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  1. 原著論文

Calculation method using Clarkson integration for the physical dose at the center of the spread-out Bragg peak in carbon-ion radiotherapy

https://repo.qst.go.jp/records/46576
https://repo.qst.go.jp/records/46576
9f6d3ecd-d130-4b8d-974a-8d1425bba98c
Item type 学術雑誌論文 / Journal Article(1)
公開日 2013-07-30
タイトル
タイトル Calculation method using Clarkson integration for the physical dose at the center of the spread-out Bragg peak in carbon-ion radiotherapy
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 Tajiri, Minoru

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WEKO 464229

Tajiri, Minoru

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Maeda, Takamasa

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WEKO 464230

Maeda, Takamasa

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Koba, Yusuke

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Koba, Yusuke

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Isobe, Yosiharu

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Isobe, Yosiharu

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Kuroiwa, Toshitaka

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Kuroiwa, Toshitaka

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Fukuda, Shigekazu

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Fukuda, Shigekazu

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Tanimoto, Katsuyuki

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Tanimoto, Katsuyuki

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Shibayama, Kouichi

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Shibayama, Kouichi

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田尻 稔

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前田 貴雅

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古場 裕介

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磯部 喜治

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黒岩 俊隆

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福田 茂一

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谷本 克之

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柴山 晃一

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抄録
内容記述タイプ Abstract
内容記述 Purpose: In broad-beam carbon-ion radiotherapy performed using the heavy-ion medical accelerator in Chiba, the number of monitor units is determined by measuring the physical dose at the center of the spread-out Bragg peak (SOBP) for the treatment beam. The total measurement time increases as the number of treatment beams increases, which hinders the treatment of an increased number of patients. Hence, Kusano et al.[Jpn. J. Med. Phys. 23 (Suppl. 2), 65-68 (2003)] proposed a method to calculate the physical dose at the center of the SOBP for a treatment beam. Based on a recent study, the authors here propose a more accurate calculation method.
Methods: The authors measured the physical dose at the center of the SOBP while varying the circular field size and range-shifter thickness. The authors obtained the physical dose at the center of the SOBP for an irregularly shaped beam using Clarkson integration based on these measurements.
Results: The difference between the calculated and measured physical doses at the center of the SOBP varied with a change in the central angle of the sector segment. The differences between the calculated and measured physical doses at the center of the SOBP were within 1% for all irregularly shaped beams that were used to validate the calculation method.
Conclusions: The accuracy of the proposed method depends on both the number of angular intervals used for Clarkson integration and the fineness of the basic data used for calculations: sampling numbers for the field size and thickness of the range shifter. If those parameters are properly chosen, the authors can obtain a calculated monitor unit number with high accuracy sufficient for clinical applications.
書誌情報 Medical Physics

巻 40, 号 7, p. 071733-1-071733-5, 発行日 2013-07
ISSN
収録物識別子タイプ ISSN
収録物識別子 0094-2405
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