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Table 1: 
Color duplex ultrasonography criteria for identification of 70% to 99% internal carotid artery stensosis
ParametersCriteria
PSV≥230 cm/s
EDV≥75 cm/s
PSVICA/CCA≥3.6
  • Note.—PSV indicates peak systolic velocity; EDV, end diastolic velocity; PSVICA/CCA, ratio of internal carotid artery to common carotid artery peak systolic velocity.