Physics Bucharest 2017

Delivery uncertainties proton therapy

Hp Pencil beam scanning proton therapy requires the delivery of many thousand beams, each modulated for position, energy and monitor units, to provide a highly conformal patient treatment.

How treatment log files (record of the machine parameters) to investigate the integrity of treatment delivery compared to the nominal planned dose. Results → the integrity of treatment delivery is dependent on daily machine performance and is highly correlated with the accuracy of beam position. → Increased robustness gained by using multiple fields per series → Extra patient specific QA benefit!

TPS

Log files

g -eval

Local dose diff

Scandurra D, PMB (61) 2016