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Illustrations of side readout configurations used to measure the achievable CTR for “sparse” sensor readout. 20 mm length crystals were tested with with four 3×3 mm2 SiPMs in the center of the crystals with (a) and without (b) ESR reflector on the “open” area at the bottom of the crystal. A similar sensor/reflector arrangement was also tested for 10 mm length crystals with two SiPMs ((c) and (d)).
