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Dose contributions from large-angle scattered particles in therapeutic carbon beams
https://repo.qst.go.jp/records/45033
https://repo.qst.go.jp/records/450337986b62c-8773-4d84-9f04-591a79d53caa
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2007-11-28 | |||||
| タイトル | ||||||
| タイトル | Dose contributions from large-angle scattered particles in therapeutic carbon beams | |||||
| 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 |
Kusano, Yohsuke
× Kusano, Yohsuke× Kanai, Tatsuaki× Kase, Yuuki× Matsufuji, Naruhiro× Komori, Masataka× Kanematsu, Nobuyuki× et.al× 金井 達明× 加瀬 優紀× 松藤 成弘× 小森 雅孝× 兼松 伸幸 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | In carbon therapy, doses at center of spread-out Bragg peaks depend on field size. For a small field of 5*5 cm2, the central dose reduces to 96% of the central dose for the open field in case of 400 MeV/n carbon beam. Assuming the broad beam injected to the water phantom is made up of many pencil beams, the transverse dose distribution can be reconstructed by summing the dose distribution of the pencil beams. We estimated dose profiles of this pencil beam through measurements of dose distributions of broad uniform beams blocked half of the irradiation fields. The dose at a distance of a few cm from the edge of the irradiation field reaches up to a few percent of the central dose. From radiation quality measurements of this penumbra, the large-angle scattered particles were found to be secondary fragments which have lower LET than primary carbon beams. Carbon ions break up in beam modifying devices or in water phantom through nuclear interaction with target nuclei. The angular distributions of these fragmented nuclei are much broader than those of primary carbon particles. The transverse dose distribution of the pencil beam can be approximated by a function of the three-Gaussian form. For a simplest case of mono-energetic beam, contributions of the Gaussian components which have large mean deviations become larger as the depth in the water phantom increases. ©2007 American Association of Physicists in Medicine | |||||
| 書誌情報 |
Medical Physics 巻 34, 号 1, p. 193-198, 発行日 2006-12 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 0094-2405 | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.1118/1.2402328 | |||||
