Fig. 10From: Measurements of cerebrospinal fluid production: a review of the limitations and advantages of current methodologiesScheme of the human brain CSF system. The velocity of the CSF per unit time within the aqueduct is measured by the phase-contrast magnetic resonance imaging (PC–MRI) method. Inset is the aqueduct of Sylvius, which is considering to be a cylinder through which the CSF passes. The CSF production rate is calculated using an equation based on CSF velocity using the MRI methodBack to article page