JP6412208B2 - Radiation image capturing apparatus, radiation image capturing system, radiation image capturing program, and radiation image capturing method - Google Patents

Description

  The present invention relates to a radiographic image capturing apparatus, a radiographic image capturing system, a radiographic image capturing program, and a radiographic image capturing method, and more particularly to a radiographic image capturing apparatus that captures a radiographic image without synchronizing with the radiation irradiation operation of the radiation generating apparatus. The present invention relates to a radiation image capturing system, a radiation image capturing program, and a radiation image capturing method.

  Conventionally, a radiographic imaging system that performs radiography for the purpose of medical diagnosis is known. The radiographic imaging system includes a radiation generating apparatus that generates radiation, a radiographic imaging apparatus that detects radiation transmitted through the subject and captures a radiographic image, a radiation detector such as a cassette, and the radiation generation There is a radiographic imaging system including a device and a control device that controls the radiation detector.

  In such a radiation detector, image analysis of the captured radiographic image is performed, it is determined whether the subject image is properly detected, and the determination result is output to the external device, so that the user can determine whether the imaging is good or bad. There is a technology to inform (see Patent Documents 1 to 3).

JP 2006-122115 A JP 2006-42967 A JP 2006-81735 A

  By the way, there is a radiographic image capturing system including a radiation detector that captures a radiographic image without receiving an instruction from a control device and without synchronizing with an irradiation operation in which the radiation generating device emits radiation. In such a radiographic image capturing system, there is a case where radiation is detected, a radiographic image is captured and output to a control device or the like, although the radiographic image need not be captured.

  For example, in a radiographic imaging system including a plurality of radiation detectors such as a radiation detector for imaging in a standing position and a radiation detector for imaging in a supine position, without being connected to a control device or a radiation generator, In order to perform radiation imaging on the radiation detector side, not only the radiation detector that should capture the radiation image, but also the radiation detection that does not require capturing the radiation image due to the irradiation. In some cases, the instrument also performs an imaging operation and captures an erroneous radiation image (detects radiation erroneously). In such a case, if the radiographic images taken by each of the plurality of radiation detectors are sequentially output to the control device, there arises a problem that the above-described erroneous radiographic image is also output to the control device.

  In view of such a problem, the present invention can prevent a radiographic image apparatus that captures a radiographic image from outputting an incorrect radiographic image that is not regular. An object is to provide a system, a radiographic imaging program, and a radiographic imaging method.

In order to achieve the above object, a radiographic image capturing device of the present disclosure is a radiographic image capturing device that captures a radiographic image corresponding to radiation irradiated from a radiation irradiating device. The imaging timing detected based on the radiation amount detected by the detection unit based on the radiation amount detected by the detection unit and the detection unit detecting the radiation dose when performing radiographic image capture according to A plurality of radiation detectors each including a determination unit that determines whether or not the radiographic image captured by the imaging device is a regular image, and the plurality of radiation detectors have an imaging surface on which the radiation is irradiated. Are arranged side by side in the direction along.
In addition, the determination unit of the radiographic imaging device according to the present disclosure is configured so that the radiation dose detected by the detection unit is greater than or equal to a predetermined threshold and the radiation dose detected after the detection unit starts detecting the radiation dose. May be determined to be a regular image when the time until reaches a predetermined threshold is less than or equal to a predetermined time.

In addition, the determination unit of the radiographic imaging device of the present disclosure may determine that the radiographic image is not a regular image when the radiation dose detected by the detection unit is less than a predetermined threshold .

In addition, the determination unit of the radiographic imaging device of the present disclosure may be configured such that the time from when the detection unit starts detecting the radiation dose until the detected radiation dose reaches a predetermined threshold exceeds a predetermined time. May determine that the radiation image is not a regular image .

  In addition, when the determination unit of the radiographic imaging device according to the present disclosure determines that the radiographic image is an irregular image, the determination unit may output information indicating that the radiographic image is an irregular image to the outside. .
  Moreover, the radiographic imaging device of this indication may further be provided with the control part which performs control which discards the radiographic image judged as the non-regular image by the judgment part.
  In addition, when the radiographic image is discarded, the control unit of the radiographic image capturing apparatus of the present disclosure may perform control to store information indicating that an irregular image is captured in the storage unit.
  In addition, the determination unit of the radiographic imaging device of the present disclosure determines whether or not the radiographic image is a regular image based on the radiation dose detected by the detection unit when acquiring a correction image for correcting the radiographic image. May be judged.

In order to achieve the above object, the radiographic imaging device of the present disclosure includes a detection unit that detects the amount of irradiated radiation and a detection unit when capturing a radiographic image according to the irradiated radiation. Based on the detected radiation dose, a determination unit that determines whether or not the radiographic image capturing timing is erroneous detection, an image acquisition unit that acquires the radiographic image, a storage unit that stores the radiographic image, and a determination unit A plurality of radiation detectors each having a control unit that performs control to store the radiographic image acquired by the image acquisition unit in the storage unit when it is determined that the detection is not erroneous detection, Imaging planes irradiated with radiation are arranged side by side in a direction along the subject.

