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The number of combinations of beam properties to measure for the commissioning is more than 7200, i.e. 201 energy steps, 3 intensities, and 12 gantry angles. To compress the commissioning time, quick and simple range verification system is required. In this work, we develop novel range verification system using scintillator and CCD (charge-coupled device) camera and estimate the accuracy of the range verification.\nMaterials/Methods: A cylindrical plastic scintillator block and a CCD camera were installed on the black box. The diameter of cylindrical scintillator block was 200 mm. The optical spatial-resolution of the system is 0.2 mm/pixels. The camera control system was connected and communicates with the measurement system that is part of the scanning system. 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. 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  1. 学会発表・講演等
  2. 口頭発表

Range Verification System for the Carbon Scanning Irradiation System

https://repo.qst.go.jp/records/65792
https://repo.qst.go.jp/records/65792
49d2cbc6-4f4a-40eb-aaf8-207de03f7ca8
Item type 会議発表用資料 / Presentation(1)
公開日 2015-10-29
タイトル
タイトル Range Verification System for the Carbon 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 648073

早乙女, 直也

Search repository
原, 洋介

× 原, 洋介

WEKO 648074

原, 洋介

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水島, 康太

× 水島, 康太

WEKO 648075

水島, 康太

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丹正, 亮平

× 丹正, 亮平

WEKO 648076

丹正, 亮平

Search repository
皿谷, 有一

× 皿谷, 有一

WEKO 648077

皿谷, 有一

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古川, 卓司

× 古川, 卓司

WEKO 648078

古川, 卓司

Search repository
白井, 敏之

× 白井, 敏之

WEKO 648079

白井, 敏之

Search repository
野田, 耕司

× 野田, 耕司

WEKO 648080

野田, 耕司

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早乙女 直也

× 早乙女 直也

WEKO 648081

en 早乙女 直也

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原 洋介

× 原 洋介

WEKO 648082

en 原 洋介

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水島 康太

× 水島 康太

WEKO 648083

en 水島 康太

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丹正 亮平

× 丹正 亮平

WEKO 648084

en 丹正 亮平

Search repository
皿谷 有一

× 皿谷 有一

WEKO 648085

en 皿谷 有一

Search repository
古川 卓司

× 古川 卓司

WEKO 648086

en 古川 卓司

Search repository
白井 敏之

× 白井 敏之

WEKO 648087

en 白井 敏之

Search repository
野田 耕司

× 野田 耕司

WEKO 648088

en 野田 耕司

Search repository
抄録
内容記述タイプ Abstract
内容記述 Purpose/Objective(s): Three-dimensional irradiation with a scanned carbon-ion beam has been performed from 2011 at our facility. We have been developed the rotating-gantry equipped with the scanning irradiation system. The number of combinations of beam properties to measure for the commissioning is more than 7200, i.e. 201 energy steps, 3 intensities, and 12 gantry angles. To compress the commissioning time, quick and simple range verification system is required. In this work, we develop novel range verification system using scintillator and CCD (charge-coupled device) camera and estimate the accuracy of the range verification.
Materials/Methods: A cylindrical plastic scintillator block and a CCD camera were installed on the black box. The diameter of cylindrical scintillator block was 200 mm. The optical spatial-resolution of the system is 0.2 mm/pixels. The camera control system was connected and communicates with the measurement system that is part of the scanning system. 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. Total 110 mono-energy carbon beams ranging from 151.9 to 430 MeV/n were tested and compared with reference range. Measured two-dimensional images were processed by in-house program developed by c++. The common reference point of range is distal 80% of the dose distribution. However the system measures the range not with the dose distribution but with the light 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 30, 50, 60, 70, 80, and 90% of maximum value on the projected line are identified and difference of Gaussian (DOG) method; DOG method is widely used in edge detection field instead of Laplacian filter. Using DOG method, range position is determined by zero-crossing position in the difference between small-Gaussian smoothed data and large-Gaussian smoothed data. Sigmas for small and large Gaussian are 1 and 1.5 pixels respectively.
Results: The 1 mm range difference was clearly divided. 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.
Conclusion: We have shown that the range of carbon pencil beam can be determined with subminiature 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 57th Annual meetin of ASTRO
発表年月日
日付 2015-10-18
日付タイプ Issued
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