JP6121021B2 - Radiography system - Google Patents

Description

The present invention relates to a radiation imaging system .

  In the X-ray imaging system, an attempt has been made to improve the handling performance of the sensor unit by improving the handling performance of the sensor unit by making the sensor unit a unit structure that can be physically separated. X-ray imaging includes X-ray fluoroscopic imaging and X-ray still image imaging. X-ray fluoroscopic imaging is performed in units of frames.

  A configuration example of an X-ray imaging system in which the sensor unit is physically separated is shown in FIG. FIG. 1 is a diagram illustrating an example of an X-ray imaging system in which a sensor unit is separated. The X-ray imaging system includes a sensor unit 110, an image processing unit 120, and an X-ray generation unit 130.

  The sensor unit 110 can be physically separated from other units.

  The image processing unit 120 includes a timing generation unit 121 and performs image processing on the captured image transmitted from the sensor unit 110. The timing generation unit 121 generates a trigger signal for performing synchronization control of the sensor unit 110 and the X-ray generation unit 130.

  The X-ray generation unit 130 includes an X-ray tube 131 and a collimator 132, generates X-rays, and emits X-rays toward the sensor unit 110. The X-ray tube 131 generates radiation for X-ray exposure. The collimator 132 adjusts the radiation to be exposed.

  A case where sensor reading is performed only once for each X-ray exposure will be described with reference to FIG. FIG. 2 is an example of a timing chart of exposure and readout when using a CMOS sensor. The X-ray output 201 is activated by the exposure trigger 200 transmitted to the X-ray generation unit 130, and the sensor readout 203 is started by the sensor readout trigger 202. Since a delay time is required from the start of X-ray exposure to the start of sensor readout, the sensor readout trigger 202 has a certain offset 204 from the exposure trigger. In addition, since a certain time is required until the sensor reading is completed, accurate imaging data cannot be read if the next X-ray exposure is started before the sensor reading is completed. Therefore, the time 205 from the completion of sensor reading to the start of the next X-ray exposure needs to be positive.

  A case where sensor reading is performed twice for each X-ray exposure will be described with reference to FIG. FIG. 3 is an example of a timing chart of exposure and readout when using the LANMIT sensor. In the LANMIT sensor, the X-ray intensity distribution information is calculated by subtracting the non-irradiation charge distribution information from the charge distribution information immediately after the X-ray irradiation for each frame. Therefore, two sensor readings are required.

  In this case as well, as in the case described with reference to FIG. 2, the time 300 from the completion of the second sensor reading to the start of the next X-ray exposure needs to be positive.

  As described above, even in the configuration in which the sensor unit 110 as shown in FIG. 1 is physically separable, the X-ray generation unit 130 and the sensor unit 110 need to operate strictly in synchronization. . In order to satisfy such requirements, in the X-ray imaging system in which the sensor unit 110 can be separated, trigger signal transmission using a dedicated line 140 as shown in FIG. 1 has been performed.

  However, the merit of the X-ray imaging system in which the sensor unit 110 can be separated is that the portability of the sensor unit 110 is improved, and imaging can be performed at various positions. From such a viewpoint, it is desirable that the sensor unit 110 is in a completely wireless state. In order to make the sensor unit 110 wireless, there is a problem of how to handle a power source and large-capacity image data. However, the biggest problem is how to realize the synchronization between the sensor unit 110 and the X-ray generation unit 130 wirelessly as described above.

  Usually, protocols used for wireless communication include IEEE 802.11 (wireless LAN), IEEE 802.15.3 (UWB), and the like. In wireless communication using these protocols, data communication can be performed using a packet composed of a header and a payload in the constructed network. However, it is difficult to synchronize by defining a dedicated packet on a communication protocol such as a wireless LAN. This is because the necessary arbitration time is indefinite in CSMA / CA (Carrier Sense Multiple Access with Collision Avoidance), which is a best-effort access control method that is common in wireless communication protocols.

  On the other hand, in the wireless communication protocol, a quality-priority communication method that considers Quality of Service (QoS) based on a TDMA (Time Division Multiple Access) method instead of the CSMA / CA method is also defined. FIG. 4 is an example of a configuration of a super frame 400 which is a communication unit of IEEE 802.15.3 which is a wireless communication standard using the TDMA system. As shown in FIG. 4, in this wireless communication standard, wireless communication is performed by repeating the super frame 400. In the superframe 400 # m configuration, the beacon 401 # m includes time allocation information of each component (Contention access period, MCTA, CTA) in the superframe 400 # m.

  The node that has received the beacon 401 counts the priority communicable period (MCTA) assigned to each node in units of microseconds using a built-in timer, and performs QoS communication at a designated time. By performing such QoS communication, the time required for wireless arbitration can be shortened.

  However, even if the time required for arbitration is shortened as much as possible, it is necessary to perform protocol analysis and extract actual timing information included in the payload from the wirelessly communicated wireless packet. There is a delay in using the extracted timing information as a trigger signal. The time loss due to this protocol analysis is also one of the factors that make it difficult to synchronize with wireless packets.

  Patent Document 1 discloses a technique for realizing synchronization between the sensor unit 110 and the X-ray generation unit 130 in a wireless environment in which both units are physically separated. In this method, each unit to be separated has a built-in timer, and before the two units are separated, they are wired to synchronize between the two timers. After separation, the units are synchronized based on their built-in timer values. I do.

  In addition, there is a configuration as shown in FIG. FIG. 5 is an example of a system diagram of the wireless X-ray imaging system. Portions common to FIG. 1 are assigned the same reference numerals, and descriptions thereof are omitted. In this configuration, in addition to the wireless link 500 that performs data communication, a second wireless link 501 dedicated to synchronization that does not require communication arbitration and requires a short protocol analysis time is provided. A trigger signal is transmitted using this dedicated wireless link 501.

JP 2006-305106 A

  When the method disclosed in Patent Document 1 is used, there is a problem that an error occurs between timers built in each unit as time elapses, and synchronization cannot be achieved. In addition, a method of providing a separate radio link dedicated for synchronization has a problem in terms of cost.

  Therefore, an object of the present invention is to provide a wireless X-ray fluoroscopy system that can be used in a single radio link configuration and has little synchronization error between units.

