Doppler Velocity Estimates of Internal Carotid Artery Stenosis: Angle Correction Parallel to the Color Doppler Lumen Versus Parallel to the Artery Wall.

Objectives: We compared internal carotid artery Doppler peak systolic velocities (PSVs) measured with angle correction parallel to the artery wall (// wall) on grayscale images and parallel to the direction of blood flow (// flow) on color Doppler images.

Methods: We studied 25 internal carotid lesions with PSVs higher than 125 cm/s. The PSVs were measured in the same imaging plane, at the stenosis orifice (0 cm) and at 0.