WO2022172646A1 - 口腔内撮像システム及び撮像装置 - Google Patents
口腔内撮像システム及び撮像装置 Download PDFInfo
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- 238000003384 imaging method Methods 0.000 title claims abstract description 404
- 238000001514 detection method Methods 0.000 claims abstract description 83
- 230000005855 radiation Effects 0.000 claims abstract description 78
- 210000000214 mouth Anatomy 0.000 claims description 27
- 238000012544 monitoring process Methods 0.000 abstract description 28
- 238000000034 method Methods 0.000 description 38
- 238000004891 communication Methods 0.000 description 28
- 238000012545 processing Methods 0.000 description 20
- 230000020169 heat generation Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 210000000988 bone and bone Anatomy 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/50—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment specially adapted for specific body parts; specially adapted for specific clinical applications
- A61B6/51—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment specially adapted for specific body parts; specially adapted for specific clinical applications for dentistry
- A61B6/512—Intraoral means
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/54—Control of apparatus or devices for radiation diagnosis
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/42—Arrangements for detecting radiation specially adapted for radiation diagnosis
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/42—Arrangements for detecting radiation specially adapted for radiation diagnosis
- A61B6/4208—Arrangements for detecting radiation specially adapted for radiation diagnosis characterised by using a particular type of detector
- A61B6/425—Arrangements for detecting radiation specially adapted for radiation diagnosis characterised by using a particular type of detector using detectors specially adapted to be used in the interior of the body
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/54—Control of apparatus or devices for radiation diagnosis
- A61B6/542—Control of apparatus or devices for radiation diagnosis involving control of exposure
Definitions
- the present disclosure relates to an intraoral imaging system and an imaging device.
- An imaging device that detects radiation transmitted through an object while being placed in the oral cavity.
- the dose of radiation is monitored, and when the dose of radiation drops to a predetermined threshold, detection of radiation for acquiring an image of the object (that is, imaging of the object) is terminated.
- detection of radiation for acquiring an image of the object that is, imaging of the object
- the type of object anterior teeth, posterior teeth, etc.
- the type of imaging method parallel, bisecting, bitewing, occlusal, etc. Since the total dose of sufficient radiation varies, if the imaging of the object is terminated based only on the dose of radiation, the image of the object may not be obtained properly.
- a control module is provided separately from the sensor used in the state of being placed in the oral cavity, and the sensor transmits a signal related to the radiation dose to the control module, and controls The module analyzes the signal to determine the end timing of the imaging of the object.
- the present disclosure provides an intraoral imaging system and an imaging device that can appropriately acquire an image of an object, improve handling of the imaging device, and suppress heat generation of the imaging device in the oral cavity. With the goal.
- An intraoral imaging system includes an imaging device that detects radiation transmitted through an object while being placed in the oral cavity, and a control device that is electrically connected to the imaging device,
- the imaging device includes an imaging unit that detects radiation, a control unit that is configured to be able to communicate with the control device and that controls the imaging unit, and a case that houses the imaging unit and the control unit.
- the unit performs a first detection that detects radiation to obtain an image of the object and a second detection that detects radiation to monitor the dose of radiation, the control unit performing transmitting the first signal obtained by the second detection and the second signal obtained by the second detection to the control device, the control device receiving the first signal and the second signal and controlling the control command generated based on the second signal unit, the control unit receives the control command, and controls the imaging unit according to the control command.
- the control device receives the second signal related to the dose of radiation, transmits the control command generated based on the second signal to the control unit, the control unit receives the control command, and controls It controls the imaging unit according to the command.
- the control unit receives the control command, and controls It controls the imaging unit according to the command.
- the imaging section and the control section are accommodated in the case. This makes it possible to avoid the problem that occurs when the control section is provided separately from the imaging section, that is, the problem that the control section becomes an obstacle when the imaging section is arranged in the oral cavity.
- the control device generates a control command based on the second signal related to the dose of radiation.
- the control unit of the imaging device As a result, it is possible to reduce the processing load on the control unit of the imaging device, and as a result, it is possible to reduce the size of the imaging device and suppress the heat generation of the imaging device.
- the intraoral imaging system it is possible to obtain an appropriate image of an object, improve handling of the imaging device, and suppress heat generation of the imaging device in the oral cavity.
- the controller may generate an image of the object based on the first signal. According to this, it is possible to reliably generate an image of the object.
- the control command includes an end command to end the first detection, and the control unit causes the imaging unit to end the first detection when the end command is received.
- the control unit causes the imaging unit to end the first detection when the end command is received.
- control device may generate an end command when the total dose of radiation calculated based on the second signal exceeds a predetermined threshold.
- the detection of radiation for acquiring an image of the object can be completed with an appropriate total dose according to the type of object and/or the type of imaging method, and as a result, the object An image of an object can be properly acquired.
- the control device stores a threshold for each imaging condition of the object, receives an input of the imaging condition, and may set a threshold corresponding to the imaging condition. . According to this, since an appropriate threshold value is set according to the input imaging condition, for example, it is possible to appropriately acquire the image of the object regardless of the type of object and/or the type of imaging method. can.
