Abstract

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

Highlights

  • O RGAN-SPECIFIC, targeted field-of-view (FoV) positron emission tomography (PET)/magnetic resonance imaging (MRI) inserts are viable solutions for a number of imaging tasks where whole-body PET/MRI systems lack the necessary sensitivity and resolution [1]–[4]

  • As is typically observed in crystal array-based PET radiation detectors, the effective energy resolution in the central region of the array is generally superior to the edge and corner regions for all crystal surface type and phase shifted insert (PSI) combinations [38], [39]

  • Since these two FoMs can be linked to effective spatial resolution and maximum count rate before event pile-up, i.e., greated LR restriction would reduce the cross-talk between 3×3 silicon photomultipliers (SiPMs) pixel footprint regions, it means that a native tradeoff exists between these two crucial performance characteristics of the proposed PET radiation detector design [6], [38], [39]

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Summary

Introduction

O RGAN-SPECIFIC, targeted field-of-view (FoV) positron emission tomography (PET)/magnetic resonance imaging (MRI) inserts are viable solutions for a number of imaging tasks where whole-body PET/MRI systems lack the necessary sensitivity and resolution [1]–[4].

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