A Semiconductor Triple-Layered Compton Camera For Proton Therapy Verification

Measurement of prompt gamma-rays emitted during proton therapy is a promising technique for dosimetric and geometric verification of the treatment. The Compton camera developed at the University of Liverpool provides a superior alternative to the existing imaging modalities. Its suitability for the measurement of a high energy gamma-ray point source is investigated through the use of Monte Carlo simulation. The imaging efficiency was estimated to be 9:86 x 10(-5) for 1836 keV gamma-rays from Y-88 placed at 10 cm from the front of first detector. Given the observed gamma-ray flux, the Compton camera is feasible for the measurement of prompt gamma emission during proton therapy.