Figure 1.

Example of blood flow velocity data (left) and high spatial resolution angiogram (right) derived from 4D flow MRI images. Pulse wave velocity (PWV) was estimated from time-resolved cardiac waveforms located at the cervical aspect of the internal carotid arteries (ICAs) (left, blue block) and petrous aspect of the ICA (left, orange block). The temporal shifts were derived from differences in the time to upstroke and the spatial distance from centerline coordinates along the vessel length.