Dental radiology apparatus and signal processing method used therewith
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H01L-027/146
G01T-001/20
A61B-006/14
G03B-042/02
출원번호
US-0188497
(2011-07-22)
등록번호
US-8319190
(2012-11-27)
우선권정보
EP-03292901 (2003-11-21)
발명자
/ 주소
Boucly, Alain
Inglese, Jean-Marc
Congy, Philippe
출원인 / 주소
Carestream Health, Inc.
인용정보
피인용 횟수 :
0인용 특허 :
19
초록▼
A dental radiology apparatus having: an intraoral sensor comprising a detector that includes an active pixel array produced using biCMOS technology and converting a received x-ray into at least one analog electrical output signal; an electronic module encapsulated in a case and which has at least on
A dental radiology apparatus having: an intraoral sensor comprising a detector that includes an active pixel array produced using biCMOS technology and converting a received x-ray into at least one analog electrical output signal; an electronic module encapsulated in a case and which has at least one detector activation device, the module being linked to the sensor by a wire link for the transmission to said sensor of a detector activation signal generated in the module and for the transmission to the module of said at least one analog electrical output signal, the module having analog-digital means for converting said at least one analog electrical output signal into at least one digital output signal; and a remote processing and display unit of said at least one digital output signal which is linked to the electronic module by a wire link intended to ensure the transmission to the unit of said at least one digital output signal.
대표청구항▼
1. A signal processing method in a dental radiology apparatus comprising an intraoral sensor that includes an active pixel array produced using biCMOS technology, comprising: sampling of the data values held by the pixels of the array having been exposed to a radiation;generation of at least one sen
1. A signal processing method in a dental radiology apparatus comprising an intraoral sensor that includes an active pixel array produced using biCMOS technology, comprising: sampling of the data values held by the pixels of the array having been exposed to a radiation;generation of at least one sensor analog output signal based on the data values sampled on the pixels;conversion of said at least one analog output signal into one digital output signal;application of a correction to the analog output signal or to one of the analog output signals, to compensate in the digital output signal for any drifts due to the variations of the dark current in the array; andproducing a single analog output signal based on two symmetrical analog output signals. 2. The method according to claim 1, characterized in that the application step of a correction takes account of at least one value of a correction signal that is generated from the data values sampled on the array's pixels when it is not exposed to any radiation. 3. The method according to claim 2, characterized in that the correction signal is generated between two exposure phases of the array to radiation. 4. The method according to claim 2, characterized in that the correction signal is generated regularly over time. 5. The method according to claim 2, comprising steps of generation and analog-digital conversion of a sensor analog correction and output signal prior to the step of correction application. 6. The method according to claim 2, comprising a step of digital-analog conversion of at least one value of the digital correction signal into an analog correction signal that is applied to the analog output signal or to one of the analog output signals. 7. The method according to claim 1, characterized in that the step of producing a single analog output signal based on two analog output signals is a summing step of the two analog output signals. 8. The method according to claim 1, characterized in that the step of producing a single output signal is performed in a digital-analog converter. 9. The method according to claim 1, characterized in that the application step of a correction to the analog output signal or to one of the analog output signals is adjusted according to the law of variation according to the time of the dark current of the biCMOS active pixel array and the duration of use of this array. 10. The method according to claim 1, comprising a step of transmission of said at least one analog output signal to an electronic module remote from the sensor, the steps of conversion and correction application being performed in said remote module. 11. The method according to claim 10, comprising a transmission step of the compensated digital output signal from the remote electronic module to a remote signal processing and display unit. 12. The method according to claim 11, characterized in that the transmission is carried out using a wire link enabling a transmission speed at least equal to that of standard USB2.0. 13. The method according to claim 1, characterized in that it includes a prior step of reception by the sensor of x-rays having passed through at least one tooth. 14. The method according to claim 13, characterized in that it includes a later step of conversion into visible radiation of the received x-rays, the array's pixels being exposed to visible radiation. 15. A signal processing method in a dental radiology apparatus comprising an intraoral sensor that includes an active pixel array produced using biCMOS technology, comprising: sampling of the data values held by the pixels of the array having been exposed to a radiation;generation of at least one sensor analog output signal based on the data values sampled on the pixels;conversion of said at least one analog output signal into one digital output signal;application of a correction to the analog output signal or to one of the analog output signals, to compensate in the digital output signal for any drifts due to the variations of the dark current in the array; andproducing a single analog output signal based on two analog output signals, consecutive to the step of correction application to one of the two signals. 16. A dental radiology apparatus comprising an intraoral sensor including a detector having an active pixel array produced using biCMOS technology and converting x-rays received by the array into at least one analog output signal, the dental radiology apparatus comprising: an analog-digital converter for converting said at least one analog output signal into one digital output signal; anda signal corrector that is suited to applying a correction to the analog output signal or to one of the analog output signals, to compensate in the digital output signal for any drifts due to the variations of the dark current in the array; anda preparation circuit of a single analog output signal based on two symmetrical analog output signals. 17. The apparatus according to claim 16, characterized in that the corrector signal is suited to applying a correction according to at least one value of a correction signal that is generated from the data values sampled on the array's pixels when it is not exposed to any radiation. 18. The apparatus according to claim 17, characterized in that the detector is adjusted to generating a correction signal between two exposure phases of the array to x-rays. 19. The apparatus according to claim 17, characterized in that the detector is adjusted to generating a correction signal regularly over time. 20. The apparatus according to claim 17, comprising: means for generating a sensor analog correction and output signal; andmeans for the analog-digital conversion of said analog signal thus generated. 21. The apparatus according to claim 17, comprising a digital-analog converter to convert at least one value of the digital correction signal into an analog correction signal that is applied to the analog output signal or to one of the analog output signals. 22. The apparatus according to claims 21, characterized in that the digital-analog converter is linked at the output to one of the amplification means of one of the two analog output signals. 23. The apparatus according to claim 16, comprising a means of amplification of each of the two analog output signals. 24. The apparatus according to claim 16, characterized in that the analog output signals are symmetrical with one another. 25. The apparatus according to claim 16, characterized in that the production circuit of a single signal is either (a) a summing circuit of the two analog output signals or (b) is integrated in the analog-digital converter. 26. The apparatus according to claim 25, characterized in that the summing circuit is a differential operational amplifier. 27. The apparatus according to claim 16, comprising: an electronic module remote from the sensor and which includes the analog-digital converter and the signal corrector; anda link between the electronic module and the sensor to transmit said at least one analog output signal. 28. The apparatus according to claim 27, comprising a processing and display unit of said at least one output signal from the sensor that has been digitized and compensated, the unit being remote from the electronic module. 29. The apparatus according to claim 28, comprising, between the module and the processing and display unit, a communication wire link permitting a transmission speed at least equal to that of standard USB2.0 for the transmission of said at least one digitized and compensated output signal. 30. The apparatus according to claim 16, characterized in that the sensor has an x-ray converter that is capable of converting the x-rays that have passed through a tooth into visible radiation. 31. The apparatus according to claim 30, characterized in that the biCMOS detector including the active pixel array is capable of converting at least one part of the visible radiation coming from the conversion of the x-rays into at least one analog electrical signal.
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이 특허에 인용된 특허 (19)
Mouyen Francis (12 ; Avenue d\Occitanie 31520 Ramoville-Saint-Agne FRX), Apparatus for providing a dental radiological image and intra-oral sensor used therewith.
Zeller Uwe,DEX ; Gunther Werner,DEX ; Schulze-Ganzlin Ulrich,DEX ; Dobert Michael,DEX, Method and apparatus for producing X-ray exposures of body parts of a human.
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