Characterization of a commercial scintillation detector for 2-D dosimetry in scanned proton and carbon ion beams
Characterization of a commercial scintillation detector for 2-D dosimetry in scanned proton and carbon ion beams
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DOI：
10.1016/j.ejmp.2017.01.011
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发表时间：
2017-02-01
影响因子：
3.4
通讯作者：
Ciocca, M.
中科院分区：
文献类型：
--
作者：
Russo, S.;Mirandola, A.;Ciocca, M.
CNAO使用的铅笔束扫描技术需要仔细评估和定期检查光束特性，以保证患者的安全。本研究旨在表征Lynx (R)探测器（IBA剂量测定），用于质子和碳离子束的调试和定期质量保证（QA），与目前用于质量保证检查的EBT3薄膜相比。方法和材料：Lynx (R)是一个二维高分辨率剂量测定系统，由一个闪烁屏幕和一个CCD相机组成，装在一个紧凑的不透光盒里。初步表征了该闪烁体的短期稳定性、与粒子数的线性关系、成像质量以及对虹膜设置和光束电流的响应依赖性；然后对Lynx (R)对EBT3薄膜进行系统测试。还评估了探测器响应对辐射LET的依赖。结果：初步结果表明Lynx适用于质子和碳离子扫描光束的调试和质量保证检查；与EBT3薄膜的交叉检查表明，两个探测器在单点和扫描场测量中都有很好的一致性。由于猝灭效应，闪烁体对LET的依赖性很强，因此Lynx (R)仅适用于相对二维剂量测量。结论：Lynx (R)似乎是质子和碳离子束调试和定期QA检查的有前途的工具。该检测器可作为EBT3薄膜的替代品，允许实时测量和分析，节省大量时间。(C) 2017年意大利医药工业协会。Elsevier Ltd.出版。版权所有。
Introduction: Pencil beam scanning technique used at CNAO requires beam characteristics to be carefully assessed and periodically checked to guarantee patient safety. This study aimed at characterizing the Lynx (R) detector (IBA Dosimetry) for commissioning and periodic quality assurance (QA) for proton and carbon ion beams, as compared to EBT3 films, currently used for QA checks.Methods and materials: The Lynx (R) is a 2-D high-resolution dosimetry system consisting of a scintillating screen coupled with a CCD camera, in a compact light-tight box. The scintillator was preliminarily characterized in terms of short-term stability, linearity with number of particles, image quality and response dependence on iris setting and beam current; Lynx (R) was then systematically tested against EBT3 films. The detector response dependence on radiation LET was also assessed.Results: Preliminary results have shown that Lynx is suitable to be used for commissioning and QA checks for proton and carbon ion scanning beams; the cross-check with EBT3 films showed a good agreement between the two detectors, for both single spot and scanned field measurements. The strong LET dependence of the scintillator due to quenching effect makes Lynx (R) suitable only for relative 2-D dosimetry measurements.Conclusion: Lynx (R) appears as a promising tool for commissioning and periodic QA checks for both protons and carbon ion beams. This detector can be used as an alternative of EBT3 films, allowing real-time measurements and analysis, with a significant time sparing. (C) 2017 Associazione Italiana di Fisica Medica. Published by Elsevier Ltd. All rights reserved.