The design of optimal multipinhole collimators for a seamless SPECT detector ring

The purpose of the study was to systematically design two multipinhole (MPH) collimators for a MR compatible seamless small animal SPECT detector ring (DR) that, for a given system resolution (SR), maximized detector area usage and achieved highest possible geometric efficiency (GE) within the system's design constraints. The SPECT DR consists of 5 rings of 19 2.56×2.56cm2 individual CZT detectors connected seamlessly with a total area of 62,259mm2. A set of multipinhole apertures was arranged on a cylindrical collimator sleeve (CS) and had a common-volume-of-view (CVOV) of 50mm diameter.