In addition, the determination unit of the radiographic imaging device according to the present disclosure may be configured such that the radiation dose detected by the detection unit reaches a predetermined threshold value within a specified time after the detection unit starts detecting the radiation dose. May be determined not to be a false detection.

In addition, the determination unit of the radiographic imaging device according to the present disclosure is configured so that the radiation dose detected by the detection unit is less than a predetermined threshold, and within a specified time after the detection unit starts detecting the radiation dose. If at least one of the cases where the predetermined threshold is not reached, it is determined that it is a false detection, and if the determination unit determines that it is a false detection, information indicating the determination result of the determination unit May be stored in the storage unit.

Further, in the radiographic imaging device of the present disclosure, when the determination unit determines that there is a false detection, the control unit may perform control to discard the radiographic image acquired by the image acquisition unit.
  In addition, in the radiographic imaging device of the present disclosure, when the determination unit determines that there is a false detection, the control unit may output information representing the determination result of the determination unit to the outside.
  In the radiographic image capturing device of the present disclosure, the determination unit may determine whether or not the detection is erroneous based on the radiation dose detected by the detection unit when capturing a radiographic image of the subject.
  Further, the determination unit of the radiographic imaging device of the present disclosure may determine whether or not it is a false detection based on the radiation dose detected by the detection unit when acquiring the offset image data.

In order to achieve the above object, a radiographic image capturing device of the present disclosure is a radiographic image capturing device that captures a radiographic image according to radiation irradiated from the radiation irradiating device, and is irradiated from the radiation irradiating device. When capturing a radiographic image according to radiation, an image for acquiring a radiographic image captured at a detection unit that detects the amount of irradiated radiation and an imaging timing detected based on the radiation amount detected by the detection unit The radiographic image acquired by the image acquisition unit is discarded when it is determined that the imaging timing of the radiographic image is erroneously detected based on the acquisition unit, the storage unit that stores the radiographic image, and the radiation dose detected by the detection unit A plurality of radiation detectors each having a control unit and a control unit that performs control of at least one of the control and the control to be stored together with the information indicating the erroneous detection in the storage unit. , A plurality of radiation detectors, imaging surface of the radiation is emitted are arranged in the direction along the subject.

In addition, the control unit of the radiographic imaging device of the present disclosure may be configured such that the radiation dose detected by the detection unit reaches a predetermined threshold value within a specified time after the detection unit starts detecting the radiation dose. Does not have to be determined as a false detection.

In addition, the control unit of the radiographic imaging device of the present disclosure is configured so that the radiation dose detected by the detection unit is less than a predetermined threshold, and within a specified time after the detection unit starts detecting the radiation dose. In at least one of cases where the predetermined threshold value is not reached, it may be determined that a false detection has occurred.
  In addition, when the control unit of the radiographic imaging device of the present disclosure determines that a detection error has occurred, information indicating the determination result may be output to the outside.
  Further, the control unit of the radiographic imaging device of the present disclosure may determine whether or not an erroneous detection is performed based on the radiation dose detected by the detection unit when capturing a radiographic image of the subject.
  In addition, the control unit of the radiographic imaging device of the present disclosure may determine whether or not a detection error has occurred based on the radiation dose detected by the detection unit when acquiring offset image data.

  In order to achieve the above object, a radiographic image capturing system of the present disclosure includes a control device that instructs setting related to radiographic image capturing, a radiation irradiation device that irradiates radiation based on an instruction from the control device, A radiographic imaging device of the present disclosure that captures a radiographic image corresponding to the radiation emitted from the radiation irradiating device without synchronizing with the radiation irradiation operation by the device, and outputs the captured radiographic image to the control device. Prepare.

In order to achieve the above object, a radiographic imaging method of the present disclosure is a radiographic imaging method in each of a plurality of radiation detectors included in the radiographic imaging device of the present disclosure, and the radiation irradiated by the detection unit A step of detecting the amount, and a step of determining whether or not the radiation image is a regular image based on the radiation amount detected by the detection unit by the determination unit.

In order to achieve the above object, a radiographic imaging method of the present disclosure is a radiographic imaging method in each of a plurality of radiation detectors included in the radiographic imaging device of the present disclosure, and the radiation irradiated by the detection unit A step of detecting the amount, a step of determining whether or not the imaging timing of the radiographic image is a false detection based on the radiation amount detected by the detection unit by the determination unit, and a radiographic image by the image acquisition unit And a step of performing control to store the radiographic image acquired by the image acquisition unit in the storage unit when the determination unit determines that the detection unit is not erroneously detected by the control unit.
  Further, in order to achieve the above object, there is provided a radiographic image capturing method in each of a plurality of radiation detectors included in the radiographic image capturing apparatus of the present disclosure, wherein a detection unit detects a radiation dose irradiated; A step of acquiring a radiographic image captured at an imaging timing detected based on the radiation dose detected by the detection unit by the image acquisition unit, and a radiographic image based on the radiation dose detected by the detection unit by the control unit. When it is determined that the imaging timing has been erroneously detected, at least one of the control of discarding the radiographic image acquired by the image acquisition unit and the control of storing together with the information indicating the erroneous detection in the storage unit, and Is provided.

