Dosimetric impact of a change in breathing period on VMAT stereotactic ablative body radiotherapy

9th International Conference on 3D Radiation Dosimetry

Olding, T.^1,2 ; Alexander, K.M.^1

Department of Physics, Queen's University, Kingston

ON

K7L 3N6, Canada^1

Cancer Centre of South Eastern Ontario, Kingston General Hospital, 25 King Street West, Kingston

ON

K7L 5P9, Canada^2

关键词: Breathing rate;    Dosimetric impact;    Gel measurement;    Stereotactic ablative radiotherapies;    Volumetric modulated arc therapy;    Xylenol Orange;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/847/1/012032/pdf
DOI  :  10.1088/1742-6596/847/1/012032

来源: IOP

【 摘 要 】

The dosimetric impact of a change in breathing period during treatment was assessed for a volumetric modulated arc therapy (VMAT) stereotactic ablative radiotherapy (SABR) lung plan optimized according to our centre's planning protocol. Plan delivery was evaluated at three breathing rates ranging from 7 to 23 breaths-per-minute (BPM) against the planning anatomy (15 BPM) calculated dose. Dynamic ion chamber, EBT3 film and Fricke-xylenol orange-gelatin (FXG) gel measurements were acquired using a motion phantom with appropriate inserts for each dosimeter. The results show good agreement between measured and calculated plan dose within the internal gross tumour volume (IGTV) target.