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Figure 5 A, Correlation between global MBF reserve and ¹¹C-acetate clearance rate ratio (ratio of ¹¹C-acetate clearance rates during dobutamine infusion and clearance rates at rest). Note that low dose dobutamine infusion did not exhaust the dipyridamole-determined MBF reserve. B, Correlation between global ¹¹C-acetate clearance rate (k_mono = oxygen consumption) at rest and percent myocardium showing mismatch.