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Estimation and correction of produced light from prompt gamma photons on luminescence imaging of water for proton therapy dosimetry
https://repo.qst.go.jp/records/48548
https://repo.qst.go.jp/records/485482f5b4226-10aa-4d80-ad42-1cc538544bc9
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2018-02-28 | |||||
| タイトル | ||||||
| タイトル | Estimation and correction of produced light from prompt gamma photons on luminescence imaging of water for proton therapy dosimetry | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Yabe, (Nagoya Univ.) Takuya
× Yabe, (Nagoya Univ.) Takuya× Komori, (Nagoya Univ.) Masataka× Toshito, (Nagoya Proton Therapy Center) Toshiyuki× Yamaguchi, Mitsutaka× Kawachi, Naoki× Yamamoto, (Nagoya Univ) Seiichi× 山口 充孝× 河地 有木 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Although the luminescence images of water during proton-beam irradiation using a cooled charge-coupled device (CCD) camera showed almost the same ranges of proton beams as those measured by an ionization chamber, the depth profiles showed lower Bragg peak intensities than those measured by an ionization chamber. In addition, a broad optical baseline signal was observed in depths that exceed the depth of Bragg peak. We hypothesize that this broad baseline signal originates from interaction of proton-induced prompt gamma photons with water. These prompt gamma photons interact with water to form high-energy Compton electrons, which may cause luminescence or Cherenkov emission from depths exceeding the location of Bragg peak. To clarify this idea, we measured the luminescence images of water during the irradiations of protons in water with minimized parallax errors, and also simulated the produced light by the interactions of prompt gamma photons with water. We corrected the measured depth profiles of the luminescence images by subtracting the simulated distributions of the produced light by the interactions of prompt gamma photons in water. Corrections were also conducted using the estimated depth profiles of the light of the prompt gamma photons, as obtained from the off-beam areas of the luminescence images of water. With these corrections, we successfully obtained depth profiles that have almost identical distributions as the simulated dose distributions for protons. The percentage relative height of the Bragg peak with corrections to that of the simulation data increased to 94 % from 80 % without correction. Also, the percentage relative offset heights deeper part of Bragg peak with corrections decreased to 0.2 % ~ 0.4 % from 4 % without correction. These results indicate that the luminescence imaging of water has potential for the dose distribution measurements for proton therapy dosimetry. | |||||
| 書誌情報 |
Physics in Medicine & Biology 巻 63, 号 4, p. 04NT02-1-04NT02-8, 発行日 2018-02 |
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| 出版者 | ||||||
| 出版者 | IOP Publishing | |||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 1361-6560 | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.1088/1361-6560/aaa90c | |||||
| 関連サイト | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | https://doi.org/10.1088/1361-6560/aaa90c | |||||
| 関連名称 | https://doi.org/10.1088/1361-6560/aaa90c | |||||
