JP2014171551A - Radiography control apparatus, x-ray photographing apparatus, and control method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a user properly notified of the timing of an exposure instruction according to a photographing mode.SOLUTION: An X-ray photographing apparatus includes an X-ray detector for detecting X rays emitted from an X-ray source. The X-ray detector has a plurality of driving states including a photographing preparation state for initializing a photoelectric conversion element, a photography permission state for inhibiting the initialization and waiting for an instruction to start photographing, and a photographing state. A drive control unit causes the driving state of the X-ray detector to transition according to the photographing mode selected from among a plurality of photographing modes each having a different combination of the driving state of the X-ray detector and a period in which exposure operation of the user is permitted. A notification unit notifies whether or not the driving state of the X-ray detector is in an exposure-permitted period in the driving state transition according to the selected photographing mode.

Description

  The present invention relates to a radiation imaging control apparatus, an X-ray imaging apparatus, and a control method thereof using a radiation detector that can convert an X-ray image into a digital output in real time.

  Used as an X-ray detector to obtain an X-ray image of the examiner during X-ray imaging, in film / screen systems (hereinafter referred to as F / S) with a film and intensifying screen sandwiched between cassettes and computed radiography. There is an Imaging Plate (IP) in the cassette. These types of X-ray detectors do not need to be synchronized with the X-ray generation timing, and the photographer only looks at the state of the examiner's breathing state, movement, etc., and the X-ray image is free from blur due to organ or body movements. Can be obtained. Therefore, the X-ray generator is configured to irradiate X-rays with a delay within several tens of ms to several hundreds ms at the latest after the X-ray irradiation button is pressed.

  In recent years, an X-ray detector that can directly convert an X-ray image into a digital output in real time has been proposed. Such an X-ray detector is, for example, a solid-state photodetector in which an amorphous semiconductor is sandwiched on a substrate made of quartz glass, and solid-state photodetection elements made of a transparent conductive film and a conductive film are arranged in a matrix, Is laminated with a scintillator that converts visible light into visible light. A detector that directly acquires X-rays with a solid-state photodetector without using a scintillator has also been proposed.

An X-ray detector capable of real-time digital output is described in Patent Document 1, and an X-ray digital image is acquired through the following process.
(1) By irradiating the X-ray detector with X-rays that have passed through the object, the X-rays are converted into visible light by a scintillator, and the visible light is detected as an electrical signal by the photoelectric conversion unit of the solid-state photodetector. The
(2) This electric signal is read out from each solid-state photodetecting element by a predetermined reading method, and an X-ray image signal is obtained by A / D converting the electric signal.

Since these X-ray detectors detect the X-ray intensity as a charge amount, the following driving is required to acquire an X-ray image.
(1) Discharge of charges in the pixel for accurately storing the X-ray detection signal.
(2) Idling for stabilizing the potential between pixels.
(3) Accumulation of charges for accumulating X-ray detection signals and reading of charges in pixels.

  In the above-described cycle, the state in which charges can be accumulated by the X-ray detector is (3), and the imaging time is limited in terms of time. Therefore, it is necessary to synchronize the X-ray generator and the X-ray detector so that X-rays are emitted in a state where the X-ray detector can be accumulated. In order to realize such synchronization, a separate synchronization signal line is prepared to synchronize the X-ray generator and the X-ray detector. Patent Document 2 describes an X-ray imaging apparatus that synchronizes an X-ray generator and an X-ray detector by detecting X-rays emitted from an X-ray source. Such a configuration eliminates the need for signal lines for synchronization and control using the signal lines.

JP-A-8-116044 JP 2005-13272 A

As an imaging mode for synchronizing the imaging operation of the X-ray detector and the exposure timing of the X-ray generator,
An imaging mode in which imaging is performed by synchronizing the X-ray detector and the X-ray generator by communication of signals in response to pressing of the exposure button;
An imaging mode in which imaging is performed by synchronizing the X-ray detector by detecting X-rays emitted from the X-ray generator;
There are imaging modes in which the X-ray detector is driven manually, and the X-ray generator performs exposure at the timing when the X-ray detector is ready to accumulate charges.

  Further, there is a case where imaging is performed while switching between a plurality of imaging modes as described above with one X-ray detector. However, the exposure timing of the X-ray generator varies with the operation state of the X-ray detector for each imaging mode. Therefore, when using while switching between a plurality of imaging modes, the user needs to be aware of the relationship between the operation state of the X-ray detector and the exposure timing for each imaging mode, and to the user when performing X-ray imaging. There is a problem that the burden of the increase.

  In addition, as described above, since the combination of the X-ray detector driving state and the exposure permission period differs depending on the imaging mode, if the user misidentifies the imaging mode in operation, it is outside the filmer permission period. There is a possibility of directing exposure. Therefore, the possibility of erroneous exposure is increased, which is not preferable from the viewpoint of safety.

  SUMMARY An advantage of some aspects of the invention is that it is possible to appropriately notify a user of an exposure instruction timing according to a shooting mode.