- control device may receive imaging conditions including object information about the object, and set a threshold value corresponding to the object information. According to this, since an appropriate threshold is set according to the object to be imaged, the image of the object can be appropriately acquired regardless of the type of the object.
- the control device may receive imaging conditions including imaging method information regarding the imaging method of the object, and set a threshold value corresponding to the imaging method information. According to this, since an appropriate threshold is set according to the imaging method of the object, the image of the object can be appropriately acquired regardless of the type of imaging method.
- control unit may be configured to communicate with the control device by wire. According to this, a stable communication environment can be ensured between the control unit and the control device. Further, since the imaging unit and the control unit are accommodated in a single case, even in a configuration in which the control unit and the control device are physically connected by a wire, when the imaging unit is arranged in the oral cavity, The problem of the control getting in the way can be avoided.
- An imaging device is an imaging device that detects radiation transmitted through an object while being placed in an oral cavity, and is configured to be able to communicate with an imaging unit that detects radiation and a control device.
- a control unit for controlling the imaging unit; and a case housing the imaging unit and the control unit.
- a second detection is performed to detect radiation to monitor the dose of radiation, and the control unit transmits the first signal obtained by the first detection and the second signal obtained by the second detection to the control device. Then, it receives a control command from the control device and controls the imaging unit according to the control command.
- the control unit transmits the second signal acquired by the second detection to the control device, receives the control command from the control device, and controls the imaging unit according to the control command.
- the control device can determine the end timing of imaging of the object according to the type of object and/or the type of imaging method based on the second signal. can be obtained properly.
- the image pickup section and the control section are housed in the case. This makes it possible to avoid the problem that occurs when the control section is provided separately from the imaging section, that is, the problem that the control section becomes an obstacle when the imaging section is arranged in the oral cavity.
- the control command is generated in the control device.
- an intraoral imaging system and an imaging device are provided that can appropriately acquire an image of an object, improve handling of the imaging device, and suppress heat generation of the imaging device in the oral cavity. It becomes possible to
- FIG. 1 is a configuration diagram of an intraoral imaging system according to one embodiment.
- FIG. 2 is a cross-sectional view of the imaging device shown in FIG.
- FIG. 3 is a block diagram of the imaging device and control device shown in FIG.
- FIG. 4 is a sequence diagram showing the flow of processing from reception of imaging conditions to start of detection for imaging in imaging processing.
- FIG. 5 is a sequence diagram showing the flow of processing from the generation of the second first start command to the acquisition of the image of the object in the imaging processing.
- FIG. 6 is a flowchart showing the flow of threshold setting processing.
- the intraoral imaging system 100 includes an imaging device 1 and a control device 10 .
- the imaging device 1 detects radiation (for example, X-rays) transmitted through an object such as a tooth while being placed in the oral cavity.
- the imaging device 1 is electrically connected to the control device 10 via a cable 9 included in the imaging device 1 .
- the imaging device 1 and the control device 10 transmit and receive signals (that is, communicate) via the cable 9 .
- the control device 10 is configured by a computer device such as a PC or a tablet terminal, for example.
- an electric signal generated thereby is transmitted from the imaging device 1 to the control device 10, and the object is detected based on the electric signal.
- image (radiographic image) is generated by the controller 10 .
- the imaging device 1 includes a wiring board 2, an image sensor 3, a FOP (Fiber Optical Plate) 4, a scintillator 5, a control circuit 6, a communication module 7, a case 8, a cable 9;
- the image sensor 3 is mounted on one main surface of the wiring board 2 .
- the image sensor 3 is, for example, a solid-state imaging device such as a CMOS image sensor.
- FOP 4 is arranged on image sensor 3 .
- the scintillator 5 is arranged on the FOP4.
- the imaging device 1 receives power supply from a control device 10 (see FIG. 1) via a cable 9, for example.
- the control circuit 6 and the communication module 7 are mounted on the other main surface of the wiring board 2 .
- the control circuit 6 is composed of integrated circuits such as FPGA (field-programmable gate), ASIC (Application Specific Integrated Circuit), CPLD (Complex Programmable Logic Device), CPU (Central Processing Unit), and the like.
- the control circuit 6 performs various controls in the imaging device 1 .
- the communication module 7 communicates with the control device 10 according to instructions from the control circuit 6 .
- the communication module 7 receives various data transmitted from the control device 10 .
- the communication module 7 is, for example, an integrated circuit such as a USB (Universal Serial Bus) controller.
- the communication module 7 is a USB controller and communicates with the control device 10 according to the USB standard.
- the case 8 accommodates the wiring board 2, the image sensor 3, the FOP 4, the scintillator 5, the control circuit 6 and the communication module 7.
- a wall portion 8a along the scintillator 5 among the wall portions of the case 8 is a wall portion on which radiation is expected to enter.
- the wiring board 2 is electrically connected to an end of a cable 9 passing through a wall of the case 8 opposite to the wall 8a.
- cable 9 is a USB cable.
- the imaging device 1 has an imaging section 20 and a control section 30 .
