Clinical management of tumour volume changes in VMAT head & neck radiation treatment

[摘要] The impact of changing anatomy due to tumour shrinkage was assessed for a VMAT head & neck plan optimized according to our centre's planning protocol. A custom-built wax phantom accommodating ion chamber, MOSFET, EBT3 film and Fricke-xylenol orange-gelatin (FXG) gel dosimeters and a variable size bolus 'tumour' was used in the investigation. Results indicate that the practice of initiating a patient re-scan and verification plan is appropriate when a change in external body contour greater than 1 cm compared to the original anatomy is observed.

[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] Body contours;Clinical management;Gel dosimeter;Radiation treatments;Variable sizes;Verification plans;Volume change;Xylenol Orange