  As described above, there is an effect that it is possible to prevent an incorrect radiological image from being output from a radiographic image capturing apparatus that captures a radiographic image.

It is a top view which shows an example of a structure of the radiographic imaging system which concerns on this Embodiment. It is a schematic block diagram which shows an example of schematic structure of the radiographic imaging system which concerns on this Embodiment shown in FIG. It is a functional block diagram which shows an example of schematic structure of the radiation detector which concerns on this Embodiment. It is sectional drawing which shows typically an example of a structure of the TFT part of the radiation detector which concerns on this Embodiment. It is sectional drawing which shows typically another example of a structure of the TFT part of the radiation detector which concerns on this Embodiment. It is a flowchart which shows an example of the flow of the erroneous image output suppression process performed in the radiation detector which concerns on this Embodiment.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. 1 and 2 show a schematic configuration of the radiographic image capturing system according to the present embodiment. The radiographic imaging system 10 includes a radiation generator that irradiates a subject 19 with radiation (for example, X-rays (X-rays) and the like), and a radiation detector that detects radiation irradiated from the radiation generator 16 and transmitted through the subject 19. 14 and a control device (console) 12 for instructing radiographing and acquiring image information from the radiation detector 14 and performing various processes. The radiation carrying the image information by passing through the subject 19 irradiated from the radiation generator 16 and located at the imaging position is irradiated to the radiation detector 14.

Note that the radiographic imaging system 10 of the present exemplary embodiment includes a plurality (n in FIG. 2) of radiation detectors 14 (14 _{1 to} 14 _n ) as shown in FIG. In addition, when distinguishing each in the following description, it attaches | subjects and demonstrates the code | symbol (1-n) for distinguishing each after a number, and when referring generically without distinguishing each, code | symbol (1- The description of n) is omitted.

  The control device 12 is wirelessly connected to the radiation detector 14 and has a function of executing various controls on the radiation detector 14 by wireless command / data transmission via the communication I / F 26. The control device 12 is wirelessly connected to the radiation generation device 16 and has a function of controlling the timing of generating radiation (for example, X-ray (X-ray) or the like). The control device 12 includes a CPU (Central Processing Unit) 20, a memory 22, a processing unit 24, a display unit 25, and a communication I / F 26. The CPU 20, the memory 22, the processing unit 24, the display unit 25, and the communication The I / Fs 26 are connected to each other by a bus 28 such as a CPU bus so as to be able to exchange signals with each other. The CPU 20 has a function of controlling the overall operation of the control device 12 by executing various programs stored in the memory 22 in advance. The processing unit 24 has a function of acquiring image data from the radiation detector 14 and performing various processes. The display unit 25 has a function of displaying a radiation image received from the radiation detector 14 via the communication I / F 26.

  The radiation generator 16 includes a radiation source 17 and a communication I / F 18. The radiation generator 16 is wirelessly connected to the control device 12 via the communication I / F 18, and irradiates the subject 19 with radiation from the radiation source 17 at a timing based on the control of the control device 12.

  The radiographic imaging system 10 according to the present exemplary embodiment includes a plurality of radiation detectors 14 as described above. As the radiographic imaging system 10 including the plurality of radiation detectors 14 as described above, a plurality of radiographic imaging systems 10 can be used depending on the imaging application, for example, for standing imaging or for lying imaging, for the front of the subject 19, for the side. Examples include a case where a plurality of radiation detectors 14 are provided along the height direction of the subject 19 for so-called long imaging, but are not limited thereto. It is not limited.

  In FIG. 3, the functional block diagram of an example of the schematic structure of the radiation detector 14 of this Embodiment is shown. The radiation detector 14 of the present embodiment is a radiation detection panel unit, and includes a so-called cassette such as an FPD (Flat Panel Detector).

  The radiation detector 14 includes a TFT (Thin Film Transistor) unit 30, a charge amplifier / MUX (multiplexer) 32, an A / D converter 34, a control unit 36, a gate drive unit 38, a wireless communication unit 40, a timer 42, and a memory. A unit 44 and a power supply unit 48 are provided.

  The TFT unit 30 has a function of detecting the irradiated radiation. FIG. 4 is a cross-sectional view schematically showing an example of the configuration of the TFT unit 30. As shown in FIG. 4, the radiation detector 14 includes a TFT substrate 54 in which a switching element 52 such as a TFT is formed on an insulating substrate 50.

The switch element 52 is connected to a gate line 68 for turning each switch element 52 on and off. A scintillator layer 56 that converts incident radiation into light is formed on the TFT substrate 54. As the scintillator layer 56, for example, CSI: Tl, Gos (Gd ₂ O ₂ S: Tb) phosphor or the like can be used. The scintillator layer 56 is not limited to these materials.

  As the insulating substrate 50, for example, a glass substrate, various ceramic substrates, a resin substrate, or the like can be used, but is not limited to these materials.

  Between the scintillator layer 56 and the TFT substrate 54, a photoconductive layer 58 that generates charges when light converted by the scintillator layer 56 is incident is disposed. A bias electrode 60 for applying a bias voltage to the photoconductive layer 58 is provided on the surface of the photoconductive layer 58 on the scintillator layer 56 side.

