JP6569337B2 - Radiographic imaging system and radiographic imaging device - Google Patents

Description

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

  2. Description of the Related Art In recent years, there has been a radiographic imaging device (Flat Panel Detector) that arranges radiation detection elements in a two-dimensional form and reads, as image data, charges generated in the radiation detection elements in response to radiation irradiated from the radiation irradiation device and transmitted through the subject. It has been developed in various ways and is used for radiographic imaging in facilities such as hospitals. In recent years, a portable radiographic image capturing apparatus in which a sensor panel on which a radiation detection element or the like is formed is housed in a casing and can be carried has been developed and put into practical use.

  For example, in the case of a portable radiographic image capturing apparatus, the radiographic image capturing apparatus is dropped when the radiographic image capturing apparatus is being carried, and the radiographic image capturing apparatus hits the floor surface or the like. May be broken. Also, in a conventional radiographic imaging apparatus of a so-called dedicated machine type (also referred to as an installation type, a fixed type, etc.) formed integrally with a support base or the like, for example, due to aging degradation, etc. There may be a case where the wiring is disconnected due to peeling of the mounting portion.

  In this way, if radiography is performed by irradiating the radiographic imaging device without noticing that a disconnection has occurred in the radiographic imaging device, a radiographic image cannot be obtained appropriately. For example, another radiographic imaging device is used. Although it is necessary to perform re-imaging by use, etc., it is necessary to irradiate the patient as a subject again with radiation, which causes a problem that the patient's exposure dose increases.

  Therefore, in Patent Document 1, for example, when it is detected that an impact has been applied to the radiographic imaging apparatus by dropping a portable radiographic imaging apparatus, each radiation detection is performed without irradiating the radiographic imaging apparatus. There are described inventions such as a radiographic imaging apparatus and a radiographic imaging system that analyze an image read from an element, that is, an offset image, and diagnose whether the radiographic imaging apparatus is usable.

JP 2011-67334 A

  However, in the invention described in Patent Document 1, it is determined whether or not the pixel value (that is, offset data) of the offset image read from each radiation detection element of the radiographic imaging device is an abnormal value. It is determined whether or not each radiation detection element (ie, each pixel) is out of order. For example, as described later, the substrate is cracked due to the impact of dropping, or the wiring When the wiring is disconnected due to peeling of the part attached to the substrate, etc., even if each radiation detection element is normal, the normal data can be read from all the radiation detection elements connected to the wiring after all. It may disappear.

  In addition, as will be described later, when determining whether or not a wiring of a radiographic imaging device is disconnected, the dispersion and standard deviation of offset data read from each radiation detection element are connected to other wiring. In some cases, it is possible to accurately determine whether or not there is a disconnection when compared with the variance or standard deviation of offset data read from each radiation detection element.

  However, in the invention described in Patent Document 1, as shown in FIG. 6 of the same document, five measurement areas are provided in the offset image, and the root mean square in each measurement area is calculated to calculate the RMS granularity. It is configured to check the RMS granularity of each measurement area and confirm whether it is within the specified range, etc., but this is the case when there is a disconnection outside each measurement area Cannot detect that a disconnection has occurred.

  The present invention has been made in view of the above-described problems, and provides a radiographic image capturing system and a radiographic image capturing device capable of accurately determining whether or not a disconnection has occurred in the radiographic image capturing device. For the purpose.

In order to solve the above-described problem, the radiographic imaging system of the present invention includes:
A plurality of scanning lines and a plurality of signal lines;
A plurality of radiation detection elements arranged two-dimensionally;
Scanning drive means for switching a voltage applied to each scanning line between an on-voltage and an off-voltage,
A switch that is connected to each scanning line and accumulates charges in the radiation detection element when an off voltage is applied, and discharges the charges accumulated in the radiation detection element to the signal line when an on voltage is applied. Elements,
A readout circuit for reading out the electric charge emitted from the radiation detection element as data;
Control means for controlling at least the scanning drive means and the readout circuit to perform the data readout process;
A communication means for communicating with the outside;
A radiographic imaging device comprising:
A console communicable with the radiographic apparatus,
With
The control means of the radiographic imaging apparatus performs a process of reading offset data that reads offset data for each radiation detection element in a state where no radiation is irradiated, and transmits the read offset data to the console.
The console,
To the signal line your capital before Symbol radiation image capturing apparatus, calculates a statistical value of the offset data,
In case of discrepancies and statistics of the offset data calculated for statistics and other of the signal lines of the offset data calculated for a said signal line is present the signal line exceeds the allowable range, the radiation image capturing It is determined that a disconnection has occurred in the apparatus.

Moreover, the radiographic imaging device of the present invention is
A plurality of scanning lines and a plurality of signal lines;
A plurality of radiation detection elements arranged two-dimensionally;
Scanning drive means for switching a voltage applied to each scanning line between an on-voltage and an off-voltage,
A switch that is connected to each scanning line and accumulates charges in the radiation detection element when an off voltage is applied, and discharges the charges accumulated in the radiation detection element to the signal line when an on voltage is applied. Elements,
A readout circuit for reading out the electric charge emitted from the radiation detection element as data;
Control means for controlling at least the scanning drive means and the readout circuit to perform the data readout process;
With
The control means includes
Perform offset data read processing for reading offset data for each radiation detection element in a state where radiation is not irradiated,
Calculating a statistical value of the offset data to the signal line your capital,
The case where the signal line is present a difference exceeds the allowable range of the statistical value of the offset data calculated for statistics and other of the signal lines of the offset data calculated for a said signal line, disconnection occurs It is determined that it is present.

  According to the radiographic imaging system and radiographic imaging apparatus of the system of the present invention, the radiographic imaging apparatus is dropped and the substrate is cracked due to the impact of dropping, or the signal line or the If the wiring is disconnected due to peeling of the wiring line such as the scanning line to the substrate, it can be accurately determined, and it is accurately determined whether or not the radiation imaging apparatus is disconnected. It becomes possible to do.

It is a figure showing the structure etc. of the radiographic imaging system which concerns on this embodiment. It is a perspective view which shows the external appearance of the radiographic imaging apparatus which concerns on this embodiment. It is sectional drawing which follows the XX line of FIG. It is a block diagram showing the equivalent circuit of a radiographic imaging apparatus. 6 is a timing chart for explaining the timing for applying an ON voltage to each scanning line when performing offset data read processing; It is a figure explaining the structure of the sensor board | substrate of a radiographic imaging apparatus, and the crack which entered the sensor board | substrate. It is a figure showing the state by which the flexible circuit board was connected to the input / output terminal and was drawn around to the back surface side of the sensor board. It is a figure showing the example of the offset data for every radiation detection element obtained when a some signal wire is intentionally disconnected. (A), (B) The figure showing the example of the standard deviation of offset data in the part of the signal line in which the disconnection has occurred, and the part of the signal line in which the disconnection has not occurred when performing the calculation of the following formula (1) It is. (A) It is the graph which plotted the offset data for every radiation detection element connected to the signal line, (B) It is a graph explaining several division etc. which divide | segment a signal line. It is a figure showing the example of the offset data for every radiation detection element obtained when a some scanning line is disconnected intentionally. (A), (B) is a diagram showing an example of offset data and a difference between a part of a signal line where a disconnection occurs and a part of a signal line where no disconnection occurs when performing the calculation of the following formula (1). is there. (A) It is the graph which plotted the average value of offset data for every scanning line, (B) It is a graph explaining how to take a moving average, etc.

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

  In the following, a so-called indirect radiation image is provided that includes a scintillator or the like as a radiation image capturing device, converts irradiated radiation into light of other wavelengths such as visible light with a scintillator, and obtains image data with a radiation detection element. Although the imaging apparatus will be described, the present invention can also be applied to a so-called direct type radiographic imaging apparatus that directly detects radiation with a radiation detection element without using a scintillator or the like.

   In the following, a case of a so-called portable radiographic imaging device in which a sensor panel is housed in a housing and can be carried will be described. In addition, the present invention can be applied.

  Further, in the following, as in the radiographic imaging system 100 shown in FIG. 1, offset data O or the like is transmitted from the radiographic imaging apparatus 1 to the console 50, and disconnection occurs in the wiring of the radiographic imaging apparatus 1 at the console 50. However, the control means 22 of the radiographic image capturing apparatus 1 does not transmit the offset data O or the like from the radiographic image capturing apparatus 1 to the console 50. It is also possible to configure to perform processing.

  1 shows a case where data or the like is transmitted from the radiographic imaging apparatus 1 to the console 50 by wireless communication. For example, the radiographic imaging apparatus 1 and the console 50 are connected by a cable (not shown) or the like. It is also possible to configure to transmit data etc. in a wired manner.

[Radiation imaging equipment]
A basic configuration of the radiographic image capturing apparatus according to the present embodiment will be briefly described. FIG. 2 is a perspective view showing an appearance of the radiographic image capturing apparatus, and FIG. 3 is a cross-sectional view taken along line XX of FIG. In this embodiment, the radiographic image capturing apparatus 1 is configured by housing a sensor panel SP including a scintillator 3 and a sensor substrate 4 in a housing 2 as shown in FIGS. 2 and 3. ing. In this embodiment, the housing | casing 2 is formed by obstruct | occluding the opening part of the both sides of 2 A of hollow square cylindrical housing main-body parts which have the radiation-incidence surface R with lid | cover members 2B and 2C.

  As shown in FIG. 2, a power switch 37, an operation switch 38, a connector 39, an indicator 40, and the like are arranged on the lid member 2 </ b> B on one side of the housing 2. In the present embodiment, an antenna 41 (see FIG. 4 to be described later) for communicating with an external device in a wireless manner is provided, for example, on the opposite side surface of the housing 2. In addition, power can be supplied from the outside via the connector 39, or communication with an external device can be performed in a wired manner.

  As shown in FIG. 3, a base 31 is disposed in the housing 2, and a sensor substrate 4 is provided on the radiation incident surface R side of the base 31 via a lead thin plate (not shown). It has been. On the upper surface side of the sensor substrate 4, a scintillator 3 that converts irradiated radiation into light such as visible light is provided on the scintillator substrate 34, and the scintillator 3 is provided in a state of facing the sensor substrate 4 side. Yes. Further, on the lower surface side of the base 31, a PCB substrate 33 on which electronic components 32 and the like are arranged, a battery 24, and the like are attached. In the present embodiment, the sensor panel SP is formed in this way. In addition, a buffer material 35 is provided between the sensor panel SP and the side surface of the housing 2.

  FIG. 4 is a block diagram showing an equivalent circuit of the radiographic image capturing apparatus. As shown in FIG. 4, in the radiographic imaging apparatus 1, a plurality of radiation detection elements 7 are arranged in a two-dimensional shape (matrix shape) on a sensor substrate (not shown), and the plurality of radiation detection elements 7 are two-dimensionally arranged. The entire region arranged in a shape, that is, the region indicated by a broken line in FIG.

  Each radiation detection element 7 has an electric charge corresponding to the dose of the irradiated radiation (more precisely, the electromagnetic wave irradiated when the radiation detection element 7 is irradiated with an electromagnetic wave obtained by converting the irradiated radiation by the scintillator 3. The electric charge according to the quantity of light) is generated. In the present embodiment, a photodiode is used as the radiation detection element 7. However, for example, a phototransistor, a CCD (Charge Coupled Device) image sensor, or the like may be used.

  A bias line 9 is connected to each radiation detection element 7, and the bias line 9 is connected to a connection 10. The connection 10 is connected to a bias power supply 14 so that a reverse bias voltage is applied from the bias power supply 14 to each radiation detection element 7 via the bias line 9 and the like.

  Each radiation detection element 7 is connected to a thin film transistor (hereinafter referred to as TFT) 8 as a switch element, and the TFT 8 is connected to the signal line 6. In the scanning drive unit 15, the on voltage and the off voltage supplied from the power supply circuit 15a via the wiring 15c are switched by the gate driver 15b and applied to the lines L1 to Lx of the scanning line 5. Yes. Then, each TFT 8 is turned on when an on-voltage is applied via the scanning line 5, discharges the charge accumulated in the radiation detection element 7 to the signal line 6, and also passes through the scanning line 5. When the off voltage is applied, the radiation state is turned off, the conduction between the radiation detection element 7 and the signal line 6 is interrupted, and the charge generated in the radiation detection element 7 is accumulated in the radiation detection element 7. It has become.

  A plurality of readout circuits 17 are provided in the readout IC 16, and the signal line 6 is connected to each readout circuit 17. In the reading process of the image data D, when the charge is released from the radiation detection element 7, the charge flows into the reading circuit 17 through the signal line 6, and the amplification circuit 18 corresponds to the amount of the charged charge. Output voltage value. A correlated double sampling circuit (described as “CDS” in FIG. 4) 19 reads out the voltage value output from the amplifier circuit 18 as analog value image data D and outputs it to the downstream side. The output image data D is sequentially transmitted to the A / D converter 20 via the analog multiplexer 21, and is sequentially converted into digital image data D by the A / D converter 20, and is output to the storage means 23. Are stored sequentially.

  The control means 22 is a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an input / output interface, etc., not shown, connected to the bus, an FPGA (Field Programmable Gate Array), or the like. It is configured. It may be configured by a dedicated control circuit. The control means 22 is connected to a storage means 23 composed of SRAM (Static RAM), SDRAM (Synchronous DRAM), NAND flash memory or the like.

  In addition, the control unit 22 is connected to a communication unit 25 that communicates with the outside in a wireless or wired manner via the antenna 41 or the connector 39. In this embodiment, the communication unit 25 communicates with the outside. Functioning as a communication means.

  The control unit 22 is connected to a power source 24 for supplying necessary power to each functional unit such as the scanning drive unit 15, the readout circuit 17, the storage unit 23, and the bias power source 14. Then, the control means 22 controls the operation of the scanning drive means 15 and the readout circuit 17 as described above during the reading process of the image data D, and the electric charges discharged from the radiation detection elements 7 are imaged. Data D is read out.

  Although the radiographic image capturing apparatus 1 according to the present embodiment can be mounted on an imaging stand (not shown) and used for imaging, the illustration is omitted. For example, it can be applied to the body of a patient as a subject, or can be used for photographing by being inserted between a patient and a bed, for example.

[console]
Although not shown, the console 50 (see FIG. 1) is composed of a computer in which a CPU, ROM, RAM, input / output interface, and the like are connected by a bus in this embodiment. Also good. In the present embodiment, the console 50 reads various programs such as system programs and processing programs stored in the ROM and the like, expands them in the RAM, and executes various processes according to the expanded programs. Yes.

  As shown in FIG. 1, the console 50 includes a display unit 51 configured by a CRT (Cathode Ray Tube), an LCD (Liquid Crystal Display), or the like, and is configured by an HDD (Hard Disk Drive) or the like. A storage means 52 is connected or built in. In addition, although not shown, input means such as a mouse and a keyboard are provided.

[Reading offset data with a radiographic imaging device]
Next, the reading process of the offset data O in the radiation image capturing apparatus 1 will be described.

  In the radiographic image capturing apparatus 1, the offset data O is read out immediately after or immediately before the image data D is read out at the time of imaging. However, the offset data O reading process described below is different from the reading process performed at the time of imaging as described above, whether or not a disconnection occurs in the radiographic image capturing apparatus 1, that is, the radiographic image capturing apparatus 1 in the first place. Since this process is performed for determining whether or not it can be used for shooting, it is usually performed before shooting.

  In the reading process of the offset data O for the disconnection determination process, for example, as shown in FIG. 5, the control unit 22 of the radiographic image capturing apparatus 1 first starts from the gate driver 15b (see FIG. 4) of the scanning driving unit 15. An ON voltage is sequentially applied to each of the lines L1 to Lx of the scanning line 5 (see the left side in FIG. 5), each TFT 8 is sequentially turned on, and the electric charge remaining in each radiation detection element 7 is released to the signal line 6. Then, the reset processing of the radiation detection elements 7 to be removed from the radiation detection elements 7 is performed.

  When the control unit 22 finishes resetting the predetermined radiation detection element 7, each line of the scanning line 5 from the gate driver 15 b in a state where the radiation imaging apparatus 1 is not irradiated with radiation as shown in FIG. 5. An off voltage is applied to L1 to Lx to shift to a charge accumulation state in which charges generated in each radiation detection element 7 (in this case, so-called dark charges) are accumulated in each radiation detection element 7.

  Then, after a predetermined time τ has elapsed since the transition to the charge accumulation state, the control unit 22 sequentially applies on-voltages to the lines L1 to Lx of the scanning line 5 from the gate driver 15b, and thereby each radiation detection element. The offset data O is read from the offset data O, and the offset data O is read out.

  In the present embodiment, the read offset data O is temporarily stored in the storage unit 23 of the radiographic image capturing apparatus 1 and then transmitted from the radiographic image capturing apparatus 1 to the console 50 by a wireless method or a wired method. When the control unit 22 of the radiographic image capturing apparatus 1 performs the determination process for determining whether or not the wiring of the radiographic image capturing apparatus 1 is disconnected as described above, the offset data O is stored in the console 50. Processing is performed in the radiation image capturing apparatus 1 without being transmitted.

[Regarding whether or not a disconnection has occurred in the radiation imaging apparatus]
Next, a determination process for determining whether or not the wiring of the radiographic imaging apparatus 1 is disconnected in the radiographic imaging system 100 according to the present embodiment will be described. Note that, as described above, the case where the determination process is performed by the console 50 will be described below, but the control of the radiographic image capturing apparatus 1 is performed without transmitting the offset data O or the like from the radiographic image capturing apparatus 1 to the console 50. The means 22 may be configured to perform the determination process, and in this case, the description will be made in the same manner as described below. The operation of the radiographic image capturing system 100 according to the present embodiment (the radiographic image capturing apparatus 1 when the determination process is performed by the radiographic image capturing apparatus 1) will also be described.

[Start timing of offset data read processing]
As described above, the reading process of the offset data O for the disconnection determination process in the radiographic imaging apparatus 1 is normally performed by the radiographic imaging apparatus 1 before imaging, but the control unit of the radiographic imaging apparatus 1 The trigger for starting the reading process of the offset data O at 22 can have various forms.

  That is, for example, it is possible to set a point in time when an operation by the operator is performed, such as when an operator such as a radiologist operates the operation switch 38, and the radiographic image capturing apparatus 1 at an arbitrary time interval. It is also possible to configure the system to automatically and periodically. In addition, the radiographic imaging apparatus 1 may be configured to automatically start based on a signal transmitted from the console 50 to the radiographic imaging apparatus 1. In addition, it is possible to configure to transmit a signal at an arbitrary time interval, or to transmit a signal when an operator such as a radiologist operates the console 50.

  Although not shown, for example, an impact detection means such as an acceleration sensor or a vibration sensor for detecting impact or vibration is provided in the housing 2 of the radiographic imaging apparatus 1, and the impact detection means detects the impact. At this point, the control means 22 of the radiographic image capturing apparatus 1 may be configured to automatically start the reading process of the offset data O.

  With this configuration, the offset data O is read out and transmitted to the console 50 before imaging or when an impact is applied to the radiographic image capturing apparatus 1, and the radiographic image capturing apparatus 1 is disconnected at the console 50 as described below. It is possible to accurately determine whether or not it has occurred. Therefore, when a disconnection occurs in the radiographic image capturing apparatus 1, it can be determined before imaging or when an impact is applied to the radiographic image capturing apparatus 1. It is accurately avoided to be used for shooting. Therefore, imaging is performed using the radiographic imaging device 1 in which a disconnection has occurred, and a radiographic image cannot be obtained appropriately, so that re-imaging is necessary, and the patient exposure dose increases. It is possible to accurately prevent the occurrence.

  Then, when the control means 22 of the radiographic image capturing apparatus 1 reads out the offset data O in this way, the read offset data O is transmitted to the console 50. When the console 50 receives the offset data O from the radiation image capturing apparatus 1, the console 50 performs the above determination process.

[Examples of how to disconnect the radiation imaging device]
Here, the example of the disconnection of the wiring in the radiographic imaging apparatus 1 assumed by this invention is demonstrated. In the present embodiment, as shown in FIG. 6, a plurality of scanning lines 5 and a plurality of scanning lines 5 are formed on the surface 4 a of the sensor substrate 4 (that is, the surface facing the scintillator 3 (see FIG. 3 and FIG. 7 described later)). The signal lines 6 are arranged so as to cross each other, and the radiation detection elements 7 are arranged in each small region r partitioned by the scanning lines 5 and the signal lines 6.

  In the present embodiment, each scanning line 5, each signal line 6, and the like are connected to input / output terminals (also referred to as pads) 11 provided in the vicinity of the edge of the sensor substrate 4. As shown in FIG. 7, each input / output terminal 11 is provided with an anisotropic conductive adhesive 12 having a flexible circuit board 12 in which chips such as the gate IC 15d and the readout IC 16 constituting the gate driver 15b described above are incorporated on a film. They are connected via an anisotropic conductive adhesive material 13 such as a film (Anisotropic Conductive Film) or an anisotropic conductive paste (Anisotropic Conductive Paste).

  The flexible circuit board 12 is routed to the back surface 4b (that is, the surface opposite to the above-described front surface 4a) side of the sensor substrate 4, and is connected to the above-described PCB substrate 33 and the like on the back surface 4b side. In the present embodiment, in this way, for example, the charges emitted from each radiation detection element 7 provided on the surface 4a side of the sensor substrate 4 are read out through the signal line 6, the input / output terminal 11, and the flexible circuit board 12. The data is read out as image data D by the IC 16 and stored in a storage means 23 (not shown) provided on the back surface 4 b side of the sensor substrate 4.

  When the radiographic image capturing apparatus 1 is dropped as described above, the corners of the housing 2 (see FIG. 2 etc.) of the radiographic image capturing apparatus 1 often collide with the floor surface. In this case, for example, as shown in FIG. 6, when cracks Cr enter or break at the corners of the sensor substrate 4, the scanning lines 5 and the signal lines 6 may be disconnected. Although FIG. 6 shows a case where the signal line 6 is disconnected, the scanning line 5 can be similarly disconnected.

  In addition, in the case where the radiographic image capturing apparatus 1 is a dedicated machine type integrally formed with a support base (not shown), it is difficult to consider that the radiographic image capturing apparatus 1 falls and the signal line 6 and the like are disconnected. Also in this case, for example, the connection between the input / output terminals 11 and the flexible circuit board 12 or the connection between the flexible circuit board 12 and the PCB board 33 is peeled off due to aging or the like. May break. This can also occur in the portable radiographic image capturing apparatus 1.

  In the present invention, it is assumed that the wiring such as the scanning line 5 and the signal line 6 is disconnected in the manner described above. When the wiring is disconnected in this way, the scanning line 5 is disconnected as described above and the TFT 8 is turned on or off even if the radiation detecting element 7 or the TFT 8 connected to the wiring is not broken. Cannot be applied properly, the signal line 6 is disconnected, and no charge flows from the radiation detection element 7 to the readout circuit 17, or the image data D read out by the readout circuit 17 is stored in the control means 22 or storage It cannot be sent to the means 23 side.

  That is, if the wiring such as the scanning line 5 and the signal line 6 of the radiographic image capturing apparatus 1 is disconnected, the radiographic image can be normally read out even if each radiation detecting element 7 is not broken. Will not be able to. For this reason, in the present embodiment, whether or not a break has occurred in the wiring of the radiation image capturing apparatus 1 is accurately determined as follows. Hereinafter, the determination process will be specifically described.

  As described above, in the normal case where neither the scanning line 5 nor the signal line 6 is disconnected, the charge accumulated in the radiation detecting element 7 is emitted from the radiation detecting element 7 in a state where no radiation is irradiated. Although it is read as offset data O, when the scanning line 5 and the signal line 6 are disconnected as described above, the offset data O is not normally read from the radiation detection element 7.

  However, in the process of reading the offset data O, each radiation detection element 7 connected to the scanning line 5 at the timing when the on-voltage is applied to the scanning line 5 from the gate driver 15b of the scanning driving unit 15. Some data is read from each read circuit 17. Therefore, hereinafter, the data read at the timing when the offset data O is read from a certain radiation detection element 7 in the process of reading the offset data O is referred to as offset data O for each radiation detection element 7.

  That is, in the offset data O for each radiation detection element 7, the scan line 5 and the signal line 6 are not disconnected, and the offset data O normally read from the radiation detection element 7 and the scanning line 5 or This includes any case where the signal line 6 is disconnected and the data is not normally read from the radiation detection element 7.

[Basic concept of disconnection judgment processing]
As described above, the disconnection determination processing according to the present invention does not determine the failure or the like of each radiation detection element 7, but determines whether or not the scanning line 5 or the signal line 6 is disconnected. is there. Therefore, in the present invention, the console 50 does not set the offset data O for each radiation detection element 7 connected to a certain scanning line 5 or a certain signal line 6 as a target of determination processing, but for each signal line 6, Alternatively, for each scanning line 5, a statistical value Ost such as an average value, median value (also referred to as median or intermediate value), standard deviation, variance or the like of offset data O for each connected radiation detection element 7 is calculated. The determination processing is performed on the statistical value Ost for each of the signal lines 6 and the scanning lines 5.

  That is, when the offset data O is transmitted from the radiographic imaging apparatus 1 as described above, the console 50 temporarily stores the offset data O in the storage unit 52. Then, the console 50 calculates a statistical value Ost (m) of the offset data O for each connected radiation detection element 7 for each signal line 6 of the radiation imaging apparatus 1. Here, m is the line number of the signal line 6. When there is a signal line 6 in which the difference between the calculated statistical value Ost (m) of the offset data O and the statistical value Ost (m) of the offset data O calculated for the other signal lines 6 exceeds an allowable range, It is determined that a disconnection has occurred in the radiation image capturing apparatus 1.

  Similarly, the console 50 calculates the statistical value Ost (n) of the offset data O for each connected radiation detection element 7 for each scanning line 5 of the radiation imaging apparatus 1 for the scanning line 5 as well. Note that n is the line number of the scanning line 5. When there is a scanning line 5 in which the difference between the calculated statistical value Ost (n) of the offset data O and the statistical value Ost (n) of the offset data O calculated for the other scanning lines 5 exceeds the allowable range, It is determined that a disconnection has occurred in the radiation image capturing apparatus 1.

  In the following, a case will be described in which the determination process is performed on the statistical value Ost of the offset data O calculated for each scanning line 5 or each signal line 6 of the radiographic imaging apparatus 1. Instead, for example, the statistical value Ost of the offset data O calculated for each of a plurality of scanning lines 5 and signal lines 6 such as two or three (that is, all radiation detections connected to the plurality of scanning lines 5 etc.) It is also possible to perform the determination process on the statistical value Ost) of the offset data O calculated on the element 7 as a target. With this configuration, it is possible to accurately determine whether or not there is a broken line in the scanning line 5 or the signal line 6, and each of the scanning line 5 or the signal line 6 is determined one by one. The determination process can be performed more quickly than when the determination process is performed as a target.

[About disconnection judgment processing for signal lines]
Hereinafter, a specific example of the disconnection determination process for the signal line 6 of the radiographic imaging apparatus 1 will be described first.