In one aspect of the present invention, in one aspect of the present invention, a radiation imaging system in which a radiation imaging apparatus performs radiation imaging based on radiation irradiated by the radiation generation apparatus, the radiation generation apparatus and the radiation imaging apparatus. A synchronization signal to synchronize with each other is transmitted wirelessly repeatedly according to a frame period, and included in the radiation imaging apparatus, and in response to the synchronization signal being transmitted, an electrical signal based on radiation A radiation sensor to be read; and a determination unit that determines whether or not the radiation sensor is reading the electrical signal, and the transmission unit determines a timing at which the synchronization signal is transmitted by the determination unit. A radiation imaging system is provided that is controlled based on the result .

  According to the present invention, accumulation of errors over time can be prevented, and synchronization errors between units can be reduced. In addition, since the synchronization time can be managed with an offset value for each frame period, the management of the synchronization offset value can be simplified.

It is a figure explaining an example of the X-ray imaging system which the sensor unit isolate | separated. It is an example of a timing chart of exposure and readout when using a CMOS sensor. It is an example of a timing chart of exposure and readout when using a LANMIT sensor. It is an example of a super frame configuration diagram of the IEEE 802.15.3 standard. 1 is an example of a system diagram of a wireless X-ray imaging system. It is an example of the system block diagram for demonstrating the outline | summary of the 1st Embodiment of this invention. It is a figure explaining an example of a system block diagram concerning a 1st embodiment of the present invention. It is a figure explaining an example of the internal block diagram of the compare timer which concerns on the 1st Embodiment of this invention. It is a figure explaining an example of the timing sequence diagram which concerns on the 1st Embodiment of this invention. It is a figure explaining an example of the system block diagram concerning the 2nd Embodiment of this invention. It is a figure explaining an example of the internal block diagram of the compare timer which concerns on the 2nd Embodiment of this invention. It is a figure explaining an example of the timing sequence diagram concerning the 2nd Embodiment of the present invention. It is a figure explaining an example of the frame rate switching flowchart which concerns on the 2nd Embodiment of this invention. It is a figure for demonstrating an example of the timing sequence diagram concerning the 3rd Embodiment of this invention. It is a figure explaining an example of the frame rate switching flowchart which concerns on the 3rd Embodiment of this invention. It is a figure explaining an example of the timing sequence diagram concerning the 4th Embodiment of this invention. It is a figure explaining an example of the timing sequence diagram concerning a 6th embodiment of the present invention. It is a figure explaining an example of the system block diagram concerning the 5th Embodiment of this invention. It is an internal block diagram of the compare timer which concerns on the 5th Embodiment of this invention. It is a figure explaining an example of the system block diagram concerning the 6th Embodiment of this invention. It is a figure explaining an example of the flowchart which concerns on the 6th Embodiment of this invention.

  Hereinafter, embodiments of a wireless X-ray fluoroscopy system according to the present invention will be described with reference to the accompanying drawings. X-ray fluoroscopic imaging is simply expressed as fluoroscopy.

<First Embodiment>
The outline of the present embodiment will be described with reference to FIG. It is an example of the system block diagram for demonstrating the outline | summary of the 1st Embodiment of this invention.

  The X-ray fluoroscopic system according to the present invention includes a sensor unit 610 physically separated from other units, and an image processing unit 620 including an X-ray generation unit 630 that needs to operate in synchronization with the sensor unit 610. .

  The sensor unit 610 includes a wireless communication unit A611 and a compare timer A612. The compare timer A612 generates a sensor readout trigger. Sensor reading is started by this sensor reading trigger.

  The image processing unit 620 includes a wireless communication unit B621, a compare timer B622, and a timing generation unit 623. The compare timer B 622 generates an exposure trigger for the X-ray tube 631. X-ray exposure is started by this exposure trigger. The timing generation unit 623 generates a timing signal 624 for performing synchronization control of the sensor unit 610 and the X-ray generation unit 630.

  A wireless link 640 such as IEEE802.11 or IEEE802.15.3 is established between the sensor unit 610 and the image processing unit 620. The captured image data and the like are communicated through the wireless link 640. In this embodiment, it is assumed that the wireless communication unit B621 functions as an IEEE 802.11 access point (AP) or an IEEE 802.15.3 piconet coordinator (PNC). However, the wireless communication unit A611 and other wireless communication devices (not shown) may function as APs or PNCs. The case where the wireless communication unit A611 functions as an AP or PNC will be described in the sixth embodiment.

  APs and PNCs periodically send out beacon signals. In the present embodiment, the timing signal 624 generated by the timing generator 623 is received, and the wireless communication unit B621 transmits a beacon signal.

  The X-ray generation unit 630 includes an X-ray tube 631 and a collimator 632, generates X-rays, and emits X-rays toward the sensor unit 610. The X-ray tube 631 generates radiation for X-ray exposure. The collimator 632 adjusts the radiation to be exposed.

  First, the operation of the image processing unit 620 will be described. Upon receiving the timing signal 624, the wireless communication unit B621 transmits a beacon signal, and at the same time transmits a compare timer B reset signal 625 to the compare timer B622 connected by wire. The count value of the compare timer B 622 is reset by receiving the compare timer B reset signal, and then restarts counting up. In the compare timer B 622, a count value from when the compare timer B 622 is reset until the exposure trigger signal 641 is transmitted is set in advance. When the count value matches this coefficient value, the compare timer B 622 transmits an exposure trigger signal 641 to the X-ray tube 631. Thus, X-ray exposure can be started after a predetermined time has elapsed since the beacon signal was transmitted. The exposure time is, for example, 10 milliseconds.

  Next, the operation of the sensor unit 610 will be described. The wireless communication unit A611 that has received the beacon signal transmits a compare timer A reset signal 615 to the compare timer A612 immediately after receiving the beacon signal. The count value of the compare timer A 612 is reset by receiving the compare timer A reset signal 615 and then restarts counting up. A count value until the sensor readout trigger signal is transmitted is set in advance in the compare timer A612. When the count value matches this coefficient value, the compare timer A 612 transmits a sensor readout trigger signal. Thus, sensor reading can be started after a predetermined time has elapsed since the beacon signal was transmitted.

  As described above, by simultaneously resetting the first counter included in the sensor unit 610 and the second counter included in the image processing unit 620 when the beacon signal is transmitted, both the beacon signals are transmitted each time. Units can be synchronized. In addition, since the frame is triggered by the transmission of the beacon signal, it is possible to perform fluoroscopy with a desired frame cycle by matching the communication interval of the beacon signal with the frame cycle during fluoroscopy.

