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

[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.

[发布机构] 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