  The TFT substrate 54 is provided with a charge collection electrode 62 for collecting charges generated in the photoconductive layer 58. On the TFT substrate 54, the charges collected by the charge collection electrodes 62 are read out by the switch element 52.

  The charge collection electrodes 62 are arranged in a matrix (two-dimensional shape) on the TFT substrate 54, and the switch element TFTs are arranged in a matrix on the insulating substrate 50 correspondingly. A flattening layer 64 for flattening the TFT substrate 54 is formed on the TFT substrate 54. An adhesive layer 66 for bonding the scintillator layer 56 to the TFT substrate 54 is formed between the TFT substrate 54 and the scintillator layer 56 and on the planarizing layer 64.

  The radiation detector 14 may be irradiated with radiation from the front side to which the scintillator layer 56 is bonded (front side is an imaging surface), or irradiated with radiation from the TFT substrate 54 side (back side) (back side is an imaging surface). Good. The radiation detector 14 emits light more strongly on the upper surface side (opposite side of the TFT substrate 54) of the scintillator layer 56 when irradiated from the front side, and passes through the TFT substrate 54 when irradiated with radiation from the back side. Radiation enters the scintillator layer 56, and the TFT substrate 54 side of the scintillator layer 56 emits light more intensely. Electric charges are generated in each photoconductive layer 58 by the light generated in the scintillator layer 56. For this reason, the radiation detector 14 is designed to have higher sensitivity to radiation because radiation does not pass through the TFT substrate 54 when radiation is irradiated from the front side than when radiation is irradiated from the back side. Moreover, since the light emission position of the scintillator layer 56 with respect to each photoconductive layer 58 is closer when the radiation is irradiated from the back side than when the radiation is irradiated from the front side, the radiation image obtained by imaging High resolution.

  The structure of the TFT unit 30 is not limited to this, and is not limited as long as it has a function of accumulating and outputting charges according to the radiation applied to the radiation detector 14, and other structures. May be. An example of another structure of the TFT section 30 is shown in FIG. FIG. 5 is a cross-sectional view schematically showing another example of the configuration of the TFT section 30. The TFT unit 30 shown in FIG. 5 shows a direct conversion type structure in which radiation is directly converted into electric charges and stored in a sensor unit using amorphous selenium or the like.

In the TFT section 30 shown in FIG. 5, a photoconductive layer 59 that converts incident radiation into charges is formed on the TFT substrate 54 as an example of a radiation conversion layer that converts incident radiation. As the photoconductive layer 59, amorphous selenium (a-Se), Bi ₁₂ MO ₂₀ (M: Ti, Si, Ge), Bi ₄ M ₃ O ₁₂ (M: Ti, Si, Ge), Bi ₂ O ₃ , BiMO ₄ (M: Nb, Ta, V), Bi ₂ WO ₆ , Bi ₂₄ B ₂ O ₃₉ , ZnO, ZnS, ZnSe, ZnTe, MNbO ₃ (M: Li, Na, K), PbO, HgI ₂ , PbI ₂ , compounds such as CdS, CdSe, CdTe, BiI ₃ , GaAs, etc. are used, but they have high dark resistance, show good photoconductivity against radiation, and are vacuum-deposited. An amorphous material capable of forming a large area film at a low temperature by the method is preferable.

  On the photoconductive layer 59, a bias electrode 61 that is formed on the surface side of the photoconductive layer 59 and for applying a bias voltage to the photoconductive layer 59 is formed.

  In the direct conversion type TFT unit 30, as in the indirect conversion type TFT unit 30 (see FIG. 4 described above), a charge collection electrode 62 that collects charges generated in the photoconductive layer 59 is formed on the TFT substrate 54. ing.

  In addition, the TFT substrate 54 in the direct conversion type TFT unit 30 includes a charge storage capacitor 63 that stores charges collected by the charge collection electrodes 62. The charge accumulated in each charge storage capacitor 63 is read by the switch element 52.

  The electric charges read out in the TFT section 30 are output to the charge amplifier / MUX 32 as an electric signal. The charge amplifier 32 has a function of amplifying an electrical signal and converting it into an analog voltage as electrical information. As a specific example, the charge amplifier 32 includes an amplifier circuit and a sample hold circuit using an operational amplifier and a capacitor. Yes. The electric signal held in the sample-and-hold circuit is configured to perform parallel-serial conversion by the MUX 32 and output to the A / D converter 34.

  The A / D converter 34 has a function of converting a serially input analog voltage into a digital signal that is easier to handle. The two-dimensional image data of the radiation image converted into a digital signal by the A / D converter 34 is output to the control unit 36. In the present embodiment, the A / D converter 34 is connected to an image memory (not shown), and the transmitted image data is stored in the image memory in order. In this embodiment, the image memory has a storage capacity capable of storing a predetermined number of image data, and each time a radiographic image is captured, the image data obtained by the imaging is sequentially stored in the image memory. It is configured to be.

  The control unit 36 is configured by a microcomputer, and includes a CPU 36A, a memory 36B including a ROM and a RAM, a non-volatile storage unit 36C including a flash memory, and the like. Various programs stored in the memory 36B are stored in the CPU 36A. This has the function of controlling the overall operation of the radiation detector 14. In the present embodiment, the control unit 36 determines whether or not the radiographic image captured in accordance with the radiation dose that is exposed is a regular image, and is not a regular image (an incorrect image). The case has a function of controlling the wireless communication unit 40 so as not to output the radiation image to the control device 12 (details will be described later).

