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Abstract #1872

Analysis of Renal Artery Motion During Free Breathing

Ashley Gould Anderson III1, Kevin M. Johnson1, Oliver Wieben1,2

1Medical Physics, University of Wisconsin, Madison, WI, USA; 2Radiology, University of Wisconsin, Madison, WI, USA

Motion of the proximal and distal left and right renal arteries of five volunteers was characterized for the complete respiratory cycle during free breathing. The resulting data provided useful information for respiratory gated acquisitions in renal MRA that use motion measures such as a navigator or bellow reading. With a 40% data acceptance threshold, motion in the renal arteries was limited to 3 mm or less in all subjects. This threshold is the sweet spot for limiting renal artery motion to displacements encountered from cardiac pulsatility while keeping the penalties in scan time reasonable.