中国物理B ›› 2008, Vol. 17 ›› Issue (12): 4673-4676.doi: 10.1088/1674-1056/17/12/058

• 8000 CROSSDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    

Off-axis dose distribution for rectangle proton beam

勾成俊, 罗正明, 黄初叶, 冯晓宁, 吴章文   

  1. Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education and Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China
  • 收稿日期:2008-05-01 修回日期:2008-06-01 出版日期:2008-12-20 发布日期:2008-12-20
  • 基金资助:
    Project supported by the State Key Program of National Natural Science of China (Grant No 10335050).

Off-axis dose distribution for rectangle proton beam

Gou Cheng-Jun (勾成俊), Luo Zheng-Ming (罗正明), Huang Chu-Ye (黄初叶), Feng Xiao-Ning (冯晓宁), Wu Zhang-Wen (吴章文)   

  1. Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education and Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China
  • Received:2008-05-01 Revised:2008-06-01 Online:2008-12-20 Published:2008-12-20
  • Supported by:
    Project supported by the State Key Program of National Natural Science of China (Grant No 10335050).

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摘要： This paper modifies an analytical algorithm originally developed for electron dose calculations to evaluate the off-axis dose distribution of rectangle proton beam. This spatial distribution could be described by Fermi-Eyges theory since a proton undergoes small-angle scattering when it passes through medium. Predictions of the algorithm for relative off-axis dose distribution by a 6cm*6cm initial monoenergetic proton beam are compared with the results from the published Monte Carlo simulations. The excellent level of agreement between the results of these two methods of dose calculation (<2%) demonstrates that the off-axis dose distribution from rectangle proton beam may be computed with high accuracy using this algorithm. The results also prompts the necessity to consider the off-axis distribution when the proton is applied to clinical radiotherapy since the penumbra is significant at the distal of its range (about 0.6cm at the Bragg-peak depth).

Abstract: This paper modifies an analytical algorithm originally developed for electron dose calculations to evaluate the off-axis dose distribution of rectangle proton beam. This spatial distribution could be described by Fermi-Eyges theory since a proton undergoes small-angle scattering when it passes through medium. Predictions of the algorithm for relative off-axis dose distribution by a 6cm*6cm initial monoenergetic proton beam are compared with the results from the published Monte Carlo simulations. The excellent level of agreement between the results of these two methods of dose calculation (<2%) demonstrates that the off-axis dose distribution from rectangle proton beam may be computed with high accuracy using this algorithm. The results also prompts the necessity to consider the off-axis distribution when the proton is applied to clinical radiotherapy since the penumbra is significant at the distal of its range (about 0.6cm at the Bragg-peak depth).

Key words: proton, radiotherapy, Fermi-Eyges

中图分类号:  (Dosimetry)

  • 87.57.uq
87.53.-j (Effects of ionizing radiation on biological systems) 87.53.Bn (Dosimetry/exposure assessment)