A Cross-Stack Quasi-Monolithic Detector with DOI Capability for a Small Animal PET

Abstract

We report on a new design of the detector module with depth of interaction (DOI) based Oil a quasi-monolithic lutetium oxyorthosilicate (LSO) crystal, a multi-channel sensor and a maximum-likelihood position-estimating (MLPE) algorithm. tit our detector design, two layers of quasi-monolithic crystal elements are stacked crosswise. Each layer consists of eight crystals, which are separated from cacti other in one direction and are monolithic in the other direction. size of each crystal is 2.0 x 16.0 x 10.0 mm(3). The light. transport and detection in the cross-stack quasi-monolithic. detector were modeled using the DETECT2000 code and the lookup tables (LUTs) were built using simulations. Events were well separated by applying the MLPE method with a 2.0-mm spatial resolution in the X-Y plane and for four depths in the DOI direction. The results demonstrated that the proposed detector provided dependable positioning capability for a small animal positron emission tomography (PET).