عنوان مقاله [English]
نویسندگان [English]چکیده [English]
In this study, a Compton camera imaging system including several scatter layers made of Si and a LYSO detector as absorber layer designed and simulated using Geant4. First, the efficiency of the system according to the number of scatter layers is optimized using a gamma point source with various energies. After finding the best structure of the system which include of 10 layers of scatter, 2 similar setup of Compton camera is placed in perpendicular to proton beam around the phantom to image the position of prompt gamma emission resulted by nuclear interaction of proton with phantom. In order to imaging the gammas, information such as interaction positions and deposited energies in scatters and absorber are recorded by Geant4 code in a root file. Then using a Compton camera reconstruction algorithm, production position profile of gammas is reconstructed in MATLAB. The Comparison of gamma distribution and dose distribution shows that this Compton camera structure is able to measure the proton range with less than 7 mm error which proves the ability of prompt gammas detection for verification of proton beam range during proton therapy.