  The operation outlined above will be described in detail below with reference to FIGS. First, each figure will be described.

  FIG. 7 is a diagram illustrating an example of a system block diagram. Portions common to FIG. 6 are given the same reference numerals, and descriptions thereof are omitted.

  The sensor unit 610 further includes an X-ray sensor 711, a sensor front end 712, a CPU 713, and a memory 714 in addition to the components described in FIG. The X-ray sensor 711 converts X-ray intensity distribution information in each area on the panel into electrical information using a photoelectric conversion element. The sensor front end 712 receives the sensor readout trigger signal 716 and sequentially performs readout processing from the X-ray sensor 711. The CPU 713 controls the sensor unit 610. The memory 714 stores read data from the X-ray sensor 711.

  The image processing unit 620 further includes a CPU 721, a memory 722, an image processing engine 723, an HDD 724, and an interface controller 725 in addition to the components described in FIG.

  The CPU 721 controls the image processing unit 620. The memory 722 is used as a work memory in the CPU 721 and the image processing unit 620. The image processing engine 723 assists image processing in hardware. The HDD 724 is a secondary storage device that stores image data. The interface controller 725 is a controller area network (CAN), for example, and is provided for the image processing unit 620 to control an external device.

  The X-ray generation unit 630 further includes a high voltage generation unit 731 in addition to the components described in FIG. The high voltage generation unit 731 performs high voltage generation for X-rays.

  FIG. 8 is a diagram for explaining an example of an internal block diagram of the compare timer 800. The compare timer A 612 and the compare timer B 622 both have the configuration shown in FIG.

  The compare timer 800 includes a counter 801, a beacon counter 802, a trigger valid register 803, a comparison register a804, a comparison register b805,..., A comparison register n806, and an oscillator (OSC) 820.

  The oscillator 820 generates a clock at regular intervals. The counter 801 counts the clock output from the oscillator 820. The beacon counter 802 receives the compare timer reset signal 821 and controls whether or not to output the counter reset signal 809 to the counter 801. Here, the compare timer reset signal 821 corresponds to the compare timer A reset signal 615 or the compare timer B reset signal 625. The trigger valid register 803 is used for setting whether to allow trigger output from the compare timer 800.

  In the case of permission, “trigger output enabled” is set, and a trigger signal permission output 811 is output. If not permitted, “trigger output disabled” is set and nothing is output. The comparison register a 804, the comparison register b 805, and the comparison register n 806 compare the count value preset in the register with the count value of the counter 801. If both match, a one-shot pulse output is output. Each one-shot pulse output from the comparison register is ANDed by an OR gate 807.

  For this reason, when a one-shot pulse output is output from at least one of the comparison registers, the one-shot pulse output is also output from the OR gate 807. The one-shot pulse output output from the OR gate 807 is logically ORed with the trigger signal permission output 811 by the AND gate 808, and the trigger signal 823 is output based on the OR. Therefore, the trigger signal 823 is not output from the AND gate 808 as long as the trigger valid register 803 is set to “trigger output disabled”. The trigger signal 823 corresponds to the exposure trigger signal 641 or the sensor readout trigger signal 716.

  FIG. 9 is a diagram illustrating an example of a timing sequence diagram. In fluoroscopy, X-ray exposure is performed every frame period 900, and the electric field intensity distribution information obtained by the sensor unit 610 at that time is read out. As described above, strict management is required for the X-ray exposure timing and the sensor readout timing. Although the present embodiment deals with a case where sensor reading is required twice per frame, the present invention can be implemented when sensor reading is required once or more per frame. Since this is the same in the subsequent embodiments, no particular mention is made in the subsequent embodiments.

  The frame period 900 is an X-ray image capturing period, which is 500 ms for 2 frames per second and about 33.3 ms for 30 frames per second. The exposure trigger offset 901 is an offset from the start of the frame until the compare timer B 622 outputs an exposure trigger signal. The readout trigger offset a902 is an offset from the start of the frame until the compare timer A 612 outputs the first sensor readout trigger signal. The readout trigger offset b903 is an offset from the start of the frame until the compare timer A 612 outputs the second sensor readout trigger signal. A beacon signal (B) 904 is a beacon signal used in the wireless link 640. When reading is completed by the sensor unit 610, image data is transferred 905 and 906 via the wireless link 640.

  The operation of the entire X-ray fluoroscopic apparatus according to the present invention will be described in detail with appropriate reference to FIGS. 7 to 9 described above. This operation is processed by the CPUs 713 and 721 of each unit executing programs read into the memories 714 and 722, respectively.

  First, the following settings are made prior to fluoroscopy.

  A frame period 900 is set in the timing generation unit 623 in the image processing unit 620. Further, a count value corresponding to the exposure trigger offset 901 is set in the comparison register a804 in the compare timer B622. This count value is the number of clocks generated by the oscillator 820 within a desired time. The same applies to the following count values. Similarly, a count value corresponding to the read trigger offset a902 is set in the comparison register a804 in the compare timer A612. Also, a count value corresponding to the read trigger offset b903 is set in the comparison register b805.

  Further, since the comparison registers other than the comparison register for which the count value is set are not used in this embodiment, “0” is cleared so as not to generate an extra one-shot pulse output.

  In this embodiment, the beacon counters 802 of both the compare timers 612 and 622 always output the counter reset signal 809 when receiving the compare timer reset signal 821. It is assumed that the trigger valid register 803 of both compare timers 612 and 622 is set to “trigger output enabled”.

  Based on the above initial settings, operations of the image processing unit 620 and the sensor unit 610 after the start of the frame will be described.

  First, the operation of the image processing unit 620 will be described. The timing generation unit 623 transmits a timing signal 624 to the wireless communication unit B 621 at a preset interval. As described above, the frame period is set in advance for the interval. Upon receiving the timing signal 624, the wireless communication unit B621 prepares for transmission of the beacon signal 904 and transmits the beacon signal 904 through the wireless link 640. At the same time, a compare timer B reset signal 625 is transmitted to the compare timer B 622. The beacon counter 802 of the compare timer B 622 that has received the compare timer B reset signal 625 outputs a counter reset signal 809.

