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Fig. 3 | Fluids and Barriers of the CNS

Fig. 3

From: Extracranial versus intracranial hydro-hemodynamics during aging: a PC-MRI pilot cross-sectional study

Fig. 3

Examples of flow over one cardiac cycle in all the vessels which composed the total arterial and venous cerebral blood flows of one young volunteer. a measured extracranial arterial flow (internal carotid + vertebral), b measured intracranial arterial flow (internal carotid and basilar), c measured intracranial venous flow (straight and sagittal sinuses), d measured extracranial venous flow (internal jugular). Pulsatility was calculated from PC-MRI data obtained along the cardiac cycle, both at intracranial and extracranial levels. Theoretical venous cerebral blood flows represent the measured venous flows and were corrected by an alpha factor to account for the peripheral cerebral veins, which were not measured. For these 4 flows, a pulsatility index, PI = (max–min)/mean, was calculated

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