  The image data is further transmitted to the wireless communication unit 40. The wireless communication unit 40 has a function of wirelessly transmitting image data for each line. As described above, the wireless communication unit 40 according to the present embodiment has a function of performing wireless communication with an external device (in this case, the control device 12). IEEE (Institut of Electrical and Electronics Engineers) 802.11a / b / It is compatible with wireless LAN standards such as g / n, and controls the transmission of various information to and from external devices by wireless communication.

  Further, through the wireless communication unit 40, the control unit 36 can wirelessly communicate with an external device that controls the entire radiographic imaging such as the control device 12, and various information can be communicated with the control device 12. Transmission and reception are possible. When capturing a radiographic image of the subject 19, the control unit 36 stores various information such as an imaging condition (imaging menu) received from the control device 12 via the wireless communication unit 40 and information on the subject 19. The charge is read based on the shooting menu.

  The timer 42 has a function of counting the charge accumulation time of the TFT unit 30, the time until the radiation exposure amount exceeds the threshold (details will be described later), and the like.

  Thus, in the radiation detector 14 of this Embodiment, the radiographic image according to the irradiated radiation is image | photographed. Note that the radiographic image capturing operation by the radiation detector 14 according to the present embodiment is performed without receiving a radiographic image capturing instruction from the control device 12 and without being synchronized with the radiation irradiation by the radiation generating device 16 ( Details will be described later).

  In addition, the radiation detector 14 of the present embodiment is provided with a power supply unit 48, and the above-described units and the like are operated by the power supplied from the power supply unit 48. The power supply unit 48 incorporates a battery (a rechargeable secondary battery) so as not to impair the portability of the radiation detector 14, and supplies power from the charged battery to each unit. In FIG. 3, in order to prevent the drawing from being complicated, wiring for connecting the power supply unit 48 and each unit is omitted.

  Next, in the radiation detector 14 of the present embodiment, it is determined whether or not the radiographic image captured according to the radiation dose that is exposed is a regular image, and is not a regular image (an incorrect image). ), A process for controlling the wireless communication unit 40 so as not to output the radiation image (hereinafter referred to as an erroneous image output suppression process) will be described in detail with reference to the drawings. FIG. 6 is a flowchart illustrating an example of the flow of erroneous image output suppression processing executed in the radiation detector 14. When the erroneous image output suppression process is performed, in the control unit 36, a program stored in advance in a predetermined area of the memory 36B is executed by the CPU 36A.

  In step 100, the process proceeds to a radiation detection mode (radiation image capturing mode). In the radiation detector 14 according to the present embodiment, when a predetermined detection start condition is satisfied, the control unit 36 shifts to a radiation detection mode in which the exposed radiation is detected. Examples of such a predetermined detection start condition include, but are not particularly limited to, a case where a shooting menu is registered and a case where power is turned on by the power supply unit 48.

  In the next step 102, detection of the radiation dose that has been exposed is started. In the radiation detector 14 of the present embodiment, the radiation dose exposed by the QL value (reading value of the radiation image information) is detected. However, the present invention is not limited to this. For example, it is detected by the charge accumulation amount of the TFT unit 30. You may comprise as follows.

  In the next step 104, an offset image acquisition process is executed. In the radiation detector 14 of the present embodiment, noise (offset component) such as dark current is superimposed on image data of a radiographic image obtained by imaging the subject 19 (hereinafter referred to as subject image data). In order to remove these from the subject image data, an offset image acquisition process for acquiring image data for correcting the subject image data (hereinafter referred to as offset image data) is performed before the subject 19 is imaged. . In the offset image acquisition process, after performing a reset operation for discharging the charge accumulated in the TFT unit 30 at this time, photographing is performed in a predetermined period (for example, a charge accumulation period instructed by the control device 12). Get offset image data. The offset image data acquired by the offset image acquisition process is output to the control device 12 and stored in the storage unit 44.

  In the next step 106, it is determined whether or not the radiation dose detected during the offset image acquisition process is greater than or equal to a predetermined threshold value. The radiation dose may be a radiation dose detected by a predetermined unit pixel, a radiation dose detected by a plurality of pixels, or an average value of the radiation dose.

  In the radiographic image capturing system 10 of the present embodiment, the radiation amount detected by the radiation detector 14 when capturing a normal radiographic image, particularly in the present embodiment, is detected during the offset image acquisition process (exposure). The range of radiation dose is obtained in advance. Therefore, when the detected radiation dose is not within the range of the radiation dose, a normal radiation image is not captured. In the present embodiment, the lower limit value of the radiation dose range is set in advance as a threshold value, and when the detected radiation dose is less than the threshold value, it is determined that a normal radiographic image is not captured (false detection). I am doing so. The setting of the threshold value is not limited to this, and for example, both the upper limit value and the lower limit value of the above-described radiation dose range may be set as the threshold value. If the detected radiation dose is less than the threshold value, the determination is negative and the process proceeds to step 110. On the other hand, if it is equal to or greater than the threshold value, the determination is affirmative and the routine proceeds to step 108.

