JP2008073121A - Radiographic image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radiographic image forming apparatus which effectively reduces power consumption by monitoring the working condition of a system and by changing the working condition of a reader that consumes power the most in accordance with the monitored working condition to a low power consumption condition, that is, a standby condition or a power-off condition. <P>SOLUTION: A reader control section 80 monitors the working condition of an X-ray source 16, the reader 26 or a battery 27. For example, when such a condition as the X-ray source 16 is not arranged in a photography position, no signal is inputted into the reader 26 for a predetermined time or residual amount of the battery 27 is below a permissible range is detected, the reader control section controls a mode switching circuit 92 to turn the reader 26 into an energy-saving mode. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention includes a radiation source and a reading device that reads radiation image information recorded on a radiation conversion panel using the radiation source, and drives these devices using electric power supplied from a battery. About the system.

  For example, when a certain type of phosphor is irradiated with radiation (X-ray, α-ray, β-ray, γ-ray, ultraviolet ray, electron beam, etc.), a part of the energy of this radiation is accumulated in the phosphor, and then the fluorescence When the body is irradiated with excitation light such as visible light, stimulated emission light corresponding to the accumulated energy is output.

  An imaging apparatus that temporarily accumulates and records radiation image information of a subject such as a human body in the stimulable phosphor panel using the stimulable phosphor panel made of such a phosphor, and accumulation and storage of radiation image information Scanning phosphor panels are scanned with excitation light, and the resulting stimulated emission light is photoelectrically read to obtain an image signal, and the image signal is processed to obtain an image excellent in diagnostic suitability. .

  Note that the stimulable phosphor panel from which the radiation image information has been read can be used repeatedly by irradiating the erasing light including light in the excitation light wavelength region of the phosphor and erasing the remaining radiation image information. . Accordingly, some of the readers incorporate an erasing device that performs an erasing process by irradiating the storable phosphor panel with erasing light.

  Further, instead of the stimulable phosphor panel, radiation image information can also be obtained using a light conversion type radiation solid state detector. This light conversion type radiation solid state detector is formed by arranging a large number of solid state detection elements in a matrix, and when irradiated with radiation, an electrostatic latent image corresponding to the radiation dose is accumulated in the solid state detection elements. To be recorded. When reading the electrostatic latent image, the radiation solid detector is irradiated with reading light, and the value of the generated current is acquired as radiation image information. In this case, the radiation solid-state detector erases the radiation image information that is the remaining electrostatic latent image and reuses it by irradiating the radiation solid-state detector with the erasing light in the same manner as the stimulable phosphor panel. Can do.

  By the way, in a medical institution such as a hospital, an imaging device is usually arranged in an imaging room away from a hospital room, and a patient moves to the imaging room to perform imaging. However, some patients cannot move to the imaging room. Therefore, for such patients, portable imaging devices that perform imaging by moving the imaging device to a hospital room have been developed (see Patent Documents 1 and 2).

  The portable imaging apparatus disclosed in Patent Document 1 has a reading function of radiation image information, and drives a control unit 2 and an X-ray source 3 to which a radiation conversion panel 1 is connected as shown in FIG. A driving circuit 4 that performs the above operation and a battery 5 that supplies electric power to the driving circuit 4 are mounted on a carriage 6. The drive circuit 4 drives the X-ray source 3 to irradiate the subject 7 with X-rays, and the X-rays transmitted through the subject 7 are recorded on the radiation conversion panel as radiation image information. And the reading process of the radiographic image information recorded on the radiation conversion panel by the control part 2 is performed.

  Here, in the photographing apparatus of Patent Document 1, the rotation detection sensor 9 is disposed in the vicinity of the wheel 8 and when the rotation detection sensor detects the movement state of the apparatus, an unnecessary function related to photographing is suspended. In addition, generation of unnecessary operations due to erroneous operations and the like are suppressed, and power consumption is reduced.

  Further, in the imaging apparatus of Patent Document 2, when the AC power source is not connected, the acquired radiation image information is only stored, and image processing is not performed on the acquired radiation image information, thereby suppressing battery consumption.

JP 2006-158508 A JP 2005-27739 A

  However, in the case of Patent Document 1, it is not possible to reduce power consumption except when the photographing apparatus is moved, and since only the function related to photographing is stopped, sufficient power consumption can be reduced. Cannot be achieved.

