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Figure 3 Polar map display of relative myocardial uptake of ¹⁸fluorodeoxyglucose (¹⁸FDG) and ¹³N-labeled ammonia (¹³NH₃). The most basal LV wall segments are depicted in the most peripheral rings, whereas the most apical occupies the center of the map. S = septum; I = inferior; L = lateral; A = anterior. Segments with brighter colors (white, red) present higher uptake values. There is a large ¹³NH₃ uptake defect in left anterior descending artery territory corresponding to 20% of the left ventricular. In the same area, increased uptake of ¹⁸FDG is observed.