. However, the disconnection causes the gate IC 15c of the scanning drive means 15 to In addition, a load is applied to the reading IC 16 provided with the reading circuit 17 or the like, which may cause a failure or the like in each functional unit of the radiographic imaging apparatus 1, repair the disconnection, This is because the SP (see FIG. 3) may need to be replaced.

On the other hand, as described above, in the image data D read by the reading process of the image data D, the true image data D ^* caused by the charges generated in each radiation detection element 7 due to radiation irradiation and the dark charges In this case as well, the offset data O corresponding to this offset is read out before and after radiographic imaging.

  Then, when the reading process of the image data D is performed after the timing at which the reading process of the image data D is started in accordance with the above-described methods 1 to 3 and the like when the scanning line 5 is not disconnected (see FIG. 15). As shown in FIG. 19, as a result, the charge accumulation time τ becomes longer.

Therefore, the time during which the TFT 8 is turned off and the dark charge is accumulated until the image data D is read (hereinafter referred to as effective accumulation time) is the effective shown in FIG. As can be seen by comparing the accumulation time T with the effective accumulation time T ^* shown in FIG. 19 in the case where the scanning line 5 is broken, if the timing for starting the reading process of the image data D is delayed, the dark charge is reduced. The accumulated effective accumulation time T becomes T ^* and becomes longer.

Therefore, for example, as shown in FIG. 19, the effective accumulation time T is increased in accordance with the processing sequence shown in FIG. 16 even though the effective accumulation time T is increased to T ^* because the start of the reading process of the image data D is delayed. If the offset data O is read while T is still T, the offset included in the image data D and the offset data O read in the offset data O reading process have different values, and the above equation (1) Even if the offset data O is subtracted from the image data D according to the above, the calculated true image data D ^* does not become an appropriate value.

  Further, in the study by the present inventors, the offset data O caused by dark charges does not always increase in proportion to the above effective accumulation time T. In particular, in the region where the effective accumulation time T is short, the offset data O is effective. It has been found that it varies nonlinearly with the accumulation time T.

  Therefore, in this embodiment, when the timing for starting the reading process of the image data D is delayed according to the above-described methods 1 to 3 and the like, in the subsequent reading process of the offset data O as shown in FIG. Image data D for applying an ON voltage or an OFF voltage from the scanning drive unit 15 to each of the lines L1 to Lx of the scanning line 5 (including an unconnected terminal p when an ON voltage is applied to the unconnected terminal p). The processing sequence is repeated until the reading process, and the offset data O is read.

  That is, it is the same when the read processing of the leak data dleak is repeatedly performed at the same charge storage time τ and cycle as the charge storage time τ and cycle extended as described above, or at the time of reading processing of the image data D. The read processing of the offset data O is performed after the read processing of the leak data dleak is performed the number of times.

With this configuration, the effective accumulation time T ^* in the reading process of the image data D and the effective accumulation time T ^* (see FIG. 25) in the reading process of the offset data O become the same time and are included in the image data D. Since the offset data O and the offset data O read by the reading process of the offset data O have the same value, the true image data can be obtained by subtracting the offset data O from the image data D according to the above equation (1). D ^* can be accurately calculated.

In addition to this, for example, the offset data O to be read with the extended effective accumulation time T ^* is changed from the processing sequence shown in FIG. 16, that is, the offset data O read without extending the effective accumulation time T. A relational expression to be estimated is obtained in advance by experiments or the like, and the offset data O is read out by the processing sequence shown in FIG. 16 to read the offset data O, and the value should be read from the value at the effective accumulation time T ^*. The offset data O can be estimated.

  As described above, according to the radiographic image capturing apparatus 1 and the radiographic image capturing system 50 according to the present embodiment, image data after radiographic imaging performed by irradiation with radiation when the scanning line 5 is disconnected. In the reading process of D, the timing for starting the reading process of the image data D performed by sequentially applying the ON voltage to each of the lines L1 to Lx of the scanning line 5 is delayed as compared with the case where the scanning line 5 is not disconnected.