  In the case of Patent Document 2, only image processing is not performed, and other functions of the reading apparatus are in an activated state. In this case as well, power consumption cannot be sufficiently reduced.

  The present invention has been made to solve the above-described problems, and monitors the use state of the system, and according to the use state, the reading device with the largest power consumption is in a standby state or a power-off state in which the power consumption is low. Thus, an object of the present invention is to provide a radiation image forming system capable of effectively reducing power consumption.

The radiation imaging system of the present invention includes a radiation source for irradiating a subject with radiation,
A reading device that reads the radiation image information from a radiation conversion panel in which radiation image information based on the radiation applied to the subject is recorded;
A battery for supplying power for driving the radiation source and the reader;
Monitoring means for monitoring at least one usage state of the radiation source, the reader or the battery;
In accordance with the use state, state setting means for setting the reading device to a standby state or a power-off state with low power consumption;
It is characterized by providing.

  In the radiation image forming system of the present invention, the use state of the system is monitored, and according to the use state, the reading device with the largest power consumption is put into a standby state or a power-off state where the power consumption is low, thereby reducing the power consumption. Can be reduced. This ensures a stable operating state of the portable radiation image forming system.

  FIG. 1 shows a configuration of a radiation image forming system 10 of the present embodiment. The radiation image forming system 10 is configured to be transportable to a hospital room or the like while being placed on the carriage 12.

  The cart 12 receives imaging information for imaging radiographic image information or the like, or a console 14 having a display for acquisition from the outside, and an X-ray source 16 according to the imaging information supplied from the console 14. An X-ray source control device 22 for controlling and irradiating the subject 18 with X-rays 20 and a stimulable phosphor panel P on which radiation image information is recorded by irradiating the subject 18 with X-rays 20 are housed. The cassette 24 is loaded, and the reading device 26 that reads the radiation image information from the stimulable phosphor panel P and the radiation image information read from the stimulable phosphor panel P are transmitted to the outside, while necessary information is externally transmitted. A battery for supplying power to the transmitter / receiver 28 to be acquired, the console 14, the X-ray source 16, the X-ray source control device 22, the reader 26 and the transmitter / receiver 28 7 and is placed.

  In this case, the X-ray source 16 is connected to the X-ray source control device 22 via the arm member 29. The battery 27 is connected to a charger 31 so that the battery 27 can be charged as necessary. Note that an indoor transmitter / receiver 35 that exchanges information with the transmitter / receiver 28 is disposed at an entrance 33 of a hospital room or the like into which the radiation image forming system 10 is carried.

  FIG. 2 shows the internal configuration of the reading device 26. Here, the cassette 24 loaded in the reading device 26 has a lid member 30 that can be freely opened and closed, and a barcode (not shown) in which ID information for identifying the cassette 24 is recorded.

  The reading device 26 includes a cassette loading unit 38 on the upper portion of the casing 36, and the cassette loading unit 38 is provided with a lid member 40 that is slidable in the arrow direction. The cassette 24 storing the stimulable phosphor panel P on which the radiation image information is recorded is loaded into the cassette loading unit 38 with the lid member 30 facing down.

  The cassette loading unit 38 includes a barcode reader 42 that reads a barcode attached to the cassette 24, an unlocking mechanism 46 that unlocks the lid member 30 of the cassette 24, and the stimulable phosphor panel P from the cassette 24. An adsorbing plate 48 that adsorbs and takes out and a nip roller 50 that sandwiches and conveys the stimulable phosphor panel P taken out by the adsorbing plate 48 are disposed.

  A plurality of transport rollers 52 a to 52 g and a plurality of guide plates 54 a to 54 f are arranged in series with the nip roller 50, and a curved transport path 56 is configured by these. The curved conveyance path 56 between the conveyance rollers 52c and 52d constitutes a width-shifting portion that brings the stimulable phosphor panel P in a direction perpendicular to the conveyance direction. The curved conveyance path 56 extends downward from the cassette loading unit 38, then becomes substantially horizontal at the lowermost portion, and then extends substantially vertically upward. The part extending substantially vertically upward constitutes the rear conveyance path. By configuring the curved conveyance path 56 to be curved in this way, the reading device 26 can be reduced in size.

