Spatial Resolution Improvement for Point Light Source Detection in Scintillator Cube using SPAD Array with Multi Pinholes

Abstract

This paper introduces a method to improve the spatial resolution of the point light source detection in scintillator by offering a scintillation detector with a new structure. By introducing a lightproof material with multiple pinholes between the scintillator cube and photon sensors, the light source can be detected through photon reverse ray tracing method. The proposed scintillation detector can provide fine spatial resolution about 10 μm∼20 μm, which is more than 10× finer than the prior arts. To optimize the design, the impact of the design parameters on the detection resolution is discussed based on the detailed simulation results. The experimental result shows that with the optimized parameter choice we can further improve the spatial resolution to 5 μm∼10 μm.