Proceedings of the Korean Society of Medical Physics Conference (한국의학물리학회:학술대회논문집)

Korean Society of Medical Physics (한국의학물리학회)
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Proton Beam Dosimetry Intercomparison

  • Fukumura, Akifumi (Dept. of Medical Physics, Research Center for Charged Particle Therapy, National Institute of Radiological Sciences, Chiba) ;
  • Kanai, Tatsuaki (Dept. of Medical Physics, Research Center for Charged Particle Therapy, National Institute of Radiological Sciences, Chiba) ;
  • Kanematsu, Nobuyuki (Dept. of Medical Physics, Research Center for Charged Particle Therapy, National Institute of Radiological Sciences, Chiba) ;
  • Yusa, Ken (Dept. of Medical Physics, Research Center for Charged Particle Therapy, National Institute of Radiological Sciences, Chiba) ;
  • Maruhashi, Akira (Proton Medical Research Center, Univ. of Tsukuba) ;
  • Nohtomi, Akihiro (Proton Medical Research Center, Univ. of Tsukuba) ;
  • Nishio, Teiji (National Cancer Center East, Kashiwa) ;
  • Shimbo, Munefumi (National Cancer Center East, Kashiwa) ;
  • Akagi, Takashi (Hyogo Ion Beam Medical Center, Shingu) ;
  • Yanou, Toshihiro (Hyogo Ion Beam Medical Center, Shingu) ;
  • Fukuda, Shigekazu (Wakasa Wan Energy Research Center, Tsuruga) ;
  • Hasegawa, Takashi (Accelerator Engineering Corporation, Chiba) ;
  • Kusano, Yohsuke (Accelerator Engineering Corporation, Chiba) ;
  • Masuda, Yasutaka (Accelerator Engineering Corporation, Chiba)
  • Published : 2002.09.01
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Abstract

A new protocol for dosimetry in external beam radiotherapy is published by the Japan Society of Medical Physics (JSMP) in 2002. The protocol deals with proton and heavy ion beams as well as photon and electron beams, in accordance with IAEA Technical Report Series No. 398. To establish inter-institutional uniformity in proton beam dosimetry, an intercomparison program was carried out with the new protocol. The absorbed doses are measured with different cylindrical ionization chambers in a water phantom at a position of 30-mm residual range for a proton beam, that had range of 155 mm and a spread out Bragg peak (SOBP) of 60-mm width. As a result, the intercomparison showed that the use of the new protocol would improve the +/- 1.0 % (one standard deviation) and 2.7 % (maximum discrepancy) differences in absorbed doses stated by the participating institutions to +/- 0.3% and 0.9 %, respectively. The new protocol will be adopted by all of the participants.

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