When the present inventors have studied the case where the signal line 6 is disconnected, the signal line 6 of the radiation imaging apparatus 1 is used as the statistical value Ost (m) of the offset data O for each signal line 6 described above. When the standard deviation σ (m) and variance σ ² (m) of the offset data O for each radiation detection element 7 connected to the signal line 6 are calculated every time, the standard deviation in the signal line 6 causing the disconnection is calculated. sigma (m) and variance σ ^{2 (m)} has been found that it may be smaller than the standard deviation sigma (m) and variance σ ^{2 (m)} in the normal signal line 6 which does not cause disconnection.

8 intentionally disconnects a plurality of signal lines 6 (wired so as to extend in the vertical direction in the figure) in the left part (alpha part in the figure) of the detection unit P. The offset data O for each radiation detection element 7 obtained in this case is shown in an image form. As shown in FIG. 8, the offset data O for each radiation detection element 7 connected to the disconnected signal line 6 (refer to the part α) is the signal line 6 that does not cause the disconnection (refer to the part β). Variation (that is, standard deviation σ (m) and variance σ ² (m)) is smaller than the offset data O for each radiation detection element 7 connected to. In FIG. 8, in order to make it easy to see the difference in variation of the offset data O, the signal lines 6 are disconnected very much. However, the actual disconnection usually occurs with a smaller number. This also applies to FIGS. 9A and 9B and FIGS.

As described above, when the signal line 6 is disconnected, the standard deviation σ (m) and the variance σ ² (m) of the offset data O in the signal line 6 that is disconnected are normal signals that are not disconnected. If the standard deviation σ (m) or variance σ ² (m) of the offset data O in the line 6 is smaller than the standard deviation σ (m) or the variance σ ² (m), for example, the console 50 The standard deviation σ (m) and variance σ ² (m) exceed the allowable range when compared with the standard deviation σ (m) and variance σ ² (m) of the offset data O calculated for the other signal lines 6. Therefore, when there is a small signal line 6, it is possible to determine that the radiation imaging apparatus 1 determines that a disconnection has occurred.

  More specifically, taking the case of calculating the standard deviation σ (m) as an example, the console 50 calculates the standard deviation σ (m) of the offset data O for each signal line 6 of the radiographic imaging apparatus 1. The minimum value Min (σ (m)) is extracted from the calculated standard deviation σ (m) of the offset data O, and the average value Ave of the standard deviation σ (m) of the offset data O for each signal line 6 is extracted. (σ (m)) is calculated or the median value Median (σ (m)) is extracted. Hereinafter, a case where the median value Median (σ (m)) is extracted will be described.

  The console 50 then calculates the ratio Min (σ (m)) / Median (σ () of the median Median (σ (m)) of the minimum value Min (σ (m)) of the standard deviation σ (m) of the offset data O. m)) is calculated as a determination index. When the calculated ratio Min (σ (m)) / Median (σ (m)) is less than the set threshold value σth, the standard deviation σ (m) of the offset data O is smaller than the other signal lines 6. It is considered that there is a signal line 6 and the signal line 6 is broken. Therefore, when the calculated ratio Min (σ (m)) / Median (σ (m)) is less than the set threshold value σth, the console 50 determines that a disconnection has occurred in the radiographic image capturing apparatus 1. It can be configured to do so.

If comprised in this way, the radiographic imaging device 1 is a normal signal with which the standard deviation (sigma) (m) and dispersion | distribution (sigma) ² (m) of the offset data O in the signal wire 6 which has produced the disconnection have not produced the disconnection When the characteristic is smaller than the standard deviation σ (m) and variance σ ² (m) of the offset data O in the line 6, it is calculated as the statistical value Ost (m) of the offset data O as described above. The standard deviation σ (m) and variance σ ² (m) of the offset data O for each signal line 6 are compared with the standard deviation σ (m) and variance σ ² (m) of the offset data O in other signal lines 6. This makes it possible to accurately determine whether or not the signal line 6 of the radiographic image capturing apparatus 1 is broken.

[Modification 1]
In the radiographic imaging apparatus 1, when the scanning line 5 is disconnected, the standard deviation σ (n) and the variance σ ² (n) of the offset data O in the scanning line 5 in which the disconnection occurs are disconnected. The above-described determination method can also be applied to a case where there is a characteristic that is smaller than the standard deviation σ (n) or variance σ ² (n) of the offset data O in the normal scan line 5 that is not present. is there.

Further, depending on the radiographic image capturing device 1, when the signal line 6 or the scanning line 5 is disconnected, the standard deviation σ or the variance σ ² of the offset data O in the signal line 6 or the scanning line 5 causing the disconnection may be disconnected. There is a case where the standard deviation σ and the variance σ ² of the offset data O in the normal signal line 6 and the scanning line 5 that do not cause the difference are larger.

In such a case, for example, the minimum value Min (σ (σ ()) from the standard deviation σ (m) (or variance σ ² (m), the same applies hereinafter) of the offset data O for each signal line 6 as described above. m)) is extracted instead of the maximum value Max (σ (m)), and the median value Median (σ (m)) of the maximum value Max (σ (m)) (or the average value Ave (σ (m)) )), When the ratio Max (σ (m)) / Median (σ (m)) is larger than the set threshold value σth, it is determined that the disconnection has occurred in the radiographic imaging apparatus 1. It is possible to configure. The same applies to the case of standard deviation σ (n) and variance σ ² (n) of offset data O for each scanning line 5.

As described above, when the signal line 6 or the scanning line 5 is disconnected by the radiographic image capturing apparatus 1, the standard deviation σ or the variance σ ² of the offset data O in the signal line 6 or the scanning line 5 causing the disconnection is There is a possibility that the characteristics may be different by becoming larger or smaller than the standard deviation σ and variance σ ² of the offset data O in the normal signal line 6 and the scanning line 5 in which no disconnection has occurred. Therefore, it is desirable to grasp the characteristics of the radiation image capturing apparatus 1 in advance, and to apply a determination process in a manner corresponding to the characteristics in the console 50.

  Further, the determination method in the console 50 (that is, the minimum values Min (σ (m)) and Min (σ (n)) are extracted from the standard deviation σ of the offset data O for each signal line 6 or scanning line 5. The maximum value Max (σ (m)), Max (σ (n)) or the like is extracted) may be switched for each radiographic imaging apparatus 1 according to the characteristics.

[Modification 2]
Incidentally, the readout circuit 17 (see FIG. 4) of the radiographic image capturing apparatus 1 usually does not necessarily have a uniform readout characteristic, and the circuit-specific offset amount superimposed on the readout offset data O differs for each readout circuit 17. In FIG. 11 to be described later, the signal line 6 (not shown in FIG. 11 is wired so as to extend in the vertical direction in the drawing) is vertically divided at the center portion on the detection unit P. The offset data O is read by each readout circuit 17 (not shown) provided in each of the vertical directions of FIG. 11, but as shown in FIG. 11, a specific offset amount superimposed on the read offset data O is read. Different for each circuit 17, that is, for each signal line 6. The portion γ in FIG. 11 will be described later.

Even if the specific offset amount superimposed on the offset data O is different for each signal line 6 as described above, this is a variation of the offset data O, that is, the standard deviation σ (m) or variance σ ^{2 of the} offset data O. If it does not affect (m), for example, the above-described determination processing based on the offset data O (that is, its standard deviation σ (m) or variance σ ² (m)) for each radiation detection element 7 as shown in FIG. Can be configured to do.

In addition, when the standard deviation σ (m) and the variance σ ² (m) of the offset data O are different for each signal line 6 as described above, there is an influence of a specific offset superimposed on the offset data O. In order to eliminate this influence (or if it is unclear whether or not there is an influence), for example, the second offset data O ^* is acquired separately from the offset data O, and the radiation detection element 7 is obtained. Every time, the difference ΔO between the offset data O and the second offset data O ^* is calculated according to the following equation (1), and the above-described determination process is used for the difference ΔO instead of the offset data O, and the calculated radiation detection It is also possible to perform the determination process based on the statistical value ΔOst (m) of the difference ΔO of the signal line 6 calculated based on the difference ΔO for each element 7. FIG. 8 described above shows not the offset data O but the difference ΔO calculated in this way.
ΔO = O−O ^* (1)

In order to distinguish the offset data O from the second offset data O ^* , the first offset data O will be described. When configured as described above, the second offset data O ^* is the first offset data O ^*. It needs to be read out by a reading process different from the data O. If the first offset data O is diverted as the second offset data O ^* , naturally, the difference ΔO becomes 0 in each radiation detection element 7 calculated by the above equation (1). It is.

When the standard deviation σ (m) of the offset data O is used as the statistical value Ost (m) of the offset data O for each signal line 6 as described above, the radiation image is used as the second offset data O ^*. It is possible to use the offset data read before the signal line 6 of the radiographic imaging device 1 is broken, such as the offset data read at the time of factory shipment of the imaging device 1 or the like.

Further, as the second offset data O ^* , it is also possible to use offset data read after the disconnection of the signal line 6 of the radiographic imaging device 1 occurs. It is preferable to configure. The reason will be described below.