  Therefore, charges flow out from each radiation detection element 7 through the TFT 8 which is connected to the disconnected scanning line 5a and is in a floating state in which no on-voltage and no off-voltage are applied. Is attenuated to a sufficiently small value to be negligible, and the reading process of the image data D can be started.

  In this way, the reading process of the image data D is started when the outflow of charges from the radiation detecting elements 7 connected to the disconnected scanning line 5a is almost stopped. Even if a disconnection occurs, it is possible to accurately prevent the read image data D from becoming an abnormal value and to read the image data D accurately.

  Therefore, even if the scanning line 5 is disconnected, the image data D can be obtained with high reliability. For example, a radiological image generated based on such image data D can be diagnosed in medical care. Even in the case of use for the purpose, it is possible to generate a highly reliable radiation image, and to maintain and improve the reliability of diagnosis.

  In the above-described embodiment, a case has been described in which the radiation image capturing apparatus 1 and the radiation generation apparatus 55 exchange signals and the like, and exchange methods such as an irradiation start signal, an interlock release signal, and an end signal. However, the present invention can also be applied to a so-called non-cooperative system in which the above-described signals are not exchanged between the radiographic image capturing apparatus 1 and the radiation generating apparatus 55.

  In the case of such a non-cooperative system, the radiographic imaging device 1 must detect itself that the radiation has been emitted from the radiation generation device 55 without obtaining information from the radiation generation device 55 side.

  In this way, as a method for the radiation image capturing apparatus 1 to detect radiation irradiation by itself, for example, reset processing of each radiation detection element 7 before capturing a radiation image as in the above embodiment (see FIG. 13 and the like). For example, the reading process of the image data d (denoted as image data d in the sense of being distinguished from the image data D as the main image) is repeatedly performed.

  With this configuration, before the radiation image capturing apparatus 1 is irradiated with radiation, the image data d read from each radiation detection element 7 is mainly data resulting from the above-described dark charge, and is small. Although it is only a value, when radiation is applied to the radiation image capturing apparatus 1, data resulting from charges generated in each radiation detection element 7 due to radiation irradiation is read out as image data d. Therefore, the value of the image data d increases rapidly.

  Therefore, for example, a threshold value can be set in advance, and it can be detected that radiation irradiation has started when the read image data d exceeds the threshold value. In this case, when it is detected that the irradiation of radiation is started, the reading process of the image data d is stopped, and the off voltage is applied to each of the lines L1 to Lx of the scanning line 5 from the scanning driving unit 15 to enter the charge accumulation state. Transition.

  As described above, since the reading process of the image data d is stopped, it becomes impossible to monitor the value of the image data d and detect the end of radiation irradiation to the radiation image capturing apparatus 1. Therefore, for example, it is possible to configure so that the read processing of the image data D as the main image is performed when a predetermined time has elapsed since the read processing of the image data d was stopped.

  Further, when the reading process of the image data d is stopped and the off voltage is applied to each of the lines L1 to Lx of the scanning line 5, the reading process of the leak data dleak described above is started, and the reading process of the leak data dleak is repeated. It can also be configured to do so.

  In this case, since the radiation image capturing apparatus 1 has already been irradiated with radiation when the leak data dleak readout process is started, the amount of charge leaking from each radiation detection element 7 via each TFT 8 increases. As a result, the value of the leak data dleak is increased. Then, when radiation irradiation to the radiographic imaging device 1 is completed, the amount of charge leaking from each radiation detection element 7 via each TFT 8 is reduced.

  Therefore, it can be configured that, when the value of the leak data dleak becomes smaller than, for example, a threshold value or less, it is determined that the radiation irradiation to the radiation image capturing apparatus 1 has been completed. In this way, the radiation imaging apparatus 1 itself can detect the end of radiation irradiation.

  Further, as described above, instead of the configuration in which the reading process of the image data d is performed before the radiographic image capturing, the reading process of the leak data dleak may be repeatedly performed before the radiographic image capturing. .

