Radiotherapy Physics, Northern Ireland Cancer Centre, Belfast Health and Social Care Trust, UK.
Radiotherapy Physics, Northern Ireland Cancer Centre, Belfast Health and Social Care Trust, UK; Centre for Cancer Research, Queens University Belfast, UK.
Radiother Oncol. 2016 Mar;118(3):568-73. doi: 10.1016/j.radonc.2015.11.034. Epub 2016 Feb 26.
To provide a tool to enable gamma analysis software algorithms to be included in a quality assurance (QA) program.
Four image sets were created comprising two geometric images to independently test the distance to agreement (DTA) and dose difference (DD) elements of the gamma algorithm, a clinical step and shoot IMRT field and a clinical VMAT arc. The images were analysed using global and local gamma analysis with 2 in-house and 8 commercially available software encompassing 15 software versions. The effect of image resolution on gamma pass rates was also investigated.
All but one software accurately calculated the gamma passing rate for the geometric images. Variation in global gamma passing rates of 1% at 3%/3mm and over 2% at 1%/1mm was measured between software and software versions with analysis of appropriately sampled images.
This study provides a suite of test images and the gamma pass rates achieved for a selection of commercially available software. This image suite will enable validation of gamma analysis software within a QA program and provide a frame of reference by which to compare results reported in the literature from various manufacturers and software versions.
提供一种工具，使伽马分析软件算法能够包含在质量保证（QA）程序中。
创建了四个图像集，包括两个用于独立测试伽马算法的距离一致性（DTA）和剂量差（DD）元素的几何图像，一个临床分步照射 IMRT 场和一个临床 VMAT 弧。使用全局和局部伽马分析对这些图像进行分析，使用了 2 种内部开发的和 8 种商业可用的软件，涵盖了 15 个软件版本。还研究了图像分辨率对伽马通过率的影响。
除了一个软件外，所有软件都准确地计算了几何图像的伽马通过率。在 3%/3mm 和 1%/1mm 下，软件之间和软件版本之间的全局伽马通过率差异在 1%左右，对适当采样的图像进行分析可以得到更准确的结果。
本研究提供了一套测试图像以及商业可用软件的伽马通过率。该图像套件将能够在 QA 程序中验证伽马分析软件，并提供一个参考框架，用于比较来自不同制造商和软件版本的文献中报告的结果。
