SUBMILLIMETER PLANAR IMAGING WITH POSITRON EMITTERS - EGS4 CODE SIMULATION AND EXPERIMENTAL RESULTS

Experimental data for Planar Imaging with positron emitters (pulse hei ght, efficiency and spatial resolution) obtained with two matrices of 25 crystals (2 x 2 x 30 mm(3) each) of YAP:Ce coupled with a Position Sensitive PhotoMultiplier (Hamamatsu R2486-06) have been reproduced wi th high accuracy using the EGS4 code. Extensive simulation provides a detailed description of the performance of this type of detector as a function of the matrix granularity, the geometry of the detector and d etection threshold. We present the Monte Carlo simulation and the prel iminary experimental results of a prototype planar imaging system made of two matrices, each one consisting of 400 (2 x 2 x 30 mm(3)) crysta ls of YAP:Ce.