Evaluation of a compact, high-resolution SPECT detector based on digital silicon photomultipliers

摘要: MicroSPECT is one of the main functional imaging techniques used in preclinical setting. Even though high-resolution images can be obtained with currently available systems, their sensitivity often quite low due to use multi-pinhole collimation. This results long acquisition times and hampers dynamic imaging. However, it has already been shown that this limited overcome using detectors. In article, we therefore investigated a digital photon counter (DPC) combination 2 mm thick monolithic LYSO crystal for SPECT These light sensors contain arrays avalanche photodiodes whose signals are directly digitised. The DPCs have advantage they very compact, high intrinsic resolution, MR compatible allow disabling cells dark count rate. order investigate influence temperature dependent rate on detector performance, compared at 3 °C 18 °C. At °C, observed an energy resolution 28.8% spatial 0.48 mm. Furthermore, 10% loss 60 kcps. Next, looked event caused by higher found 5% measurements. becomes 29.2% decreases 0.52 Due loss, increases 63 A small degradation performance thus °C.These show usefulness together its excellent resolution. drawback low, spatially varying detection efficiency better still acceptable