For example, the standard deviation σ (m) (or variance σ ² (m) of the offset data O before the signal line 6 is disconnected is read), that is, the signal line 6 is read without being disconnected. The value of the standard deviation σ (m) of the offset data O is 3, and reading is performed in a state where the standard deviation σ (m) of the offset data O after the disconnection of the signal line 6, that is, the signal line 6 is disconnected. It is assumed that the standard deviation σ (m) value of the offset data O is 2.

  Then, as shown in FIG. 8, in the first offset data O read out in a state where the disconnection occurs in the portion α in the drawing, as shown in FIG. The standard deviation σ (m) of the first offset data O for each line 6 is 2, and the standard deviation σ (1) of the first offset data O for each signal line 6 in the other part (the part of β in the figure). m) is 3.

When the offset data read before the disconnection of the signal line 6 is used as the second offset data O ^{*, such} as when the radiation imaging apparatus 1 is shipped from the factory, as shown in FIG. In the second offset data O ^* , the standard deviation σ (m) of the second offset data O ^* for each signal line 6 is 3 in all the signal lines 6.

Therefore, as shown in FIG. 9A, the standard deviation σ (m) of the difference ΔO for each signal line 6 calculated based on the difference ΔO calculated according to the above equation (1) is disconnected in the signal line 6. (2 ² +3 ² ) ^1/2 = √13 in the portion where α is generated (α portion), whereas 3√2 (== in the portion where β is not broken in the signal line 6 (β portion). √18).

On the other hand, as the second offset data O ^* , when the offset data read after the disconnection of the signal line 6 of the radiation imaging apparatus 1 is used, as shown in FIG. In both the offset data O and the second offset data O ^* , the standard deviation σ (m) is 2 in the signal line 6 of the part α (that is, the part where the disconnection occurs), and the other part (part of β) The standard deviation σ (m) is 3 in the signal line 6.

  Therefore, in this case, as shown in FIG. 9B, the standard deviation σ (m) of the difference ΔO for each signal line 6 calculated based on the difference ΔO calculated according to the above equation (1) is a signal. 2√2 (= √8) in the portion where the wire 6 is broken (α portion), and 3√2 (= √18) in the portion where the signal line 6 is not broken (β portion). become.

As described above, as shown in FIG. 9B, it is more preferable to use the offset data read out in the state where the signal line 6 is read out as the second offset data O ^* . The difference (√8 and √) in the standard deviation σ (m) of the difference ΔO for each signal line 6 between the part where the signal line 6 is disconnected (the part α) and the part where the disconnection does not occur (the part β) 18) is read as the second offset data O ^* as shown in FIG. 9 (A) in a state where the signal line 6 is not broken as in the case of factory shipment of the radiographic imaging apparatus 1 or the like. Compared with the case where offset data is used (the difference in standard deviation σ (m) of the difference ΔO for each signal line 6 is √13 and √18), it appears larger.

Therefore, using the standard deviation σ (m) and variance σ ² (m) of the offset data O as the statistical value Ost (m) of the offset data O for each signal line 6 as described above, the above determination processing is performed using the offset data. When the difference ΔO calculated according to the above equation (1) is used instead of O as a target, the second offset data O ^* is used when the radiographic imaging apparatus 1 is shipped from the factory as described above. It is possible to use the offset data read before the signal line 6 of the radiographic imaging apparatus 1 is disconnected as described above, but the reading is performed after the signal line 6 of the radiographic imaging apparatus 1 is disconnected. It is preferable that the offset data is used.

In the case of such a configuration, for example, at the timing when the radiographic imaging apparatus 1 reads the first offset data O as described above, the second offset is read after the first offset data O is read. It is possible to read the data O ^* (that is, read the offset data for two frames) and transmit the first offset data O and the second offset data O ^* from the radiation imaging apparatus 1 to the console 50. It is.

If the signal line 6 is disconnected at the timing of reading out the first offset data O as described above in the radiographic imaging apparatus 1, the second offset data O ^* read out in the subsequent readout process is The data is read after the disconnection has occurred in the radiation image capturing apparatus 1, and the difference in the standard deviation σ (m) of the difference ΔO for each signal line 6 appears greatly as described above.

Further, after reading the first offset data O and the second offset data O ^* , the radiation image capturing apparatus 1 calculates the difference ΔO for each radiation detection element 7 according to the above equation (1), and calculates the calculated difference ΔO. Can be configured to be transmitted to the console 50. If comprised in this way, compared with the case where the 1st offset data O and the 2nd offset data O ^* are transmitted to the console 50, it will become possible to reduce the data amount transmitted to the console 50. FIG.

[Modification 3]
Further, the offset data O for each radiation detection element 7 connected to a certain signal line 6 is plotted in the order of the number of the radiation detection element 7 (that is, in the order of the line number n of the scanning line 5 to which the radiation detection element 7 is connected). Then, for example, as shown in FIG. 10 (A), the offset data O for each radiation detection element 7 does not have the same value in each radiation detection element 7 but has a trend of gradually changing as a whole. There may be. The trend of the offset data O may affect the standard deviation σ (m) and variance σ ² (m) for each signal line 6 calculated based on the offset data O.

Therefore, in such a case, when calculating the standard deviation σ (m) and variance σ ² (m) of the offset data O for each signal line 6 of the radiographic imaging apparatus 1, for example, FIG. As shown, the signal line 6 is divided into a plurality of sections dk (that is, each radiation detection element 7 connected to the signal line 6 is divided into sections d1, d2,...), And the offset data O for each section dk. Standard deviation σ and variance σ ² are calculated. Then, calculate the average or median value of the standard deviation sigma and variance sigma ² offset data O per calculated division dk, it the standard deviation of the offset data O of the signal line 6 sigma (m) and variance sigma ² It can be configured to calculate as (m).

If the standard deviation σ (m) and variance σ ² (m) of the offset data O for each signal line 6 are calculated in this way, for example, as shown in FIG. Even if each offset data O has some trend, the standard deviation σ (m) and variance σ ² (m) of the offset data O for each signal line 6 are not affected by the trend. Can be accurately calculated.

[About disconnection determination processing for scanning lines]
Next, a specific example of the disconnection determination process for the scanning line 5 of the radiation image capturing apparatus 1 will be described.

When the present inventors have studied the case where the disconnection occurs in the scanning line 5, the scanning in the case where the disconnection occurs in the scanning line 5 is different from the case where the disconnection occurs in the signal line 6. Standard deviation σ (n) and variance σ ² (n) of offset data O for each line 5 (that is, standard deviation σ (n) and variance of offset data O for each radiation detection element 7 connected to the scanning line 5) Even if σ ² (n)) is compared with the standard deviation σ (n) and variance σ ² (n) of the offset data O for each scanning line 5 when the scanning line 5 is not broken, there is not much difference. Rather, it is understood that the value of the offset data O for each radiation detection element 7 when the scanning line 5 is disconnected may be larger than that when the scanning line 5 is not disconnected. Yes. The reason why such a phenomenon occurs is not well understood.

  FIG. 11 intentionally includes a plurality of scanning lines 5 (wired so as to extend in the horizontal direction in the figure) in the lower part (gamma part in the figure) of the detection unit P. The offset data O for each radiation detection element 7 obtained when the wire is disconnected is shown in an image form. In FIG. 11, unlike FIG. 8, offset data O is represented instead of the difference ΔO.

  In this case, as shown in FIG. 11, the offset data O for each radiation detection element 7 connected to the disconnected scanning line 5 (see the part γ) is the scanning line 5 in which no disconnection occurs. The value is larger than the offset data O for each radiation detection element 7 connected to (refer to a part other than γ).

  Thus, when the scanning line 5 is disconnected, the offset data O in the scanning line 5 in which the disconnection has occurred becomes larger than the offset data O in the normal scanning line 5 in which the disconnection has not occurred. The console 50 calculates the average value Oave (n) and the median value Omed (n) of the offset data O for each scanning line 5 as the statistical value Ost of the offset data O (that is, radiation connected to the scanning line 5). The average value Oave (n) or the like of the offset data O for each detection element 7 is calculated, and the calculated average value Oave (n) or median value Omed (n) of the offset data O is calculated for the other scanning lines 5. When there is a scanning line 5 that exceeds the allowable range when compared with the average value Oave (n) and the median value Omed (n) of the offset data O, the radiation image capturing apparatus 1 has a disconnection. I will judge It can be configured to.

  More specifically, taking the case where the average value Oave (n) of the offset data O is calculated as an example, the console 50 calculates the average value Oave (n) of the offset data O for each scanning line 5 of the radiation image capturing apparatus 1. ) And the maximum value Max (Oave (n)) is extracted from the average value Oave (n) of the calculated offset data O. Then, an average value Ave (Oave (n)) of the average value Oave (n) of the offset data O for each scanning line 5 is calculated. Alternatively, the median value Median (Oave (n)) of the average value Oave of the offset data O for each scanning line 5 is extracted. In the following, a case where the median value Median (Oave (n)) of the average value Oave of the offset data O is extracted will be described.

