Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2013, Vol. 24 ›› Issue (6): 060404 doi: 10.13538/j.1001-8042/nst.2013.06.021

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Optimization of ripple filter for pencil beam scanning

YANG Zhaoxia ZHANG Manzhou LI Deming*   

  1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
  • Contact: LI Deming E-mail:dmli@sinap.ac.cn
YANG Zhaoxia, ZHANG Manzhou, LI Deming. Optimization of ripple filter for pencil beam scanning.Nuclear Science and Techniques, 2013, 24(6): 060404     doi: 10.13538/j.1001-8042/nst.2013.06.021

Abstract:

This paper presents a novel approach to seek the bar width for ripple filter used in pencil beam scanning proton therapy. A weight decay quadratic programming method is employed for the new optimization strategy. Compared to the commonly used iterative-least-square technique, the ripple filter derived by the proposed method not only has better depth dose uniformity, i.e., the dose uniformity is within 0.5%, but also has triangle-like vertical cross-sectional shape which is suitable for manufacture. Moreover, the new method has such good robust characteristics that it is also applicable to the real application with unavoidable measurement errors and noises. The simulation results of this study may be helpful in improving the design of the ripple filter.

Key words: Dose uniformity, Proton therapy, Ripple filter, Weight decay quadratic programming