Online Parameter Identification and Control in the Commissioning of Nozzle for CIAE Proton Therapy System

A dedicated pencil beam scan system is developed and integrated into the proton therapy system of China Institute by a joint effort of Pyramid Consult Inc. and China Institute of Atomic Energy. In nozzle commissioning, a prozton beam with an intensity of tens nA is provided by the CIAE beam producti...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 2024-10, p.1-1
Main Authors: Yin, Zhiguo, Xiong, Rui, Guo, Qiankun, Liu, Chuanye, Zhang, Tianjue, Wang, Chuan, Zhao, Bohan, Ma, Yongjun
Format: Article
Language:English
Subjects:
Accuracy
commissioning
Ionization chambers
Laser beams
Magnetic separation
Nuclear power generation
Particle beams
pencil beam scanning
Proton therapy
proton therapy system
Protons
Real-time systems
Superconducting magnets
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Summary:A dedicated pencil beam scan system is developed and integrated into the proton therapy system of China Institute by a joint effort of Pyramid Consult Inc. and China Institute of Atomic Energy. In nozzle commissioning, a prozton beam with an intensity of tens nA is provided by the CIAE beam production system, including a 242MeV superconducting cyclotron and a fast energy variable beam transportation system. Most scanning devices are commercial products from the pyramid, including the ion chambers, helium beam path, magnet, and amplifier. A Scintillator camera system named Lynx from IBA provides position readouts of the beam spot during the commissioning. A dedicated controlling software and related strategy for the beam commission of the scanning system is developed by the CIAE team. In the commissioning, a straightforward irradiation consisting of 114 beam spots is carried out to evaluate the scanning magnets' nonlinearity and cross-talks. Afterward, Lynx generates these coordinates and analyzes them using the reported software. A modified 2D polynomial fitting, including Hyperbolic Functions, is invested in the commissioning to yield an open loop control accuracy in orders of millimeters. An iterative learning algorithm has also been developed to give even better accuracy. A 50mm separation irradiation map consisting of 37 points is carried out by combining these two corrections on the first commission day, reaching an accuracy of 0.55mm. An irradiation field of 250mmX250mm is also verified at the same time. The method and the first-day result will be reported in this paper.
ISSN:0018-9499
1558-1578
DOI:10.1109/TNS.2024.3476946