- the imaging unit 20 is composed of the image sensor 3, the FOP 4, and the scintillator 5 described above.
- the control unit 30 is composed of the control circuit 6 and the communication module 7 described above.
- the control unit 30 performs communication with the imaging unit 20 , communication with the control device 10 , and control of the imaging unit 20 .
- the imaging unit 20 is electrically connected to the control unit 30 by wiring (not shown) inside the case 8 .
- the imaging unit 20 and the control unit 30 transmit and receive signals (that is, communicate) via the wiring.
- the control unit 30 is configured to be able to communicate with the control device 10 by wire. Specifically, the control unit 30 is configured to be able to communicate with the control device 10 via the cable 9 (see FIG. 1).
- the scintillator 5 emits fluorescence corresponding to the intensity of the incident radiation.
- the fluorescence is guided by the FOP 4 and enters the image sensor 3 , an electrical signal corresponding to the intensity of the incident fluorescence is generated in the image sensor 3 , and the electrical signal is sent to the controller 30 via wiring inside the case 8 . It is sent to the control circuit 6 .
- the image sensor 3 of the imaging unit 20 has a plurality of imaging pixels 3A and a plurality of monitor pixels 3B.
- the plurality of imaging pixels 3A are arranged two-dimensionally and constitute a photodetection region.
- the plurality of monitor pixels 3B are arranged, for example, along the periphery of the plurality of imaging pixels 3A. Note that the number of monitor pixels 3B may be at least one.
- the imaging unit 20 uses the plurality of imaging pixels 3A to perform imaging detection (first detection) for detecting radiation in order to obtain an image of an object, and outputs an imaging signal (first signal). do.
- first detection for detecting radiation
- first signal an imaging signal
- each imaging pixel 3A converts the fluorescence emitted by the scintillator 5 due to the incidence of radiation into an electric charge, and the electric charge is output as an imaging signal.
- the control unit 30 switches the switch SW1 ON/OFF to control the image sensor 3 so that the charge generated in each imaging pixel 3A is output as an imaging signal.
- the switch SW1 is a switch that the image sensor 3 has and is connected to the imaging pixels 3A and the control circuit 6 .
- the switch SW1 is composed of, for example, a transistor.
- the imaging unit 20 uses the plurality of monitor pixels 3B to perform monitor detection (second detection) for detecting radiation in order to monitor the dose of radiation, and outputs a monitor signal (second signal). .
- monitor detection second detection
- second signal second signal
- each monitoring pixel 3B converts the fluorescence emitted by the scintillator 5 due to the incidence of radiation into electric charges, and the electric charges is output as a monitor signal.
- the control unit 30 switches the switch SW2 ON/OFF to control the image sensor 3 so that the charge generated in each monitor pixel 3B is output as a monitor signal.
- the switch SW2 is a switch that the image sensor 3 has and is connected to the monitor pixels 3B and the control circuit 6 .
- the switch SW2 is composed of, for example, a transistor.
- the control unit 30 acquires the imaging signal and the monitoring signal from the imaging unit 20 and transmits the imaging signal and the monitoring signal to the control device 10 .
- the control unit 30 receives control commands from the control device 10 and controls the imaging unit 20 according to the control commands.
- the control commands include a first start command, a second start command and an end command.
- the first start command is a command for starting monitor detection for acquiring a monitor signal.
- the control unit 30 performs monitoring detection. Specifically, as described above, the control unit 30 controls the imaging unit 20 so that each monitor pixel 3B starts accumulating electric charges.
- the control unit 30 terminates the monitoring detection when, for example, a predetermined period of time has elapsed.
- the control unit 30 controls the imaging unit 20 so that the charge accumulation by each monitor pixel 3B ends. After completing the monitoring detection and acquiring the monitoring signal from the imaging unit 20 , the control unit 30 transmits the monitoring signal to the control device 10 . More specifically, the control unit 30 converts the monitor signal acquired from the imaging unit 20 into a signal conforming to the USB standard communication protocol, and transmits the converted monitor signal to the control device 10 . That is, when the control unit 30 receives the first start command from the control device 10, the control unit 30 starts monitoring the dose of radiation in the imaging unit 20, ends the monitoring when a predetermined period of time has elapsed, and is transmitted to the control device 10.
- the second start command is a command for starting imaging detection for acquiring an imaging signal.
- the end command is a command for ending imaging detection.
- the control unit 30 receives the second start command from the control device 10, the control unit 30 performs detection for imaging. Specifically, as described above, the control unit 30 controls the imaging unit 20 so that each imaging pixel 3A starts accumulating electric charges.
- the control unit 30 ends the imaging detection. Specifically, as described above, the control unit 30 controls the imaging unit 20 so that the charge accumulation by each imaging pixel 3A ends.
- the control unit 30 terminates the detection for imaging and acquires the signal for imaging from the imaging unit 20 , the control unit 30 transmits the signal for imaging to the control device 10 .
