Abstract #4542

Aortic hemodynamics with accelerated dual-venc 4D fow MRI in patients with type B aortic dissection

Ozden Kilinc¹, Stanley Chu¹, Justin Baraboo^1,2, Elizabeth K. Weiss^1,2, Anthony Maroun¹, Ning Jin³, Kelvin Chow^1,4, Xiaoming Bi⁴, Rachel Davids⁴, Chris Mehta⁵, S. Chris Malaisrie⁵, Andrew Hoel⁶, Michael Markl^1,2, and Bradley D. Allen¹

¹Department of Radiology, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States, ²Department of Biomedical Engineering, Northwestern University, Chicago, IL, United States, ³Cardiovascular MR R&D, Siemens Medical Solutions USA, Inc., Cleveland, OH, United States, ⁴Cardiovascular MR R&D, Siemens Medical Solutions USA, Inc., Chicago, IL, United States, ⁵Division of Cardiac Surgery, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States, ⁶Division of Vascular Surgery, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States

Synopsis

4D flow MRI is a well-validated imaging technique for quantitative assessment of blood flow hemodynamics and has shown promise in evaluation of type B aortic dissection (TBAD). However, single velocity encoding (venc) 4D flow MRI is limited by its inability to fully capture wide range of velocities related to variable pathologic hemodynamic patterns such as true lumen and false lumen flow range of velocities in TBAD. We hypothesize that dual-venc acquisition improves velocity-to-noise ratio, better captures full dynamic range of velocities in TBAD and provides improved characterization of flow hemodynamics relative to single-venc acquisitions.

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