Development of event reconstruction algorithm for full-body gamma-camera based on SiPMs

The gamma-camera is the detector for nuclear medical imaging where the photomultiplier tubes (PMTs) could be replaced by the silicon photomultipliers (SiPMs). Common systems have the energy resolution about 10% and intrinsic spatial resolution about 3 mm (FWHM). In order to achieve the requirement energy and spatial resolution the classical Anger's logic should be modified. In case of a standard monolithic thallium activated sodium iodide scintillator (500x400x10 mm³) and SiPM readout it could be done with identification of the clusters. We show that this approach has a good results with the simulated data. (paper)