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波束扫描软件在使用多个阵列探测器从FFF波束配置中确定转折点时的准确性

Kanakavel Kandasamy¹, E James Jebaseelan Samuel¹

¹Department of Physics ,School of Advanced Sciences, VIT University, Vellore, India.

Asian Pacific journal of cancer prevention : APJCP

|June 25, 2024

概括

该 Beamscan 软件准确地确定了无平整波器 (FFF) 束形状中的拐点. 更高分辨率的测量提高了准确性,Beamscan提供了接近名义字段大小的FWHM值.

科学领域:

医学物理医学物理
辐射瘤学辐射瘤学
放射治疗物理物理

背景情况:

精确的辐射束形状的特征对于精确的放射治疗提供至关重要.
没有平面过器 (FFF) 的光束提供了剂量测量优势,但需要强大的分析方法.
PTW Beamscan 程序是一种用于分析束形状的工具,但其准确性需要验证.

研究的目的:

评估PTW Beamscan程序在识别无波器 (FFF) 束形状的曲点方面的准确性.
将Beamscan的性能与使用多个探测器的手动计算进行比较.
评估探测器分辨率对曲点和半最大全宽度 (FWHM) 确定准确性的影响.

主要方法:

用6FFF和10FFF光子能量的真光束线性加速器获得了配置测量.
他们使用了各种探测器,包括PTW 729,1500,1600 SRS阵列,Starcheck,Pinpoint 3D与Beamscan,以及Linac的EPID.
在Excel和Beamscan软件中使用一级衍生方法来定位拐点并计算FWHM.

主要成果:

在FWHM的差异因探测器和场的大小而异,在729阵列 (高达5.16毫米) 观察到的最大差异.
手动和软件分析之间的FWHM差异通常随着探测器分辨率的增加而减少.
对于15x15厘米2的场面大小,第一阶导数的峰值与大多数探测器的腔位相吻合.

结论:

更高的测量分辨率可以更准确地确定拐点和FWHM.
不管测量分辨率如何,Beamscan软件始终提供FWHM值更接近名义字段大小.
该 Beamscan 软件在常规分析 FFF 束形状时具有很高的准确性,与 Excel,Starcheck 和 EPID 数据有很好的一致性.

关键词:

1500 数组阵列阵列 EPID,星票,1600 SRS,729 和更多

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