  The counter 801 of the compare timer B 622 that has received the counter reset signal 809 is reset and starts counting from “0”. Since the counter 801 counts up for each clock generated by the oscillator 820, each comparison register in the compare timer B 622 compares the offset value set in each comparison register with each count-up. As described above, a count value corresponding to the exposure trigger offset 901 is set in the comparison register a804. Therefore, the comparison register a804 outputs a one-shot pulse output when the count value of the counter 801 matches the count value of the exposure trigger offset 901.

  A signal is output from the OR gate 807 regardless of the outputs from the other comparison registers by the one-shot pulse output output from the comparison register a804. Furthermore, in this embodiment, since the trigger valid register 803 is set to “trigger output enabled”, the exposure trigger signal 641 is output from the compare timer B 622 through the AND gate 808.

  The output exposure trigger signal 641 is transmitted via wire to the high voltage generation unit 731 of the X-ray generation unit 630, and radiation is emitted from the X-ray tube 631.

  Next, the operation of the sensor unit 610 will be described. The wireless communication unit A611 that has received the beacon signal 904 outputs a compare timer A reset signal 615 to the compare timer A612 immediately after confirming that the received signal is the beacon signal 904. The beacon counter 802 of the compare timer A 612 that has received the compare timer A reset signal 615 outputs a counter reset signal 809.

  The counter 801 of the compare timer A 612 that has received the counter reset signal 809 is reset and starts counting from “0”. Since the counter 801 counts up for each clock generated by the oscillator 820, each comparison register in the compare timer A 612 compares the offset value set in each comparison register with each count-up. Here, as described above, a count value corresponding to the read trigger offset a902 is set in the comparison register a804. Further, a count value corresponding to the read trigger offset b903 is set in the comparison register b805. For this reason, the comparison register a804 outputs a one-shot pulse output when the count value of the counter 801 matches the count value corresponding to the read trigger offset a902.

  A signal is output from the OR gate 807 regardless of the outputs from the other comparison registers by the one-shot pulse output output from the comparison register a804. Furthermore, in this embodiment, since the trigger valid register 803 is set to enable trigger output, the first sensor read trigger signal 716 is transmitted from the compare timer A 612 to the sensor front end 712 through the AND gate 808. The sensor front end 712 that has received the sensor read trigger signal 716 starts reading the X-ray sensor 711. Here, for example, an image at the time of radiation irradiation is read out.

  Further, when the counter 801 counts up and the count value of the counter 801 matches the count value corresponding to the read trigger offset b903, the comparison register b805 outputs a one-shot pulse output. In the same manner as before, the sensor front end 712 starts reading of the X-ray sensor 711. What is read out here is, for example, an image when no radiation is applied.

  The above operation is repeated by transmitting a beacon synchronized with the frame period 900. Thereby, the timing synchronization between the compare timer A 612 in the sensor unit 610 and the compare timer B 622 in the image processing unit 620 can be performed every frame period 900. As a result, the synchronization error between the units 610 and 620 can be reduced.

<Second Embodiment>
In the first embodiment, the method of performing timing synchronization between the wirelessly connected sensor unit and the image processing unit using the beacon signal synchronized with the frame period has been described. In the second embodiment, an application mode of the present invention when performing a procedure such as angiography for performing fluoroscopy while changing the frame period will be described.

  In order to explain the outline of the present embodiment, consider a case where the first frame period is changed to the second frame period. It is assumed that fluoroscopy is performed using the first sensor readout trigger offset and the first exposure trigger offset used in the first frame period. Here, the second sensor readout trigger offset and the second exposure trigger offset used in the second frame period are stored in the sensor unit 610 and the image processing unit 620 in advance. And it switches to a 2nd frame period according to transmission of a beacon signal.

  The configuration of this embodiment will be described with reference to FIGS. FIG. 10 is a diagram illustrating an example of a system block diagram according to the second embodiment of the present invention. In FIG. 10, the same reference numerals are given to the common parts with FIG. 7 described in the first embodiment, and the description will be omitted.

  The image processing unit further includes an I / O controller 1020, a display control unit 1021, an input device 1022, and a display 1023 in addition to the configuration of FIG. The I / O controller 1020 provides a user interface for parameter setting and work selection to the user. The display control unit 1021 generates a graphical user interface for the user to operate the fluoroscopic system. The input device 1022 is a keyboard, a touch panel, a mouse, or the like that is directly operated by the user. The display 1023 displays a graphical user interface.

  FIG. 11 is a diagram illustrating an example of an internal block diagram of the compare timer according to the second embodiment of the present invention. Portions common to FIG. 8 described in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The compare timer 800 further includes a comparison register c1100, a comparison register d1101, and flags (OE) 1102-1106 in each comparison register in addition to the components shown in FIG. Flags 1102 to 1106 control whether or not a one-shot pulse is output from the comparison register. When the flag is set to “output enabled”, it is possible to output a one-shot pulse output. When the flag is set to “impossible to output”, even if the count value of the comparison register matches the count value, the one-shot pulse output is not output.

  Subsequently, a timing sequence in the present embodiment will be described with reference to FIG. It is a figure explaining an example of the timing sequence diagram concerning the 2nd Embodiment of the present invention. Portions common to FIG. 9 described in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In fluoroscopy in the present embodiment, first, X-ray exposure is performed every frame period a1201, and the electric field intensity distribution information obtained by the sensor unit 610 is read. Thereafter, the frame rate is switched from the middle to the frame period b1202. The values of the exposure trigger offset and the readout trigger offset are also changed to correspond to the changed frame period. In the fluoroscopy of the frame period a1201, an exposure trigger offset a1203, a read trigger offset a1204, and a read trigger offset b1205 are used. In the fluoroscopy of the frame period b1202, an exposure trigger offset b1206, a read trigger offset c1207, and a read trigger offset d1208 are used.

  Processing performed by the image processing unit 620 and the sensor unit 610 from the start of the X-ray fluoroscopy system to which the present invention is applied until the frame rate is changed will be described with reference to FIG. FIG. 13 is a diagram illustrating an example of a frame rate switching flowchart according to the second embodiment of the present invention. This flowchart is processed by the CPUs 713 and 721 executing programs loaded in the memories 714 and 722, respectively.

  In step 1300, the image processing unit 620 is activated to perform initialization processing. In step 1350, the sensor unit 610 is activated and an initialization process is performed.

  Thereafter, in step 1301, “trigger output disabled” is set in the trigger valid register 803 provided in the compare timer B 622 in the image processing unit 620. In step 1351, “trigger output disabled” is set in the trigger valid register 803 provided in the compare timer A 612 in the sensor unit 610. With these settings, output of the trigger signal 823 from each compare timer 800 is prohibited.