  In this case, as described above, the leak data dleak is read out by applying an off voltage to the lines L1 to Lx of the scanning line 5 and turning off the TFTs 8 (see FIG. 23). Therefore, if only the reading process of the leak data dleak is repeated, dark charges are accumulated in each radiation detection element 7. Therefore, in this case, for example, as shown in FIG. 26, the readout process of the leak data dleak and the reset process of each radiation detection element 7 are alternately performed.

  When configured in this way, as described above, when the radiation imaging apparatus 1 is irradiated with radiation, the amount of charge leaking from each radiation detection element 7 via each TFT 8 increases, and the value of the leakage data dleak is increased. When the radiation exposure to the radiation image capturing apparatus 1 is completed, the amount of charge leaking from each radiation detection element 7 via each TFT 8 is reduced and the value of the leakage data dleak is reduced. By monitoring the value of the leak data dleak by setting or the like, it is possible to detect the start and end of radiation irradiation by the radiation image capturing apparatus 1 itself.

  On the other hand, when the radiation image capturing apparatus 1 is irradiated with radiation, as described above, charges are generated by irradiation of the radiation within each radiation detection element 7, so that the second radiation detection element 7 to which a bias voltage is applied is applied. The potential of the first electrode 7a with respect to the electrode 7b (see FIG. 7 and the like) changes. Therefore, the amount of current flowing through the bias line 9 connected to the second electrode 7b and the connection 10 increases.

  As described above, when the radiation image capturing apparatus 1 is irradiated with radiation, the bias line 9, the connection line 10, the scanning line 5, the power supply circuit 15 a of the scanning drive unit 15 and the gate driver provided in the radiation image capturing apparatus 1. The value of the current flowing in each wiring such as the wiring 15d connecting to 15b increases. Further, when radiation irradiation to the radiographic image capturing apparatus 1 is completed, the value of the current flowing through the wirings is reduced to the original value.

  Therefore, by utilizing this decrease, as shown in FIG. 27, for example, the current detection means 26 is provided at a position where the connection 10 of the bias line 9 is connected to the bias power supply 14. The output current value is configured to be monitored. Then, for example, by setting a threshold value for the current value, it is determined that radiation irradiation has started when the current value exceeds the threshold value, and when the current value becomes less than the threshold value, radiation irradiation is performed. Can be configured to be determined to have ended.

  Then, the radiation imaging apparatus 1 itself detects the start and end of radiation irradiation as described above, and turns off each line L1 to Lx of the scanning line 5 from the scanning drive unit 15 when radiation irradiation is started. When the image data D is read out after the voltage is applied and transferred to the charge accumulation state, if the scanning line 5 is disconnected in the same manner as in the above embodiment, the read processing of the image data D is performed. The present invention is also applied to the case of a non-cooperative system in which the radiographic imaging device 1 and the radiation generation device 55 do not exchange signals or the like by delaying the timing at which the scanning line 5 is not disconnected. It becomes possible to apply.

  Even in the case of the non-cooperation method, it is possible to exhibit the same excellent effect as in the case of the above-described embodiment. Even if the scanning line 5 is disconnected, the read image data D is It is possible to accurately read the image data D by accurately preventing an abnormal value.

DESCRIPTION OF SYMBOLS 1 Radiographic imaging device 5 Scanning line 6 Signal line 7 Radiation detection element 8 TFT (switch means)
15 Scanning drive means 15b Gate driver 17 Reading circuit 22 Control means 39 Connector (communication means)
41 Antenna device (communication means)
50 Radiation Imaging System 55 Radiation Generator 58 Console (Warning Device)
D image data dleak leak data O offset data P detection unit p unconnected terminal q charge r region τ charge accumulation time

Claims (8)

