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Range verification system using scintillator and CCD camera for the scanning irradiation system

https://repo.qst.go.jp/records/65708
https://repo.qst.go.jp/records/65708
abc422cd-0557-4ddc-a023-47a38eaf4473
Item type 会議発表用資料 / Presentation(1)
公開日 2015-07-21
タイトル
タイトル Range verification system using scintillator and CCD camera for the scanning irradiation system
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_c94f
資源タイプ conference object
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 早乙女, 直也

× 早乙女, 直也

WEKO 647250

早乙女, 直也

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原, 洋介

× 原, 洋介

WEKO 647251

原, 洋介

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丹正, 亮平

× 丹正, 亮平

WEKO 647252

丹正, 亮平

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皿谷, 有一

× 皿谷, 有一

WEKO 647253

皿谷, 有一

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水島, 康太

× 水島, 康太

WEKO 647254

水島, 康太

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古川, 卓司

× 古川, 卓司

WEKO 647255

古川, 卓司

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白井, 敏之

× 白井, 敏之

WEKO 647256

白井, 敏之

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野田, 耕司

× 野田, 耕司

WEKO 647257

野田, 耕司

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al., et

× al., et

WEKO 647258

al., et

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早乙女 直也

× 早乙女 直也

WEKO 647259

en 早乙女 直也

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原 洋介

× 原 洋介

WEKO 647260

en 原 洋介

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丹正 亮平

× 丹正 亮平

WEKO 647261

en 丹正 亮平

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皿谷 有一

× 皿谷 有一

WEKO 647262

en 皿谷 有一

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水島 康太

× 水島 康太

WEKO 647263

en 水島 康太

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古川 卓司

× 古川 卓司

WEKO 647264

en 古川 卓司

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白井 敏之

× 白井 敏之

WEKO 647265

en 白井 敏之

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野田 耕司

× 野田 耕司

WEKO 647266

en 野田 耕司

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抄録
内容記述タイプ Abstract
内容記述 Purpose
To compress the quality assurance time for the scanned carbon-ion beam system, we have been developed the novel range verification system using scintillator and CCD (charge-coupled device) camera.
Materials/Methods
A cylindrical plastic scintillator block and a CCD camera were installed on the black box. The range was determined by image processing. Reference range for each energy beam was determined the 80 percent of distal dose of the depth dose distribution that were measured by a large parallel-plate ionization chamber. Carbon beams ranging from 151.9 to 430 MeV/n were tested and compared with reference range. The common reference point of range is distal 80% of the dose distribution. In order to select the best reference point on a light distribution, the authors compared two range detection methods: threshold method (TH); the threshold positions set by the range from 10 to 90% of maximum value on the projected line are identified and difference of Gaussian (DOG) method. Using DOG method, range position is determined by zero-crossing position in the difference between small-Gaussian smoothed data and large-Gaussian smoothed data.
Results
The 1 mm range difference was clearly detected. Standard deviation of discrepancy from the range measured by the ionization chamber was less than 0.1 mm. A 1 mm setup error in the any direction was less than 0.2 mm range error. Conclusions
We have shown that the range of carbon beam can be determined with sub-millimeter accuracy using scintillator and CCD camera. The 80 percent of maximum value is minimized discrepancies between expected and measured ranges for carbon beam. It was supposed to be a result of the change of shape due to quenching effect. Since the system determine the range with short time and sufficient accuracy, it seems be that the system has potential to play the daily range check system.
会議概要(会議名, 開催地, 会期, 主催者等)
内容記述タイプ Other
内容記述 AAPM 57th Annual Meeting & Exhibition
発表年月日
日付 2015-07-16
日付タイプ Issued
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