PIXEL IDENTIFICATION FOR SMALL PITCH SCINTILLATION CRYSTAL ARRAYS

Spatial intensity distributions of scintillation photons emitted by the scintillator array (5) in response to multiple incident gamma rays in record are recorded (S10). Sets of coincidently emitted scintillation photons from the recorded spatial intensity distributions are determined (S22). The sets of coincidently emitted scintillation photons center-of-gravity positions (S24) and cumulative energies are determined (S26). A clustering analysis based on the determined center-of-gravity positions and cumulative energies to obtain clusters (26a, 26b, 33) of gamma ray events attributed to a scintillator array element is performed (15). A cluster (26a, 26b, 33) of the spatial intensity distributions is cumulated (S29) to determine a cumulative spatial intensity distribution of scintillation photons emitted in response to incident gamma rays in the scintillator array element. A light matrix including expected spatial intensity distributions of scintillation photons for different scintillator array elements (15) is determined (S30) based on the cumulative spatial intensity distributions.