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Cardiac- and respiratory-driven CSF velocities are shown at (a) ROIs in the prepontine (#1), aqueduct (#2), fourth ventricle (#3), and lateral ventricle (#4) and indicated on the T2 image inset. Significant differences were observed in the prepontine (P < 0.01) and the aqueduct (P < 0.01). The ratios of the cardiac- and respiratory-driven CSF velocities are shown in (b). There were significant differences in all the ROIs (P < 0.01). CSF, cerebrospinal fluid.
