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Organ-specific, targeted Field-of-View (FoV) Positron Emission Tomography(PET)/Magnetic Resonance Imaging (MRI) inserts are viable solutions for anumber of imaging tasks where whole-body PET/MRI systems lack the necessarysensitivity and resolution. To meet the required PET detector performance ofthese systems, high count-rates and effective spatial resolutions on the orderof a few mm, a novel two-axis patterned reflector foil pixelated scintillatorcrystal array design is developed and its proof-of-concept illustratedin-silico with the Monte Carlo radiation transport modelling toolkit Geant4. Itis shown that the crystal surface roughness and phased open reflectorcross-section patterns could be optimised to maximise either the PET radiationdetector's effective spatial resolution, or count rate before event pile up. Inaddition, it was illustrated that these two parameters had minimal impact onthe energy and time resolution of the proposed PET radiation detector design.Finally, it is shown that a PET radiation detector with balance performancecould be constructed using ground crystals and phased open reflectorcross-section pattern corresponding to the middle of the tested range.

A High Count-Rate and Depth-of-Interaction Resolving Single Layered One-Side Readout Pixelated Scintillator Crystal Array for PET Applications