FIGURE 4. S/N percentage improvement (%I) images. First row compares FBP-AC S/N images (Fig. 3, row 1) with OSEM-AC S/N images (Fig. 3, row 2). Second row compares FBP-NAC S/N images (Fig. 3, row 3) with OSEM-NAC S/N images (Fig. 3, row 4). Light blue background indicates that FBP and OSEM had comparable S/N. Red-to-yellow areas are where OSEM was better than FBP. Dark blue–to–black areas are where FBP was better than OSEM.

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