Flow velocity and angle: case report


The degree of stenosis is correlated with the clinical event: the greater is the stenosis, the greater is the risk of TIA/stroke and the benefit of surgery. So particular care should be used to evaluate the percentage of stenosis.

The Doppler signal and colorDoppler are dependent on the angle of incidence between the Doppler beam and the direction of blood flow.

To measure correctly the flow velocity, the angle of the sample volume must not be aligned with the internal carotid artery (ICA) wall contour, but with the flow vector (the contour of the plaque).

A case of angle of incidence incorrectly aligned with the wall contour of the ICA (and not with the flow vector) resulting in over-estimation of the degree of stenosis, is reported.


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