- control unit 30 converts the imaging signal acquired from the imaging unit 20 into a signal conforming to the USB standard communication protocol, and transmits the converted imaging signal to the control device 10 . That is, when the control unit 30 receives the second start command from the control device 10, the control unit 30 causes the imaging unit 20 to start detection for obtaining a radiation image. The resulting imaging signal is transmitted to the control device 10 . [Configuration of control device]
- the control device 10 has a storage unit 11 , a communication unit 12 , a processing unit 13 , an input reception unit 14 and a display unit 15 .
- the storage unit 11 is, for example, a hard disk or the like, and stores various data.
- the communication unit 12 is, for example, a communication device.
- the processing unit 13 is, for example, a processor.
- the processing unit 13 executes software (program) read into a memory (not shown) or the like of the control device 10, and controls reading and writing of data in the memory or the like and communication by the communication unit 12.
- the input reception unit 14 is an interface unit that receives input of various data from the user.
- the input reception unit 14 is, for example, a keyboard, a mouse, or the like.
- the display unit 15 displays various information according to instructions from the processing unit 13 .
- the display unit 15 is, for example, a display device included in the control device 10 .
- the display unit 15 may constitute, for example, a GUI (Graphical User Interface) and function as an interface unit that receives input of various data from the user.
- GUI Graphic User Interface
- the control device 10 functions as a higher-level controller of the control unit 30.
- the control device 10 receives an input of imaging conditions for an object from the user.
- the imaging conditions are input by, for example, the user inputting the object information and the imaging method information to the input reception unit 14 .
- the object information is the type of object.
- the object is a site to be imaged in the oral cavity, for example, a back tooth and an anterior tooth.
- the imaging method information is the type of imaging method. Imaging methods are, for example, the parallel method, the bisecting method, the bitewing method, and the occlusal method.
- the control device 10 Upon receiving input of imaging conditions, the control device 10 generates a first start command and transmits the first start command to the control unit 30 of the imaging device 1 . As a result, the control unit 30 starts monitoring detection for monitoring the dose of radiation. That is, when the imaging conditions are input to the control device 10 by the user, the control device 10 causes the imaging device 1 to start monitoring detection as a pre-stage process for starting acquisition of an image of the object.
- the control device 10 Upon receiving the monitor signal from the control unit 30 , the control device 10 generates a control command based on the monitor signal and transmits the generated control command to the control unit 30 . Specifically, the control device 10 performs a known analysis (for example, the analysis described in Japanese Patent No. 5715960) such as estimating the dose of radiation based on the monitor signal, and the analyzed analysis result is imaged. If the start condition for use detection is not satisfied, the first start command is generated again, and the first start command is transmitted to the control unit 30 . On the other hand, the control device 10 generates a second start command and transmits the second start command to the control unit 30 when the analysis result satisfies the conditions for starting detection for imaging.
- a known analysis for example, the analysis described in Japanese Patent No. 5715960
- the control unit 30 After transmitting the second start command to the control unit 30 , the control unit 30 generates the first start command again and transmits the first start command to the control unit 30 .
- monitoring detection for monitoring the dose of radiation and imaging detection for acquiring an image of the object are started. That is, the control device 10 causes the imaging device 1 to start detecting radiation for obtaining an image of the object and to continue monitoring the dose of radiation for obtaining an appropriate image of the object.
- the control device 10 receives the monitor signal from the control unit 30 again, it generates a control command based on the monitor signal and transmits the generated control command to the control unit 30 .
- the control device 10 performs analysis based on the dose of radiation indicated by the monitor signal.
- the control device 10 calculates the total dose of radiation calculated based on the monitor signal.
- the control device 10 estimates the total dose of radiation received by the plurality of imaging pixels 3A based on the monitor signal.
- the correlation between the dose of radiation indicated by the monitor signal that is, detected by the plurality of monitor pixels 3B) and the dose of radiation actually entering the oral cavity is calculated in advance.
- the control device 10 calculates the total dose of radiation received by the plurality of imaging pixels 3A by performing known calculations (for example, calculations described in Japanese Patent No. 5715960) based on the correlation.
- the control device 10 determines whether or not the analyzed analysis result satisfies the imaging detection end condition. Specifically, the control device 10 sets a predetermined threshold value, and determines that the imaging detection end condition is satisfied when the calculated total dose exceeds the threshold value.
- the storage unit 11 of the control device 10 stores a threshold value for each imaging condition of the object.
- the control device 10 refers to the stored threshold value for each imaging condition of the target object, and sets the threshold value corresponding to the imaging condition received by the input receiving unit 14 .
- the control device 10 stores a threshold value for each combination of the type of object and the type of imaging method, and stores the threshold value corresponding to the object information and the imaging method information received by the input receiving unit 14. set. A detailed method for setting the threshold will be described later.
