FIGURE 7. Patient studies: semiquantitative analysis of polar maps from 4D-MSPECT. (A) Mean differences between studies without (IRNC) and with AC (IRAC). (B) Mean differences between studies without (IRNC) and with AC after correction for misalignment (IRAC-MC). (C) Mean differences between attenuation-corrected studies before (IRAC) and after correction for misalignment (IRAC-MC). NS = not significant.