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

8th International Conference on 3D Radiation Dosimetry

Young, Tony^1 ; Xing, Aitang^1 ; Vial, Philp^1,2 ; Thwaites, David^2 ; Holloway, Lois^1,2,3,4 ; Arumugam, Sankar^1

Liverpool and Macarthur Cancer Therapy Centres, Ingham Institute, NSW, Australia^1

Institute of Medical Physics, School of Physics, University of Sydney, NSW, Australia^2

Centre for Medical Radiation Physics, University of Wollongong, NSW, Australia^3

Uinversity of New South Wales, NSW, Australia^4

关键词: Arc therapy;    Electronic portal imaging devices;    Head and neck;    Prostate treatment;    Treatment errors;    Treatment planning systems;    Treatment plans;    Volumetric modulated arc therapy;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/573/1/012021/pdf
DOI  :  10.1088/1742-6596/573/1/012021

来源: IOP

【 摘 要 】

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.