Fig. 2

Extracranial and intracranial acquisition imaging. Sagittal 3D phase-contrast angiography (a) image was used as a reference to set the different acquisition planes perpendicular to the flow direction in the vessels. Extracranial acquisition (b) was used to quantify vascular flows in right and left internal carotid arteries (ICAs), vertebral arteries (VAs) and both internal jugular veins (IJV). Intracranial acquisition (c) was used to quantify vascular flows in right and left internal carotid arteries (ICAs), basilar artery (BA); sagittal sinus (Sag. S), and straight sinus (Str. S)