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  1. 原著論文

Development of a new ridge filter with honeycomb geometry for a pencil beam scanning system in particle radiotherapy

https://repo.qst.go.jp/records/48318
https://repo.qst.go.jp/records/48318
93c9c913-a2dc-48b3-86ae-ee27e59c78d5
Item type 学術雑誌論文 / Journal Article(1)
公開日 2017-08-21
タイトル
タイトル Development of a new ridge filter with honeycomb geometry for a pencil beam scanning system in particle 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 Tansho, Ryohei

× Tansho, Ryohei

WEKO 485596

Tansho, Ryohei

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Furukawa, Takuji

× Furukawa, Takuji

WEKO 485597

Furukawa, Takuji

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Hara, Yousuke

× Hara, Yousuke

WEKO 485598

Hara, Yousuke

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Mizushima, Kota

× Mizushima, Kota

WEKO 485599

Mizushima, Kota

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Saotome, Naoya

× Saotome, Naoya

WEKO 485600

Saotome, Naoya

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Saraya, Yuichi

× Saraya, Yuichi

WEKO 485601

Saraya, Yuichi

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Shirai, Toshiyuki

× Shirai, Toshiyuki

WEKO 485602

Shirai, Toshiyuki

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Noda, Koji

× Noda, Koji

WEKO 485603

Noda, Koji

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丹正 亮平

× 丹正 亮平

WEKO 485604

en 丹正 亮平

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古川 卓司

× 古川 卓司

WEKO 485605

en 古川 卓司

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原 洋介

× 原 洋介

WEKO 485606

en 原 洋介

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水島 康太

× 水島 康太

WEKO 485607

en 水島 康太

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早乙女 直也

× 早乙女 直也

WEKO 485608

en 早乙女 直也

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皿谷 有一

× 皿谷 有一

WEKO 485609

en 皿谷 有一

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白井 敏之

× 白井 敏之

WEKO 485610

en 白井 敏之

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野田 耕司

× 野田 耕司

WEKO 485611

en 野田 耕司

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抄録
内容記述タイプ Abstract
内容記述 A ridge filter (RGF), a beam energy modulation device, is usually used for particle radiotherapy with a pencil beam scanning system. The conventional RGF has a one-dimensional (1D) periodic laterally stepped structure in orthogonal plane with a central beam direction. The energy of a beam passing through the different thicknesses of the stepped RGF is modulated. Although the lateral pencil beam size is required to cover the several stepped RGF units to modulate its energy as designed, the current trend is to decrease lateral beam size to improve the scanning system. As a result, the beam size becomes smaller than the size of the individual RGF unit. The aim of this study was to develop a new RGF with two-dimensional (2D) honeycomb geometry to simultaneously achieve both a decrease in lateral beam size and the desired energy modulation.
The conventional 1D-RGF and the 2D-RGF with honeycomb geometry were both designed so that the Bragg peak size of a 79 MeV/u carbon ion pencil beam in water was 1 mm RMS in the beam direction. To validate the design of the 2D-RGF, we calculated depth dose distributions in water using a simplified Monte Carlo method. In the calculations, we decreased the lateral pencil beam size at the entrance of the RGF and investigated the threshold of lateral beam size with which the pencil beam can reproduce the desired Bragg peak size for each type of RGF. In addition, we calculated lateral dose distributions in air downstream from the RGF and evaluated the inhomogeneity of the lateral dose distributions.
Using the 2D-RGF, the threshold of lateral beam size with which the pencil beam can reproduce the desired Bragg peak size was smaller than that using the 1D-RGF. Moreover, the distance from the RGF at which the lateral dose distribution becomes uniform was shorter using the 2D-RGF than that using the 1D-RGF. These results indicate that when the periodic length of both RGFs is the same, the 2D-RGF allows use of a pencil beam with smaller lateral beam size and a shorter distance from the RGF to the target, resulting in improvement in the conformity of dose distribution in a tumor.
書誌情報 Nuclear Instruments and Methods in Physics Research Section B

巻 406, 号 A, p. 352-355, 発行日 2016-10
出版者
出版者 Elsevier Science
DOI
識別子タイプ DOI
関連識別子 10.1016/j.nimb.2016.10.009
関連サイト
識別子タイプ URI
関連識別子 http://www.sciencedirect.com/science/article/pii/S0168583X16304311
関連名称 http://www.sciencedirect.com/science/article/pii/S0168583X16304311
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