The implications of different criteria for grading carotid artery stenosis by duplex ultrasound

Purpose Duplex ultrasound is the first‐line mode of investigation for carotid stenosis, whose severity could be graded according to NASCET or St. Mary's ratio criteria. The aim of this study was to compare these two methods and review the literature. Methods All patients who had carotid duplex ultrasound in a 1‐month period were included. The reports and images were retrospectively reviewed, and the grade of carotid artery stenosis was then...