Figure 1

Left: Blood flow profiles from a healthy human volunteer taken at supra-renal and infra-renal axial locations. Note the triphasic flow pattern due to the reversal of flow in the infra-renal aorta. Center: A coronal scout image at the level of the kidneys indicating positions of supra-renal and infra-renal blood flow and velocity measurements. Right: Measured flow waveforms in the supra-renal and infra-renal aorta of 18 mice. Note the lack of triphasic flow in the infra-renal segment.