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Figure 3 Same patient as in Figure 2. Top, Perfusion PET study by N-13 ammonia (NH3), left ventricle, long- and short-axis views; N-13 ammonia uptake is present and is homogeneous in the entire myocardial wall, with only a slight reduction in the apex. Bottom, Metabolism PET study by F-18 FDG. F-18 FDG uptake is reduced but is still present in the apex and septum, showing residual viability.