  In step 1302, the wireless communication unit B621 is initialized. In step 1352, the wireless communication unit A611 is initialized. By these processes, a wireless link 640 is established with the wireless communication unit B621 as an AP or PNC. At this time, since it is not necessary to define the beacon interval used for the wireless link 640, an appropriate period is used in the wireless communication standard.

  When the preparation up to this point is completed, in step 1303, the image processing unit 620 displays a graphical user interface (GUI) on the display 1023 via the display control unit 1021, and accepts selection of work contents from the user. The user operates the input device 1022 while referring to the GUI, and selects a technique with a desired work content.

  In step 1304, it is determined whether the procedure selection has been completed. If not completed (“NO” in step 1304), the process returns to step 1303 and the technique selection screen continues to be displayed. If completed ("YES" in step 1304), the process proceeds to step 1304.

  In step 1305, the procedure information input from the input device 1022 is transmitted to the CPU 721 via the I / O controller 1020. Here, it is determined whether or not “perspective” has been selected as the procedure. If it is selected (“YES” in step 1305), the process proceeds to step 1306. When “fluoroscopic” is not selected (“NO” in step 1305), other procedures are performed, but other procedures are not described because they are out of the scope of the present invention.

  In step 1306, the CPU 721 continuously displays a GUI for prompting the user to set a fluoroscopic parameter such as a frame rate, a tube current, and a tube voltage applied during fluoroscopy, and accepts a user input.

  As shown in the first embodiment, a frame period determined from a frame rate set by the user is used as the beacon interval. Therefore, the CPU 721 calculates a count value corresponding to the beacon interval and the corresponding exposure trigger offset and readout trigger offset from the set frame rate. The image processing unit 620 transmits to the sensor unit 610 fluoroscopic parameters 1321 required by the sensor unit 610, such as parameters set by the user and count values corresponding to the calculated readout trigger offset.

  In step 1307, a beacon interval is set in the timing generation unit 623. Thereby, the beacon signal is transmitted at the beacon interval set in the timing generation unit 623.

  Further, since the exposure trigger offset a1203 is used in the frame period a1201, a count value corresponding to this value is set in the comparison register a804 of the compare timer B622. Further, the flag 1102 of the comparison register a is set to “output enabled”. The other flags 1103 to 1106 of the comparison registers are set to “output impossible”.

  Here, a one-shot pulse output may be output from the comparison register in which the flag is set to be valid. However, since the trigger valid register 803 is set to “trigger output disabled” in step 1301, X-ray exposure will not be started erroneously.

  In step 1353, the sensor unit 610 sets a count value corresponding to the readout trigger offset included in the received fluoroscopic parameter 1321 in the compare timer A612. Since the read trigger offset a1204 and the read trigger offset b1205 are used in the frame period a1201, the count values corresponding to these values are set in the comparison register a804 and the comparison register b805 of the compare timer A612, respectively. Further, the flags 1102 and 1103 of the comparison register are set to “output enabled”. Further, the flags 1104 to 1106 of the other comparison registers are set to “output impossible”.

  Here, a one-shot pulse output may be output from the comparison register in which the flag is set to be valid. However, since the trigger valid register 803 is set to “trigger output disabled” in step 1351, sensor reading is not erroneously started.

  Since the preparation for fluoroscopy has been completed, the image processing unit 620 receives a fluoroscopy start instruction from the user in step 1308.

  In response to a fluoroscopic start instruction from the user (“YES” in step 1308), in step 1309, the CPU 721 sets “trigger output enabled” to the trigger valid register 803 of the compare timer B 622. At the same time, a trigger valid request message 1322 is transmitted from the wireless communication unit B621 to the sensor unit 610. In step 1354, the sensor unit 610 determines whether or not the trigger valid request message 1322 has been received. If received (“YES” in step 1354), in step 1355, “trigger output enabled” is set in the trigger valid register 803 of the compare timer A612.

  Through the above processing, in step 1310, the counter 801 is reset every time the beacon signal 1323 is transmitted, and X-rays are emitted from the X-ray tube 631 after the exposure trigger offset a1203 elapses, as in the first embodiment. In step 1356, the counter 801 is reset every time the beacon signal 1323 is received, and sensor reading is performed when the reading trigger offset a1204 has elapsed, as in the first embodiment. Sensor reading is also performed when the reading trigger offset b1205 has elapsed. Thereby, the fluoroscopy in the frame period a1201 is started.

  Next, consider a case where a request to change the frame rate is made during fluoroscopy with the frame period a1201. In step 1311, it is determined whether a frame rate change command is received from the user. If it is received (“YES” in step 1311), the process proceeds to step 1312. For example, as shown in FIG. 12, it is assumed that a frame rate change command 1210 is received from the user during fluoroscopy in the frame period a1201.

  Returning to FIG. 13, in step 1312, the CPU 721 calculates the frame period, the exposure trigger offset, and the read trigger offset from the requested frame rate after the change by the frame rate change instruction 1210. In the frame period b1202, an exposure trigger offset b1206, a read trigger offset c1207, and a read trigger offset d1208 are used.

  The CPU 721 sets a count value corresponding to the exposure trigger offset b1206 in the comparison register b805 of the compare timer B622. The flag 1103 of the comparison register b805 is set to “output disabled”. Since only the comparison register a804 has a flag set to “output enabled” at this time, X-ray exposure corresponding to the frame period a1201 is continued even after the comparison register b805 is set.

  Further, the image processing unit 620 transmits a frame rate change request message 1211 to the sensor unit 610 via the wireless link 640. The frame rate change request message 1211 includes count values corresponding to the read trigger offset c1207 and the read trigger offset d1208. As shown in FIG. 12, the frame rate change request message 1211 is transmitted, for example, during data transfer.

  In step 1357 of FIG. 13, the sensor unit 610 determines whether or not the frame rate change request message 1211 has been received. If received (“YES” in step 1357), the process proceeds to step 1358.

  In step 1358, the CPU 713 sets count values corresponding to the read trigger offset c1207 and the read trigger offset d1208 in the comparison register c1100 and the comparison register d1101 of the compare timer A612, respectively. Corresponding flags 1104 and 1105 are set to “output disabled”. Since only the comparison register a 804 and the comparison register b 805 have a flag set to “output enabled” at this time, sensor reading corresponding to the frame period a 1201 is continued after this setting.

