Optimization of a novel Cerenkov detector for radiotherapy applications using GEANT4 and FLUKA2011 IEEE Nuclear Science Symposium Conference Record

GEANT 4 and FLUKA are two well-established Montecarlo (MC) simulation codes used in high energy and medical physics fields. The main goals of this work are to optimize the design of a novel Cerenkov detector for radiotherapy applications and to compare the output of the two MC codes. The detector is based on a lead glass instead of a conventional scintillator, the Cerenkov photons generated by the secondary electrons with an energy greater than Cerenkov threshold inside the lead glass are collected by an inclined paraboloidal mirror and then focused on an off axis CMOS detector. The dimensions of the proposed Cerenkov detector are quite compact and, thus, we recon that it can be placed below the LINAC multi-leaf collimator. This will allow the online verification of IMRT treatments. A first preliminary step involved the optimization of the geometry of the paraboloidal mirror with respect to the position of the CMOS detector and lead glass. In order to do that a parallel beam of optical...