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Fig. 6 | Fluids and Barriers of the CNS

Fig. 6

From: Uncertainty quantification of parenchymal tracer distribution using random diffusion and convective velocity fields

Fig. 6

Tracer concentrations. a Tracer concentration in the SAS (\(c_{\mathrm{CSF}}\)) used as boundary conditions at the brain surface at the level of the foramen magnum (FM), Sylvian fissure (SF) and the precentral sulcus (PS). At the lower level of the SAS, tracer concentration peaks at around 3 h, while at the upper levels, peak concentration occurs later. Following peak values, the concentration in the SAS decreases as tracer enters the parenchyma. The SAS concentration is modeled by (4). b Tracer concentration over time in three different points at a given distance from the brain surface. The points were chosen along a line directly from the cortex towards the ventricles at the level of the Sylvian fissure

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