FIGURE 2. Same PET image as in Figure 1B, corrected for PVE according to M-PVEc (A), MG-PVEc (B), and mMG-PVEc (C) under optimal conditions. Color scale ranges from 0% to 150% GMR. A substantial residual underestimation of GM values remained after M-PVEc and was still present at the GM/WM interface when using MG-PVEc, because of the overestimation of WM, and was further decreased when using mMG-PVEc, as can be noted by the reduction of red pixels (GMR, 50%–75%) at the inner GM in C.