(A) Single views of stress PET relative perfusion images at baseline and follow-up of 2 different patients, illustrating progression and regression of coronary artery stenosis in the single view with a perfusion abnormality, other normal views not shown as redundant. (B) Schematic of stress PET images at baseline compared with follow-up PET in various quadrant pairings. Reproduced, with permission, from Sdringola et al. (35). Abbreviations as in Figures 1 and 3.