  When the change operation of the compare timer A 612 is completed in step 1359, the sensor unit 610 transmits a frame rate change confirmation message 1212 to the image processing unit 620. As shown in FIG. 12, the frame rate change confirmation message 1212 may be communicated in a different frame from the frame rate change request message 1211.

  In step 1313 of FIG. 13, the image processing unit 620 determines whether or not the frame rate change confirmation message 1212 has been received. If received (“YES” in step 1313), the image processing unit 620 can determine that both the image processing unit 620 and the sensor unit 610 are operable in the frame period b1202. Therefore, the process proceeds to step 1314, and the timing signal generation interval of the timing generation unit is changed to the frame period b1202. As a result, a beacon signal is transmitted at the frame period b1202 from the next timing signal.

  In step 1315, the image processing unit 620 determines whether a beacon signal 1213 has been transmitted. If it is transmitted (“YES” in step 1315), the process proceeds to step 1316.

  In step 1316, immediately after the beacon signal 1213 is transmitted, the image processing unit 620 sets the flag 1102 of the comparison register a 804 of the compare timer B 622 to disable output, and sets output enable to the flag 1102 of the comparison register b 805. Through the above processing, after the transmission of the beacon signal 1213, X-ray exposure is performed at the frame period b1202.

  On the other hand, the sensor unit 610 determines in step 1360 whether the beacon signal 1213 has been received. If a call is made (“YES” in step 1360), the process moves to step 1361.

  In step 1361, immediately after receiving the beacon signal 1213, the sensor unit 610 sets the flags of the comparison register a804 and the comparison register b805 of the compare timer A612 to output disabled. Further, the output enable is set in the flags of the comparison register c1100 and the comparison register d1101. Through the above processing, after the reception of the beacon signal 1213, sensor reading is performed at the frame period b1202.

  The change of the flag is processed in a very short time compared to the exposure trigger offset and the readout trigger offset. Therefore, both units can start with a trigger offset corresponding to the frame period b1202 by transmitting the beacon signal 1213. As described above, before the beacon signal 1213 is transmitted, even if the offset value corresponding to the frame period b1202 is registered in the comparison register, the beacon signal 1213 is continuously seen with the trigger offset corresponding to the frame period a1201. Therefore, registration in the comparison register in the image processing unit 620 and registration in the comparison register in the sensor unit 610 may be performed in separate frames.

  In the present embodiment, the frame rate change by the user frame rate change instruction 1210 has been described. However, the cause of the frame rate change is the same even when it is programmed in advance and automatically requested.

  If the end of fluoroscopy is requested in step 1318 or if still image shooting after fluoroscopy is requested in step 1317, the process proceeds to step 1319.

  In step 1319, the CPU 721 of the image processing unit 620 sets “trigger output disabled” to the trigger valid register 803 of the compare timer B 622. At the same time, a fluoroscopic end message 1327 is transmitted from the wireless communication unit B621 to the sensor unit 610 so as to invalidate the trigger output.

  In step 1362, the sensor unit 610 determines whether or not the fluoroscopic end message 1327 has been received. If received (“YES” in step 1362), in step 1363, “trigger output disabled” is set in the trigger valid register 803 of the compare timer A612.

  As described above, in this embodiment, even when performing fluoroscopy while changing the frame rate, the timing synchronization of both compare timers can be performed for each beacon output, and the synchronization error between both units 610 and 620 can be reduced. . In addition, the frame period can be changed continuously without stopping the system.

<Third Embodiment>
In the embodiments described above, the method of performing the timing synchronization between the wirelessly connected sensor unit and the image processing unit simply and accurately using the beacon signal synchronized with the frame period has been described. In the third embodiment, a technique for realizing synchronization between the frame rate and the beacon interval will be described.

  Even if the frame period and the beacon interval are generally matched, the beacon interval may not be freely selected unless an original wireless communication standard is defined. For example, as shown in FIG. 4, the beacon interval of the IEEE 802.15.3 (UWB) standard is 512 μsec. To 65535 μsec. You can only choose between This can be expressed in terms of a frame rate from 1953 fps (= 1/512 μsec.) To 15.26 fps (= 1/65535 μsec.). Since actual fluoroscopy is generally performed at a frame rate of about 0.1 fps to 200 fps, it cannot be applied to fluoroscopy at a speed lower than 15.26 fps. Thus, when the frame period and the beacon interval cannot be made the same, the embodiments described above cannot be applied as they are. Therefore, in the third embodiment, a method for dealing with such a case will be described.

  Also in the third embodiment, the system configuration is the same as the configuration shown in FIG. The block diagram of the compare timer in the same system configuration is also the same as FIG.

  In this embodiment, the beacon counter 802 in the compare timer 800 is particularly used in order to adjust the beacon interval and the frame period that satisfy the standard value described above. The beacon counter 802 counts the compare timer reset signal 821 and resets the counter 801 with the counter reset signal 809 only when a predetermined number of times are received.

  FIG. 14 shows a timing sequence diagram when performing fluoroscopy at 10 fps using the IEEE 802.15.3 standard. FIG. 14 is a diagram for explaining an example of a timing sequence diagram according to the third embodiment of the present invention. As described above, the longest beacon interval that can be set in the IEEE 802.15.3 standard is 65.535 ms. Since the frame period 1400 when performing fluoroscopy at 10 fps is 100 ms, the frame period and the beacon interval cannot be matched as in the previous embodiments. Therefore, the beacon interval 1405 is set to 33.33 ms, and “3”, which is a natural number obtained by dividing the frame period by the beacon interval, is set as the count number in the beacon counter 802 in the compare timer 800. Thus, when the compare timer reset signal 821 is detected three times, the counter reset signal 809 is output only once. Since the compare timer reset signal 821 is output every time a beacon signal is transmitted as described above, the counter 801 of the compare timer A 612 and the compare timer B 622 is reset only once each time the beacon signal is transmitted three times. Is done. Accordingly, the counter 801 is reset every 33.33 ms × 3 = 100 ms and starts counting from “0”.

  For example, assume that the counter reset signal 809 is output when the beacon signal 1401 is transmitted. With the reception of the counter reset signal 809, the frame is started. Next, a compare timer reset signal 821 is output to the beacon counter 802 by the transmitted beacon signal 1402. However, since the beacon counter 802 has not reached the predetermined number of times, the counter reset signal 809 is not output. Therefore, the frame is continued. The same applies when the beacon signal 1403 is transmitted. When the beacon signal 1404 is transmitted, the beacon counter 802 outputs a counter reset signal 809 and a new frame is started.

