JP5247386B2 - Portable radiographic imaging device and radiographic imaging system - Google Patents

Description

  The present invention relates to a portable radiographic imaging device and a radiographic imaging system.

  In recent years, a flat panel detector (FPD) has been put into practical use, in which a radiation sensitive layer is arranged on a thin film transistor (TFT) active matrix substrate, and radiation can be directly converted into digital data. It is also referred to as a portable radiographic image capturing apparatus (hereinafter referred to as “electronic cassette”) that generates image information indicating a radiographic image represented by the radiation and stores the generated image information in a predetermined storage area. ) Has been put to practical use.

  By the way, in this type of electronic cassette, an FPD and a reading device that reads image information from the FPD are connected by a flexible substrate. Therefore, when the electronic cassette vibrates, the flexible substrate vibrates inside the electronic cassette and the distance between the flexible substrate and the peripheral member of the flexible substrate changes, and the floating capacitance formed by the flexible substrate and the peripheral member. In some cases, noise is superimposed on the image information being transmitted through the flexible board, and the image quality of the radiation image indicated by the image information is degraded.

Therefore, the technique of Patent Document 1 has been invented to suppress the vibration of the flexible substrate. That is, Patent Document 1 discloses a radiation solid state detector that records the image information by receiving radiation that carries the image information, and outputs an image signal representing the recorded image information by scanning with reading light. A reading light source for irradiating the radiation solid detector with reading light, a signal processing board for processing an image signal output from the radiation solid detector, the radiation solid detector, and the signal processing board. A flexible substrate to be connected; an annular portion; the radiation solid detector is held on an upper surface of the annular portion; the reading light source is accommodated on the inner side of the annular portion; Disclosed is a radiation detection cassette comprising: a base for holding a substrate; and a driving means held on the base and configured to scan and move the reading light source. To have.
JP 2007-155433 A

  However, even with the technique of Patent Document 1, there is a problem that the vibration of the flexible substrate cannot be eliminated at all, and the deterioration of the image quality of the radiation image when the flexible substrate vibrates cannot be avoided.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a portable radiographic image capturing apparatus and a radiographic image capturing system capable of suppressing deterioration in the image quality of a radiographic image.

  In order to achieve the above object, the portable radiographic imaging device according to claim 1 detects radiation that has passed through the subject and converts the radiation into image information indicating a radiation image corresponding to the detected radiation dose. A detection unit; a reading unit that reads image information from the radiation detection unit; a flexible substrate that connects the radiation detection unit and the reading unit; and a threshold value at which a variation amount per unit time of the flexible substrate is determined in advance. And stopping means for stopping reading by the reading means while exceeding.

  According to the portable radiographic image capturing apparatus of claim 1, the radiation that has passed through the subject is detected by the radiation detection means, and is converted into image information indicating a radiation image corresponding to the detected radiation dose, and read. The image information is read from the radiation detection means by the means.

  In the present invention, the radiation detecting means and the reading means are connected by a flexible substrate.

  In the present invention, the reading by the reading unit is stopped while the variation amount per unit time of the flexible substrate exceeds a predetermined threshold by the stop unit.

  As described above, according to the portable radiographic imaging device of the first aspect, reading of the image information is stopped while the amount of fluctuation per unit time of the flexible substrate exceeds the predetermined threshold. The deterioration of the image quality of the radiation image can be suppressed.

In addition, the portable radiographic image capturing device according to claim 1 is configured so as to face the flexible substrate and form a stray capacitance between the flexible substrate and the flexible substrate , as in the invention according to claim 2. It further comprises a measuring means for measuring the amount of change per unit time of the distance to the flexible substrate,
The stopping unit can determine that the amount of change per unit time of the flexible substrate exceeds the threshold value when the amount of change measured by the measuring unit exceeds a predetermined amount of change.

  In addition, the portable radiographic imaging device according to claim 1 further includes measurement means for measuring the magnitude of vibration of the flexible substrate, as in the invention according to claim 3, wherein the stop means It may be determined that the amount of fluctuation per unit time of the flexible substrate exceeds the threshold value when the magnitude of vibration measured by the measuring unit exceeds a predetermined magnitude of vibration. Thereby, it can be easily determined whether or not the amount of fluctuation per unit time of the flexible substrate exceeds a predetermined threshold.

