TABLE 1

CNRs for Weak-Source Phantom Images

940-Bq source220-Bq source55-Bq source
LLD (keV)LLD (keV)LLD (keV)
ReconstructionSmoothed250350400250350400250350400
2D-FBPNo3.443.105.631.291.952.990.200.781.06
2D-FBPYes4.313.786.644.323.505.341.032.934.09
2D-OSEMNo4.212.533.854.271.662.021.271.021.16
2D-OSEMYes3.043.626.431.623.204.740.362.924.44