On a longitudional scout image of the aortic arch (1A), a single one-directional through-plane velocity-encoded MRI acquisition was planned perpendicular to the ascending and proximal descending aorta. Figure 1B represents the resulting flow velocity wave forms assessed at the two respective sites, illustrating the pulse wave propagation between sites. Figure 1C shows a coronal maximum intensity projection of 3D time-of-flight data of the carotid arteries, from the origin at the aortic arch to the circle of Willis. Two one-directional velocity-encoded MRI acquisitions were planned (yellow lines: one proximally at the left common carotid artery just above the aortic arch and one distally just below the petrous portion of the left internal carotid artery). Figure 1D represents the resulting velocity wave forms assessed at the two respective sites, illustrating the pulse wave propagation.