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Figure 1 Parametric polar map of myocardial perfusion at rest (left), after coronary vasodilation with dipyridamole (middle), and a map of myocardial perfusion reserve (produced by a pixel-by-pixel division of the post-dipyridamole map by the resting map) in a patient with coronary steal (A) and a patient without coronary steal (B). The color scale represents absolute myocardial perfusion (ml/100 g/min) in the flow map, and a relative ratio in the map of myocardial perfusion reserve. Blood flow in the patient with steal decreases in absolute terms after dipyridamole, and myocardial perfusion reserve becomes <1. Polar maps represent myocardial perfusion with anterior to the top, lateral to the reader’s right, inferior myocardium to the bottom, and septal myocardium to the reader’s left. The apex is depicted in the center and the base at the periphery.
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