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Figure 5 Perfusion deficit myocardial signal density (SD) divided by the left ventricular (LV) blood pool signal density (y-axis) versus microsphere-derived myocardial blood flow (x-axis) in the stenosed left anterior descending artery territory determined by a semiautomated approach that defines the perfusion deficit as one standard deviation below the mean SD of the remote myocardial territory. (y = 0.07037x – 0.00681, Pearson R = 0.98, p < 0.001; LR chi-square [1 degree of freedom] = 19.21, SE = 0.007, p < 0.0001) (n = 6).