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Figure 3 Stacked color histograms of regional fractional area change obtained from images in Figure 2. Each layer of these histograms represents incremental fractional area change that occurred during a 33-ms period of time, with earliest motion being shown on the bottom and latest motion at the top of the histograms. The dashed band in the background of the resting histograms is the normal range of regional fractional area change, which is shown for comparison with the individual patient’s data.