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Figure 5 Stacked color histograms of regional fractional area change obtained from images in Figure 4. The normal range of regional fractional area change shown as a dashed band in the background of the resting histograms allowed objective identification of the regional wall motion abnormalities noted in this patient at rest (top, open arrows). The resting histograms, scaled down to 60% and shown as dotted areas in the background of histograms obtained with dobutamine, allow objective detection of stress-induced wall motion abnormalities (bottom, solid arrows) in the perfusion territory of the left anterior descending coronary artery.
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