Calibration method for radiation detector, and particle therapy system
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01T-007/00
A61N-005/10
G01T-001/29
출원번호
US-0776002
(2013-02-25)
등록번호
US-9188685
(2015-11-17)
우선권정보
JP-2012-043532 (2012-02-29)
발명자
/ 주소
Takayanagi, Taisuke
Nishiuchi, Hideaki
Tadokoro, Masahiro
Fujii, Yusuke
Sakae, Takeji
Terunuma, Toshiyuki
출원인 / 주소
HITACHI, LTD.
대리인 / 주소
Mattingly & Malur, PC
인용정보
피인용 횟수 :
3인용 특허 :
0
초록▼
A stacked type of radiation detector and a calibration method that enables the radiation detector to correct variations in sensor-specific output easily and within a short time, without using a water-phantom dose detector. The radiation detector is equipped with a sensor section including a pluralit
A stacked type of radiation detector and a calibration method that enables the radiation detector to correct variations in sensor-specific output easily and within a short time, without using a water-phantom dose detector. The radiation detector is equipped with a sensor section including a plurality of sensors arranged in layers in a traveling direction of a particle beam. A dummy absorber has water-equivalent thickness equal to an average water-equivalent thickness of the sensors. A signal-processing unit calculates sensor-specific calibration coefficients using a measurement result obtained during irradiation of the radiation detector with the radiation when electrical signals developed in each sensor are measured, and a measurement result obtained during irradiation of the radiation detector with the radiation when the sensor section is moved in the traveling direction of the radiation, then the dummy absorber is set in place, and electrical signals developed in each sensor are measured.
대표청구항▼
1. A radiation detector comprising: a sensor section having radiation sensors stacked on one another;a dummy absorber with a water-equivalent thickness equal to an average water-equivalent thickness of the stacked radiation sensors;a dummy absorber driving control section configured to place the dum
1. A radiation detector comprising: a sensor section having radiation sensors stacked on one another;a dummy absorber with a water-equivalent thickness equal to an average water-equivalent thickness of the stacked radiation sensors;a dummy absorber driving control section configured to place the dummy absorber at an anterior position in a direction of measurement by the sensor section, with the anterior position corresponding to a position at the line where radiation propagates;a sensor section driving control device configured to move the sensor section through a distance equal to average thickness of the stacked radiation sensors, at the line where the radiation propagates; anda signal-processing unit for calculating calibration coefficients for each radiation sensor, from measurement results output from the radiation detector when the dummy absorber is placed at the anterior position, measurement results output from the radiation detector when the dummy absorber is not placed at the anterior position, and an integrated extraction dose value of the radiation extracted during acquisition of the two sets of measurement results. 2. The radiation detector according to claim 1, wherein on a basis of whichever measurement results the signal-processing unit acquires earlier of the two sets of measurement results output from the radiation detector, one set being output when the dummy absorber is placed at the anterior position, and one set being output from the radiation detector when the dummy absorber is not placed at the anterior position, the sensor section driving control device determines a direction in which the sensor section is to be moved at the line where the radiation propagates, and the sensor section driving control device is configured to move the sensor section in the determined direction. 3. The radiation detector according to claim 2, wherein if the measurement results output from the radiation detector when the dummy absorber is placed at the anterior position are acquired earlier than the measurement results output from the radiation detector when the dummy absorber is not placed at the anterior position, the sensor section driving control device is configured to move the sensor section in a direction opposite to a traveling direction of the radiation, at the line where the radiation propagates. 4. The radiation detector according to claim 2, wherein if the measurement results output from the radiation detector when the dummy absorber is not placed at the anterior position are acquired earlier than the measurement results output from the radiation detector when the dummy absorber is placed at the anterior position, the sensor section driving control device is configured to move the sensor section in a traveling direction of the radiation, at the line where the radiation propagates. 5. The radiation detector according to claim 2, wherein the dummy absorber is the same member as a radiation sensor of the radiation sensors. 6. The radiation detector according to claim 2, further comprising: fixing jigs for fixing the dummy absorber to the anterior position;wherein the fixing jigs are fitted in the radiation detector. 7. The radiation detector according to claim 2, further comprising: a range shifter; anda range shifter driving control device for driving the range shifter;wherein the dummy absorber driving control section is the range shifter driving control device; andwherein the range shifter driving control device drives the range shifter by controlling the dummy absorber to ensure that the range shifter has water-equivalent thickness equal to that of the dummy absorber. 