- the control device 10 If the analyzed analysis result does not satisfy the imaging detection end condition, the control device 10 generates the first start command again and transmits the first start command to the control unit 30 . On the other hand, the control device 10 generates an end command and transmits the end command to the control unit 30 when the analysis result satisfies the end condition of the detection for imaging. Accordingly, in the imaging device 1 , imaging detection for acquiring an image of the object is completed, and an imaging signal is transmitted to the control device 10 . That is, the control device 10 determines an appropriate end timing of the detection for imaging by performing the above analysis, and terminates the detection for imaging performed in the imaging device 1 . When receiving the imaging signal from the control unit 30, the control device 10 generates an image of the object based on the received imaging signal. As a result, imaging of the object is performed. [Imaging processing]
- FIG. 4 is a sequence diagram showing the flow of processing from reception of imaging conditions to start of detection for imaging in imaging processing.
- FIG. 5 is a sequence diagram showing the flow of processing from the generation of the second first start command to the acquisition of the image of the object in the imaging processing. Note that the radiation source in the imaging process continuously emits X-rays of constant intensity.
- the control device 10 receives an input of imaging conditions for an object from the user (step S01).
- the input of the imaging conditions is performed by the user inputting the object information and the imaging method information to the input reception unit 14 .
- the control device 10 sets a threshold used for determining the end timing of detection for imaging based on the input imaging conditions (step S02).
- the control device 10 refers to the threshold value for each imaging condition stored in the storage unit 11 and sets the threshold value corresponding to the input imaging condition. The details of how to receive the input of the imaging conditions and how to set the threshold will be described later.
- the control device 10 generates a first start command for starting imaging detection by the plurality of monitor pixels 3B, and transmits the first start command to the control unit 30 of the imaging device 1 (step S03).
- the control unit 30 receives the first start command (step S04), and controls the imaging unit 20 to start monitoring detection according to the first start command (step S05). Specifically, the control unit 30 causes the monitoring pixels 3B of the imaging unit 20 to start accumulating charges. Subsequently, each monitor pixel 3B starts accumulating charges (step S06). As a result, monitoring of the dose of radiation is started on the imaging device 1 side.
- each monitor pixel 3B outputs a monitor signal corresponding to the accumulated charges to the control unit 30 when a predetermined period has elapsed (step S07).
- the control unit 30 receives monitor signals from the plurality of monitor pixels 3B (step S08), and transmits the monitor signals to the control device 10 (step S09).
- the control device 10 receives the monitor signal from the control unit 30 (step S10), and performs known analysis such as estimating the dose of radiation based on the monitor signal (for example, the analysis described in Japanese Patent No. 5715960). (step S11).
- the control device 10 determines whether or not the analysis result satisfies the conditions for starting detection for imaging (step S12).
- step S12 determines that the analysis result does not satisfy the conditions for starting detection for imaging (step S12: NO)
- the process returns to step S03.
- step S12 determines that the analysis result satisfies the conditions for starting detection for imaging (step S12: YES)
- it generates a second start command for starting detection for imaging, and generates a second start command for starting detection for imaging. to the control unit 30 (step S13).
- control unit 30 receives the second start command (step S14), and controls the imaging unit 20 to start detection for imaging according to the second start command (step S15). Specifically, the control unit 30 causes each imaging pixel 3A of the imaging unit 20 to start accumulating electric charges. Subsequently, each imaging pixel 3A starts accumulating charges (step S16). As a result, detection for obtaining an image of the object is started on the imaging device 1 side.
- the control device 10 regenerates the first start command and transmits the first start command to the control unit 30 of the imaging device 1 (step S17).
- the control unit 30 receives the first start command (step S18), and controls the imaging unit 20 to start monitoring detection according to the first start command (step S19).
- each monitor pixel 3B of the imaging unit 20 starts accumulating charges (step S20).
- the radiation dose is continuously monitored for obtaining an appropriate image of the object while detecting the radiation for obtaining the image of the object.
- the imaging unit 20 acquires the monitor signal and outputs the monitor signal to the control unit 30 when a predetermined period of time has elapsed (step S21).
- the control unit 30 receives the monitor signal from the imaging unit 20 (step S22), and transmits the monitor signal to the control device 10 (step S23).
- the control device 10 receives the monitor signal from the control unit 30 (step S24), and performs analysis based on the monitor signal (step S25). Specifically, as the above analysis, the control device 10 calculates the total dose of radiation calculated based on the monitor signal. Subsequently, the control device 10 determines whether or not the analysis result satisfies the imaging detection end condition (step S26).
- control device 10 determines whether or not the total dose of radiation calculated by the analysis exceeds the threshold set in step S02. If the control device 10 determines that the analysis result does not satisfy the imaging detection end condition (that is, the total dose of radiation does not exceed the threshold set in step S02) (step S26: NO), step S17. Return processing to . On the other hand, when the control device 10 determines that the analysis result satisfies the imaging detection termination condition (that is, the total dose of radiation exceeds the threshold set in step S02) (step S26: YES) , generates an end command for ending imaging detection by the plurality of imaging pixels 3A, and transmits the end command to the control unit 30 (step S27).
