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. 2011 Jun 21;8(3):340–348. doi: 10.1007/s13311-011-0042-4

Table 3.

The Society of Radiologists in Ultrasound consensus criteria for carotid stenosis

Stenosis range N method ICA PSV ICA/CCA PSV ratio ICA EDV Plaque
Normal < 125 cm/s < 2.0 < 40 cm/s None
< 50% < 125 cm/s < 2.0 < 40 cm/s < 50% diameter reduction
50–69% 125–230 cm/s 2.0–4.0 40–100 cm/s > 50% diameter reduction
70-near occlusion > 230 cm/s > 4.0 > 100 cm/s > 50% diameter reduction
Near occlusion May be low or undetectable Variable Variable Significant, detectable lumen
Occlusion Undetectable Not applicable Not applicable Significant, no detectable lumen

EDV = end diastolic velocity; ICA/CCA = internal carotid artery/common carotid artery; PSV = peak systolic velocity