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figure 3 The intravascular coronary ultrasound (ivus) mid-left anterior descending coronary artery (lad) area before and after ultrasound. on the vertical axis is the mid-lad ivus area; on the horizontal axis is the time (s/min) of ultrasound exposure. vasodilation increased incrementally with the duration of ultrasound. (inset upper left) baseline ivus image; (inset bottom right) ivus image of vasodilation seen after 5 min of ultrasound exposure. the ivus mid-lad areas in mm2 ± standard deviation (sd) are shown below each of the six time intervals at which the areas were measured.
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