- control unit 30 receives the end command (step S28), and controls the imaging unit 20 to end the imaging detection according to the end command (step S29). Subsequently, each imaging pixel 3A finishes accumulating electric charges (step S30), and outputs an imaging signal corresponding to the accumulated electric charges to the control unit 30 (step S31). Subsequently, the control unit 30 receives imaging signals from the plurality of imaging pixels 3A (step S32), and transmits the imaging signals to the control device 10 (step S33). Subsequently, the control device 10 receives the imaging signal (step S34), and generates an image of the object based on the imaging signal (step S35). This completes the imaging of the object. [Threshold setting process]
- FIG. 6 is a flowchart showing a series of flow of threshold setting processing. As a premise, the input of imaging conditions from the user to the control device 10 has been completed (see step S01 in FIG. 4).
- a screen for selecting the imaging method and the type of object is displayed on the display unit 15 (see FIG. 3) of the control device 10, and the user operates the input reception unit 14 such as a mouse to select the imaging method and the object.
- the input of imaging conditions that is, object information and imaging method information
- the control device 10 stores a threshold for each combination of the type of object and the type of imaging method in the storage unit 11 .
- the threshold value is set to be higher.
- the threshold is set to be higher when the target is the back tooth than when the target is the front tooth.
- the control device 10 sets the threshold in the threshold setting process by referring to the input imaging conditions and the threshold for each combination. Note that the threshold value, the type of object, and the type of imaging method are not limited to this example.
- the control device 10 determines whether or not the imaging method information included in the imaging conditions indicates the parallel method or the bisection method (step S101). If the control device 10 determines that the imaging method information indicates the parallel method or the bisecting method (step S101: YES), it determines whether or not the object information indicates front teeth (step S102). If the control device 10 determines that the object information indicates the front tooth (step S102: YES), it sets the threshold value to "1" (step S103). On the other hand, when the control device 10 determines that the object information does not indicate the front tooth (in other words, the object information indicates the back tooth) (step S102: NO), it sets the threshold to "1.3" ( step S104).
- step S101 determines whether the imaging method information indicates the bitewing method (step S105).
- step S105 determines whether the imaging method information indicates the bitewing method (step S105: YES)
- step S106 determines whether the object information indicates the front teeth (step S106). If the control device 10 determines that the object information indicates the front tooth (step S106: YES), it sets the threshold to "1.3" (step S107). On the other hand, if the control device 10 determines that the object information does not indicate the front tooth (that is, the object information indicates the back tooth) (step S106: NO), it sets the threshold value to "1.5" (step S108 ).
- step S105 determines in step S105 that the imaging method information does not indicate the bitewing method (that is, the imaging method information indicates the occlusion method) (step S105: NO), it sets the threshold to "1.7". Set (step S109). Through the threshold setting process described above, the imaging apparatus sets a threshold corresponding to the imaging conditions. [Action and effect]
- the control device 10 receives a monitor signal related to radiation dose, transmits a control command generated based on the monitor signal to the control unit 30, and the control unit 30 , receives the control command, and controls the imaging unit 20 according to the control command.
- the imaging unit 20 and the control unit 30 are accommodated in the case 8 .
- the control device 10 generates a control command based on the monitor signal.
- the processing load on the control unit 30 on the imaging device 1 side can be reduced, and as a result, the size of the imaging device 1 can be reduced, and heat generation of the imaging device 1 can be suppressed.
- the intraoral imaging system 100 and the imaging device 1 it is possible to appropriately obtain an image of a target object, improve the handleability of the imaging device 1, and suppress heat generation of the imaging device 1 in the oral cavity. can be done.
- the imaging device 1 has a control unit 30, and the control unit 30 converts the imaging signal and the monitor signal into signals conforming to the communication protocol of the general-purpose communication standard (USB standard). and transmits it to the control device 10 , and controls the imaging unit 20 according to the control command received from the control device 10 .
- the imaging device 1 includes the control unit 30 separately from the control device 10 that substantially controls the imaging unit 20 by generating a control command for controlling the imaging unit 20.
- Communication between the device 1 and the control device 10 can be communication conforming to a general-purpose communication standard. As a result, communication between the imaging device 1 and the control device 10 can be realized with a simple configuration.
- each control command received from the control device 10 can be reliably processed at appropriate timing, and cost can be reduced. can be planned. It should be noted that, instead of providing the control unit 30 in the imaging apparatus 1, for example, providing the image sensor 3 with a function equivalent to that of the control unit 30 is not realistic in terms of cost and the like.
- control unit 30 is arranged outside the oral cavity, the imaging unit 20 and the control unit 30 are electrically connected by a first cable (not shown), and the control unit 30 and the control device 10 are connected to the second cable.
- a cable (not shown) of the control unit 30 When electrically connected by a cable (not shown) of the control unit 30, the connection portion between the control unit 30 and the first cable, and the connection portion between the control unit 30 and the second cable, There is concern about the risk of breakage and failure.
- the intraoral imaging system 100 since the controller 30 is housed in the case 8, such a risk can be avoided.
- the number of cables can be reduced as compared with the above-described example, so the number of parts can be reduced.
- control device 10 performs various processes such as generation of control commands and analysis of monitoring signals. Process changes can be easily implemented.
- control device 10 In the intraoral imaging system 100, the control device 10 generates an image of the object based on the imaging signal. This makes it possible to reliably generate an image of the object.