  Moreover, the portable radiographic imaging device according to any one of claims 1 to 3 is configured such that, as in the invention according to claim 4, the amount of variation per unit time of the flexible substrate has the threshold value. A display means may be further included for performing a predetermined display when the exceeding time exceeds a predetermined time. Thereby, the user can easily know that the reading of the image information is stopped.

On the other hand, in order to achieve the above object, a radiographic imaging system according to a fifth aspect includes a portable radiographic imaging device according to any one of the first to fourth aspects, and the portable radiographic image. A display device that performs a predetermined display when a time during which the amount of fluctuation per unit time of the flexible substrate exceeds the threshold exceeds a predetermined time by communicating with an imaging device; , Including.

Therefore, the radiographic image capturing system of the present invention operates in the same manner as the portable radiographic image capturing apparatus according to any one of claims 1 to 4 of the present invention. Similar effects can be obtained. Further, the user can easily know that reading of the image information is stopped by visually recognizing a predetermined display by the communication device.

The radiographic image capturing system according to claim 5 further includes a console that communicates with the portable radiographic image capturing device, as in the invention according to claim 6, wherein the display device When the amount of fluctuation per unit time of the flexible substrate exceeds the threshold exceeds the predetermined time by performing communication with the portable radiographic imaging device via a console It is good also as what performs a predetermined display.
Further, the radiographic image capturing system according to claim 5 is configured such that, as in the invention according to claim 7, the display device communicates with the portable radiographic image capturing device. The console may perform the predetermined display when the amount of fluctuation per unit time exceeds the threshold exceeds the predetermined time.

On the other hand, in order to achieve the above object, the radiographic imaging system according to claim 8 detects radiation that has passed through the subject, and converts the radiation into image information indicating a radiation image corresponding to the detected radiation dose. A portable radiographic imaging device comprising: a detection unit; a reading unit that reads image information from the radiation detection unit; and a flexible substrate that connects the radiation detection unit and the reading unit; and the portable radiographic imaging device The amount of variation per unit time of the flexible substrate is recognized to exceed a predetermined threshold by performing communication with the device, and the amount of variation per unit time of the flexible substrate exceeds the threshold And a communication device that controls equipment related to photographing so that photographing is prohibited.

According to the radiographic imaging system of claim 8 , in the portable radiographic imaging apparatus, the radiation detecting means detects the radiation that has passed through the subject, and displays an image indicating a radiation image corresponding to the detected radiation dose. It is converted into information, and image information is read from the radiation detecting means by the reading means.

  In the portable radiographic image capturing apparatus of the present invention, the radiation detecting means and the reading means are connected by a flexible substrate.

  In the present invention, the communication device recognizes that the amount of fluctuation per unit time of the flexible board exceeds a predetermined threshold, and the amount of fluctuation per unit time of the flexible board exceeds the threshold. During this time, the device related to the photographing is controlled so that the photographing is prohibited.

As described above, according to the portable radiographic imaging device of the present invention , imaging is prohibited while the amount of fluctuation per unit time of the flexible substrate exceeds a predetermined threshold value. The decrease can be suppressed.

  According to the present invention, it is possible to suppress the deterioration of the image quality of the radiation image.

  The best mode for carrying out the present invention will be described below in detail with reference to the drawings.

  [First Embodiment]

  First, the configuration of the radiographic image capturing system 10 (hereinafter also referred to as “imaging system 10”) according to the present embodiment will be described. FIG. 1 shows a state where the imaging system 10 is installed in the operating room as an example of a state where the imaging system 10 according to the present embodiment is arranged.

  The imaging system 10 captures a radiographic image by the operation of a doctor 12 or a radiographer. The imaging system 10 detects an operating table 16 on which the patient 14 is placed, a radiation irradiation device 18 that irradiates the patient 14 with radiation X having a radiation dose according to the imaging conditions, and the radiation X transmitted through the patient 14. An electronic cassette 20 that performs imaging by storing image information indicating a radiation image corresponding to the detected radiation dose in a predetermined storage area, and a display that displays a radiation image obtained by imaging with the electronic cassette 20 The apparatus 22 includes a cradle 24 that charges a battery 50 (see FIG. 3) built in the electronic cassette 20, and a console 26 that controls the radiation irradiation device 18, the electronic cassette 20, and the display device 22. In the imaging system 10 according to the present embodiment, radio communication using radio waves is performed between the radiation irradiation device 18, the electronic cassette 20, the display device 22, and the console 26. The optical wireless communication used may be performed.

