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Figure 6 (A) Regional myocardial signal density divided by the left ventricular blood pool signal density (y-axis) versus microsphere-derived myocardial blood flow (x-axis) in both the stenosed left anterior descending artery territory and remote myocardial territory using a semiautomated volumetric analysis over the range of flows studied (y = –0.00168x² + 0.04701x + 0.07604, LR chi-square (2 df) = 31.8, p < 0.0001). (B) Data representing flows less than 8 ml/g/min from (A) are shown in (B) (y = 0.03453x + 0.09437, LR chi-square [1 degree of freedom] = 17.0, SE = 0.007, p < 0.0001) (n = 7). SD ratio = myocardial signal density/left ventricular blood pool signal density.