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(a) Light leak (dashed arrows) due to the finite gap between crystal and SiPM, which is the summation of the thickness of the coupling glue and protective resin, and due to the crystal column extending beyond the pixel’s active area. (b) Light leak is minimized by the tapered design. (c) Zoom-in schematic and (d) fabricated cross-sectional views of a 4-to-1 coupled Prism-PET detector module that crystals start tapering at 5 mm from the crystal-readout interface.