A plurality of scanning lines and a plurality of signal lines arranged so as to intersect with each other; a plurality of radiation detecting elements arranged in a two-dimensional manner in each region partitioned by the plurality of scanning lines and the plurality of signal lines; A detector comprising:
Switch means for discharging the charge accumulated in the radiation detection element to the signal line when an on-voltage is applied;
Scan driving that sequentially applies an on-voltage to each scanning line and sequentially applies an on-voltage to each of the switch means connected to each of the scanning lines during a reading process of reading image data from each of the radiation detection elements. Means,
A readout circuit that converts the electric charge emitted from the radiation detection element to the signal line and reads the image data during the readout process of the image data;
Control means for controlling at least the scanning drive means and the readout circuit to perform readout processing of the image data from the radiation detection elements;
With
When the scanning line has a disconnection, the scanning driving unit applies each scanning line to which the radiation detection element is connected in the reading process of the image data after radiographic imaging performed by irradiation with radiation. The radiographic imaging apparatus characterized by delaying the timing at which the reading process performed by sequentially applying an on-voltage is delayed as compared with the case where the scanning line is not disconnected.   The scanning drive means precedes the terminal to which the scanning line is connected when the gate driver constituting the scanning driving means has a non-connected terminal that is not connected to any of the scanning lines. The on-voltage is sequentially applied from the non-connected terminal side to read the image data, and the cycle of applying the on-voltage to the non-connected terminal is turned on to the terminal to which the scanning line is connected. The radiographic image capturing apparatus according to claim 1, wherein the timing is delayed as compared with a case where the scanning line is not disconnected by varying the period so as to be longer than a period in which the voltage is applied.   The scan driving means applies a charge accumulation time in which charges are accumulated in the radiation detection elements by applying an off voltage to the scan lines before the image data reading process after radiographic imaging. 2. The timing is delayed from the case where there is no disconnection in the scanning line by varying the length so that the case where there is a disconnection in the scanning line becomes longer than the case where there is no disconnection in the scanning line. The radiographic imaging apparatus described in 1.   The control means operates the read circuit in a state in which an off voltage is applied to each scanning line to perform the read operation before the image data read processing after radiographic imaging, and the switch means Whether or not to change the period or the charge accumulation time according to the value of the read leak data, by performing leak data read processing for reading leak data corresponding to the charge leaked from each radiation detection element The radiographic image capturing apparatus according to claim 2, wherein the radiographic image capturing apparatus according to claim 2 is determined.   The control means operates the readout circuit in a state in which an off voltage is applied to each scanning line and repeats the readout operation before the readout processing of the image data after radiographic imaging, and the switch means The leak data read process for reading leak data corresponding to the charges leaking from each radiation detection element is repeatedly performed, and when the read leak data value falls below a threshold value, the image data read process is performed. 2. The radiographic imaging apparatus according to claim 1, wherein the timing of starting the readout process is delayed by initiating the scanning, compared to a case where the scanning line is not disconnected.   The scan driving means may be configured to change the period or the charge accumulation time in the image data read process in the offset data read process performed after the image data read process after the radiographic imaging. When the leak data read process is repeated during the image data read process, the leak data read process is performed the same number of times as the same period or time as the charge accumulation time. The radiographic image capturing apparatus according to claim 2, wherein the offset data is read out after performing the operation. The radiographic imaging apparatus according to any one of claims 1 to 5, further comprising a communication unit that transmits and receives information to and from an external device.
A radiation generator for irradiating the radiation imaging apparatus with radiation;
With
The scanning drive unit of the radiographic imaging device may delay the timing of starting the reading process at the time point when the scanning line is disconnected from the time when the scanning line is not disconnected. A radiographic imaging system characterized by starting a readout process. The radiographic imaging device according to claim 4 or 5, comprising a communication means for transmitting and receiving information to and from an external device;
A radiation generator for irradiating the radiation imaging apparatus with radiation;
A warning device that issues a warning by at least one of image and sound;
With
The control means of the radiographic imaging device transmits a signal to the warning device when the value of the read leak data is larger than a predetermined value set in advance,
When the warning device receives the signal from the radiographic imaging device, the warning device issues a warning that an abnormality has occurred in the radiographic imaging device by at least one of an image and a sound.

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