Sensitivity of collapsed arc QA method for delivery errors in Volumetric Modulated Arc Therapy (VMAT)

Authors

Tony Young, Liverpool and Macarthur Cancer Therapy CentresFollow
Aitang Xing, Liverpool and Macarthur Cancer Therapy Centres
Philip J. Vial, Liverpool and Macarthur Cancer Therapy Centres
David Thwaites, University of SydneyFollow
Lois C. Holloway, University of WollongongFollow
Sankar Arumugam, Liverpool and Macarthur Cancer Therapy Centres

RIS ID

100424

Publication Details

Young, T., Xing, A., Vial, P., Thwaites, D., Holloway, L. & Arumugam, S. (2015). Sensitivity of collapsed arc QA method for delivery errors in Volumetric Modulated Arc Therapy (VMAT). Journal of Physics: Conference Series, 573 012021-1 - 012021-4.

Abstract

In this paper the sensitivity of an Electronic Portal Imaging Device (EPID) to detecting introduced Volumetric Arc Therapy (VMAT) treatment errors was studied using the Collapsed Arc method. Two clinical Head and Neck (H& N) and Prostate treatment plans had gantry dependent dose and MLC errors introduced to the plans. These plans were then delivered to an Elekta Synergy Linear Accelerator EPID and compared to the original treatment planning system Collapsed Arc dose matrix. With the Collapsed Arc technique the EPID was able to detect MLC errors down to 2mm and dose errors of down to 3% depending on the treatment plan complexity and gamma tolerance used.