Fig. 2From: Non-invasive assessment of vascular alteration using ultrasoundVVI analysis: circumferential strain and strain rate of six segments in a 22-year-old male subject (a) and a 65-year-old male subject (b). The carotid artery of the older subject showed a more reduced and asynchronous arterial expansion during systole. VVI = velocity vector imaging (adapted from Ref 29)Back to article page