  A process when the counter 801 of the compare timer 800 is reset when a predetermined number of beacons are generated will be described with reference to FIG. It is a figure explaining an example of the frame rate switching flowchart which concerns on the 3rd Embodiment of this invention. In FIG. 15, the description of the same processing as in FIG. 13 is omitted, and only the different processing is described with reference numerals.

  In steps 1501 and 1551, as described above, the counter 801 of the compare timer 800 of both units is reset every time a beacon signal is received a predetermined number of times.

  In steps 1502 and 1552, it is determined whether or not the counter 801 has been reset, and the setting value is changed in accordance with the changed frame period. This is because if the frame cycle change timing is determined by receiving the beacon signal, the set value may be changed in the middle of the frame.

  As described above, according to this embodiment, even in the case of a wireless communication standard in which the beacon interval cannot be increased, the timing synchronization of both compare timers can be performed for each frame, and the synchronization error between both units 610 and 620 can be reduced. it can.

<Fourth Embodiment>
In the third embodiment, the method of applying the present invention when setting the frame period to a value longer than the beacon interval defined in the wireless communication standard has been described. In the fourth embodiment, a method for setting the frame period to a value shorter than the beacon interval will be described.

  The beacon interval of the IEEE 802.11 (wireless LAN) standard can be selected from 1 ms to several tens of seconds in the ms order. However, if the beacon interval is shortened in any wireless communication standard, the beacon transmission time required for communication increases, and the period available for actual data communication is shortened. Therefore, there is a problem that although the synchronization accuracy is increased, the penalty for the transmission speed is increased.

  In order to deal with such a problem, in the present embodiment, a method of performing multiple exposures during one beacon interval will be described. Also in the fourth embodiment, the system configuration is the same as the configuration shown in FIG. The block diagram of the compare timer 800 in the same system configuration is also the same as FIG.

  FIG. 16 is a timing sequence diagram when performing a plurality of exposures within one beacon interval. It is a figure explaining an example of the timing sequence diagram concerning the 4th Embodiment of this invention. In the present embodiment, a description will be given of fluoroscopy in which exposure is performed twice during one beacon signal generation. However, the present invention can be similarly applied even when two or more exposures are performed.

  In the compare timer 800 according to the present invention, a plurality of comparison registers are provided in order to realize multiple exposures during one beacon interval as described above. Here, in the compare timer B 622, a count value corresponding to the exposure trigger offset 1601 is set in the comparison register a804. Further, a count value corresponding to a value 1602 obtained by adding a frame period 1600 to the exposure trigger offset 1601 is set in the comparison register b805. When it is desired to include three or more frames in one beacon interval, a value obtained by multiplying the frame period 1600 by a natural number is added to the exposure trigger offset 1601.

  Similarly, count values corresponding to the read trigger offset a1603 and the read trigger offset b1604 are set in the comparison register a804 and the comparison register b805 of the compare timer A612, respectively. Then, a count value corresponding to a value obtained by adding the frame period 1600 to the read trigger offset a1603 is set in the comparison register c1100. Further, a count value corresponding to a value obtained by adding the frame period 1600 to the read trigger offset b 1604 is set in the comparison register d1101.

  By performing the above settings, two frames synchronized with a single beacon signal can be executed.

  In addition, the frame rate changing process in the present embodiment is the same as that described in the second embodiment. Therefore, when this embodiment is used, the frame rate change is applied when a plurality of frames see-through synchronized with one beacon interval is completed. For this reason, a time loss until the frame rate is changed occurs. However, since the beacon interval applied in the case described in the present embodiment is usually within one second, it is not a big problem.

  As described above, in the present embodiment, it is possible to increase the time available for data transfer while realizing synchronization for each beacon between the image processing unit 620 and the sensor unit 610 by applying the present invention.

<Fifth Embodiment>
In the above embodiments, in the wireless X-ray fluoroscopy system, by matching the beacon signal between the sensor unit and the image processing unit to the frame rate, the method of realizing the timing synchronization between both units for each beacon signal. Stated. However, due to the execution of a large amount of data communication at the time of beacon transmission, the AP or PNC may not be able to transmit a beacon signal at a certain beacon interval.

  In this case, although a frame-by-frame synchronization is possible, a certain frame rate cannot be secured, and jitter occurs for each frame. In order to cope with such a problem, it is conceivable to use the IEEE 802.15.3 standard capable of time management by the TDMA method. However, there are cases where it is necessary to use a wireless communication standard that uses best-effort arbitration by the CSMA / CA method such as IEEE 802.11. In the fifth embodiment, a technique for ensuring an accurate frame rate while applying the present invention to such best effort type wireless communication such as the CSMA / CA method will be described.

  The configuration of this embodiment will be described with reference to FIG. It is a figure explaining an example of the system block diagram concerning the 5th Embodiment of this invention. In FIG. 18, common parts with FIG. 10 are given the same reference numerals, and description thereof is omitted.

  The compare timer B 622 transmits a transfer stop request signal b1820 for requesting to stop the data transfer to the wireless communication unit B621. Thereby, the data transfer is stopped. The compare timer A 612 also transmits a transfer stop request signal a 1810 requesting the wireless communication unit A 611 to stop data transfer.

  The internal configuration of the compare timer 800 in this embodiment will be described with reference to FIG. Portions common to FIG. 11 are given the same reference numerals, and description thereof is omitted. The comparison register n806 outputs a transfer stop trigger signal 1900 as a one-shot pulse output.

  The timing sequence diagram in the present embodiment will be described with reference to FIG. FIG. 17 is an example of a timing sequence diagram according to the present embodiment. Since the timing sequence is the same as that of the first embodiment described with reference to FIG. 9, differences will be mainly described.

  In the fluoroscopy in the present embodiment, as in the first embodiment, the counter 801 of the compare timer 800 is reset for each beacon signal that matches the frame period 1700, and the X-ray exposure and sensor readout timing are offset from the reset time. To control.