  The console 50 then compares the maximum value Max (Oave (n)) with respect to the median value Median (Oave (n)) of the average value Oave of the offset data O, Max (Oave (n)) − Median (Oave ( n)) is calculated as a determination index. When the calculated difference Max (Oave (n)) − Median (Oave (n)) is larger than the set threshold value Oth, there is a scanning line 5 in which the offset data O is larger than the other scanning lines 5, and It is considered that the disconnection occurs in the scanning line 5. Therefore, when there is a scanning line 5 in which the calculated difference Max (Oave (n)) − Median (Oave (n)) exceeds the set threshold value Oth, the console 50 is disconnected in the radiographic image capturing apparatus 1. It can be configured to determine that it has occurred.

  If comprised in this way, the radiographic imaging apparatus 1 has the characteristic that the offset data O in the scanning line 5 which has produced the disconnection becomes larger than the offset data O in the normal scanning line 5 which has not produced the disconnection. If the average value Oave (n) or the median value Omed (n) of the offset data O for each scanning line 5 calculated as the statistical value Ost (n) of the offset data O is used as described above, By comparing with the average value Oave (n) and the median value Omed (n) of the offset data O in FIG. 5, it is possible to accurately determine whether or not the scanning line 5 of the radiographic image capturing apparatus 1 is broken. It becomes possible.

[Modification 4]
Note that, depending on the radiographic imaging device 1, when the scanning line 5 is disconnected, the average value Oave (n) and the median value Omed (n) of the offset data O in the scanning line 5 in which the disconnection occurs are disconnected. In some cases, the average value Oave (n) or the median value Omed (n) of the offset data O in the normal scanning line 5 that is not present may be smaller.

  In such a case, for example, as described above, the maximum value Max (Oave (n) from the average value Oave (n) (or the median value Omed (n); the same applies hereinafter) of the offset data O for each scanning line 5 is used. n)) is extracted instead of the minimum value Min (Oave (n)), and the minimum value Min (Oave (n)) of the average value Oave of the offset data O with respect to the median value Median (Oave (n)) When the difference Min (Oave (n)) − Median (Oave (n)) is less than the set threshold value Oth, the radiographic imaging apparatus 1 may be determined to be disconnected. Is possible.

  Further, in the radiographic imaging apparatus 1, when the signal line 6 is disconnected instead of the scanning line 5, the average value Oave (m) and the median value Omed (m) of the offset data O in the signal line 6 that has been disconnected. However, the above-described determination method is also applied to the case where the average value Oave (m) or the median value Omed (m) of the offset data O in the normal signal line 6 that is not disconnected is larger or smaller. Is possible.

  As described above, when the scanning line 5 or the signal line 6 is disconnected by the radiographic image capturing apparatus 1, the average value Oave or the median value Omed of the offset data O in the scanning line 5 or the signal line 6 in which the disconnection occurs is There is a possibility that the characteristics may be different by becoming larger or smaller than the average value Oave or the median value Omed of the offset data O in the normal scanning line 5 or signal line 6 in which no disconnection has occurred. Therefore, it is desirable to grasp the characteristics of the radiation image capturing apparatus 1 in advance, and to apply a determination process in a manner corresponding to the characteristics in the console 50.

  In addition, the determination process in the console 50 (that is, the maximum value Max (Oave (m)) of the average value Oave (m), Oave (n) of the offset data O for each scanning line 5 and signal line 6, Whether to extract Max (Oave (n)) or minimum value OMin (Oave (m)), Min (Oave (n)), etc.) for each radiographic imaging device 1 according to its characteristics It is also possible to configure.

[Modification 5]
Also in this case, instead of using the offset data O itself, the difference ΔO between the first offset data O and the second offset data is calculated for each radiation detection element 7 according to the above equation (1), and the calculated difference is calculated. For ΔO, for example, a statistical value of the difference ΔO for each scanning line 5 is calculated based on the calculated difference ΔO for each radiation detection element 7, and it is determined whether or not a disconnection has occurred in the radiation imaging apparatus 1. It is also possible to configure as described above. However, in this case, attention should be paid because there are differences from the case of the second modification.

That is, in the above-described modification 2, the difference ΔO between the first offset data O and the second offset data O ^* read before disconnection occurs in the radiographic image capturing apparatus 1 (see FIG. 9A). ) May be used, but the difference ΔO between the first offset data O and the second offset data O ^* read out after the disconnection of the radiation image capturing apparatus 1 occurs (FIG. 9B). The difference in the standard deviation σ (m) of the difference ΔO for each signal line 6 between the portion where the disconnection occurs (α portion) and the portion where the disconnection does not occur (β portion) is larger. Because it appears, it explained what was preferable.

However, as described above, when the disconnection is determined based on the average value Oave and the median value Omed of the offset data O instead of the offset data O and the standard deviation σ of the difference ΔO, the first offset If the difference ΔO between the data O and the second offset data O ^* read after the disconnection of the radiographic imaging apparatus 1 is calculated, the first offset data O is the radiographic imaging apparatus 1. If the offset data O is read after the disconnection occurs, the difference ΔO with respect to the second offset data O ^* becomes almost zero in all the scanning lines 5 and signal lines 6.

  That is, for example, as described above, when the offset data O for each radiation detection element 7 when the scanning line 5 is disconnected is larger than that when the scanning line 5 is not disconnected, for example, FIG. As shown in FIG. 12A, the first offset data O of the portion of γ where the disconnection occurs in the scanning line 5 is 200, and the other portion where the disconnection does not occur in the scanning line 5 (γ in the drawing) It is assumed that the first offset data O of the other part is 100.

In this case, the second offset data O ^* read after the disconnection in the radiographic image capturing apparatus 1 is also represented by γ in which the disconnection occurs in the scanning line 5 as shown in FIG. It is 200 in the portion, and is 100 in the other portion (the portion other than γ in the figure) where the scanning line 5 is not broken. Therefore, when the difference ΔO is calculated for each radiation detection element 7 in accordance with the above equation (1), the difference ΔO becomes almost zero for all the radiation detection elements 7.

On the other hand, in the above example, as the second offset data O ^* , if the offset data read before disconnection of the radiographic image capturing apparatus 1 occurs at the time of factory shipment of the radiographic image capturing apparatus 1 or the like, As shown in FIG. 12B, since the second offset data O ^* is offset data read before the disconnection of the scanning line 5 occurs, it becomes 100 for all the radiation detection elements 7. Therefore, as shown in FIG. 12B, when the difference ΔO between the first offset data O and the second offset data O ^* is calculated, the difference ΔO is calculated in the portion of γ where the disconnection occurs in the scanning line 5. 100, and almost zero in other portions where the scanning line 5 is not broken (portions other than γ in the figure).

As described above, if the offset data read before the disconnection occurs in the radiation image capturing apparatus 1 is used as the second offset data O ^* , a portion where the disconnection occurs in the scanning line 5 (portion of γ) The difference ΔO can be clearly distinguished from other parts where no disconnection occurs (parts other than γ in the figure). Therefore, if the threshold value is appropriately set, it is possible to accurately determine whether or not the radiation image capturing apparatus 1 is disconnected by determining whether or not the difference ΔO exceeds the threshold value.

Therefore, when the disconnection is determined based on the average value Oave or the median value Omed of the offset data O for each scanning line 5 or signal line 6 as described above, reading is performed after the radiation image capturing apparatus 1 is disconnected. The first offset data O, not the second offset data O ^{* that} has been read, and the second read before the radiation image capturing apparatus 1 is disconnected, such as when the radiation image capturing apparatus 1 is shipped from the factory. It is preferable that the difference ΔO with the offset data O ^* is calculated.

And if comprised in this way, as shown, for example in FIG. 11, even if it is a case where the specific offset part superimposed on the offset data O for every signal line 6 differs, according to said (1) Formula, it is 1st. When the difference ΔO for each radiation detection element 7 is calculated by subtracting the second offset data O ^* from the offset data O, the specific offset amount superimposed on the offset data O for each signal line 6 is canceled out. . Therefore, the difference ΔO does not include the influence of the specific offset superimposed on the offset data O for each signal line 6.

  Therefore, there is an effect that it is possible to accurately determine whether or not a disconnection has occurred without being affected by a specific offset superimposed on the offset data O for each signal line 6.

In the case of such a configuration, it is also possible to use the offset data read at the time of factory shipment of the radiographic imaging apparatus 1 as described above as the second offset data O ^* . In addition, for example, the first offset data O obtained when it is determined in the previous determination process that no disconnection has occurred in the radiographic image capturing apparatus 1 is stored and used as the second offset data O ^*. It is also possible to configure as described above.

  Similarly to the second modification, the radiographic imaging device 1 is configured to calculate the difference ΔO for each radiation detection element 7 in accordance with the above equation (1) and transmit the calculated difference ΔO to the console 50. Is also possible.

[Modification 6]
By the way, in the above configuration example, the average value Oave (n) (or median value Omed (n) of the offset data O for each scanning line 5 (or signal line 6; the same applies hereinafter) of the radiographic imaging apparatus 1; .) And the median value Median (Oave (n) of the average value Oave (n) of the offset data O and the maximum value Max (Oave (n)) of the calculated offset data O and the average value Oave (n) of the offset data O. )) And the difference between the maximum value Max (Oave (n)) and the median Median (Oave (n)) of the average value Oave (n) of the offset data O, Max (Oave (n)) − Median (Oave (n)) as a determination index, and when there is a scanning line 5 in which the calculated difference Max (Oave (n)) − Median (Oave (n)) exceeds a set threshold value Oth, the radiation concerned A case has been described in which the image capturing device 1 is configured to determine that a disconnection has occurred.