  In step 108, the arrival time from when the detection of the radiation dose is started until the detected radiation dose reaches the threshold is acquired from the timer 42, and it is determined whether or not the arrival time is equal to or less than a predetermined time. . In the radiographic imaging system 10, the arrival time until the radiation dose detected by the radiation detector 14 reaches the above threshold is obtained in advance when a regular radiographic image is captured. Therefore, even when the detected radiation dose exceeds the threshold value, if the arrival time is exceeded, a case where a normal radiation image is not captured is shown. Therefore, in the radiation detector 14 of the present embodiment, the timer 42 counts the arrival time from when the radiation dose detection starts until the detected radiation dose reaches the threshold value.

  If the arrival time exceeds the predetermined time, the determination is negative and the process proceeds to step 110. In step 110, the radiographic image obtained by the imaging processing described later is an irregular image, and it is determined that the radiation detector 14 has made a false detection. After that is stored in 36C of the control unit 36, step 110 is performed. Proceed to 114.

  On the other hand, if it is less than the predetermined time in step 108, the determination is affirmative and the routine proceeds to step 112. In step 112, it is determined that the radiographic image obtained by the imaging process described later is a regular image, and this is stored in 36C of the control unit 36, and then the process proceeds to step 114.

  In the radiation image capturing system 10 of the present embodiment, the radiation detector 14 captures a radiation image without synchronizing with the radiation irradiation operation of the radiation generator 16. As a method for performing imaging in this way, a condition for starting charge accumulation in the TFT unit 30 is determined in advance, and a method for performing imaging (charge accumulation) by determining the imaging timing triggered by the establishment of the condition. The charge accumulated in a predetermined pixel or a dedicated pixel is read out, and when the value of the read charge exceeds a predetermined threshold, it is determined that the shooting timing is taken, and a method of shooting is given. There is no particular limitation. In any of the methods, it is preferable to perform a reset operation for resetting the charge accumulated so far just before the start of charge accumulation for radiographic imaging. Therefore, in step 114, a reset operation is performed.

  In the next step 116, a radiographic image is captured by the radiographic image capturing process for capturing a radiographic image corresponding to the irradiated radiation as described above, and subject image data is acquired.

  In the next step 118, it is determined with reference to the storage unit 36C whether or not the captured radiographic image is a regular image. If the image is a regular image, the process proceeds to step 120, and the subject image data acquired by the wireless communication unit 40 is output to the control device 12, and then this process ends. On the other hand, if the image is not a regular image, the subject image data is not output to the control device 12 and the process is terminated. As a method for controlling the subject image data so as not to be output to the control device 12, for example, the subject image data may be transmitted to the wireless communication unit 40 only when it is determined as a regular image. The subject image data is transmitted to the wireless communication unit 40 regardless of whether it is normal or not. When the image data is not normal, it is instructed not to output the subject image data transmitted to the wireless communication unit 40. May be.

  Note that the subject image data determined to be an irregular image may be discarded or stored in the storage unit 44 together with the irregularity. In addition, when the subject image data is discarded, the storage unit 44 may store information indicating that an irregular image has been captured.

  In the present embodiment, when it is determined that the image is an irregular image, the wireless communication unit 40 does not output anything to the control device 12 but outputs to the control device 12 that an unauthorized image has been captured. You may make it do.

  As described above, the radiation detector 14 of the radiographic imaging system 10 according to the present exemplary embodiment obtains radiation when acquiring offset image data without synchronizing with the radiation irradiation operation of the radiation generator 16. When the radiation dose exposed by the radiation emitted from the generator 16 is detected, and the detected radiation dose is less than the threshold, and even if the detected radiation dose is greater than or equal to the threshold, the time until the threshold is reached When the arrival time exceeds the predetermined time, the control unit 36 determines that the captured radiographic image is not a regular image, and does not output the radiographic image (subject image data) to the control device 12. 40 is controlled.

  In addition, when the detected radiation dose is equal to or greater than the threshold and the arrival time until the threshold is reached is equal to or less than the predetermined time, the control unit 36 determines that the captured radiographic image is a regular image. The radio communication unit 40 is instructed to output the radiation image (subject image data) to the control device 12.

  As described above, the radiation detector 14 according to the present embodiment can prevent an erroneous radiation image that is not regular from being output.

In the radiographic imaging system 10 of the present exemplary embodiment, when at least one of a plurality of radiation detectors 14 (14 _{1 to} 14 _n ) captures a radiographic image of the subject 19, all the radiations that have detected the radiation are detected. Since the above-described erroneous image output suppression processing is executed in the detector 14, even when there is an erroneously detected radiation detector 14, no radiation image is output from the radiation detector 14 to the control device 12. In this way, since the radiation detector 14 can determine whether the radiation image is a regular radiation image, and no erroneous radiation image is output, the control device 12 receives only the regular radiation image.

  Therefore, in the radiographic image capturing system 10, the workflow processing time from the start of radiographic image capture to the completion of normal image output (reception completed by the control device 12) is shortened, and convenience is improved. Moreover, since the control apparatus 12 receives only a regular image, it can prevent that the image display speed in the control apparatus 12 becomes slow.