  In the operating room shown in FIG. 1, in addition to the imaging system 10, an instrument table 28 on which various instruments used by the doctor 12 for surgery are placed on the side of the operating table 16. In addition, various devices necessary for the operation such as an anesthesia machine, an aspirator, an electrocardiograph, a sphygmomanometer, and the like are arranged around the operating table 16 (these devices are omitted in FIG. 1). .

  The radiation irradiation device 18 is connected to the free arm 30 and can be moved to a desired position according to the imaging region of the patient 14 and can be retracted to a position that does not interfere with the operation by the doctor 12. Similarly, the display device 22 is connected to the free arm 32 and can be moved to a position where the doctor 12 can easily confirm the captured radiographic image.

  FIG. 2 is a schematic cross-sectional view showing the configuration of the electronic cassette 20 according to the first embodiment.

  As shown in the figure, the electronic cassette 20 includes a housing 34 made of a material that transmits the radiation X. The electronic cassette 20 includes a grid 35 that removes scattered radiation of the radiation X by the patient 14 as an irradiation surface of the housing 34 to which the radiation X is irradiated. An imaging device 36 is housed inside the housing 34, and as a member constituting the imaging device 36, the imaging device 36 is formed in a panel shape from the irradiation surface side of the housing 34 to which the radiation X is irradiated. The radiation detector 40 that detects the radiation X transmitted through 14 and holds image information indicating a radiation image corresponding to the detected radiation dose is fixed to the inner wall of the housing 34, and the radiation detector 40 is fixed. The base 42 and the back surface of the base 42 (the back surface of the surface on which the radiation detector 40 is fixed) are read, and the image information held by the radiation detector 40 is read, and the image information is And a circuit board 44 on which an electronic component 44a for performing a predetermined process is mounted. The circuit board 44 is connected to the radiation detector 40 by a flexible board 46. The flexible substrate 46 includes a gate wiring 100 and a data wiring 102 described later for reading image information from the radiation detector 40, and a plurality of flexible substrates 46 are arranged on the outer periphery of the radiation detector 40. Each flexible substrate 46 passes through the side of the base 42 and is routed to the circuit board 44 disposed on the back surface of the base 42. Further, a vibration sensor 48 for measuring the magnitude of vibration of the flexible substrate 46 is attached to each flexible substrate 46.

  FIG. 3 is a block diagram showing a main configuration of the photographing system 10 according to the first embodiment.

  The radiation detector 40 built in the electronic cassette 20 is configured by laminating a photoelectric conversion layer that absorbs radiation X and converts it into charges on a TFT active matrix substrate 90. The photoelectric conversion layer is made of amorphous a-Se (amorphous selenium) containing, for example, selenium as a main component (for example, a content rate of 50% or more), and when irradiated with radiation X, a charge corresponding to the amount of irradiated radiation. By generating a certain amount of charge (electron-hole pairs) internally, the irradiated radiation X is converted into a charge. The radiation detector 40 is indirectly charged using a phosphor material and a photoelectric conversion element (photodiode) instead of the radiation-charge conversion material that directly converts the radiation X such as amorphous selenium into an electric charge. May be converted to As phosphor materials, gadolinium sulfate (GOS) and cesium iodide (CsI) are well known. In this case, radiation X-light conversion is performed using a fluorescent material, and light-charge conversion is performed using a photodiode of a photoelectric conversion element.

  Further, on the TFT active matrix substrate 90, a pixel portion 96 (FIG. 3) provided with a storage capacitor 92 for storing the charge generated in the photoelectric conversion layer and a TFT 94 for reading out the charge stored in the storage capacitor 92. In FIG. 5, photoelectric conversion layers corresponding to the individual pixel portions 96 are schematically shown as photoelectric conversion portions 98.) A large number of photoelectric conversion layers are arranged in a matrix, and the photoelectric cassette 20 is exposed to radiation X irradiated with the radiation X. The electric charge generated in the conversion layer is accumulated in the accumulation capacitor 92 of each pixel unit 96. As a result, the image information carried on the radiation X irradiated to the electronic cassette 20 is converted into charge information and held in the radiation detector 40.

