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Simulated single-photon event rates and true (unscattered) coincidence event rates in the 20 cm diameter phantom as a function of axial slice. Coincidence data were binned using single-slice rebinning; maximum accepted ring difference was 5 for 2D, and 23 for 2.5D, 2.7D and 3D. (a) Singles. (b) Trues.
