Fig. 3

An example of the methodology in a large severe inferior transmural scar. A Quality assurance was checked using visual assessment of time activity curves and two automated algorithms. Motion correction was performed as needed. B A ROI was placed around the severe defect on relative images with the resultant size, RU% and average rMBF displayed. This ROI was defined as “ROI-Scar”. C Segmental analysis of the 17-segment polar maps from all SWP. Scar was defined as contiguous segments within the perfusion defect that comprised > 50% of the segment with a segmental summed rest score ≥ 2 and %RU < 65% in all four SWP. These segments are in white font and their average was defined as “Seg-Scar”. Contiguous segments involving the scar but not meeting the noted requirements were averaged and defined as “Seg-Border” (turquoise font). The remaining normal segments (various colors) were averaged and defined as “Seg-Norm”. D Comparisons of rMBF between ROI-Scar and Seg-Scar in various SWP