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Ultrasound images of carotid artery stenosis and plaque. (A) Atherosclerotic carotid stenosis: diameter reduction 73%, peak systolic velocity of internal carotid artery 168 cm/s, PSV ratio 2.9 (168 cm/s ÷ 57 cm/s). (B) Carotid plaque: diameter reduction 36%, peak systolic velocity of internal carotid artery 110 cm/s, PSV ratio 1.3 (110 cm/s ÷ 81 cm/s).