  Between the nip roller 50 and the transport roller 52a, an erasing unit 60 for erasing the radiation image information remaining on the stimulable phosphor panel P that has been read is disposed. The erasing unit 60 has a plurality of erasing light sources 62 composed of cold cathode tubes that output erasing light.

  On the other hand, a platen roller 64 is disposed between the transport rollers 52d and 52e disposed at the lowermost portion of the curved transport path 56. A scanning unit 66 that reads radiation image information accumulated and recorded on the stimulable phosphor panel P is disposed above the platen roller 64.

  The scanning unit 66 derives a laser beam LB that is excitation light and scans the stimulable phosphor panel P in a direction orthogonal to the transport direction, and radiation emitted by being excited by the laser beam LB. A condensing guide 70 for condensing the photostimulated luminescent light associated with the image information, and a photomultiplier 72 for converting the photostimulated luminescent light collected by the condensing guide 70 into an electrical signal are provided. A condensing mirror 74 for increasing the condensing efficiency of the photostimulated luminescent light is disposed adjacent to one end of the condensing guide 70.

  FIG. 3 shows a control block of the radiation imaging system 10. Connected to the X-ray source control device 22 is an X-ray irradiation switch 76 that drives the X-ray source 16 by the operator's operation and irradiates the subject 18 with the X-ray 20.

  The reading device 26 includes a reading device control unit 80 (operation state detection means). The reader control unit 80 includes a power switch 82 of the reader 26, an X-ray source arrangement detection sensor 78 (arrangement state detection means) that detects the arrangement of the X-ray source 16 from the rotation angle of the arm member 29, and a barcode reader. 42, a scanning unit controller 84 for controlling the scanning unit 66, and an erasing unit controller 86 for controlling the erasing unit 60 are connected.

  The reader control unit 80 also includes a timer circuit 88 (input state detection means) that measures the time from when the timer is started until a signal is input to the reader 26, and the remaining battery capacity for detecting the remaining capacity of the battery 27. According to the usage state of the capacity detection sensor 90 (remaining capacity detection means) and the X-ray source 16, the reading device 26 or the battery 27, the reading device 26 is turned into the normal processing state mode, the energy saving mode (standby state), or the power is turned off. A mode switching circuit 92 (state setting means) for switching the source-source off mode is connected.

  Note that the reader control unit 80 is based on the information transmitted from the indoor transmitter / receiver 35 and detects whether or not the radiation image forming system 10 is in a region for acquiring radiation image information such as in a hospital room. Also works.

  The radiation image forming system 10 of the present embodiment is basically configured as described above. Next, the operation thereof will be described with reference to the flowcharts shown in FIGS.

  FIG. 4 is a flowchart of the first embodiment.

  First, the operator moves the radiographic image forming system 10 together with the carriage 12 to the location of the subject 18, for example, a hospital room, and then turns on all the power sources including the console 14 and the reading device 26 constituting the radiographic image forming system 10. (Step S1).

  Next, the console 14 is operated to input imaging information such as the name and imaging method of the subject 18, or the imaging information is acquired from the indoor transceiver 35 via the transceiver 28 and the radiographic image information of the subject 18 is acquired. Is selected, and a barcode attached to the cassette 24 is read to obtain ID information of the cassette 24. Thus, the shooting information and the ID information of the cassette 24 are set, and the shooting preparation is completed (step S2).

  When the preparation for imaging is completed, the cassette 24 is set to a predetermined position, and the X-ray source 16 is set to a predetermined position via the arm member 29, and then the operator operates the X-ray irradiation switch 76, the X-ray source The control device 22 drives the X-ray source 16 to irradiate the subject 18 with the X-rays 20, and X-ray imaging is performed (step S3). The X-rays 20 that have passed through the subject 18 are irradiated onto the stimulable phosphor panel P housed in the cassette 24, and radiation image information is accumulated and recorded.

  Next, a cassette 24 that houses the stimulable phosphor panel P on which the radiation image information is recorded is loaded into the reader 26, and the radiation image information is read and erased (step S4).

