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Figure 4 Quantitative coronary angiography (QCA) measurements. The mean percent change of left anterior descending coronary artery (LAD) and left circumflex coronary artery (LCx) diameter at baseline and after ultrasound (USD) exposure are shown. The vertical axis indicates the mean diameter of the coronary artery by QCA analysis; horizontal axis shows the baseline and the eight subsequent times of measurement during and after USD exposure. Percent change in angiographic diameter is plotted, and the average diameter in mm with standard deviation (SD) is shown below each of the nine time intervals. 1: Baseline 1 (before USD exposure). 2: After 5 min of USD exposure. 3: Baseline 2 (after 5 min of USD exposure followed by a 60-min observation [OB] period). 4: After 30 min of USD exposure. 5: After 60 min of USD exposure. 6: After 90 min of USD exposure. 7: After 30 min of OB. 8: After 60 min of OB. 9: After 90 min of OB. The table below the figure indicates the coronary artery diameter for each of the nine time intervals plotted on the graph.
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