Device and method for regulating intensity of beam extracted from a particle accelerator
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
A61N-005/01
A61N-005/10
H05H-013/00
출원번호
US-0479380
(2002-06-03)
우선권정보
EP-0870122 (2001-06-08)
국제출원번호
PCT/BE02/00089
(2003-11-25)
§371/§102 date
20031125
(20031125)
국제공개번호
WO02/10212
(2002-12-19)
발명자
/ 주소
Marchand, Bruno
Bauvir, Bertrand
출원인 / 주소
Ion Beam Applications S.A.
대리인 / 주소
Merchant &
인용정보
피인용 횟수 :
138인용 특허 :
3
초록▼
The invention concerns a device (10) for regulating the intensity of a beam extracted from a particle accelerator, such as a cyclotron, used for example for protontherapy, said particles being generated from an ion source. The invention is characterized in that it comprises at least: a comparator (9
The invention concerns a device (10) for regulating the intensity of a beam extracted from a particle accelerator, such as a cyclotron, used for example for protontherapy, said particles being generated from an ion source. The invention is characterized in that it comprises at least: a comparator (90) determining a difference ε between a digital signal IR representing the intensity of the beam measured at the output of the accelerator and a setpoint value IC of the beam intensity: a Smith predictor (80) which determines on the basis of the difference ε, a correct value of the intensity of the beam IP; an inverted correspondence table (40) supplying, on the basis of the corrected value of the intensity of the beam IP, a setpoint value IA for supply arc current from the ion source (20).
대표청구항▼
1. A device (10) for regulating the intensity of the beam extracted from a particle accelerator, such as a cyclotron, used for example for proton therapy, said particles being generated from an ion source, characterized in that it includes at least:a comparator (90), which determines a difference ε
1. A device (10) for regulating the intensity of the beam extracted from a particle accelerator, such as a cyclotron, used for example for proton therapy, said particles being generated from an ion source, characterized in that it includes at least:a comparator (90), which determines a difference ε between a digital signal IR representative of the beam intensity measured at the output of the accelerator and a setpoint value of the beam intensity IC; a Smith predictor (80), which determines a corrected value of the beam intensity IP on the basis of the difference ε; an inverted correspondence table (40), which provides a setpoint value IA for the supply of the arc current of the ion source (20) on the basis of the corrected value of the beam intensity IP. 2. The device as claimed in claim 1, characterized in that it furthermore comprises an analog-digital converter (50), which converts the analog signal IM directly representative of the beam intensity measured at the output of the accelerator and provides a digital signal IR.3. The device as claimed in claim 1, characterized in that it furthermore comprises:a lowpass filter (60), which filters the analog signal IM directly representative of the beam intensity measured at the output of the accelerator and provides a filtered analog signal IF; a phase lead controller (70), which samples the filtered analog signal IF, compensates for the phase lag introduced by the lowpass filter (60) and provides a digital signal IR to the comparator (90). 4. The device as claimed in claim 1, characterized in that it includes means for updating the content of the inverted correspondence table (40).5. The device as claimed in claim 1, characterized in that the sampling frequency is between 100 kHz and 200 kHz.6. The device as claimed in claim 1, characterized in that the cutoff frequency of the lowpass filter (60) is between 2 and 6 kHz.7. Use of the device as claimed in claim 1 in proton therapy, and in particular in the techniques of “Pencil Beam Scanning” and “double scattering”.8. A method for regulating the intensity of the beam extracted from a particle accelerator, such as a cyclotron, used for example for proton therapy, said particles being generated from an ion source (20), by means of a digital regulation device (10) operating at a given sampling frequency, characterized in that it comprises at least the following stages:the beam intensity (IM) is measured at the output of the particle accelerator; a digital signal IR representative of the measurement of the beam intensity (IM) is compared with the setpoint value IC of the beam intensity, by means of a comparator (90); a corrected value of the beam intensity IP is determined by means of a Smith predictor (80); a setpoint value IA for the supply of the arc current of the ion source (20) is determined, on the basis of the corrected value IP of the beam intensity, by means of an inverted correspondence table (40). 9. The regulation method as claimed in claim 8, characterized in that, after the measurement of the beam intensity at the output of the particle accelerator, the analog signal IM directly representative of the measured beam intensity is converted by means of an analog-digital converter (50) in order to obtain a digital signal IR.10. The method as claimed in claim 8, characterized in that after the measurement of the beam intensity at the output of the particle accelerator:the analog signal IM directly representative of the measured beam intensity is filtered by means of a lowpass filter (60), giving a filtered analog signal IF; the filtered analog signal IF is sampled, and the phase lag introduced by the filtering is compensated with the aid of a phase lead controller (70), in order to obtain a digital signal IR. 11. The method as claimed in claim 8, characterized in that the correspondence between a value IA for the supply of the arc current of the ion source (20) and a value IM of the beam intensity measured at the output of the accelerator is determined prior to the regulation.12. The method as claimed in claim 8, characterized in that, in the correspondence between a value IM of the beam intensity measured at the output of the accelerator and a value IA for the supply of the arc current of the ion source, the values of IA corresponding to the values of IM higher than a limit are replaced by the value of IA corresponding to this limit.13. Use of the method of as claimed in claim 7 in proton therapy, and in particular in the techniques of “Pencil Beam Scanning” and “double scattering”.
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