- the control command includes an end command for ending detection for imaging, and when the control unit 30 receives the end command, it controls the imaging unit 20 to end detection for imaging.
- the detection of radiation for obtaining an image of the object can be terminated at an appropriate timing according to the type of object and/or the type of imaging method, and as a result, an image of the object can be obtained. can be obtained properly.
- the control device 10 calculates the total dose of radiation in the plurality of imaging pixels 3A of the image sensor 3 based on the monitor signal, and the calculated total dose of radiation exceeds a predetermined threshold. Generates an exit command if This makes it possible, for example, to terminate the detection of radiation for acquiring an image of the object with an appropriate total dose according to the type of object and/or the type of imaging method, resulting in The image can be properly acquired. Further, according to the intraoral imaging system 100, the timing of ending the radiation detection process for acquiring the image of the object is automatically adjusted in the imaging device 1 based on the monitor signal. Source side radiation dose and emission time adjustments may not be required.
- the control device 10 stores a threshold for each imaging condition of an object, receives an input of the imaging condition, and sets a threshold corresponding to the imaging condition.
- a threshold corresponding to the imaging condition As a result, an appropriate threshold is set according to the input imaging conditions, so that an image of the object can be appropriately acquired regardless of the type of the object and/or the type of imaging method, for example.
- the control device 10 receives imaging conditions including object information about the object, and sets a threshold value corresponding to the object information. As a result, since an appropriate threshold is set according to the object to be imaged, the image of the object can be appropriately acquired regardless of the type of the object.
- the control device 10 receives imaging conditions including imaging method information regarding an imaging method of an object, and sets a threshold value corresponding to the imaging method information. As a result, an appropriate threshold is set according to the imaging method of the object, so that the image of the object can be appropriately acquired regardless of the type of imaging method.
- the controller 30 is configured to communicate with the controller 10 by wire. Thereby, a stable communication environment can be secured between the control unit 30 and the control device 10 . Further, since the imaging unit 20 and the control unit 30 are accommodated in the single case 8, even in a configuration in which the control unit 30 and the control device 10 are physically connected by a wire, the imaging unit 20 can be installed in the oral cavity. It is possible to avoid the problem that the control unit 30 becomes an obstacle when the is arranged. [Modification]
- the image capturing unit 20 may perform image capturing detection and monitor detection.
- the imaging unit 20 may be composed only of the image sensor 3 and the scintillator 5, or the imaging unit 20 may be composed only of a direct conversion type imaging element that generates electric charges when radiation is incident.
- the control unit 30 may be configured to be able to communicate with the control device 10, receive control commands, and control the imaging unit 20 according to the control commands.
- the control unit 30 may include components other than the control circuit 6 and the communication module 7 in addition to the control circuit 6 and the communication module 7 or instead of the control circuit 6 and the communication module 7 .
- the image sensor 3 includes a plurality of imaging pixels 3A and a plurality of monitor pixels 3B. It may be configured to output a signal and a monitor signal. Also, the switch SW1 and the switch SW2 may be provided outside the image sensor 3 .
- the intraoral imaging system 100 may include multiple imaging devices 1 .
- a plurality of such imaging devices 1 can be placed, for example, in the oral cavity of an animal.
- An example in which the intraoral imaging system 100 includes two imaging devices 1 will be described below.
- the control device 10 transmits an end command to the control unit 30 of each imaging device 1 when the monitor signal of one of the two imaging devices 1 exceeds the threshold. That is, the control device 10 causes both imaging devices 1 to stop detecting radiation for acquiring images of the object.
- the target can be captured with an appropriate total dose. Detection of radiation for acquiring an image of an object can be terminated, so that an image of the object can be properly acquired.
- control unit 30 and the control device 10 may be configured to communicate wirelessly (for example, LAN, Bluetooth (registered trademark), Wifi, etc.).
- the imaging process by the intraoral imaging system 100 is not limited to the above embodiment.
- the control device 10 may set the threshold based on one of the object information and the imaging method information, or may set the threshold according to an imaging condition different from the object information and the imaging method information. .
- the control device 10 may generate only the end command. In that case, the control unit 30 may start monitoring detection when, for example, a predetermined period of time has elapsed. Also, in the intraoral imaging system 100, the control device 10 may generate other control commands.
- each step shown in the sequence diagrams (FIGS. 4 and 5) of the imaging method described above and each step shown in the flowchart (FIG. 6) of the threshold setting method described above may be omitted as appropriate. Also, the order of each step may be changed as appropriate.
