Optimization of the signal-to-background ratio in prompt gamma imaging using energy- and shifting time-of-flight discrimination: experiments with a scanning parallel-slit collimator

Much attention is currently being paid to imaging prompt gamma (PG) rays for in vivo proton range monitoring in proton therapy. PG imaging using a collimator is affected by neutron-related background. We study the effectiveness of background reduction experimentally, using a scanning parallel-slit PG collimator as a simplified model of a...