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Fig. 2B. —Normal duplex MR study of carotid arteries in 36-year-old healthy male volunteer. MR image shows measurement of right-sided internal carotid artery, for which vessel is shifted by input device under region of interest as marked by four white circles in center of image. Time—velocity plot shows less acute downstroke and persistent end-diastolic flow. Peak systolic velocity is slightly lower, with 4.1 cm (vertical line) representing 51.25 cm/sec.