An FPGA Based energy correction method for one-to-one coupled PET detector: model and evaluation

A PET scanner based on silicon photomultipliers (SiPMs) has been widely used as an advanced nuclear medicine imaging technique that yields quantitative images of regional in vivo biology and biochemistry. The compact size the SiPM allows direct one to coupling between scintillation crystal photosensor, yielding better timing energy resolutions than light sharing methods have be photomultiplier tube (PMT) systems. To decrease volume readout electronics, a front end multiplexer with position decoder is common choice for system without highly integrated application specific circuit (ASIC). However, this case we cannot measure each crystal's deposited inspired by annihilation photon, so inter-crystal scatter (ICS) events will lead mispositioning then deteriorate detector intrinsic resolution. Besides, considering rejection within window resulting from gain dispersion nonlinear outputs SiPMs, correction mechanism needed. Yet, lack information introduce large error ICS events. For issue, online implemented Kintext-7 Field Programmable Gate Array (FPGA) device presented paper. Experiments laboratory were performed using 8 x segmented LYSO crystals coupled (J-series, ON Semiconductor) array which under 22Na point source excitation. Test results indicate both non-ICS can precisely corrected resolution 12 %. We also applied method actual clinical 68Ge line verify its multi-channel reliability.