Test of Compton camera components for prompt gamma imaging at the ELBE bremsstrahlung beam

摘要: In the context of ion beam therapy, particle range verification is a major challenge for quality assurance treatment. One approach measurement prompt gamma rays resulting from tissue irradiation. A Compton camera based on several position sensitive ray detectors, together with an imaging algorithm, expected to reconstruct emission density map, which correlated dose distribution. At OncoRay and Helmholtz-Zentrum Dresden-Rossendorf (HZDR), setup being developed consisting two scatter planes: CdZnTe (CZT) cross strip absorber one Lu2SiO5 (LSO) block detector. The data acquisition VME electronics handled by software ROOT framework. has been tested at linear electron accelerator ELBE HZDR, used in this experiment produce bunched bremsstrahlung photons up 12.5 MeV energy repetition rate 13 MHz. Their spectrum similarities shape clinical environment, flux also frequency. charge sharing effect CZT detector studied qualitatively different ranges. LSO pixel discrimination resolution analyzed it shows trend improve high depositions. time correlation between pulsed measured signals, be background suppression, exhibits 3 ns FWHM 2 walk correction pixel-wise calibration applied detector, whose improves 630 ps. conclusion, suitable time-resolved suppression accelerators. Ongoing tasks are quantitative comparison simulations test algorithms. Experiments proton accelerators have performed currently under analysis.