Relation between Lineal Energy Distribution and Relative Biological Effectiveness for Photon Beams according to the Microdosimetric Kinetic Model

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概要

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• Our cell survival data showed the obvious dependence of RBE on photon energy: The RBE value for 200 kV X-rays was approximately 10% greater than those for mega-voltage photon beams. In radiation therapy using mega-voltage photon beams, the photon energy distribution outside the field is different with that in the radiation field because of a large number of low energy scattering photons. Hence, the RBE values outside the field become greater. To evaluate the increase in RBE, the method of deriving the RBE using the Microdosimetric Kinetic model (MK model) was proposed in this study. The MK model has two kinds of the parameters, tissue-specific parameters and the dose-mean lineal energy derived from the lineal energy distributions measured with a Tissue-Equivalent Proportional Counter (TEPC). The lineal energy distributions with the same geometries of the cell irradiations for 200 kV X-rays, 60Co γ-rays, and 6 MV X-rays were obtained with the TEPC and Monte Carlo code GEANT4. The measured lineal energy distribution for 200 kV X-rays was quite different from those for mega-voltage photon beams. The dose-mean lineal energy of 200 kV X-rays showed the greatest value, 4.51 keV/μm, comparing with 2.34 and 2.36 keV/μm for 60Co γ-rays and 6 MV X-rays, respectively. By using the results of the TEPC and cell irradiations, the tissue-specific parameters in the MK model were determined. As a result, the RBE of the photon beams (yD: 2~5 keV/μm) in arbitrary conditions can be derived by the measurements only or the calculations only of the dose-mean lineal energy.

• 2011-01-16

著者

• Saitoh Hidetoshi

  Graduate School Of Health Sciences Tokyo Metropolitan University

• Kanai Tatsuaki

  Heavy Ion Medical Center, Gunma University

• Kohno Toshiyuki

  Department Of Energy Sciences Tokyo Institute Of Technology

• FUJITA Yukio

  Graduate School of Health Sciences, Tokyo Metropolitan University

• Okamoto Hiroyuki

  Department Of Dermatology Kansai Medical University

• MATSUMOTO Yoshitaka

  Heavy-ion Radiobiology Research Group, National Institute of Radiological Sciences

• Saitoh Hidetoshi

  Graduate School Of Human Health Sciences Tokyo Metropolitan University

• Furusawa Yoshiya

  Heavy-ion Radiobiology Research Group National Institute Of Radiological Sciences

• Fujita Yukio

  Graduate School Of Human Health Sciences Tokyo Metropolitan University

• Kase Yuki

  Proton Therapy Division Shizuoka Cancer Center Research Institute

• Kanai Tatsuaki

  Heavy Ion Medical Center Gunma University

• Furusawa Yoshiya

  Heavy-ion Radiobiology Res. Group National Inst. Of Radiological Sciences

• Kanai Tatsuaki

  Heavy Ion Medical Center Gunma Univ.

• Itami Jun

  Radiation Oncology Division National Cancer Center Hospital

• Matsumoto Yoshitaka

  Heavy-ion Radiobiology Res. Group National Inst. Of Radiological Sciences

• Matsumoto Yoshitaka

  Heavy-ion Radiobiology Research Group National Institute Of Radiological Sciences

• Okamoto Hiroyuki

  Department Of Dermatology Faculty Of Medicine Kyoto University

• Furusawa Yoshiya

  Heavy-ion Radiobiol. Res. Gr. Res. Center Charged Particle Therapy Nirs.

• Okamoto Hiroyuki

  Department Of Energy Sciences Tokyo Institute Of Technology

• Okamoto Hiroyuki

  Department Of Agricultural Chemistry Kyoto University

• Kase Yuki

  Proton Therapy Div. Shizuoka Cancer Center Hospital

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