8. The radiation detector according to claim 2, further comprising: a range shifter; anda range shifter driving control device for driving the range shifter;wherein the dummy absorber driving control section is the range shifter driving control device; andwherein the range shifter driving control device drives the dummy absorber in addition to the range shifter. 9. A particle therapy system with the radiation detector of claim 2, wherein the integrated extraction dose value is acquired by a dose monitor equipped on a particle beam irradiation apparatus of the particle therapy system. 10. A particle therapy system with the radiation detector of claim 2, further comprising: a couch; anda couch driving control device;wherein the sensor section driving control device is the couch driving control device. 11. The radiation detector according to claim 1, wherein if the measurement results output from the radiation detector when the dummy absorber is placed at the anterior position are acquired earlier than the measurement results output from the radiation detector when the dummy absorber is not placed at the anterior position, the sensor section driving control device is configured to move the sensor section in a direction opposite to a traveling direction of the radiation, at the line where the radiation propagates. 12. The radiation detector according to claim 1, wherein if the measurement results output from the radiation detector when the dummy absorber is not placed at the anterior position are acquired earlier than the measurement results output from the radiation detector when the dummy absorber is placed at the anterior position, the sensor section driving control device is configured to move the sensor section in a traveling direction of the radiation, at the line where the radiation propagates. 13. The radiation detector according to claim 1, wherein the dummy absorber is the same member as a radiation sensor of the radiation sensors. 14. The radiation detector according to claim 1, further comprising: fixing jigs for fixing the dummy absorber to the anterior position;wherein the fixing jigs are fitted in the radiation detector. 15. The radiation detector according to claim 1, further comprising: a range shifter; anda range shifter driving control device for driving the range shifter;wherein the dummy absorber driving control section is the range shifter driving control device; andwherein the range shifter driving control device drives the range shifter by controlling the dummy absorber to ensure that the range shifter has water-equivalent thickness equal to that of the dummy absorber. 16. The radiation detector according to claim 1, further comprising: a range shifter; anda range shifter driving control device for driving the range shifter;wherein the dummy absorber driving control section is the range shifter driving control device; andwherein the range shifter driving control device drives the dummy absorber in addition to the range shifter. 17. A particle therapy system with the radiation detector of claim 1, wherein the integrated extraction dose value is acquired by a dose monitor equipped on a particle beam irradiation apparatus of the particle therapy system. 18. A particle therapy system with the radiation detector of claim 1, further comprising: a couch; anda couch driving control device;wherein the sensor section driving control device is the couch driving control device. 19. A calibration method for a radiation detector including a sensor section having radiation sensors stacked one another, the method comprising: acquiring a first measurement result by measuring radiation passing through the sensor section;placing, at an anterior position in a direction of measurement by the sensor section, with the anterior position corresponding to a position at the line where the radiation propagates, a dummy absorber having water-equivalent thickness equal to average water-equivalent thickness of the stacked radiation sensors;moving the sensor section through a distance equal to average thickness of the stacked radiation sensors, in a traveling direction of the radiation, at the line where the radiation propagates;acquiring a second measurement result by measuring the radiation passing through the sensor section after passing through the absorber; andcalculating calibration coefficients for each of the radiation sensors, from the first measurement result, the second measurement result, and an integrated extraction dose of the radiation extracted during the acquisition of the first measurement result and the second measurement result. 20. A calibration method for a radiation detector including a sensor section having radiation sensors stacked one another, the method comprising: placing, at an anterior position in a direction of measurement by the sensor section, with the anterior position corresponding to a position at the line where radiation propagates, a dummy absorber having water-equivalent thickness equal to average water-equivalent thickness of the stacked radiation sensors;acquiring a first measurement result by measuring the radiation passing through the sensor section after passing through the absorber;removing the dummy absorber from the line where the radiation propagates;moving the sensor section through a distance equal to average thickness of the stacked radiation sensors, in a traveling direction of the radiation, at the line where the radiation propagates;acquiring a second measurement result by measuring the radiation passing through the sensor section; andcalculating calibration coefficients for each of the radiation sensors, from the first measurement result, the second measurement result, and an integrated extraction dose of the radiation extracted during the acquisition of the first measurement result and the second measurement result.
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