  That is, when the cassette 24 is loaded in the cassette loading unit 38 of the reading device 26 with the lid member 30 facing down, the barcode reader 42 reads the barcode of the cassette 24 and ID information of the cassette 24 is acquired. Next, after the lid member 30 is unlocked by the lock release mechanism 46 and the lid member 30 is opened, the stimulable phosphor panel P is adsorbed and taken out by the suction disk 48 and supplied to the nip roller 50. The nip roller 50 sandwiches the stimulable phosphor panel P and supplies it to the curved conveyance path 56. Conveying rollers 52a to 52g constituting the curved conveying path 56 convey the stimulable phosphor panel P.

  The stimulable phosphor panel P is sub-scanned and transported between the transport rollers 52d and 52e, and the laser beam LB from the excitation unit 68 performs main scanning on the stimulable phosphor panel P, so that radiation image information is read. Is called. That is, when the stimulable phosphor panel P is irradiated with the laser beam LB output from the excitation unit 68, the stimulable phosphor light corresponding to the radiation image information is output from the stimulable phosphor panel P. This stimulated emission light is guided to the photomultiplier 72 through the light collecting guide 70 and converted into radiation image information as an electrical signal. The read radiographic image information is stored in a storage means (not shown) together with the ID information of the cassette 24 or is transmitted from the transceiver 28 to the indoor transceiver 35 via the console 14.

  The stimulable phosphor panel P from which the radiation image information has been read is once transported to the guide plate 54 f side, and then returned to the cassette loading unit 38 side again via the lower part of the scanning unit 66. The stimulable phosphor panel P returned to the cassette loading unit 38 side is stored with the stimulable fluorescence by the erase light output from the erase light source 62 constituting the erase unit 60 disposed between the nip roller 50 and the transport roller 52a. The radiation image information remaining on the body panel P is removed.

  The storable phosphor panel P, for which the remaining radiation image information has been erased, is housed in the cassette 24 using the nip roller 50 and the suction plate 48 and the lid member 30 is closed, and then used for the next imaging. The

  If there is another imaging process in the hospital room, the processes in steps S2 to S4 are repeated (step S5).

  On the other hand, when the round-trip imaging process in the hospital room is completed, the operator transports the radiation image forming system 10 from the entrance 33 to the outside and moves to another hospital room. At this time, the reader control unit 80 detects that the radiographic image forming system 10 has moved to the outside of the hospital room based on the information received from the indoor transceiver 35 via the transceiver 28 (step S6). The mode switching circuit 92 is controlled to switch the reading device 26 to the energy saving mode (step S7). As a result, power consumption by the reading device 26 with large power consumption is suppressed, and power consumption of the battery 27 can be minimized.

  The reading device 26 may be set in the energy saving mode, and other unnecessary devices such as a display power source of the console 14 may be turned off. If the time required for restarting the reading device 26 does not matter, the power source of the reading device 26 may be completely turned off.

  When the rounds in all the hospital rooms are completed (step S8), the operator turns off all the power sources of the radiation image forming system 10 to complete the operation (step S9).

  On the other hand, when there is a hospital room that needs to be visited, the radiographic image forming system 10 is transported into the hospital room via the entrance 33. At this time, the reader control unit 80 acquires information from the indoor transmitter / receiver 35 via the transmitter / receiver 28, thereby detecting that the radiographic image forming system 10 has moved into the hospital room (step S10), and mode switching. The circuit 92 is controlled to switch the reading device 26 to a normal mode in which reading and erasing processing is possible, or the power switch 82 is controlled to turn on the reading device 26 (step S11). Then, the processing from step S2 is repeated.

  FIG. 5 is a flowchart of the second embodiment.

  First, after moving the radiographic image forming system 10 to a hospital room, the operator turns on all the power sources of the radiographic image forming system 10 excluding the reading device 26 (step S21).

  Next, preparation for photographing is performed in the same manner as in step S2 of the first embodiment (step S22), and when the preparation for photographing is completed, a trigger signal is generated (step S23). Is turned ON (step S24). Thereby, the startup process of the reading device 26 is started. The trigger signal may be generated according to the operation of the X-ray irradiation switch 76 by the operator.

  Next, after driving the X-ray source 16 to perform X-ray imaging of the subject 18 (step S25), the cassette 24 containing the stimulable phosphor panel P is loaded into the reader 26, and the radiographic image information is stored. Read / erase processing is performed (step S26). In this case, since the power of the reading device 26 is already turned on, the reading / erasing process can be performed promptly.

