Detecting VMAT delivery errors: A study on the sensitivity of the ArcCHECK-3D electronic dosimeter

7th International Conference on 3D Radiation Dosimetry

Arumugam, S.^1 ; Xing, A.^1 ; Goozee, G.^1,2 ; Holloway, L.^1,3,4

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

University of New South Wales, Sydney, NSW, Australia^2

Institute of Medical Physics, School of Physics, University of Sydney, Sydney, NSW, Australia^3

Centre for Medical Radiation Physics, University of Wollongong, Wollongong, NSW, Australia^4

关键词: 3d dosimeters;    Dose comparison;    Electronic dosimeter;    Individual control;    Positional errors;    Positioning error;    Tolerance levels;    Treatment planning systems;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/444/1/012019/pdf
DOI  :  10.1088/1742-6596/444/1/012019

来源: IOP

【 摘 要 】

The sensitivity of the ArcCHECK 3D dosimeter in detecting VMAT delivery errors has been investigated. Dose and leaf positional errors of different magnitudes were introduced to whole arc and individual control points (CPs) of a simple open arc VMAT plan. The error introduced and error free plans were delivered and measured using the ArcCHECK device. The measured doses were compared against the treatment planning system calculated doses using gamma (γ) criteria with 2%/2mm and 3%/3mm tolerance levels. ArcCHECK effectively detected the dose errors resulting from MLC leaf positioning errors in limited CPs and Whole arc. For errors introduced to MU, ArcCHECK effectively detected the MU delivery errors in whole arc but not the MU errors introduced to CPs in integrated dose comparison.