  The TFT active matrix substrate 90 has a plurality of gate wirings 100 extending in a certain direction (row direction) for turning on and off the TFTs 94 of the individual pixel portions 96, and a direction (column direction) orthogonal to the gate wirings 100. A plurality of data wirings 102 are provided for reading out stored charges from the storage capacitor 92 through the TFT 94 extended and turned on. Individual gate lines 100 are connected to a gate line driver 104, and individual data lines 102 are connected to a signal processing unit 110. When charges are stored in the storage capacitors 92 of the individual pixel portions 96, the TFTs 94 of the individual pixel portions 96 are sequentially turned on in units of rows by a signal supplied from the gate line driver 104 via the gate wiring 100. The charge stored in the storage capacitor 92 of the pixel unit 96 for which is turned on is transmitted as a charge signal through the data wiring 102 and input to the signal processing unit 110. Accordingly, the charges accumulated in the storage capacitors 92 of the individual pixel portions 96 are sequentially read out in units of rows.

  FIG. 4 shows an equivalent circuit diagram focusing on one pixel portion of the radiation detector 40 according to the present embodiment.

  As shown in the figure, the source of the TFT 94 is connected to the data line 102, and the data line 102 is connected to the signal processing unit 110. The drain of the TFT 94 is connected to the storage capacitor 92 and the photoelectric conversion unit 98, and the gate of the TFT 94 is connected to the gate wiring 100.

  The signal processing unit 110 includes a sample hold circuit 112 for each data wiring 102. The charge signal transmitted through each data line 102 is held in the sample hold circuit 112. The sample hold circuit 112 includes an operational amplifier 112A and a capacitor 112B, and converts the charge signal into an analog voltage. In addition, the sample hold circuit 112 is provided with a switch 112C as a reset circuit that shorts both electrodes of the capacitor 112B and discharges the charge accumulated in the capacitor 112B.

  A multiplexer 114 and an A / D converter 116 are sequentially connected to the output side of the sample and hold circuit 112, and the charge signals held in the individual sample and hold circuits are converted into analog voltages and sequentially (serially) to the multiplexer 114. ) And is converted into digital image information by the A / D converter 116.

  A line memory 118 is connected to the signal processing unit 110 (see FIG. 3), and image information output from the A / D converter 116 of the signal processing unit 110 is sequentially stored in the line memory 118. The line memory 118 has a storage capacity capable of storing image information indicating a radiation image for a predetermined number of lines, and each time the charge is read out line by line, the read image information for one line is stored in the line memory. 118 are sequentially stored.

  The line memory 118 is connected to a cassette control unit 120 that controls the operation of the entire electronic cassette 20. The cassette control unit 120 is realized by a microcomputer, and a wireless communication control unit 122 is connected thereto. The wireless communication control unit 122 is connected to the antenna 20A, and controls transmission of various kinds of information to and from an external device via the antenna 20A.

  A vibration sensor 48 is connected to the cassette control unit 120. Therefore, the cassette control unit 120 can grasp the magnitude of vibration measured by the vibration sensor 48.

  The cassette control unit 120 is connected to a speaker 121 for performing a predetermined audible display. Therefore, the cassette control unit 120 can control the speaker 121 so that a predetermined audible display is performed.

  Further, the electronic cassette 20 includes a battery 50 that is a rechargeable secondary battery, and includes various circuits and elements (gate line driver 104, signal processing unit 110, line memory 118, wireless communication control unit 122, and the like described above). The microcomputer functioning as the cassette control unit 120 is operated by the electric power supplied from the battery 50.

  On the other hand, the console 26 is configured as a server computer, and includes a display 136 (see also FIG. 1) for displaying an operation menu, a captured radiographic image, and the like, and a plurality of keys. And an operation panel 140 (see also FIG. 1) for inputting operation instructions.

