A scheme design of collimator for gantry in proton therapy facility

In proton radiotherapy, a round dose profile at the isocenter is beneficial to the treatment planning in the active scanning mode. Based on the theory of the round-beam method, a collimator was designed to be placed at the entrance of the gantry. A simulation of Monte Carlo method was done to valida...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2015-08, Vol.791, p.47-53
Main Authors: Liu, Ming, Yin, Chongxian, Chu, Kecheng, Zhao, Liying, Shu, Hang, Dai, Xiaolei, Zhang, Manzhou, Miao, Chunhui
Format: Article
Language:English
Subjects:
Active scanning
Collimator
Monte Carlo method
Proton therapy
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Summary:In proton radiotherapy, a round dose profile at the isocenter is beneficial to the treatment planning in the active scanning mode. Based on the theory of the round-beam method, a collimator was designed to be placed at the entrance of the gantry. A simulation of Monte Carlo method was done to validate the design scheme. With the constraining function of the collimator, the dose profile at the isocenter would maintain a round shape despite of an initial asymmetric phase space in extraction of synchrotron. Furthermore, the shape of dose profile is irrelevant to the rotating angle of the gantry. The mechanical error caused by the axis deviation of the gantry could also be partly eliminated with the collimator.
ISSN:0168-9002
1872-9576
DOI:10.1016/j.nima.2015.04.045