In order to achieve the above object, an X-ray imaging apparatus according to an aspect of the present invention has the following arrangement. That is,
A plurality of driving states including a state of preparation for photographing for executing initialization processing of the photoelectric conversion element, a state of photographing permission for prohibiting the initialization processing and waiting for a photographing start instruction, and a state during photographing; An X-ray detector for detecting X-rays emitted from a radiation source;
Driving to change the driving state of the X-ray detector according to an imaging mode selected from a plurality of imaging modes in which the combination of the driving state of the X-ray detector and the period during which the user's exposure operation is permitted Control means;
Informing means for informing whether or not the driving state of the X-ray detector is in a period during which the exposure is permitted in the transition of the driving state according to the selected imaging mode.

  According to the present invention, it is possible to appropriately notify the user of the timing of the exposure instruction according to the imaging mode, the burden on the user when performing X-ray imaging can be reduced, and erroneous exposure can be prevented. I can do it.

The block diagram which shows the structural example of an X-ray imaging apparatus. The state transition diagram which shows the transition of the drive state of the X-ray detector in a 1st imaging | photography mode. The state transition diagram which shows the transition of the drive state of the X-ray detector in 2nd imaging | photography mode. The state transition diagram which shows the transition of the drive state of the X-ray detector in 3rd imaging mode. The figure showing the state transition of alerting | reporting according to imaging | photography mode and the state of an X-ray detector.

  Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[First embodiment]
FIG. 1 is a diagram illustrating a configuration example of an X-ray imaging apparatus 10 that is an example of a radiation imaging apparatus that captures a radiographic image using radiation. As shown in FIG. 1, an X-ray imaging apparatus 10 includes an X-ray generation apparatus 100 that is an example of a radiation source, an exposure switch 102, an X-ray detector 103 that is an example of a radiation detection unit, and a radiography control apparatus. The detector control device 105 and the notification unit 110 are examples. The notification unit 110 is an example of a display unit whose display is controlled so as to display the state of the radiation detection apparatus, and performs notification (display) using light, an image, sound, or the like.

  The X-ray generator 100 has an X-ray tube 101 as an X-ray source, and controls X-ray exposure according to the operation of the exposure switch 102. The X-ray generation apparatus 100 and the X-ray detector 103 can communicate with each other to notify both states in order to realize synchronization for imaging. In the present embodiment, the X-ray generator 100 and the X-ray detector 103 are configured to communicate with each other via the data communication repeater 106 of the detector control device 105. It is good also as a structure which communicates directly between the detectors 103. FIG. The communication path between the X-ray generator 100 and the exposure switch 102 and the communication path between the X-ray generator 100 and the X-ray detector 103 may be either wired or wireless. However, if wireless communication is employed, operability can be improved by eliminating the communication cable. The X-ray generator 100 can select a case where exposure is performed using a signal from only the exposure switch 102 and a case where exposure is permitted by combining the signal from the exposure switch 102 and the state signal from the X-ray detector 103. Operation according to a plurality of photographing modes described later is possible.

  The X-ray detector 103 has a photoelectric conversion element (not shown), and acquires an X-ray image by being exposed to X-rays. The photoelectric conversion element may be one that accumulates charges according to the light of the scintillator that emits light in response to X-ray irradiation, or one that accumulates charges according to the irradiated X-ray dose (via a scintillator). It is also possible to detect X-rays directly. The X-ray detector 103 communicates with the X-ray generator 100, the notification unit 110, and the control terminal 107 via the data communication repeater 106 of the detector controller 105. Of course, the X-ray detector 103 may communicate directly with the X-ray generator 100, the notification unit 110, and the control terminal 107 without going through the data communication repeater 106. The communication path between the X-ray detector 103 and the X-ray generator 100, the notification unit 110, and the control terminal 107 may be either wired or wireless. If wireless communication is employed, operability can be improved by eliminating cables.

  In the above configuration, the X-ray detector 103 can receive a signal indicating that X-ray generation preparation is complete from the X-ray generator 100. In addition, the X-ray detector 103 can transmit a signal indicating that X-ray reception is possible to the X-ray generator 100. The X-ray detector 103 includes an X-ray detector 104 and can determine whether or not X-rays are emitted.

  The exposure switch 102 is a switch for the user to perform an operation related to exposure of the X-ray generation apparatus 100. The exposure switch 102 includes a first switch that causes the X-ray tube 101 to prepare for X-ray generation and a second switch that permits exposure. The exposure switch 102 may have other functions such as a function as a forced synchronization switch. As a result, one function of the control terminal can be reduced.