  The console 26 includes a CPU 128 that controls the operation of the entire apparatus, a ROM 130 that stores various programs including a control program in advance, a RAM 132 that temporarily stores various data, and an HDD that stores and holds various data. (Hard disk drive) 134, a display driver 138 that controls display of various types of information on the display 136, an operation input detector 142 that detects an operation state of the operation panel 140, and the antenna 26A. Wireless communication of various information such as exposure conditions and state information of the radiation irradiation device 18 is performed with the radiation irradiation device 18 via the antenna 26B, and is connected to the antenna 26B and between the electronic cassette 20 via the antenna 26B. A wireless communication control unit 144 that performs wireless communication of various types of information such as image information; It is equipped with a.

  The CPU 128, the ROM 130, the RAM 132, the HDD 134, the display driver 138, the operation input detection unit 142, and the wireless communication control unit 144 are connected to each other via the system bus BUS. Therefore, the CPU 128 can access the ROM 130, the RAM 132, and the HDD 134, controls the display of various information on the display 136 via the display driver 138, and controls the user for the operation panel 140 via the operation input detection unit 142. And the control of transmission / reception of various information with the radiation irradiation device 18 and the electronic cassette 20 via the wireless communication control unit 144.

  On the other hand, the radiation irradiation device 18 is connected to the radiation source 152 that outputs the radiation X and the antenna 18A, and various information such as the exposure conditions and the state information of the radiation irradiation device 18 between the console 26 and the antenna 18A. A wireless communication control unit 154 that performs the wireless communication, and a radiation source control unit 156 that controls the radiation source 152 based on the received exposure conditions. The radiation source control unit 156 is also realized by a microcomputer, stores the received exposure conditions, and irradiates the radiation X from the radiation source 152 based on the stored exposure conditions.

  Next, a processing routine of the electronic cassette 20 when the cassette control unit 120 is reading image information held in the radiation detector 40 will be described with reference to FIG. FIG. 5 is a flowchart showing the flow of processing of the electronic cassette control processing program executed by the cassette control unit 120 of the electronic cassette 20 at this time, and the program is a microcomputer that implements the cassette control unit 120. Is stored in advance in a predetermined area of the memory included in the memory.

  In step 200 in the figure, the magnitude of vibration of at least one flexible board 46 is a predetermined magnitude of vibration (as an example, noise is expected to be superimposed on image information being transmitted through the flexible board 46. Wait until it exceeds the vibration level). That is, the fluctuation amount per unit time of at least one flexible board 46 is a predetermined threshold value (for example, a unit of flexible board 46 in which noise is expected to be superimposed on image information being transmitted through flexible board 46. Wait until the fluctuation amount per hour) is exceeded.

  In the next step 202, reading of the image information held by the radiation detector 40 is stopped, and in the next step 203, the time during which the magnitude of vibration of the flexible substrate 46 exceeds a predetermined threshold value. It is determined whether or not a predetermined time (for example, 2 seconds) has elapsed. If the determination is affirmative, the process proceeds to step 204. If the determination is negative, the process of step 204 is not performed and step 206 is performed. Migrate to

  In step 204, the speaker 121 is controlled such that a predetermined audible display is performed. That is, the speaker 121 is controlled so as to output a predetermined sound (for example, a sound “reading of image information is being stopped”) or an alarm sound. In the present embodiment, the audible display is performed using the speaker 121. However, the present invention is not limited to this, and a visual display (not shown) such as an organic EL display or a liquid crystal display (LCD) that is determined in advance is used. Permanently visible display by displaying information indicating that reading of image information has been stopped) or printing on recording paper (Permanently visible display of information indicating that reading of image information has been stopped) May be performed. Alternatively, the above-described predetermined visual display may be performed using the display 136 of the console 26, or a speaker may be installed on the console 26 and the above-described predetermined audible display may be performed using the speaker. Alternatively, a printer may be installed on the console 26 and the predetermined permanent visual display described above may be performed using the printer. Furthermore, in at least one of the electronic cassette 20 and the console 26, a plurality of the visible display, the audible display, and the permanent visible display may be combined.

  In the next step 206, it is determined whether or not the magnitude of vibration of each flexible board 46 is equal to or less than the predetermined magnitude of vibration. If the determination is affirmative, the routine proceeds to step 208.

