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Fig. 6 | Fluids and Barriers of the CNS

Fig. 6

From: Upright versus supine MRI: effects of body position on craniocervical CSF flow

Fig. 6

Summary of CSF hydrodynamic changes following shift from upright to supine body position. CSF peak velocities (arrow) and CSF volume displaced (bar) are distinguished in diastole and systole to highlight their caudo-cranial (blue) and cranio-caudal (red) directionality. Together with CSF phase duration (purple bar), all measurements are here represented in proportion to their absolute values. Percentage changes are reported with respect to upright measurements. Note that during diastole CSF peak velocity in supine is ~ 84% greater than what was measured in upright position whilst the diastolic duration is unchanged. However, during systole, the CSF peak velocity does not significantly change between positions whilst a ~ 36% increase is observed in supine systolic duration compared to upright. These differences lead to a greater CSF volume being displaced in supine compared to upright both cranially during diastole (+ 63%) and caudally during systole (+ 47%)

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