  Here, a count value corresponding to the transfer stop offset 1703 is set in the comparison register n806 in both the compare timers 800. The transfer cancellation offset 1703 is a value obtained by subtracting a time necessary and sufficient for the wireless communication unit B621 and the wireless communication unit A611 to cancel the ongoing wireless communication from the frame period 1700. By performing this setting, both wireless communication units 611 and 612 receive the transfer stop trigger signal 1900 from the compare timer 800 immediately before the next beacon signal 1701 is transmitted. The wireless communication unit that has received the transfer stop trigger signal 1900 immediately stops communication if wireless communication is in progress and prepares for the transmission of the beacon signal 1701.

  As described above, in this embodiment, it is possible to prevent the occurrence of jitter at the time of fluoroscopy due to other wireless communication when a beacon signal is transmitted, and to perform the timing synchronization according to the present invention at a desired frame period.

<Sixth Embodiment>
In the embodiments described above, the wireless communication unit B621 in the image processing unit 620 including the X-ray generation unit 630 has an AP or PNC function, and a beacon signal is transmitted from the wireless communication unit B621 in synchronization with the frame period. It was. However, the AP or PNC function described in the present invention is not an essential function for the wireless communication unit in the image processing unit, but exists in the wireless communication unit in the sensor unit or in a wireless communication device of a completely different unit. May be.

  In the present embodiment, a method of giving an AP or PNC function to the wireless communication unit of the sensor unit 610 and determining whether or not a beacon signal can be transmitted according to the situation of the sensor unit 610 will be described.

  A configuration diagram in the present embodiment will be described with reference to FIG. FIG. 20 is a diagram for explaining an example of a configuration diagram of the present embodiment. Portions common to FIG. 10 are assigned the same reference numerals, and descriptions thereof are omitted.

  In the present embodiment, the timing generation unit 2010 is in the sensor unit 610 and outputs a timing signal 2011 to the wireless communication unit A611. Receiving the timing signal 2011, the wireless communication unit A611 transmits a beacon signal. That is, in this embodiment, the sensor unit 610 plays the role of AP or PNC.

  A processing flow when performing fluoroscopy in the present embodiment will be described with reference to FIG. FIG. 21 is a diagram illustrating an example of a flowchart according to the present embodiment. In FIG. 21, the description of the same processing as in FIG. 13 is omitted, and only the different processing is described with reference numerals.

  Since the AP or PNC is included in the sensor unit 610, the change of the beacon interval in step 2150 is performed in the sensor unit 610.

  In step 2151, before transmitting the beacon signal, the CPU 713 of the sensor unit 610 determines whether the sensor front end 712 is reading the X-ray sensor 711 or not. When sensor reading is performed using a line buffer and read data is transmitted in units of lines, wireless communication is interrupted due to radio wave conditions or disturbance, and an error occurs and the time required for retransmission, etc. Etc. cause an increase in sensor readout time. In such a case, it is necessary to postpone the next X-ray exposure until the sensor reading is completed. Therefore, it is determined whether or not the reading is completed before the beacon transmission. When reading is incomplete, delaying the transmission of the beacon signal can prevent the next exposure from starting and destroying the read data.

  As a result of the reading state check, if the sensor is not being read, it is determined in step 2152 whether or not the beacon interval has elapsed. When the beacon interval elapses, the process proceeds to the next step. The subsequent processing is the same as described with reference to FIG.

  Similar processing is performed in step 2152 and step 2153 even when the frame rate is changed.

  As described above, in this embodiment, even if the sensor unit 610 has the role of AP or PNC, the synchronization error between the units 610 and 620 can be reduced.

[Other Embodiments]
The present invention can be applied to a system composed of a plurality of devices (for example, a host computer, an interface device, a reader, etc.) or an apparatus composed of a single device (for example, a copier). Good.

  The object of the present invention can also be achieved by supplying, to a system, a storage medium that records the code of a computer program that realizes the functions described above, and the system reads and executes the code of the computer program. In this case, the computer program code itself read from the storage medium realizes the functions of the above-described embodiments, and the storage medium storing the computer program code constitutes the present invention. In addition, the operating system (OS) running on the computer performs part or all of the actual processing based on the code instruction of the program, and the above-described functions are realized by the processing. .

  Furthermore, you may implement | achieve with the following forms. That is, the computer program code read from the storage medium is written into a memory provided in a function expansion card inserted into the computer or a function expansion unit connected to the computer. Then, based on the instruction of the code of the computer program, the above-described functions are realized by the CPU or the like provided in the function expansion card or function expansion unit performing part or all of the actual processing.

When the present invention is applied to the above storage medium, the computer program code corresponding to the flowchart described above is stored in the storage medium.
The

110 Sensor unit 120 Image processing unit 121 Timing generator 130 X-ray generation unit 131 X-ray tube 132 Collimator

Claims (7)

  A radiography system in which a radiography apparatus performs radiography based on radiation irradiated by a radiation generation apparatus,
  A transmitting means for repeatedly transmitting a synchronization signal for synchronizing the radiation generating apparatus and the radiation imaging apparatus wirelessly according to a frame period;
  A radiation sensor that is included in the radiation imaging apparatus and reads an electrical signal based on radiation in response to the synchronization signal being transmitted;
  Determining means for determining whether the radiation sensor is reading the electrical signal;
Have
  The transmission unit controls the timing of transmitting the synchronization signal based on a determination result by the determination unit.   The radiation imaging system according to claim 1, wherein the determination unit performs the determination before timing of transmitting the synchronization signal.   The transmitting means is
    When it is determined that the radiation sensor is not reading the electrical signal before the timing of transmitting the synchronization signal, the synchronization signal is transmitted wirelessly at the timing,
    3. The synchronization signal is not transmitted at the timing when it is determined that the radiation sensor is reading the electrical signal before the timing of transmitting the synchronization signal. 4. Radiography system.   4. The radiation imaging system according to claim 1, wherein the radiation imaging apparatus reads the electrical signal every time the synchronization signal is transmitted. 5.   The radiation imaging system according to claim 1, wherein the radiation imaging apparatus is operable as either an access point or a piconet coordinator.   The radiation imaging system according to claim 1, wherein the radiation imaging apparatus includes the transmission unit and the determination unit.   The radiation imaging system further includes a control device capable of wireless communication with the radiation imaging device,
  The radiation imaging apparatus includes a wireless communication unit that wirelessly transmits a radiation image based on the electrical signal to the control device,
  The controller is
    Receiving means for receiving the radiation image from the radiation imaging apparatus;
    Display control means for displaying the received radiation image on a display unit;
The radiation imaging system according to claim 1, comprising:

Images