Carotid Doppler

Plaque Characterization

Grayscale plaque characterization:

Refer to plaque as:

Society of Radiologists in Ultrasound (SRU) Consensus

This consensus developed recommendations for the diagnosis and stratification of ICA stenosis.
[PSV = peak systolic velocity; EDV = end diastolic velocity; ICA = internal carotid artery; CCA = common carotid artery]


<50% ICA stenosis

50-69% ICA stenosis:

≥70% ICA stenosis but less than near occlusion:

Near occlusion of the ICA:

Total occlusion of the ICA:

Sonographic NASCET Index

This study proposed the incorporation of distal ICA flow velocity information on the conventional carotid Doppler study improving the diagnostic accuracy of PSV 1.

<15% stenosis:

16-49% stenosis:

50-69% stenosis:

70-79% stenosis:

80-99% stenosis:

Complete occlusion: