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Percentage of single photon events interacting with a dual-LSO-PSAPD module at the panel corner and center (see Fig. 4) with the interaction energies summing to a 24% window about 511 keV acquired as a function of minimum energy per interaction needed to trigger an acquisition. Data plotted as a fraction of (a) all single photons that interacted at least once with the LSO detector volume and (b) events with sum of energy depositions falling within the 511 keV photopeak.