  In addition, even in the radiographic imaging system 10 including a plurality of radiation detectors 14 as described above, it is not necessary to select and specify the radiation detector 14 that captures a radiographic image in advance, and a normal radiographic image is acquired. Therefore, there is no worry of an error in selecting / designating the radiation detector 14. Therefore, re-imaging due to an error can be prevented, and the subject 19 can be prevented from being wasted.

  Further, since the radiation detector 14 according to the present embodiment determines whether or not the radiation image is normal based on the detected radiation dose, the determination is performed by performing image analysis as in the conventional technique. Processing can be performed faster than it can.

  In the present embodiment, it is determined whether or not the captured radiographic image is a regular image based on the radiation dose detected during the offset image acquisition process for acquiring the offset image data. Not limited to this, it may be determined whether the image is a regular image based on the radiation dose detected during the radiographic imaging process for acquiring the subject image data.

  In the present embodiment, the radiographic image capturing process is performed after determining whether or not the radiographic image is a regular image based on the radiation dose detected in the offset image acquiring process for acquiring the offset image data. However, the present invention is not limited to this, and if it is determined that the image is not a regular image, the shooting process may not be performed.

  Moreover, although the radiographic imaging system 10 of this Embodiment is comprised so that the several radiation detector 14 may be provided, it is not restricted to this, You may be comprised so that one radiation detector 14 may be provided. . Even in such a case, it is possible to prevent the captured radiographic image from being output to the control device 12 when the subject 19 cannot be properly imaged. Therefore, for example, user convenience is improved.

  In addition, the configuration of the radiographic imaging system 10, the control device 12, the radiation detector 14, and the radiation generation device 16 described in the present embodiment is an example, and the situation is within the scope of the present invention. Needless to say, it can be changed accordingly.

    An example of the flow of erroneous image output suppression processing described in this embodiment (FIG. 6) is also an example, and it goes without saying that it can be changed depending on the situation without departing from the gist of the present invention.

  In this embodiment, the case where X-rays are applied as the radiation of the present invention has been described. However, the present invention is not limited to this, and γ-rays or the like may be applied.

DESCRIPTION OF SYMBOLS 10 Radiographic imaging system 12 Control apparatus 14 Radiation detector 16 Radiation generation apparatus 30 TFT part 36 Control part 36C Storage part 40 Wireless communication part 44 Storage part 48 Power supply part

Claims (25)

