Design of a Mosaic BGO Detector System for Positron CT

A new scintillation detector system has been designed for application in high spatial resolution positron CT (PCT) system. Many small BGO crystals are closely packed and coupled to a position-sensitive photomultiplier tube (PMT). The detector performance and feasibility for PCT are discussed based on both calculations and experiments. The coincidence response function of approximately 3.2mm FWHM and coincidence time resolution of less than 6ns FWHM were obtained. The results promise the possibility of a new high resolution PCT system.