Analysis of the Penumbra for Uniform Irradiation Fields Delivered by a Wobbler method

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著者

    • TOMURA Hiromi
    • Divisin of Accelerator Physics and Engineering, National Institite of Radiological Sciences, Chiba, Japan
    • KANAI Tatsuaki
    • Divisin of Accelerator Physics and Engineering, National Institite of Radiological Sciences, Chiba, Japan
    • HIGASHI Akio
    • Charged Particle Treatment, Public Health and Environment department, Hyogo Prefectural Government, Kobe, Japan
    • FUTAMI Yasuyuki
    • Dvisin of Accelerator Physics and Engineering, National Institite of Radiological Sciences, Chiba, Japan
    • MATSUFUJI Naruhiro
    • Dvisin of Accelerator Physics and Engineering, National Institite of Radiological Sciences, Chiba, Japan
    • ENDO Masahiro
    • Divisin of Accelerator Physics and Engineering, National Institite of Radiological Sciences, Chiba, Japan
    • SOGA Fuminori
    • Divisin of Accelerator Physics and Engineering, National Institite of Radiological Sciences, Chiba, Japan
    • KAWACHI Kiyomitsu
    • Divisin of Accelerator Physics and Engineering, National Institite of Radiological Sciences, Chiba, Japan

抄録

In order to optimize the design of a beam-delivery system in heavy charged-particle therapy, we have developed an analytical method to calculate the sizes of the penumbra and field widths of a collimated beam. Such an analytical method is effective for optimization, and is earlier to calculate than using the Monte Carlo method. In the theoretical calculation, an exact distribution function was used, which took into account multiple-scattering and field broadening due to beam wobbling. The multiple scattering in the beam-delivery system was calculated using the Fermi-Eyges distribution function. In order to include the influence of field broadening due to beam wobbling, the Fermi-Eyges distribution function was integrated along the trajectory of the wobbled beam. The average and variance of the beam angle of the exact distribution function at the collimator were derived in order to calculate the penumbra and field width for the collimated beam. A simple formula for the penumbra size and field width was also deduced by assuming a uniform field, except for a peripheral region at the irradiation site. The calculated results by both an exact method and a simplified one were compared with the experimental results using therapeutic carbon beams with an energy per nucleon of 290,350 and 400 MeV. These results agreed well for almost all cases of the HIMAC beam.

収録刊行物

  • 放射線医学物理

    放射線医学物理 18(1), 42-56, 1998-03-31

    Japan Society of Medical Physics

参考文献:  23件中 1-23件 を表示

被引用文献:  5件中 1-5件 を表示

各種コード

  • NII論文ID(NAID)
    10003724302
  • NII書誌ID(NCID)
    AA11137895
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    09188010
  • データ提供元
    CJP書誌  CJP引用  J-STAGE 
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