A radiographic imaging apparatus that captures a radiographic image corresponding to radiation irradiated from a radiation irradiating apparatus,
When capturing a radiographic image corresponding to the radiation irradiated from the radiation irradiation device, a detection unit that detects the amount of radiation irradiated,
Based on the radiation dose detected by the detection unit, it is determined whether or not the radiographic image captured at the imaging timing detected based on the radiation dose detected by the detection unit is a regular image. A determination unit;
A plurality of radiation detectors each having
The plurality of radiation detectors are arranged side by side in the direction along the subject, the imaging surface irradiated with radiation,
Radiation imaging device. The determination unit is configured such that the radiation dose detected by the detection unit is equal to or greater than a predetermined threshold, and the radiation dose detected after the detection unit starts detecting the radiation dose is the predetermined dose. Determining that the radiographic image is a regular image when the time to reach a given threshold is less than or equal to a predetermined time;
The radiographic imaging device according to claim 1. The determination unit determines that the radiation image is not a regular image when the radiation dose detected by the detection unit is less than the predetermined threshold value.
The radiographic imaging apparatus according to claim 2. The determination unit, when the time until the detected radiation dose reaches the predetermined threshold after the detection unit starts detecting the radiation dose exceeds the predetermined time, Determine that the image is not legitimate,
The radiographic imaging apparatus of Claim 2 or Claim 3. When the determination unit determines that the radiographic image is an irregular image, it outputs information indicating that the radiographic image is an irregular image to the outside.
The radiographic imaging apparatus of Claim 3 or Claim 4. The radiographic image capturing apparatus according to any one of claims 3 to 5, further comprising a control unit that performs control to discard the radiographic image determined to be an irregular image by the determination unit. When the radiographic image is discarded, the control unit performs control to store information indicating that a non-regular image is captured in the storage unit,
The radiographic imaging apparatus according to claim 6. The determination unit determines whether the radiation image is a regular image based on the radiation amount detected by the detection unit when acquiring a correction image for correcting the radiation image.
The radiographic imaging apparatus as described in any one of Claims 1-7. A detector that detects the amount of radiation applied when capturing a radiation image corresponding to the radiation applied;
A determination unit that determines whether or not the radiographic image capturing timing is erroneous detection based on the radiation dose detected by the detection unit;
An image acquisition unit for acquiring the radiation image;
A storage unit for storing the radiation image;
A control unit that performs control to store the radiographic image acquired by the image acquisition unit in the storage unit when the determination unit determines that it is not the erroneous detection;
A plurality of radiation detectors each having
The plurality of radiation detectors are arranged side by side in the direction along the subject, the imaging surface irradiated with radiation,
Radiation imaging device. The determination unit detects the false detection when the radiation dose detected by the detection unit reaches a predetermined threshold value within a predetermined time after the detection unit starts detecting the radiation dose. Judge that is not
The radiographic imaging apparatus according to claim 9. The determination unit is predetermined when the radiation dose detected by the detection unit is less than a predetermined threshold, and within a predetermined time after the detection unit starts detecting the radiation dose. If at least one of the cases where the threshold is not reached, it is determined that the detection is false,
When the control unit determines that the determination unit is the erroneous detection, the control unit stores information indicating a determination result of the determination unit in the storage unit.
The radiographic imaging apparatus of Claim 9 or Claim 10. If the determination unit determines that it is the false detection,
The control unit performs control to discard the radiation image acquired by the image acquisition unit.
The radiographic imaging apparatus as described in any one of Claims 9-11. If the determination unit determines that it is the false detection,
The radiographic imaging apparatus according to any one of claims 9 to 12, wherein the control unit outputs information representing a determination result of the determination unit to the outside. The determination unit determines whether the detection error is based on the radiation dose detected by the detection unit when the radiographic image of the subject is captured;
The radiographic imaging device according to any one of claims 9 to 13. The determination unit determines whether or not the detection error is based on the radiation dose detected by the detection unit when acquiring offset image data.
The radiographic imaging apparatus as described in any one of Claims 9-14. A radiographic imaging apparatus that captures a radiographic image corresponding to radiation irradiated from a radiation irradiating apparatus,
When capturing a radiographic image corresponding to the radiation irradiated from the radiation irradiation device, a detection unit that detects the amount of radiation irradiated,
An image acquisition unit for acquiring the radiographic image captured at an imaging timing detected based on the radiation dose detected by the detection unit;
A storage unit for storing the radiation image;
Control that discards the radiographic image acquired by the image acquisition unit when it is determined that the radiographic image capturing timing is erroneously detected based on the radiation dose detected by the detection unit, and an error in the storage unit A control unit that performs control of at least one of the control to be stored together with information indicating that it has been detected;
A plurality of radiation detectors each having
The plurality of radiation detectors are arranged side by side in the direction along the subject, the imaging surface irradiated with radiation,
Radiation imaging device. The control unit misdetects the radiation dose detected by the detection unit when the detection unit reaches a predetermined threshold value within a predetermined time after the detection unit starts detecting the radiation dose. Is not judged,
The radiographic imaging apparatus according to claim 16. The control unit determines the predetermined dose within a specified time after the radiation dose detected by the detection unit is less than a predetermined threshold and when the detection unit starts detecting the radiation dose. If at least one of the cases where the threshold is not reached, it is determined that a false detection has occurred.
The radiographic imaging apparatus of Claim 16 or Claim 17. When the control unit determines that it is erroneously detected, it outputs information representing the determination result to the outside.
The radiographic imaging apparatus as described in any one of Claims 16-18. The control unit determines whether or not an erroneous detection is performed based on the radiation dose detected by the detection unit when the radiographic image of the subject is captured.
The radiographic imaging apparatus as described in any one of Claims 16-19. The control unit determines whether or not an erroneous detection is made based on the radiation dose detected by the detection unit when acquiring offset image data.
The radiographic imaging device according to any one of claims 16 to 20. A control device for instructing settings relating to radiographic imaging;
A radiation irradiating device for irradiating radiation based on an instruction from the control device;
The radiographic image according to the radiation irradiated from the said radiation irradiation apparatus is image | photographed without synchronizing with the radiation irradiation operation | movement by the said radiation irradiation apparatus, and the imaged radiation image is output to the said control apparatus. The radiographic imaging device according to any one of claims 21 to 21,
Radiographic imaging system equipped with. A radiographic image capturing method in each of a plurality of radiation detectors included in the radiographic image capturing apparatus according to claim 1,
A step of detecting the amount of irradiated radiation by the detection unit;
A step of determining whether or not the radiographic image is a regular image based on the radiation dose detected by the detection unit;
A radiographic imaging method comprising: A radiographic imaging method in each of a plurality of radiation detectors included in the radiographic imaging device according to any one of claims 9 to 15,
A step of detecting the amount of irradiated radiation by the detection unit;
A step of determining whether or not the imaging timing of the radiographic image is a false detection based on the radiation dose detected by the detection unit by a determination unit;
Acquiring the radiation image by an image acquisition unit;
When the control unit determines that the determination unit is not the false detection, performing a control to store the radiation image acquired by the image acquisition unit in a storage unit;
A radiographic imaging method comprising: A radiographic imaging method in each of a plurality of radiation detectors included in the radiographic imaging device according to any one of claims 16 to 21,
A step of detecting the amount of irradiated radiation by the detection unit;
A step of acquiring, by an image acquisition unit, the radiographic image captured at an imaging timing detected based on the radiation dose detected by the detection unit;
Control for discarding the radiographic image acquired by the image acquisition unit when the control unit determines that the radiographing timing of the radiographic image is erroneously detected based on the radiation dose detected by the detection unit; and A step of performing control of at least one of the control to be stored together with information indicating that the storage unit has erroneously detected,
A radiographic imaging method comprising: