The NPH group could be further divided into hyper- and hypodynamic groups when compared with the normal age- matched subjects. Vmax of the control group was significantly higher than that of the hypodynamic-NPH group (1.92 ± 1.11 cm/s, p < 0.001) and lower than that of the CH group (p < 0.007) and of the hyperdynamic- NPH group (10.52 ± 0.23 cm/s, p < 0.001). With optimized parametric setting, two-dimensional cine phase-contrast MR imaging appears to be practical for routine evaluation of patients with abnormal CSF flow dynamics. The peak velocity of the CSF flow was significantly higher in the hyperdynamic-NPH group but lower in the hypodynamic-NPH group as compared with the control group. Our results confirm that, in NPH patients, a pre-surgical MR imaging evaluation of CSF potentially can be very helpful in distinguishing the low-CSF- dynamic from high-CSF-dynamic groups before any CSF diversion procedure is contemplated.