Fig. 3

Effects of increasing the number of iterations of reconstruction (with 10 subsets). Effects on a short-time (5 min) acquisitions and b longtime (32 min) acquisitions. The filled and unfilled squares indicate the maximum and mean radioactivity concentrations of SwiftScan SPECT, respectively. The filled and unfilled circles indicate the maximum and mean radioactivity concentrations of step and shoot mode (SSM), respectively. The dashed line indicates the actual concentration of radioactivity