Fig. 4
From: The value of CSF flow studies in the management of CSF disorders in children: a pictorial review
Phase-contrast sequence in sagittal plane of a 2-year-old girl. a Re-phased image in which there is visible background. b Magnitude image in which the flow is bright with suppressed background. c, d Phase image demonstrates the to-and-fro (pulsatile) bright and black flow of CSF throughout the cardiac cycle. Note the CSF flow in the prepontine-premedullary cisterns (long arrows) and the aqueduct of Sylvius (short arrows)