  For example, the notification unit 110 has a notification function using light and sound and a volume adjustment function. In the present embodiment, light and sound are used as the notification form, but other notification forms such as vibration, temperature change and shape change, and combinations thereof may be used. The volume adjustment function is a function of adjusting the light amount (brightness) and volume output from the notification unit 110 and may be operated from the control terminal 107 of the detector control device 105. In the present embodiment, the notification unit 110 itself does not have a notification pattern and performs a notification operation as instructed by an input signal, but is not limited thereto. For example, the notification unit 110 itself may store a plurality of notification patterns and execute notifications of various patterns according to commands of the detector control device 105. The notification unit 110 receives signals from the control terminal 107 of the X-ray detector 103 and the detector control device 105 via the data communication repeater 106, and performs notification according to the received signal. The notification unit 110 generates a startup sound at a set volume when the system is started up. As a result, the user can confirm the size of the set volume, and can set an appropriate volume according to the situation in which the system is used. In addition, the notification unit 110 transmits and receives data for confirming the communication state with the control terminal 107 at regular time intervals. Here, if the signal from the control terminal 107 or the like is interrupted for a certain period of time or longer, it is switched to notify that it cannot be automatically exposed. Accordingly, it is possible to prevent a false notification that the user continues to be notified that the exposure is possible even though the exposure is not possible.

  The detector control device 105 includes a control terminal 107 and a data communication repeater 106. The detector control device 105 relays communication between the X-ray generator 100, the X-ray detector 103, the notification unit 110, and the control terminal 107 using the data communication repeater 106. As described above, each communication path may be either wired or wireless. The control terminal 107 includes a mode operation unit 109 that switches the imaging mode of the X-ray detector 103 and a synchronization operation unit 108 that forcibly synchronizes the X-ray generator 100 and the X-ray detector 103.

  In the present embodiment, the X-ray detector 103 operates in accordance with a program or the like recorded therein, and the drive control described below is realized. However, the X-ray detector 103 may be configured to simply move as instructed by the control terminal 107. For example, as will be described below, in this embodiment, the X-ray detector 103 determines whether or not to execute state transition, but the detector control device 105 is driven by the X-ray detector 103 in accordance with the imaging mode. May be instructed. Similarly, the notification unit 110 and the X-ray generation apparatus 100 may be configured to move according to instructions from the control terminal 107. In this way, if all the operations are instructed from the control terminal 107, the entire command system is consolidated in one place, improving maintainability and reducing the weight and size of equipment other than the detector control device 105. Leads to cost reduction. Also, if all communications are made wireless in this embodiment, portability is improved and usage is expanded.

  Under the control of the detector control device 105, the X-ray detector 103 waits for an imaging start instruction while prohibiting the initialization process and the initialization process including the initialization process including the refresh operation of the photoelectric conversion element. A plurality of driving states including a photographing permission state and a photographing state are transited. These driving states will be described later with reference to FIGS. Further, the X-ray imaging apparatus 10 of the present embodiment can operate in a plurality of imaging modes in which the driving state of the X-ray detector 103 is different, and these imaging modes are the driving state and the user exposure. The combinations with the period during which the operation is permitted are different from each other. In the present embodiment, the case of having the following three shooting modes will be described, but the number of shooting modes may be two or more, and the types of shooting modes are not limited to those exemplified below.

  In the first imaging mode (synchronous imaging mode), the X-ray detector 103 and the X-ray generator 100 are synchronized with the input of the exposure switch 102 as a trigger, so that each other is ready for imaging and exposure preparation timing. To change the driving state. For example, when the exposure button is pressed while the X-ray detector 103 is in the imaging standby state, the X-ray detector 103 enters the X-ray accepting state, and a signal indicating that the X-ray detector 103 can accept is sent to the X-ray generator 100. X-rays are emitted and X-ray imaging is performed. Thus, in the first imaging mode, imaging can be performed whenever the exposure switch 102 is operated as long as the X-ray detector 103 is in the imaging preparation state (imaging standby state).

  Therefore, in the first shooting mode, the notification unit 110 can start shooting from when it is ready for shooting and can start shooting until shooting is started or shooting is disabled to stop shooting. Keep informed that there is. The notification method may be any on / off notification as long as it can clearly indicate whether or not photography is possible (whether or not it is within the permission period for permitting the exposure operation).

  In the first shooting mode as described above, it is possible to stably acquire a high-quality image. In addition, if there is no signal from the X-ray detector 103, the risk of erroneous exposure can be reduced by preventing the X-ray generator 100 from coming out of the exposure, so that highly safe imaging processing can be performed. However, a configuration for performing communication for synchronizing the X-ray generator 100 and the X-ray detector 103 is required.

  In the second imaging mode (asynchronous imaging mode), the X-ray detector 103 detects the X-rays emitted from the X-ray tube 101, so that the X-ray generator 100 and the X-ray detector 103 perform imaging. Synchronize the operation. Therefore, in the second imaging mode, communication for synchronization between the X-ray generator 100 and the X-ray detector 103 is not required, that is, imaging without a synchronization signal is performed.

  In the second imaging mode, the X-ray detector 103 is always in an imaging-permitted state (initialization is prohibited and idle reading is continuously executed), and the X-ray detection unit 104 detects X-ray irradiation. Thus, shooting is performed. Therefore, one X-ray detector 103 can correspond to a plurality of different types of X-ray generators 100. In addition, since synchronization by an electrical signal is not performed, it is possible to use an X-ray generator used in a film cassette. The second photographing mode is characterized in that photographing can be performed almost any time since it is in a photographing permission state except for a period during which preparation for photographing is performed in order to perform refresh. However, the X-ray output method differs depending on the type of the X-ray tube 101, and depending on the output method, it may be difficult to perform imaging without synchronization as in the second imaging mode.

  In the second shooting mode, the notification unit 110 performs exposure for a period from when the shooting is disabled or the shooting preparation state is changed to the shooting permission state until the shooting preparation state or shooting state is reached. Notify as permission period. Thereby, the timing which a user's exposure operation is possible can be shown to a user more clearly. In the present embodiment, the period in which photographing is permitted (capable time for photographing) is set to a fixed time, and the presentation is also made so that the user can determine the passage of the fixed time and the remaining time. For example, the elapsed time is notified using a different sound or a sound generation pattern depending on the remaining time. Thereby, the user's work efficiency and the risk of erroneous exposure can be further reduced.

  In the third imaging mode (manual synchronization imaging mode), the X-ray generator is instructed by instructing X-ray irradiation by the X-ray tube 101 after the user shifts the X-ray detector 103 to the imaging state. 100 and the X-ray detector 103 are synchronized in operation for imaging. The X-ray detector 103 performs an imaging operation in accordance with the elapse of a set time after an external instruction is given. According to such a third imaging mode, even an X-ray tube that is difficult to image in the second imaging mode can be imaged without using communication for synchronization. In the third imaging mode, the user forcibly places the X-ray detector 103 in the imaging state (X-ray reception state). At that time, since the X-ray detector 103 has a predetermined time during which the imaging state can be maintained, it is necessary to perform X-ray exposure while the imaging state is maintained.

  Therefore, in the third shooting mode, the notification unit 110 clearly indicates to the user the period from when the shooting state is reached until the state ends. By such notification, erroneous erroneous exposure can be prevented, and the timing of the start of exposure and the period during which exposure can be clarified make it possible to capture more reliably.

  Hereinafter, the transition of the driving state of the X-ray detector 103 and the notification operation by the notification unit 110 in each imaging mode will be described in detail with reference to FIGS. 2 shows the transition of the driving state in the first photographing mode, FIG. 3 shows the transition of the driving state in the second photographing mode, FIG. 4 shows the transition of the driving state in the third photographing mode, and FIG. The notification operation by the unit 110 will be described.

  The state transition of the X-ray detector 103 in the first imaging mode will be described with reference to FIG. Since the operation in each state is slightly different for each shooting mode, a detailed description will be given for each shooting mode.

  The power OFF (S200) is a state in which the power is not turned on. When the power is turned on to the X-ray detector 103, the X-ray detector 103 shifts to a state in which imaging is not possible (S201). The state in which imaging is not possible (S201) is a state in which the power is turned on but the X-ray detector 103 is not ready for X-ray reception (such as dark current refreshing) and is not ready. Indicates that the image cannot be captured.

  Subsequently, the X-ray detector 103 is ready for imaging (S202), and the X-ray detector 103 is kept ready for imaging. In preparation for imaging, an operation for removing dark current and the like are performed. By repeating this state, the X-ray detector 103 always maintains a state in which imaging can be performed.

  The photographing permission 203 is described in detail in the photographing mode because the state slightly differs depending on the photographing mode.

  During imaging 204, the operation of removing the accumulated charges by the X-ray detector 103 is stopped, and when X-rays hit, the charge accumulates, and when X-rays hit, an image is acquired.

  Switching between various shooting modes is possible when shooting is not possible.

  In the present embodiment, the notification unit 110 does not notify the imaging mode or the operation state of the sensor, but notifies the timing when the user can operate the exposure switch 102 to cause the X-ray generation apparatus 100 to perform the exposure process. To be controlled.

Description of Operation in First Imaging Mode (FIG. 2) As described above, in the first imaging mode, the X-ray generator 100 and the X-ray detector 103 are synchronized to prepare the X-ray detector 103, Synchronous shooting is performed in which shooting is performed in accordance with the exposure timing of the generator 100.

  The power OFF (S200) state is a state in which the power is not turned on. When the X-ray detector 103 is turned on, the X-ray detector 103 transitions to a state in which imaging is not possible (S201). Imaging not possible (S201) is a state in which the power is turned on but the X-ray detector 103 is not ready for X-ray reception (such as refreshing of dark current) and is not ready. Shooting is impossible.

  In the state where imaging is not possible (S201), the X-ray detector 103 does not operate unless there is an instruction to start imaging driving from the control terminal 107. In this state, the X-ray generator 100 does not perform X-ray exposure even if it receives a signal from the exposure switch 102. Further, the control terminal 107 indicates that photographing is not possible when the state is switched from the power-off state (S200), photographing preparation (S202), and photographing state (S204) to the photographing impossible state (S201). Therefore, the notification unit 110 is turned off (FIG. 5). The user can recognize that shooting is currently impossible by turning off the notification unit 110. Further, it can be confirmed also on the control terminal 107 that photographing is currently impossible. Further, during the shooting disabled state (S201), the mode operation unit 109 of the control terminal 107 can be switched between the first, second, and third shooting modes.

