Fig. 4
From: Upright versus supine MRI: effects of body position on craniocervical CSF flow
Changes in CSF hydrodynamic properties due to body position shift. A CSF volume exchanged at craniocervical level during one cardiac cycle (systole or diastole) in both body positions. Notice the difference in directionality. B CSF peak velocity measured during diastole and systole in supine and upright positions. Notice how significant difference in CSF peak velocity is observed between supine and upright position in diastole (**** = p < 0.0001) but are not significantly different in systole (ns = not significant)