Estimation and correction of Cerenkov-light on luminescence image of water for carbon-ion therapy dosimetry

Takuya Yabe, Takashi Akagi, Seiichi Yamamoto*

*この研究の対応する著者

研究成果: Article査読

11 被引用数 (Scopus)

抄録

Purpose: The luminescence images of water during the irradiation of carbon-ions provide useful information such as the ranges and the widths of carbon-ion beams. However, measured luminescence images show higher intensities in shallow depths and wider lateral profiles than those of the dose distributions. These differences prevent the luminescence imaging of water from being applied to a quality assurance for carbon-ion therapy. We assumed that the differences were due to the contaminations of Cerenkov-light from the secondary electrons of carbon-ions as well as the prompt gamma photons in the measured image. In this study, we applied a correction method to a luminescence image of water during the irradiation of carbon-ion beams. Methods: We estimated the distribution of the Cerenkov-light in water during the irradiation of carbon-ions by Monte Carlo simulation and subtracted the simulated Cerenkov-light from the depth and lateral profiles of the measured luminescence image for 241.5 MeV/u-carbon-ions. Results: With these corrections, we successfully obtained depth and lateral profiles whose distributions are almost identical to the dose distributions of carbon-ions. The high intensities in the shallow depth areas decreased and the Bragg peak intensity increased. The beam widths of the measured images approached those of the ionization chamber. Conclusions: These results indicate that the luminescence imaging of water with our proposed correction has potential to be used for dose distribution measurements for carbon-ion therapy dosimetry.

本文言語English
ページ(範囲)118-124
ページ数7
ジャーナルPhysica Medica
74
DOI
出版ステータスPublished - 2020 6月
外部発表はい

ASJC Scopus subject areas

  • 生物理学
  • 放射線学、核医学およびイメージング
  • 物理学および天文学(全般)

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