Fig. 4From: Fast GPU-based Monte Carlo code for SPECT/CT reconstructions generates improved 177Lu imagesThe activity recovery (or normalized signal-to-background ratio (SBR)) for the different SPECT reconstructions versus the number of iterations of the 177Lu-filled Jaszczak phantom. a AC-OSEM. b RRC-OSEM. c SARec OSEM. The curves show the SBR versus the number of iterations for the six spheres with diameters 10, 12, 16, 20, 25, and 31 mm, respectively. In panel d, the SBR versus sphere diameter for six iterations are shown for the AC-OSEM (AC), RRC-OSEM (RRC), and SARec OSEM (SARec) reconstructionsBack to article page