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Abstract #0379

Three Vencs for the Price of Two: Efficient Multi-Venc Phase-Contrast MRI for Improved Velocity Dynamic Range

Liliana Ma1,2, Kelvin Chow1,3, Can Wu4, Alireza Vali1, Michael Markl1,2, and Susanne Schnell1

1Department of Radiology, Northwestern University, Chicago, IL, United States, 2Department of Biomedical Engineering, Northwestern University, Evanston, IL, United States, 3Cardiovascular MR R&D, Siemens Medical Solutions USA, Inc., Chicago, IL, United States, 4Philips Healthcare, Gainesville, FL, United States

Single-venc 4D flow MRI is inherently limited by the need to set a velocity encoding sensitivity (venc), where velocity(v)>venc results in velocity aliasing and v<<venc results in elevated noise. Thus, we propose a novel multi-venc encoding scheme for reconstruction of a triple-venc 4D flow dataset from our previously described 7TR dual-venc sequence. This triple-venc dataset can be used to improve velocity unwrapping without increasing scan time. The aim of this study was to systematically evaluate the utility of 7TR triple-venc velocity encoding to improve velocity dynamic range and further decrease velocity noise beyond the capabilities of current dual-venc methods.

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