Ultrasound vector flow imaging of laminar flow in the CB. In the upper part, a single image, corresponding to the systolic peak, was extracted from the 900 images of the cine loop acquired in 1.5 seconds. The system measures the speed and direction of all blood cells flowing through every point of the selected region of interest. The flow is represented by several color arrows. The color and size of the arrows allow visual quantification of flow velocity in the 2D space. The arrows are randomly distributed and flow according to their velocities. At a static image (a single frame), different concentrations of the arrows in the lumen could be seen. In the lower part, the flow velocity‐versus‐time curves were measured in 3 locations of the CB: internal carotid artery (ICA) curve (A) displayed in light blue, external carotid artery (ECA) curve (B) in red, and common carotid artery (CCA) curve (C) in yellow: the time interval (T1–T2) corresponding to the cardiac cycle duration (arrowheads) can be selected manually on the acquired row data video clip, thus allowing a correct subsequent WSS measurement. In the updated version, the HR and HR′ (as shown in the image) allow the selection of the corresponding cardiac cycle duration automatically or manually.