  When the X-ray detector 103 receives an instruction to start imaging driving from the control terminal 107 in the imaging disabled state (S201), the X-ray detector 103 transitions to imaging preparation (S202). On the other hand, the X-ray detector 103 transitions to power OFF (S200) when power supply is stopped (when the power is turned OFF) in a state where imaging is not possible (S201). In the imaging preparation state (S202), the X-ray detector 103 periodically performs driving (refreshing) to remove the charges that are naturally accumulated. The notification unit 110 is in a first imaging mode and indicates that an exposure operation is possible when the imaging unit 110 transitions from the imaging impossible state (S201) to the imaging preparation (S202) state. Is output (FIG. 5). With this first notification light, the user can confirm that the shooting mode is the first shooting mode and that shooting is currently possible. Further, the user can confirm that the current photographing is also possible on the control terminal 107.

  When the X-ray generator 100 receives an input of the first switch of the exposure switch 102, the X-ray generator 100 transmits an X-ray generation preparation signal from the X-ray generator 100 to the X-ray detector 103 and exposes the X-ray tube 101. Start the preparation operation. When the X-ray generator 100 receives an input of the second switch following the input of the first switch of the exposure switch 102, the X-ray generator 100 transmits an X-ray exposure signal to the X-ray detector 103, and the X-ray detector 103. X-ray irradiation is executed in accordance with the exposure permission from. Further, the X-ray generation apparatus 100 transmits an X-ray generation preparation cancellation signal to the X-ray detector 103 when the input of the first switch of the exposure switch 102 is lost.

  The driving state of the X-ray detector 103 transitions to a state where imaging is not possible (S201) when an instruction to stop imaging driving is given from the control terminal 107 in the state of imaging preparation (S202). In addition, when an X-ray generation preparation signal is received from the X-ray generation apparatus 100 in the imaging preparation (S202) state, the driving state of the X-ray detector 103 transitions to an imaging permission (S203) state. In the state of imaging permission (S203), the X-ray detector 103 maintains a state in which imaging of an image can be started upon receiving an X-ray exposure signal. In this state, the X-ray detector 103 continues to perform driving (empty reading) to remove charges accumulated in the sensor. Further, during the photographing permission (S203) state, the control terminal 107 maintains the first notification light to indicate that the notification unit 110 is capable of photographing (FIG. 5). Further, as described above, it can be confirmed that the control terminal 107 is currently capable of photographing.

  When the X-ray detector 103 receives an X-ray generation preparation cancellation signal from the X-ray generator 100 in the imaging permission state (S203), the X-ray detector 103 transitions to the imaging preparation state (S202). In addition, when the X-ray detector 103 receives an X-ray exposure signal from the X-ray generator 100 in the imaging permission state (S203), the X-ray detector 103 transitions to the imaging state (S204).

  In the imaging state (S204), the X-ray detector 103 performs an X-ray image acquisition operation. At this time, an exposure permission signal is output from the X-ray detector 103, and the X-ray generation apparatus 100 emits X-rays according to the exposure permission signal. When the state transition is made from the photographing permission state (S203) to the photographing state (S204), the notification unit 110 is turned off to indicate that photographing is impossible. The control terminal 107 displays during shooting, and displays the shot image when shooting is completed. When the imaging is completed, the X-ray detector 103 returns from the imaging state (S204) to the imaging disabled state (S201), and the control terminal 107 turns off the notification unit 110.

Explanation of Operation in Second Imaging Mode In the second imaging mode, the X-ray generator 100 and the X-ray detector 103 are asynchronous, and the X-ray detector 103 is irradiated with X-rays by the X-ray detector 104. It is detected that the camera is in the middle of shooting. Hereinafter, a series of drive state transitions in the second imaging mode will be described with reference to the state transition diagram of FIG.

  The conditions for transitioning to the power-off (S200) state and the imaging disabled (S201) state are the same as in the first imaging mode (FIG. 2). When the X-ray detector 103 receives an instruction to start imaging driving from the control terminal 107 in the imaging disabled state (S201), the X-ray detector 103 transitions to the imaging permission (S203) state.

  In the second imaging mode, the X-ray generator 100 starts an exposure preparation operation for the X-ray tube 101 when receiving an input of the first switch of the exposure switch 102. When the preparation for exposure of the X-ray tube 101 is completed, the X-ray generator 100 is ready to accept the input of the second switch of the exposure switch 102. When receiving the input of the second switch, the X-ray generation apparatus 100 executes X-ray exposure from the X-ray tube 101. Note that if the input of the first switch disappears before the input of the second switch of the exposure switch 102 is received, the X-ray generator 100 cancels the preparation for exposure of the X-ray tube 101.

  When the control terminal 107 transitions from the power-off state (S200), photographing permission (S203), and photographing state (S204) to the photographing-impossible state (S201), the control terminal 107 indicates that photographing is impossible. The second notification light (described later) by the unit 110 is turned off (FIG. 5). The user can recognize that shooting is currently impossible by turning off the notification light in the notification unit 110. Note that the user can also confirm that shooting is currently impossible at the control terminal 107. Further, as described above, the mode can be switched between the first, second, and third photographing modes by the mode operation unit 109 of the control terminal 107 in the state where photographing is not possible (S201).

  When the X-ray detector 103 receives an instruction to start imaging driving from the control terminal 107 in the imaging disabled state (S201), the X-ray detector 103 transits to the imaging permitted (S203) state through a refresh operation of the photoelectric conversion element. On the other hand, when the power supply to the X-ray detector 103 is stopped, the radiographing is disabled (S201) and the power is turned off (S200).

  In the imaging permission (S203) state, the X-ray detector 103 maintains a state in which imaging of images is started in response to detection of X-ray irradiation by the X-ray detection unit 104. During this time, the X-ray detector 103 performs idle reading and prohibits the refresh operation. Further, the control terminal 107 starts outputting the second notification light that can be photographed by the notification unit 110 when the state transition is made from the photographing disabled state (S201) or the photographing preparation state (S202) (FIG. 5). . In addition, since the time which can maintain the state of photography permission (S203) is limited, the alerting | reporting part 110 uses the 1st-4th alerting | reporting sound, and warning showing that time progress, remaining time, and remaining time are few. Etc. Note that the user can also confirm that the current photographing is possible at the control terminal 107 and the remaining time in the photographing permission state.

  The state of the X-ray detector 103 transitions to a state where imaging is not possible (S201) when an instruction to stop imaging driving is given from the control terminal 107 in the state where imaging is permitted (S203). In addition, when the X-ray detection unit 104 detects X-rays in the imaging permission (S203) state, the state of the X-ray detector 103 is changed to the imaging state (S204). In addition, when a predetermined time elapses without the X-ray detection unit 104 detecting X-rays in the imaging permission (S203) state, an X-ray detector is used to remove the accumulated charges when the charge (dark current) accumulates. The state of 103 periodically transitions to the state of shooting preparation (S202).

  In the imaging preparation state (S202), the X-ray detector 103 performs driving (refresh operation) to remove accumulated charges once, and returns the state to the imaging permission state (S203). When the state changes from photographing permission (S203) to photographing preparation (S202), the control terminal 107 turns off the notification unit 110 to indicate to the user that photographing is not possible (FIG. 5). Note that the user can also confirm that the current photographing is not possible on the control terminal 107.

  When the X-ray generator 100 emits X-rays and the X-ray detector 104 detects X-ray exposure, the state of the X-ray detector 103 changes from imaging permission (S203) to imaging (S204). The X-ray image acquisition operation is performed. The control terminal 107 turns off the notification unit 110 to indicate that shooting is disabled when the state transition from shooting permission (S203) to shooting (S204) occurs.

  At the control terminal 107, a display during shooting is displayed on a display (not shown), and when the shooting is finished, a shot image is displayed. Further, with the end of imaging, the state of the X-ray detector 103 changes from being in imaging (S204) to being incapable of imaging (S201).

Description of Operation in Third Imaging Mode As described above, in the third imaging mode, imaging is performed by forcibly synchronizing the X-ray generator 100 and the X-ray detector 103 manually. That is, the start of imaging by the X-ray detector 103 and the timing of X-ray exposure by the X-ray generator 100 are all performed manually. The state transition of the X-ray detector 103 in the third imaging mode will be described with reference to FIG.

  The state in which shooting is not possible (S201) is the same as in the first and second shooting modes. When the X-ray detector 103 receives an instruction to start imaging driving from the control terminal 107 in a state where imaging is not possible (S201), the X-ray detector 103 transitions to a state during imaging (S204) through a refresh operation. On the other hand, when the power supply to the X-ray detector 103 is stopped, the X-ray detector 103 shifts from the imaging disabled state (S201) to the power OFF state (S200).

  The control terminal 107 indicates that imaging is not possible when the driving state of the X-ray detector 103 is changed from the power-off (S200) or imaging (S204) state to the imaging impossible (S201) state. Then, the notification unit 110 is turned off. Thereby, the user can recognize that photographing is currently impossible. In addition, the user can also confirm that shooting is currently impossible at the control terminal 107. Further, in the shooting disabled state (S201), the mode operation unit 109 of the control terminal 107 can be switched between the first, second, and third shooting modes.

  When the X-ray generator 100 receives an input of the first switch of the exposure switch 102, the X-ray tube 101 starts an exposure preparation operation for the X-ray tube 101. When the X-ray generator 100 finishes the preparation for exposure of the X-ray tube 101, the X-ray generator 100 starts accepting the input of the second switch of the exposure switch 102, and receives the input of the second switch. Perform the exposure. The X-ray generation apparatus 100 cancels the preparation for exposure of the X-ray tube 101 when the input of the first switch disappears after the completion of the exposure preparation operation and before the input of the second switch is received.

  While the driving state of the X-ray detector 103 is during imaging (S204), the X-ray detector 103 is exposed to X-rays from the X-ray generation device 100 according to the user operation as described above. An X-ray image is acquired. That is, X-ray imaging is executed. In the control terminal 107, the captured image is displayed from the display during shooting.

  The control terminal 107 causes the notification unit 110 to output a third notification light indicating that shooting is possible when the state transition is made from shooting impossible (S201) to shooting (S204). Further, in the third imaging mode, the control terminal 107 causes the notification unit 110 to output a fifth notification sound during the time during which X-ray reception in the state of imaging (S204) is possible. When imaging is completed, that is, when the time during which X-ray reception is possible ends, the driving state of the X-ray detector 103 transitions from imaging (S204) to imaging disabled (S201), and the control terminal 107 is unable to perform imaging. In order to express the above, the output of the third notification light and the output of the fifth notification sound by the notification unit 110 are stopped. Note that the end of shooting in the third shooting mode is determined, for example, by elapse of a predetermined time by a timer.

  As described above, in the first embodiment, the first, second, and third notification methods of the notification unit 110 are assigned to the first, second, and third shooting modes, and the notification of the notification unit 110 is performed for each shooting mode. The method is different. Thereby, the user can determine the photographing mode selected and the timing of exposure permission without checking the control terminal 107 by looking at the notification unit 110. In particular, in the present embodiment, the notification unit 110 does not notify the imaging mode or the operation state of the sensor, but the user may operate the exposure switch 102 to cause the X-ray generation apparatus 100 to perform the exposure process. Is controlled to be notified. Therefore, it is possible to reduce operations that cause erroneous exposure.

In addition, when there is a time limit for the permission period during which exposure is permitted as in the second shooting mode, a notification is given so that the user can grasp the elapsed time of the shooting state or the remaining time of the state. . For example, if the photographing permission state (S203) in the second photographing mode can be maintained for 10 minutes, the first to fourth notification sounds can be used properly as follows.
・ First, a notification sound is sent every minute as the time lapse sound,
・ When 5 minutes have passed, a second notification sound is given,
・ When the remaining time becomes 1 minute, the third notification sound informs that the remaining time is short,
When the remaining time becomes 10 seconds, the fourth notification sound is continuously notified at regular intervals, and the notification sound is stopped when the time has come.

  Note that the notification in the first embodiment clearly indicates the period for which exposure is permitted, but it may also indicate a period during which exposure does not occur (outside the permitted period). Moreover, the alerting | reporting part 110 should just be able to alert | report that the permission period as mentioned above and its remaining time can be identified to a user. For example, as the first to third notification lights, notification lights of different colors may be used, or notification lights having different blinking patterns may be used. Further, the remaining time may be represented by a flashing pattern of notification light or the like. Further, the remaining time may be expressed by sequentially turning off one by one from all lighting of a plurality of lamps.

  Also in the third shooting mode, the remaining time of the permission period may be detected based on the timer value of the timer for detecting the end of shooting, and the notification mode may be switched according to the detected remaining time.

  As described above, according to the first embodiment, since the timing for permitting the operation for exposing the X-rays from the X-ray generation device 100 is specified, the operability for the user is improved, and the risk of erroneous operation is increased. And can reduce the risk of accidental exposure to the patient. Moreover, since the information on the exposure timing that has been confirmed by the control terminal 107 of the detector control device 105 until now can be determined by the separate notification unit 110, the work efficiency is improved. Furthermore, since the notification method of the notification unit 110 is different for each shooting mode, the user can determine the current shooting mode based on the notification from the notification unit 110 and also prevent erroneous operations.

[Second Embodiment]
In the first embodiment, a predetermined time is assigned as a time that can be taken in the second shooting mode, and the state is periodically changed from shooting permission (S203) to shooting preparation (S202). In the second imaging mode in the second embodiment, the transition from the imaging permission (S203) to the imaging preparation (S202) state is performed according to the dark current accumulation amount. Accordingly, the period of photographing permission (S203) is determined by the dark current accumulation amount. When the accumulation amount of dark current reaches the limit accumulation amount in the imaging permission (S203) state, the X-ray detector 103 changes the drive state to the imaging preparation (S202) state and accumulates charges (dark current). Release. Therefore, the notification unit 110 of the second embodiment notifies the amount of dark current accumulated during the photographing state so as to be known. For example, the notification unit 110 in the shooting permission state in the second shooting mode (S203),
-The first notification sound is used for every increase in accumulated dark current corresponding to 10% of the limit accumulation amount,
-When the dark current accumulation reaches 50% of the limit accumulation amount, a second notification sound is notified,
・ Notify that the amount of current that can be accumulated with the third alarm sound is small when dark current accumulation reaches 90% of the limit accumulation amount,
When the accumulation of dark current reaches 95% of the limit accumulation amount, the fourth notification sound continues to be notified at regular intervals, and the notification sound is stopped when the accumulated dark current reaches the limit accumulation amount (100%).

