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Figure 3 Color-coded images and corresponding time–intensity plots (fitted to a gamma-variate function) in a Group II dog receiving a bolus injection of contrast during hyperemia. At baseline (A), there is no difference in VI between the LAD and LCx beds. In the presence of a mild stenosis (pressure gradient 13 mm Hg), VI in the LAD bed is less than that in the LCx bed (B). Arrows indicate the region in the LCx bed from which the time–intensity curves were derived; other symbols as in Figure 1.
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