2nd October 2019

radiopaedia
15

What is a normal internal carotid artery velocity?

[PSV = peak systolic velocity; EDV = end diastolic velocity; ICA = internal carotid artery; CCA = common carotid artery]
normal.
ICA PSV is <125 cm/sec and no plaque or intimal thickening is visible sonographically.
additional criteria include ICA/CCA PSV ratio <2.0 and ICA EDV <40 cm/sec.

Moreover, what is the normal ICA CCA ratio?

Table 1. Society of Radiologists in Ultrasound Consensus Criteria for Carotid Stenosis 23
Primary parametersSecondary parameters
Degree of stenosis, %ICA PSV, cm/secICA/CCA PSV ratio
Normal<125<2.0
<50<125<2.0
50-69125-2302.0-4.0

What does a carotid Doppler show?

A Doppler ultrasound study – a technique that evaluates blood flow through a blood vessel – is usually part of this exam. It's most frequently used to screen patients for blockage or narrowing of the carotid arteries, a condition called stenosis which may increase the risk of stroke.
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