Energy window optimization of PET detectors for SPECT imaging

摘要

We developed add-on SPECT imaging capability on an animal PET scanner to implement a cost effective dual modality imaging system. Using PET detectors, designed for 511 keV photons, to acquire relatively low energy gamma rays from SPECT radionuclides has some inherent downsides, including the sub-optimal energy resolution and background radioactivity from 176Lu, a long-lived radioisotope of Lutetium that is present in most of the modern PET detector scintillators. To address these downsides, this study was carried out to optimize the detector energy window setting in SPECT imaging mode.