Christina E Agnew1, Conor K McGarry2. 1. Radiotherapy Physics, Northern Ireland Cancer Centre, Belfast Health and Social Care Trust, UK. Electronic address: christina.agnew@belfasttrust.hscni.net. 2. Radiotherapy Physics, Northern Ireland Cancer Centre, Belfast Health and Social Care Trust, UK; Centre for Cancer Research, Queens University Belfast, UK.
Abstract
PURPOSE: To provide a tool to enable gamma analysis software algorithms to be included in a quality assurance (QA) program. METHODS: 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. RESULTS: 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. CONCLUSION: 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.
PURPOSE: To provide a tool to enable gamma analysis software algorithms to be included in a quality assurance (QA) program. METHODS: 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. RESULTS: 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. CONCLUSION: 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.
Authors: Muhammad Zamir Mohyedin; Hafiz Mohd Zin; Mohd Zulfadli Adenan; Ahmad Taufek Abdul Rahman Journal: Polymers (Basel) Date: 2022-07-16 Impact factor: 4.967