  However, the average value Oave (n) and the median value Omed (n) of the offset data O are calculated for each scanning line 5 of the radiation imaging apparatus 1 as the statistical value Ost (n) of the offset data, and the calculated scanning line 5 When comparing the average value Oave (n) and the median value Omed (n) of the offset data O with the average value Oave (n) and the median value Omed (n) of the offset data O calculated for the other scanning lines 5 In addition, when there is a scanning line 5 that exceeds the allowable range, a method of determining that a disconnection has occurred in the radiation image capturing apparatus 1 can be configured as follows, for example.

In this case, as the statistical value Ost of the offset data O, the average value Oave (n) and the median value Omed (n) of the offset data O are calculated for each scanning line 5 of the radiation imaging apparatus 1 as described above. Further, as described above, the difference ΔO between the first offset data O and the second offset data O ^* read out before the disconnection of the radiation image capturing apparatus 1 occurs. And the average value ΔOave (n) or median value ΔOmed (n) of the calculated difference ΔO for each scanning line 5 can be calculated. In the following, a case where the average value Oave (n) of the offset data O for each scanning line 5 is calculated will be described, but the other cases will be described in the same manner.

  In this case, when the average value Oave (n) of the offset data O for each scanning line 5 is plotted in the order of the line number n of the scanning line 5, for example, as shown in FIG. The average value Oave (n) of the offset data O for each scanning line 5 in the portion γ is the average value Oave (n) of the offset data O for each scanning line 5 in the other portion (that is, the portion where no disconnection occurs). ) Larger than

  Note that the average value Oave (n) of the offset data O for each scanning line 5 in the portion where the disconnection occurs (γ portion) is the same for each scanning line 5 in the other portion (that is, the portion where no disconnection occurs). As described above, the offset data O may be smaller than the average value Oave (n). In FIGS. 13A and 13B, only the average value Oave (n) of the offset data O for each portion of the scanning line 5 in the vicinity of the portion where the scanning line 5 is broken is shown. A case where a disconnection occurs only in one scanning line 5 is shown.

  As shown in FIG. 13A, even if the average value Oave (n) of the offset data O for each scanning line 5 has a gradual trend, if the scanning line 5 is disconnected, the scanning line 5 The average value Oave (n) of the offset data O for each scanning line 5 in the portion 5 is clearly different from the trend, and is significantly different from the average value Oave (n) in the other scanning lines 5.

  Therefore, for example, an average value Oave (n) of offset data calculated for a certain scanning line 5 and a scanning line 5 within a predetermined range from the scanning line 5 (that is, a predetermined line including the scanning line 5 adjacent to the scanning line 5). The difference δOave between the average value Oave (n) of the offset data O calculated for the number of scanning lines 5) and the moving average MA (Oave (n)) is calculated, and the absolute value | δOave | of the calculated difference δOave is set. When there is a scanning line 5 exceeding the set threshold value, it is possible to determine that the disconnection has occurred in the radiographic image capturing apparatus 1.

  When the number of scanning lines 5 configured as described above and calculating the moving average MA (Oave (n)) is, for example, four, for example, as shown in FIG. In the line number na), the absolute value | δOave | of the difference δOave between the average value Oave (n) of the offset data calculated for the scanning line 5 and the moving average MA (Oave (n)) is very small. On the other hand, in the scanning line 5 (line number nγ) causing the disconnection, the difference δOave between the average value Oave (n) of the offset data calculated for the scanning line 5 and the moving average MA (Oave (n)). The absolute value of | δOave |

  Therefore, if the threshold value set for the absolute value | δOave | of the difference δOave between the average value Oave (n) of the offset data calculated for the scanning line 5 and the moving average MA (Oave (n)) is appropriately set, the calculation is performed. By determining whether or not the absolute value | δOave | exceeds the threshold value, it is possible to accurately determine whether or not the radiation image capturing apparatus 1 is disconnected. In addition, as described above, even if there is a gradual trend in the average value Oave (n) of the offset data O for each scanning line 5, is the disconnection occurring in the radiographic image capturing apparatus 1 regardless of this? It is possible to accurately determine whether or not.

  In the above case, the difference between the average value Oave (n) of the offset data calculated for a certain scanning line 5 and the average value Oave (n) of the offset data calculated for the adjacent scanning line 5 is calculated. Although it can be configured, this corresponds to the case where the number of scanning lines 5 for calculating the moving average is one when calculating the moving average MA (Oave (n)). Therefore, calculating the difference between the average value Oave (n) of the offset data calculated for a certain scanning line 5 and the average value Oave (n) of the offset data calculated for the scanning line 5 adjacent thereto is ultimately the above. As described above, the difference δOave between the average value Oave (n) of the offset data calculated for a certain scanning line 5 and the moving average MA (Oave (n)) is included.

[Notifying that there is a possibility of disconnection in the radiographic imaging device]
When the console 50 (or the control unit 22 of the radiographic imaging device 1) performs the disconnection determination process as described above, and as a result, it is determined that the radiographic imaging device 1 has a disconnection, Display on the display unit 51 (see FIG. 1), generate sound, or turn on and blink the indicator 40 (see FIG. 2) of the radiographic image capturing apparatus 1 in a predetermined color or from the radiographic image capturing apparatus 1. It can be configured to notify or notify that there is a possibility of disconnection in the radiographic image capturing apparatus 1 by generating sound or the like.

  In addition, the radiographic imaging apparatus 1 is notified that there is a possibility of disconnection, for example, by displaying on an external device (not shown) such as a display device or a speaker installed in the imaging room or by generating sound. It is possible to configure so that the Furthermore, it is also possible to configure so as to display that fact or generate sound on a plurality of devices such as the console 50, the radiographic imaging device 1, and an external device.

  With this configuration, a radiographer or other photographer does not use the radiographic image capturing apparatus 1 for radiographic image capturing, calls a service person to repair the radiographic image capturing apparatus 1, or a radiographic image Appropriate measures can be taken, such as sending the imaging device 1 to a manufacturer or the like and requesting repairs.

[effect]
As described above, according to the radiographic image capturing system 100 and the radiographic image capturing apparatus 1 according to the present embodiment, the signal line 6 and the scanning of the offset data O read by the radiographic image capturing apparatus 1 without being irradiated with radiation. A statistical value Ost for each line 5 is calculated, and the difference between the statistical value Ost of the offset data O calculated for a certain signal line 6 and the statistical value Ost of the offset data O calculated for another signal line 6 exceeds an allowable range. When there is a line 6, or there is a scanning line 5 in which the difference between the statistical value Ost of the offset data O calculated for a certain scanning line 5 and the statistical value Ost of the offset data O calculated for another scanning line 5 exceeds an allowable range. When present, the radiographic imaging device 1 is configured to determine that a disconnection has occurred.

  Therefore, the radiation image capturing apparatus 1 is dropped and the sensor substrate 4 is broken by the impact of the fall (see FIG. 6), or the sensor substrate of the wiring such as the signal line 6 and the scanning line 5 is caused by the impact of the fall or deterioration over time. When the wiring is disconnected due to the part attached to 4 (see the part of the input / output terminal 11 in FIG. 7) being peeled off, it can be accurately determined, and the radiation imaging apparatus 1 is disconnected. It is possible to accurately determine whether or not there is.

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

DESCRIPTION OF SYMBOLS 1 Radiographic imaging device 5 Scanning line 6 Signal line 7 Radiation detection element 8 TFT (switch element)
15 Scanning drive means 17 Reading circuit 22 Control means 25 Communication part (communication means)
50 Console 100 Radiological imaging system D Image data (data)
dk Category O Offset data (data)
O ^* Second offset data Ost Statistical value ΔO Difference

Claims (15)

