Abstract #3446

4D Flow MRI velocity encoding effects on in vitro aortic dissection false lumen velocity distribution

Sylvana García-Rodríguez¹, Philip Corrado², Jon Wrobel³, Timothy Aaron Ruesink⁴, Alejandro Roldán-Alzate^1,4, and Christopher Jean François¹

¹Department of Radiology, University of Wisconsin - Madison, Madison, WI, United States, ²Department of Medical Physics, University of Wisconsin - Madison, Madison, WI, United States, ³School of Medicine, University of Wisconsin - Madison, Madison, WI, United States, ⁴Department of Mechanical Engineering, University of Wisconsin - Madison, Madison, WI, United States

Selecting the appropriate velocity sensitivity is critical in assessing flow within the false lumen of aortic dissections, where low velocities are dominant. This study compares effects of two VENC settings on velocity distribution within the false lumen of 3D printed aortic dissection models. We observed significant changes in velocity distributions depending on the VENC selected for the 4D Flow MRI acquisition. This difference tends to be accentuated at lower flow rates and would have important implications on calculations of other hemodynamic parameters, including wall shear stress, kinetic energy and vorticity, which may be predictors of outcomes in aortic dissection patients.

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