Color-coded end-systolic basline image (A); adenosine induced stress image (B); adenosine induced stress image with moderate LcX stenosis (C); and with severe stenosis (D). Only hypointense regions of the myocardium were color coded. Yellow hues correspond to values close to m-s as described in text, while red is for darker values. The small and minimally contiguous regions of hypointensity (yellow coded) in th BA and AD images may be attributed to signal inhomogeneties due to physiological nose, coil bias, or limitations in shimming. However, regions of hypointensity are significantly larger under stenosis (C and D). The premise of usin baseline images is to isolate the BOLD signal from background deviations. The CM values for the imges A to D are 0.05, 0.02, 0.13, and 0.14, respectively.Total microsphere flow for each case is 19.82, 53.41, 34.67, and 30.44, resppectively.