  When the reading and erasing process of the stimulable phosphor panel P is completed, the reader control unit 80 generates a trigger signal and outputs it to the mode switching circuit 92 (step S27). The mode switching circuit 92 turns off the power of the reading device 26 according to the trigger signal (step S28). As a result, unnecessary power consumption by the reading device 26 can be suppressed. If there is a next shooting, the processing from step S22 is repeated.

  Note that instead of turning off the power of the reading device 26 in step S28, it may be switched to the energy saving mode.

  FIG. 6 is a flowchart of the third embodiment.

  The operator moves all the power sources to ON after moving the radiation image forming system 10 to the hospital room (step S31).

  Next, the reader control unit 80 drives the timer circuit 88 to start timing and performs timer monitoring (step S32).

  Therefore, the reading device control unit 80 monitors whether or not a signal is input to each unit of the reading device 26 and from the outside to the reading device 26 (step S33). For example, an operation instruction signal input to the reading device 26 via the console 14, an X-ray imaging signal from the X-ray source control device 22, a signal for detecting that the cassette 24 is loaded in the cassette loading unit 38, and scanning The presence / absence of signals from the unit control unit 84 and the erasing unit control unit 86 is monitored.

  If the signal non-input time counted by the timer circuit 88 is not equal to or longer than the predetermined set time (step S34), the reader control unit 80 continues the power-on state of the reader 26.

  On the other hand, when the signal non-input time becomes equal to or longer than the predetermined set time, the reader control unit 80 determines that the reader 26 is not used for a long time, and controls the mode switching circuit 92 to control the reader 26. Is switched to the energy saving mode (step S35).

  If a signal is input in step S33, the reading device control unit 80 resets the timer circuit 88 (step S36), and then controls the mode switching circuit 92 to immediately read and erase the state of the reading device 26. The mode is switched to the normal mode that can perform (step S37).

  The above processing is repeated until the processing by the radiation image forming system 10 is completed (step S38).

  FIG. 7 is a flowchart of the fourth embodiment.

  The operator moves all the power sources to ON after moving the radiation image forming system 10 to the hospital room (step S41).

  Next, in the same manner as in steps S2 to S4 of the first embodiment, after preparing for imaging (step S42), the cassette 24 is set and X-ray imaging is performed (step S43), and recording of radiation image information is performed. The stored stimulable phosphor panel P is loaded into the reading device 26 together with the cassette 24, and a reading and erasing process is performed (step S44).

  Next, the reader control unit 80 confirms the imaging state of the X-ray source 16 using the X-ray source arrangement detection sensor 78 (step S45). When the position of the arm member 29 that supports the X-ray source 16 detected by the X-ray source arrangement detection sensor 78 is set to a radiographable state, the reader control unit 80 performs radiographic image information imaging processing and subsequent processing. It is determined that the reading and erasing process is continued, and the process from step S42 is repeated while the power of the reading device 26 is kept ON.

  On the other hand, when the folded state of the arm member 29 is detected, the reader control unit 80 determines that the imaging by the X-ray source 16 is not performed, and turns off the power of the reader 26 ( Step S46).

  Next, the radiation image forming system 10 is moved (step S47), and the position detection of the arm member 29 by the X-ray source arrangement detection sensor 78 is continued (step S48), and the X-ray source 16 is again set in a radiographable state. If it is confirmed that the power is supplied to the reading device 26 (step S49), the processing from step S41 is repeated.

  As in the case of the second embodiment, instead of turning off the power of the reading device 26 in step S46, it may be switched to the energy saving mode.

  FIG. 8 is a flowchart of the fifth embodiment.

  The operator moves all the power sources to ON after moving the radiographic image forming system 10 to the hospital room (step S51).

  Next, in the same manner as in steps S2 to S4 of the first embodiment, after preparing for imaging (step S52), the cassette 24 is set and X-ray imaging is performed (step S53), and recording of radiographic image information is performed. The stored stimulable phosphor panel P is loaded into the reading device 26 together with the cassette 24, and a reading / erasing process is performed (step S54).

  Here, when all the processes are finished (step S55), all the power sources of the radiation image forming system 10 are turned off, and the work is finished (step S56).