A plurality of scanning lines and a plurality of signal lines;
A plurality of radiation detection elements arranged two-dimensionally;
Scanning drive means for switching a voltage applied to each scanning line between an on-voltage and an off-voltage,
A switch that is connected to each scanning line and accumulates charges in the radiation detection element when an off voltage is applied, and discharges the charges accumulated in the radiation detection element to the signal line when an on voltage is applied. Elements,
A readout circuit for reading out the electric charge emitted from the radiation detection element as data;
Control means for controlling at least the scanning drive means and the readout circuit to perform the data readout process;
A communication means for communicating with the outside;
A radiographic imaging device comprising:
A console communicable with the radiographic apparatus,
With
The control means of the radiographic imaging apparatus performs a process of reading offset data that reads offset data for each radiation detection element in a state where no radiation is irradiated, and transmits the read offset data to the console.
The console,
To the signal line your capital before Symbol radiation image capturing apparatus, calculates a statistical value of the offset data,
In case of discrepancies and statistics of the offset data calculated for statistics and other of the signal lines of the offset data calculated for a said signal line is present the signal line exceeds the allowable range, the radiation image capturing A radiographic imaging system characterized by determining that a disconnection has occurred in the apparatus. The console is
As a statistical value of the offset data, a standard deviation or variance of the offset data is calculated for each signal line of the radiographic apparatus,
When the calculated standard deviation or variance of the offset data is compared with the standard deviation or variance of the offset data calculated for the other signal lines, and the signal line is smaller than the allowable range, The radiographic image capturing system according to claim 1, wherein the radiographic image capturing device determines that a disconnection has occurred. The console is
From the standard deviation or variance of the offset data calculated for each signal line of the radiographic imaging device, either the average value or the median value and the minimum value, respectively,
The signal in which the ratio of the standard deviation or variance of the offset data for each signal line to the average value or median of the standard deviation or variance of the offset data for each signal line is less than a set threshold value. The radiographic image capturing system according to claim 2, wherein when there is a line, it is determined that a disconnection has occurred in the radiographic image capturing apparatus.   When calculating the standard deviation or variance of the offset data for each signal line of the radiographic imaging apparatus, the console divides the signal line into a plurality of sections, and the standard deviation or offset data of the offset data for each section. The variance is calculated, and the calculated standard deviation or average or median of the offset data for each of the categories is calculated as the standard deviation or variance of the offset data of the signal line. Or the radiographic imaging system of Claim 3. The console is
And the offset data for each of the radiation detection elements, those wherein in the state in which radiation is not irradiated by the radiation image capturing apparatus, the second offset data of each of the radiation detection element is read in a different reading process and the offset data Difference for each of the radiation detection elements,
The radiation according to any one of claims 2 to 4, wherein, instead of the offset data, it is determined whether or not a disconnection has occurred in the radiographic imaging apparatus with respect to the difference. Image shooting system. A plurality of scanning lines and a plurality of signal lines;
A plurality of radiation detection elements arranged two-dimensionally;
Scanning drive means for switching a voltage applied to each scanning line between an on-voltage and an off-voltage,
A switch that is connected to each scanning line and accumulates charges in the radiation detection element when an off voltage is applied, and discharges the charges accumulated in the radiation detection element to the signal line when an on voltage is applied. Elements,
A readout circuit for reading out the electric charge emitted from the radiation detection element as data;
Control means for controlling at least the scanning drive means and the readout circuit to perform the data readout process;
A communication means for communicating with the outside;
A radiographic imaging device comprising:
A console communicable with the radiographic apparatus,
With
The control means of the radiographic imaging apparatus performs a process of reading offset data that reads offset data for each radiation detection element in a state where no radiation is irradiated, and transmits the read offset data to the console.
The console is
Wherein calculating the standard deviation or variance of the offset data for each of the scanning lines of the previous SL radiographic image capturing apparatus,
When the calculated standard deviation or variance of the offset data is compared with the standard deviation or variance of the offset data calculated for the other scanning lines, the radiographic image is present when the scanning line exceeds an allowable range. ray imaging system release shall be the determining means determines that the disconnection by the photographing device has occurred. A plurality of scanning lines and a plurality of signal lines;
A plurality of radiation detection elements arranged two-dimensionally;
Scanning drive means for switching a voltage applied to each scanning line between an on-voltage and an off-voltage,
A switch that is connected to each scanning line and accumulates charges in the radiation detection element when an off voltage is applied, and discharges the charges accumulated in the radiation detection element to the signal line when an on voltage is applied. Elements,
A readout circuit for reading out the electric charge emitted from the radiation detection element as data;
Control means for controlling at least the scanning drive means and the readout circuit to perform the data readout process;
A communication means for communicating with the outside;
A radiographic imaging device comprising:
A console communicable with the radiographic apparatus,
With
The control means of the radiographic imaging apparatus performs a process of reading offset data that reads offset data for each radiation detection element in a state where no radiation is irradiated, and transmits the read offset data to the console.
The console is
For each scanning line of the radiographic imaging device, calculate an average value or median value of the offset data,
The minimum value or the maximum value among the average value or median value of the offset data calculated for each scanning line of the radiographic imaging device, and the average value or the average value of the offset data for each scanning line, or Extract the median and
The difference between the average value or median value of the offset data for each scanning line and the average value or median value of the offset data for each scanning line is less than a set threshold value. When the scanning line exists, or the average value or median maximum value of the offset data for each scanning line with respect to the average value or median value or the median value of the offset data for each scanning line the difference is, when there are the scanning lines exceeding the set threshold, ray imaging system release shall be the determining means determines that the disconnection in the radiographic image capturing apparatus has occurred. A plurality of scanning lines and a plurality of signal lines;
A plurality of radiation detection elements arranged two-dimensionally;
Scanning drive means for switching a voltage applied to each scanning line between an on-voltage and an off-voltage,
A switch that is connected to each scanning line and accumulates charges in the radiation detection element when an off voltage is applied, and discharges the charges accumulated in the radiation detection element to the signal line when an on voltage is applied. Elements,
A readout circuit for reading out the electric charge emitted from the radiation detection element as data;
Control means for controlling at least the scanning drive means and the readout circuit to perform the data readout process;
A communication means for communicating with the outside;
A radiographic imaging device comprising:
A console communicable with the radiographic apparatus,
With
The control means of the radiographic imaging apparatus performs a process of reading offset data that reads offset data for each radiation detection element in a state where no radiation is irradiated, and transmits the read offset data to the console.
The console is
For each scanning line of the radiographic imaging device, calculate an average value or median value of the offset data,
A difference between an average value or median value of the offset data calculated for a certain scanning line and a moving average of the offset data average value or median value calculated for the scanning line within a predetermined range from the scanning line is calculated. And
Absolute value of the calculated the difference is, when there are the scanning lines exceeding the set threshold, ray imaging system release shall be the determining means determines that the disconnection in the radiographic image capturing apparatus has occurred. The console is
The offset data for each of the radiation detection elements, and second offset data for each of the radiation detection elements read in a state in which radiation is not irradiated by the radiation imaging apparatus before disconnection occurs in the radiation imaging apparatus. For each of the radiation detection elements,
The radiation according to any one of claims 6 to 8, wherein it is determined whether or not a disconnection has occurred in the radiographic imaging apparatus, with respect to the difference instead of the offset data. Image shooting system.   The console may include a plurality of the signals of the radiographic imaging apparatus instead of the statistical value of the offset data calculated for each of the signal lines of the radiographic imaging apparatus or for each of the scanning lines. 2. The apparatus according to claim 1, wherein a determination is made as to whether or not a disconnection has occurred in the radiographic imaging apparatus, with respect to a statistical value of the offset data calculated for each line or each of the plurality of scanning lines. Item 10. The radiographic image capturing system according to any one of Items 9. The radiographic imaging device includes an impact detection means for detecting an impact,
The said control means of the said radiographic imaging apparatus starts the read-out process of the said offset data, when the said impact detection means detects an impact, The any one of Claims 1-10 characterized by the above-mentioned. The radiographic imaging system described.   When the console determines that a disconnection has occurred in the radiographic imaging device, the console itself notifies that there is a possibility that a disconnection has occurred in the radiographic imaging device, and / or the radiation is detected by an external notification means. The radiographic image capturing system according to any one of claims 1 to 11, wherein the image capturing device is notified of the possibility of disconnection. A plurality of scanning lines and a plurality of signal lines;
A plurality of radiation detection elements arranged two-dimensionally;
Scanning drive means for switching a voltage applied to each scanning line between an on-voltage and an off-voltage,
A switch that is connected to each scanning line and accumulates charges in the radiation detection element when an off voltage is applied, and discharges the charges accumulated in the radiation detection element to the signal line when an on voltage is applied. Elements,
A readout circuit for reading out the electric charge emitted from the radiation detection element as data;
Control means for controlling at least the scanning drive means and the readout circuit to perform the data readout process;
With
The control means includes
Perform offset data read processing for reading offset data for each radiation detection element in a state where radiation is not irradiated,
Calculating a statistical value of the offset data to the signal line your capital,
The case where the signal line is present a difference exceeds the allowable range of the statistical value of the offset data calculated for statistics and other of the signal lines of the offset data calculated for a said signal line, disconnection occurs A radiographic imaging device characterized in that it is determined to be present.
  A plurality of scanning lines and a plurality of signal lines;
  A plurality of radiation detection elements arranged two-dimensionally;
  Scanning drive means for switching a voltage applied to each scanning line between an on-voltage and an off-voltage,
  A switch that is connected to each scanning line and accumulates charges in the radiation detection element when an off voltage is applied, and discharges the charges accumulated in the radiation detection element to the signal line when an on voltage is applied. Elements,
  A readout circuit for reading out the electric charge emitted from the radiation detection element as data;
  Control means for controlling at least the scanning drive means and the readout circuit to perform the data readout process;
With
  The control means includes
  Perform offset data read processing for reading offset data for each radiation detection element in a state where radiation is not irradiated,
  Calculating the standard deviation or variance of the offset data for each scan line;
  Disconnection occurs when there is a scan line in which the difference between the standard deviation or variance of the offset data calculated for a certain scan line and the standard deviation or variance of the offset data calculated for another scan line exceeds an allowable range A radiographic imaging device, characterized in that it is determined that an occurrence has occurred. When the control means determines that a disconnection has occurred, the control means causes the radiographic imaging apparatus and / or an external notification means to notify that there is a possibility that a disconnection has occurred in the radiographic imaging apparatus. The radiographic imaging apparatus according to claim 13 or 14 , characterized in that: