Fig. 5

Sector-wise Stress and Rest Myocardial Blood Flow in Remote Myocardium, Dark Rim Artifacts, Intermediate-CAD, and Severe-CAD. In the subgroup of NonCAD patients with dark rim artifacts, no significant difference was found between the inner sector MBF for dark rim artifacts region compared to remote myocardium. In patients with CAD, stress MBF in both layers of the myocardium was lower than the corresponding remote region for both intermediate CAD (50–69% QCA stenosis) and severe CAD (QCA stenosis ≥ 70%)