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Abstract
Description
[口腔内撮像システムの構成]
[撮像装置の構成]
[制御装置の構成]
[撮像処理]
[閾値設定処理]
[作用及び効果]
[変形例]
Claims (9)
- 口腔内に配置された状態で、対象物を透過した放射線を検出する撮像装置と、
前記撮像装置と電気的に接続された制御装置と、を備え、
前記撮像装置は、
前記放射線を検出する撮像部と、
前記制御装置と通信可能に構成されており、前記撮像部を制御する制御部と、
前記撮像部及び前記制御部を収容しているケースと、を有し、
前記撮像部は、前記対象物の像を取得するために前記放射線を検出する第1検出、及び前記放射線の線量をモニタするために前記放射線を検出する第2検出を実施し、
前記制御部は、前記第1検出によって取得された第1信号、及び前記第2検出によって取得された第2信号を前記制御装置に送信し、
前記制御装置は、前記第1信号及び前記第2信号を受信し、前記第2信号に基づいて生成した制御コマンドを前記制御部に送信し、
前記制御部は、前記制御コマンドを受信し、前記制御コマンドに従って前記撮像部を制御する、口腔内撮像システム。 - 前記制御装置は、前記第1信号に基づいて前記対象物の前記像を生成する、請求項1に記載の口腔内撮像システム。
- 前記制御コマンドは、前記第1検出を終了させる終了コマンドを含み、
前記制御部は、前記終了コマンドを受信した場合に、前記第1検出を終了させるように前記撮像部を制御する、請求項1又は2に記載の口腔内撮像システム。 - 前記制御装置は、前記第2信号に基づいて算出した前記放射線の総線量が所定の閾値を超えた場合に、前記終了コマンドを生成する、請求項3に記載の口腔内撮像システム。
- 前記制御装置は、
前記対象物の撮像条件ごとに前記閾値を記憶しており、
前記撮像条件の入力を受け付け、前記撮像条件に対応する前記閾値を設定する、請求項4に記載の口腔内撮像システム。 - 前記制御装置は、前記対象物に関する対象物情報を含む前記撮像条件を受け付け、前記対象物情報に対応する前記閾値を設定する、請求項5に記載の口腔内撮像システム。
- 前記制御装置は、前記対象物の撮像方法に関する撮像方法情報を含む前記撮像条件を受け付け、前記撮像方法情報に対応する前記閾値を設定する、請求項5又は6に記載の口腔内撮像システム。
- 前記制御部は、有線によって前記制御装置と通信可能に構成されている、請求項1~7のいずれか一項に記載の口腔内撮像システム。
- 口腔内に配置された状態で、対象物を透過した放射線を検出する撮像装置であって、
前記放射線を検出する撮像部と、
制御装置と通信可能に構成されており、前記撮像部を制御する制御部と、
前記撮像部及び前記制御部を収容しているケースと、を備え、
前記撮像部は、前記対象物の像を取得するために前記放射線を検出する第1検出、及び前記放射線の線量をモニタするために前記放射線を検出する第2検出を実施し、
前記制御部は、
前記第1検出によって取得された第1信号、及び前記第2検出によって取得された第2信号を前記制御装置に送信し、
前記制御装置から制御コマンドを受信し、前記制御コマンドに従って前記撮像部を制御する、撮像装置。
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EP22752479.0A EP4260806A1 (en) | 2021-02-12 | 2022-01-04 | Intra-oral imaging system and imaging apparatus |
KR1020237026714A KR20230144540A (ko) | 2021-02-12 | 2022-01-04 | 구강 내 촬상 시스템 및 촬상 장치 |
US18/267,911 US20240057961A1 (en) | 2021-02-12 | 2022-01-04 | Intra-oral imaging system and imaging apparatus |
CN202280014216.6A CN116867437A (zh) | 2021-02-12 | 2022-01-04 | 口腔内摄像***和摄像装置 |
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JPH08275942A (ja) * | 1995-02-24 | 1996-10-22 | Loral Fairchild Corp | 中央読出口腔内画像センサ |
JPH11188033A (ja) * | 1997-12-26 | 1999-07-13 | Hamamatsu Photonics Kk | 歯科用x線像撮像装置および歯科用x線像撮像装置用モジュール |
JP2006246961A (ja) * | 2005-03-08 | 2006-09-21 | Hamamatsu Photonics Kk | X線撮像装置 |
JP5715960B2 (ja) | 2008-11-25 | 2015-05-13 | ソプロSopro | 多機能画像取得装置 |
US20200315434A1 (en) * | 2019-04-05 | 2020-10-08 | Align Technology, Inc. | Intraoral scanner sleeve authentication and identification |
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JPS6039505Y2 (ja) | 1980-07-02 | 1985-11-26 | いすゞ自動車株式会社 | 吸気加熱装置 |
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH08275942A (ja) * | 1995-02-24 | 1996-10-22 | Loral Fairchild Corp | 中央読出口腔内画像センサ |
JPH11188033A (ja) * | 1997-12-26 | 1999-07-13 | Hamamatsu Photonics Kk | 歯科用x線像撮像装置および歯科用x線像撮像装置用モジュール |
JP2006246961A (ja) * | 2005-03-08 | 2006-09-21 | Hamamatsu Photonics Kk | X線撮像装置 |
JP5715960B2 (ja) | 2008-11-25 | 2015-05-13 | ソプロSopro | 多機能画像取得装置 |
US20200315434A1 (en) * | 2019-04-05 | 2020-10-08 | Align Technology, Inc. | Intraoral scanner sleeve authentication and identification |
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CN116867437A (zh) | 2023-10-10 |
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EP4260806A1 (en) | 2023-10-18 |
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