The amount of dark current accumulated is, for example,
-Prepare a pixel for dark current measurement in addition to the pixel for image acquisition, and read out the charge accumulated in that pixel, or
・ There is a data table of how charges are stored and how long they are stored.
It can be detected by such as.

  According to the second embodiment as described above, when the permission period is limited by the amount of accumulated dark current, it is based on a ratio to the limit value (limit accumulation amount) of the amount of accumulated dark current. Notification is performed. Therefore, in addition to the effects obtained in the first embodiment, an optimal imaging time for the X-ray detector 103 can be obtained even if a change occurs in the dark current accumulation time due to a change in the environment. This makes it possible to use the time available for shooting more effectively. Further, if the amount of accumulated dark current can be assumed, the user can assume how much X-ray image can be acquired before imaging, and the number of times of imaging re-execution can be reduced.

  The present invention is also realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, or the like) of the system or apparatus reads the program. It is a process to be executed.

Claims (12)

A plurality of driving states including a state of preparation for photographing for executing initialization processing of the photoelectric conversion element, a state of photographing permission for prohibiting the initialization processing and waiting for a photographing start instruction, and a state during photographing; An X-ray detector for detecting X-rays emitted from a radiation source;
Driving to change the driving state of the X-ray detector according to an imaging mode selected from a plurality of imaging modes in which the combination of the driving state of the X-ray detector and the period during which the user's exposure operation is permitted Control means;
An informing means for informing whether or not the driving state of the X-ray detector is in a permission period for permitting the exposure in the transition of the driving state according to the selected imaging mode. X-ray imaging device. The plurality of imaging modes include a first imaging mode that synchronizes operations for imaging of the X-ray source and the X-ray detector using predetermined communication,
When the selected imaging mode is the first imaging mode, the permission period is a period in which the driving state of the X-ray detector is the imaging preparation state and the imaging permission state. The X-ray imaging apparatus according to claim 1, wherein: The plurality of imaging modes include a second imaging mode for synchronizing operations for imaging of the X-ray source and the X-ray detector by detecting X-rays emitted from the X-ray source,
2. The permission period is a period in which the driving state of the X-ray detector is in the imaging permission state when the selected imaging mode is the second imaging mode. Or the X-ray imaging apparatus of 2. The plurality of imaging modes are for imaging the X-ray source and the X-ray detector by instructing irradiation of the X-ray source after the user shifts the X-ray detector to the imaging state. Including a third shooting mode that synchronizes the operation of
2. The permission period is a period in which the driving state of the X-ray detector is in the imaging state when the selected imaging mode is the third imaging mode. The X-ray imaging apparatus according to any one of Items 1 to 3.   5. The X according to claim 1, wherein the notification unit performs notification of whether or not it is the permission period and notification that enables recognition of the selected shooting mode. X-ray equipment.   The X-ray imaging apparatus according to claim 1, wherein the notification unit clearly indicates a period outside the permission period.   The X-ray imaging apparatus according to claim 1, wherein when the permission period is limited by time, the notification unit performs notification based on a remaining time of the permission period. .   The notification means performs notification based on a ratio to a limit value of the accumulated dark current amount when the permission period is limited by the accumulated dark current amount. The X-ray imaging apparatus according to any one of 1 to 6.   9. The apparatus according to claim 1, wherein the notification unit uses any one of light, sound, and vibration notification forms, or a combination of at least two of these notification forms. 9. X-ray imaging device. Communication means for communicating with the radiation detection device;
Display control means for displaying the state of the radiation detection apparatus on a display unit;
A first imaging mode that synchronizes the operation of the radiation source and the radiation detection device using predetermined communication, and the radiation detection device executes an imaging operation in response to detecting radiation emitted from the radiation source. A second photographing mode, and a selection means for selecting any one of the photographing modes,
The display control means causes the display unit to display at least a period during which radiation irradiation is possible when the first imaging mode is selected, and when the second imaging mode is selected. Is a radiography control apparatus that switches the state of the display unit between a period in which a radiographic image can be acquired and a period other than that in accordance with detection of the irradiated radiation. The selection means includes the first and second imaging modes, and a third imaging mode in which the radiation detection apparatus executes an imaging operation according to the elapse of a set time after an external instruction is given, Select one of the shooting modes,
11. The display control unit, when the third imaging mode is selected, switches the state of the display unit between a period during which the radiation detection apparatus is imaging and other periods. The radiography control apparatus described in 1. A plurality of driving states including a state of preparation for photographing for executing initialization processing of the photoelectric conversion element, a state of photographing permission for prohibiting the initialization processing and waiting for a photographing start instruction, and a state during photographing; A method for controlling an X-ray imaging apparatus including an X-ray detector for detecting X-rays emitted from a radiation source,
The drive control means drives the X-ray detector according to an imaging mode selected from a plurality of imaging modes in which the combination of the driving state of the X-ray detector and the period during which the user's exposure operation is permitted. A drive control process for transitioning states;
A notification step of notifying whether or not the driving state of the X-ray detector is in a period during which the exposure is permitted in the transition of the driving state according to the selected imaging mode. A control method for an X-ray imaging apparatus.

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