  On the other hand, when the processing is continued (step S55), the reading device control unit 80 checks the remaining capacity of the battery 27 detected by the battery remaining capacity detection sensor 90 (step S57), and the remaining capacity is a radiation image formation. If it is not below the lower limit value at which the system 10 operates normally (step S58), the processing from step S52 is continued.

  On the other hand, when the remaining capacity of the battery 27 is equal to or lower than the lower limit value (step S58), the reading device control unit 80 controls the mode switching circuit 92 to switch the reading device 26 to the energy saving mode, or the power supply of the reading device 26 Is turned off (step S59), the battery 27 is instructed to be charged. The charging instruction can be displayed on the console 14 or notified to the worker with a warning sound.

  When charging is instructed, the operator performs charging by connecting the charger 31 to an AC power source (step S60), and after charging is completed (step S61), the operator controls the mode switching circuit 92 to read the reader 26. Is switched to the normal mode (step S62), and the processing from step S52 is repeated.

  In addition, this invention is not limited to embodiment mentioned above, Of course, it can change freely in the range which does not deviate from the main point of this invention.

It is a block diagram of the radiographic image forming system of this embodiment. It is an internal block diagram of a reader. It is a control block diagram of a radiographic image forming system. It is an operation | movement flowchart of 1st Embodiment. It is an operation | movement flowchart of 2nd Embodiment. It is an operation | movement flowchart of 3rd Embodiment. It is an operation | movement flowchart of 4th Embodiment. It is an operation | movement flowchart of 5th Embodiment. It is structure explanatory drawing of the portable imaging device concerning a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Radiation image forming system 12 ... Dolly 14 ... Console 16 ... X-ray source 18 ... Subject 20 ... X-ray 22 ... X-ray source control device 24 ... Cassette 26 ... Reading device 27 ... Battery 28 ... Transmitter / receiver 35 ... Indoor transmitter / receiver DESCRIPTION OF SYMBOLS 60 ... Erase unit 66 ... Scanning unit 76 ... X-ray irradiation switch 78 ... X-ray source arrangement detection sensor 80 ... Reading device control part 82 ... Power supply switch 84 ... Scanning unit control part 86 ... Erase unit control part 92 ... Mode switching circuit P ... Storage phosphor panel

Claims (7)

A radiation source for irradiating the subject with radiation;
A reading device that reads the radiation image information from a radiation conversion panel in which radiation image information based on the radiation applied to the subject is recorded;
A battery for supplying power for driving the radiation source and the reader;
Monitoring means for monitoring at least one usage state of the radiation source, the reader or the battery;
In accordance with the use state, state setting means for setting the reading device to a standby state or a power-off state with low power consumption;
A radiation image forming system comprising: The system of claim 1, wherein
The system is configured to be movable while the radiation source, the reader, and the battery are placed on a carriage. The system according to claim 1 or 2,
The monitoring means is composed of an arrangement state detection means for detecting the arrangement state of the radiation source,
The state setting means is a standby state or a power source that reduces power consumption when the arrangement state detecting means detects that the arrangement state of the radiation source is set to a position where the radiation source is not irradiated. A radiation imaging system characterized by being set to an off state. The system according to claim 1 or 2,
The monitoring means is composed of area detection means for detecting whether or not the system is in an area for acquiring the radiation image information,
The state setting means sets the reading apparatus to a standby state or a power-off state with low power consumption when the area detecting means detects that the system is out of the area. Image forming system. The system according to claim 1 or 2,
The monitoring means is composed of an operation state detection means for detecting an operation state of the reading device,
The state setting means sets the reading apparatus to a standby state or a power-off state where the power consumption is low when the operation state detecting means detects the end of the operation of the reading apparatus. system. The system according to claim 1 or 2,
The monitoring means comprises input state detection means for detecting an input state of a signal to the reading device,
The state setting means sets the reading apparatus to a standby state or a power-off state in which the power consumption is low when the input state detection means does not detect the input of a signal for a predetermined time or longer. Forming system. The system according to claim 1 or 2,
The monitoring means is composed of remaining capacity detecting means for detecting the remaining capacity of the battery,
The state setting means sets the reading apparatus to a standby state or a power-off state where the power consumption is low when the remaining capacity detecting means detects that the remaining capacity is equal to or less than a predetermined amount. Radiation imaging system.

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