Fig. 4

Mean uncalibrated flow curves (voxel intensity) over the cardiac cycle. Top) aqueduct and bottom) prepontine cistern for the pre-treatment and control groups. The curves are the average of the polynomial fit (6th degree) of the entire group (SD also shown as shaded region). The difference seen between the peak latency (defined as the minimum point of the curve) is significantly shorter (p < 0.01) in the pre-treatment group than in the control group for the prepontine cistern. The objective of this figure is to show the phase change during the cardiac cycle