  In step 208, reading of the image information held by the radiation detector 40 is restarted, and in the next step 209, it is determined whether or not the audible display is performed on the speaker 121, and an affirmative determination is made. If YES, the process proceeds to step 210. If NO is determined, the electronic cassette control process program is terminated without executing the process of step 210.

  In step 210, the electronic cassette control processing program is terminated after controlling the speaker 121 so that the predetermined audible display is stopped.

  As described above in detail, the electronic cassette 20 according to the first embodiment detects the radiation X transmitted through the patient 14 and converts the radiation X into image information indicating a radiation image corresponding to the detected radiation dose. The detector 40, the cassette control unit 120 that reads image information from the radiation detector 40, the flexible substrate 46 that connects the radiation detector 40 and the cassette control unit 120, and the amount of variation per unit time of the flexible substrate 46 are determined in advance. Since the cassette control unit 120 that stops reading image information while exceeding a predetermined threshold value is provided, it is possible to suppress degradation of the image quality of the radiation image.

  Further, the electronic cassette 20 according to the first exemplary embodiment has the amount of fluctuation per unit time of the flexible substrate 46 when the magnitude of vibration measured by the vibration sensor 48 exceeds a predetermined magnitude of vibration. Therefore, it is possible to easily determine whether or not the amount of fluctuation per unit time of the flexible substrate 46 exceeds a predetermined threshold value.

  In addition, the electronic cassette 20 according to the first embodiment is determined in advance when the time during which the magnitude of vibration measured by the vibration sensor 48 exceeds a predetermined threshold exceeds a predetermined time. Since the speaker 121 that performs the displayed display is provided, the user can easily know that the reading of the image information is stopped.

  [Second Embodiment]

  Next, a second embodiment of the present invention will be described. Since the configuration of the imaging system according to the second embodiment is the same as that of the imaging system 10 according to the first embodiment except for a part of the configuration of the electronic cassette, the description thereof is omitted here. . In the second embodiment, only parts different from the first embodiment will be described.

  FIG. 6 is a schematic cross-sectional view showing the configuration of the electronic cassette 20B according to the second embodiment. FIG. 7 is a block diagram showing the main configuration of the photographing system 10B according to the second embodiment.

  As shown in FIGS. 6 and 7, the electronic cassette 20 </ b> B emits light toward the inner wall 34 </ b> A of the housing 34 instead of the vibration sensor 48 as compared with the electronic cassette 20 described in the first embodiment. The only difference is that a reflective photosensor 250 having a light emitting portion 250A that emits light and a light receiving portion 250B that receives light reflected by the inner wall 34A is applied.

  Next, a processing routine of the electronic cassette 20B when the cassette control unit 120 is reading image information held in the radiation detector 40 will be described with reference to FIG. FIG. 8 is a flowchart showing the flow of processing of the electronic cassette control processing program executed by the cassette control unit 120 of the electronic cassette 20B at this time, and the program is a microcomputer that realizes the cassette control unit 120. Is stored in advance in a predetermined area of the memory included in the memory.

  In step 300 in the figure, a change amount per unit time of the distance between at least one flexible substrate 46 and the inner wall 34A is a predetermined change amount (as an example, noise is superimposed on image information being transmitted through the flexible substrate 46). It waits until it exceeds the amount of change per unit time of the distance between the flexible substrate 46 and the inner wall 34A that is expected to be. That is, the fluctuation amount per unit time of at least one flexible board 46 is a predetermined threshold value (for example, a unit of flexible board 46 in which noise is expected to be superimposed on image information being transmitted through flexible board 46. Wait until the fluctuation amount per hour) is exceeded. In the electronic cassette 20B according to the second embodiment, the received light amount received by the light receiving unit 250B of the reflective photosensor 250 is applied as a physical quantity corresponding to the distance between the flexible substrate 46 and the inner wall 34A.

  In the next step 302, reading of the image information held by the radiation detector 40 is stopped, and in the next step 304, the amount of change per unit time of the distance between each flexible substrate 46 and the inner wall 34A is determined in advance. It is determined whether or not the amount of change is equal to or less than the determined change amount. If a negative determination is made, the process returns to step 302. If an affirmative determination is made, the process proceeds to step 306.

  In step 306, after reading of the image information held by the radiation detector 40 is resumed, the electronic cassette control processing program is terminated.

  As described above in detail, the electronic cassette 20B according to the second embodiment is a unit time of a distance between a predetermined member (in this case, the inner wall 34A) around the flexible substrate 46 and the flexible substrate 46. The amount of change per unit time of the flexible substrate 46 is determined to have exceeded a predetermined threshold when the measured amount of change exceeds a predetermined amount of change. It can be easily determined whether or not the amount of fluctuation per unit time exceeds a predetermined threshold value.

  As mentioned above, although this invention was demonstrated using said each embodiment, the technical scope of this invention is not limited to the range as described in each said embodiment. Various modifications or improvements can be added to the above-described embodiments without departing from the spirit of the invention, and embodiments to which the modifications or improvements are added are also included in the technical scope of the present invention.

  In addition, each of the above embodiments does not limit the invention described in the claims, and all combinations of features described in each of the above embodiments are indispensable for solving means of the invention. Not always. Each of the above embodiments includes inventions at various stages, and various inventions can be extracted by a combination according to the situation in a plurality of disclosed constituent requirements. Even if some constituent elements are deleted from all the constituent elements shown in each of the above embodiments, as long as an effect is obtained, a configuration in which these some constituent elements are deleted can be extracted as an invention.

  For example, in the second embodiment, the distance between the flexible substrate 46 and the inner wall 34A is measured by measuring the amount of light received by the reflective photosensor 250, but the present invention is not limited to this. For example, as shown in FIG. 9, a microswitch 350 having a pressing portion 350 </ b> A biased so as to protrude outward by a built-in return spring is used, and the tip of the pressing portion 350 </ b> A faces the flexible substrate 46. When the flexible substrate 46 vibrates, the pressing portion 350A is pressed by the flexible substrate 46 and the microswitch 350 is turned on, so that the distance between the flexible substrate 46 and the inner wall 34A is predetermined. It may be determined that the distance has been reached.

  In the second embodiment, the reflective photosensor 250 is provided on the flexible substrate 46. However, the present invention is not limited to this. The reflective photosensor 250 is provided on the inner wall 34A so as to face the flexible substrate 46. A sensor 250 may be provided. In this case, the flexible substrate 46 can be reduced in weight.

  Moreover, in the said 2nd Embodiment, although the inner wall 34A was applied as a predetermined member of this invention, this invention is not limited to this, For example, you may apply the base 42. In this case, the reflective photosensor 250 is attached to the flexible substrate 46 so that light is emitted toward the base 42. As described above, any member that is a constituent member of the electronic cassette 20B and can form a stray capacitance with the flexible substrate 46 is applicable as the predetermined member of the present invention.

  Further, in each of the above-described embodiments, the embodiment has been described with reference to an example in which reading of image information is stopped while the amount of variation per unit time of the flexible substrate 46 exceeds a predetermined threshold. Is not limited to this, and the amount of variation per unit time of the flexible board 46 with respect to the console 26 exceeds a predetermined threshold by performing communication between the console 26 and the electronic cassette 20. And, while the amount of variation exceeds the threshold value, the apparatus related to imaging (for example, the radiation irradiation apparatus 18) may be controlled so that imaging is prohibited.

  In each of the above embodiments, the radiation detector 40 and the circuit board 44 are connected by the flexible board 46, and the flexible board 46, the radiation detector 40, and the circuit board 44 are separated. The circuit board 44 and the flexible board 46 may be integrally manufactured. In this case, the present invention is effective.

  In addition, the configuration of the imaging system 10 described in the above embodiments (see FIGS. 1 and 3), the imaging system 10B (see FIG. 7), and the configuration of the electronic cassette 20 (see FIGS. 2 to 4). ) And the configuration of the electronic cassette 20B (see FIGS. 6 and 7) are merely examples, and it goes without saying that they can be changed according to the situation without departing from the gist of the present invention.

  The processing flow of the program described in the above embodiments (see FIGS. 5 and 8) is also an example, and unnecessary steps can be deleted or new steps can be made without departing from the gist of the present invention. Needless to say, can be added or the processing order can be changed.

It is a figure which shows the mode of the operating room where the imaging | photography system which concerns on embodiment was installed. It is a schematic sectional drawing which shows the structure of the electronic cassette concerning 1st Embodiment. It is a block diagram which shows the principal part structure of the imaging | photography system which concerns on 1st Embodiment. It is an equivalent circuit diagram paying attention to one pixel part of the radiation detector concerning an embodiment. It is a flowchart which shows the flow of a process of the electronic cassette control processing program which concerns on 1st Embodiment. It is a schematic sectional drawing which shows the structure of the electronic cassette concerning 2nd Embodiment. It is a block diagram which shows the principal part structure of the imaging | photography system which concerns on 2nd Embodiment. It is a flowchart which shows the flow of a process of the electronic cassette control processing program which concerns on 2nd Embodiment. It is a schematic sectional drawing which shows the other structure of the electronic cassette concerning 2nd Embodiment.

Explanation of symbols

10 Radiographic imaging system 14 Patient (subject)
18 Radiation irradiation device 20 Electronic cassette 26 Console (communication device)
34 Housing 34A Inner wall 40 Radiation detector (radiation detection means)
46 Flexible substrate 48 Vibration sensor (measuring means)
120 cassette control unit (reading means, stopping means)
121 Speaker (display means)
136 Display (display means)
250 Reflective photosensor (measuring means)

Claims (8)

Radiation detecting means for detecting radiation transmitted through the subject and converting it into image information indicating a radiation image corresponding to the detected radiation dose;
Reading means for reading image information from the radiation detection means;
A flexible substrate connecting the radiation detection means and the reading means;
Stop means for stopping reading by the reading means while the amount of variation per unit time of the flexible substrate exceeds a predetermined threshold value;
A portable radiographic imaging device including: A measuring unit that measures a change amount per unit time of a distance between the flexible substrate and a member that can form a stray capacitance between the flexible substrate and the flexible substrate;
The said stop means determines that the variation | change_quantity per unit time of the said flexible substrate exceeded the said threshold value when the variation | change_quantity measured by the said measurement means exceeded the predetermined variation | change_quantity. Portable radiographic imaging device. A measuring means for measuring the magnitude of vibration of the flexible substrate;
The stopping means determines that the amount of fluctuation per unit time of the flexible substrate exceeds the threshold when the magnitude of vibration measured by the measuring means exceeds a predetermined magnitude of vibration. 2. The portable radiographic image capturing apparatus according to 1.   4. The display device according to claim 1, further comprising a display unit configured to perform a predetermined display when a time during which the amount of fluctuation per unit time of the flexible substrate exceeds the threshold exceeds a predetermined time. The portable radiographic image capturing device according to claim 1. The portable radiographic imaging device according to any one of claims 1 to 4,
By performing communication with the portable radiographic image capturing device, a predetermined display is displayed when the amount of fluctuation per unit time of the flexible substrate exceeds the threshold exceeds a predetermined time. A display device for performing
Including radiographic imaging system.   A console for communicating with the portable radiographic imaging device;
  The display device communicates with the portable radiographic imaging device via the console, so that the time during which the amount of variation per unit time of the flexible substrate exceeds the threshold is the predetermined time. The radiographic image capturing system according to claim 5, wherein the predetermined display is performed when the value exceeds.   The display device performs communication with the portable radiographic image capturing device, and when the amount of fluctuation per unit time of the flexible substrate exceeds the threshold exceeds the predetermined time 6. The radiographic imaging system according to claim 5, wherein the radiographic imaging system is a console that performs the predetermined display.   Radiation detection means for detecting radiation transmitted through the subject and converting it into image information indicating a radiation image corresponding to the detected radiation dose; Reading means for reading image information from the radiation detection means; and the radiation detection means; A portable radiographic imaging device having a flexible substrate connecting the reading means;
  Recognizing that the amount of fluctuation per unit time of the flexible substrate exceeds a predetermined threshold by performing communication with the portable radiographic imaging device, the amount of fluctuation per unit time of the flexible substrate A communication device that controls devices related to shooting so that shooting is prohibited while the value exceeds the threshold;
  Including radiographic imaging system.

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