Abstract #4400

A Review and Comparison of Unwrapping Methods in Dual Velocity-Encoding MRI

Pamela Franco^1,2,3, Liliana Ma^4,5, Susanne Schnell⁶, Michael Markl^4,5, Cristobal Bertoglio⁷, and Sergio Uribe^1,2,8

¹Biomedical Imaging Center, School of Engineering, Pontificia Universidad Católica de Chile, Santiago, Chile, ²Millennium Nucleus for Cardiovascular Magnetic Resonance, Santiago, Chile, ³Electrical Engineering Department, School of Engineering, Pontificia Universidad Católica de Chile, Santiago, Chile, ⁴Department of Biomedical Engineering, McCormick School of Engineering, Northwestern University, Chicago, IL, United States, ⁵Department of Radiology, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States, ⁶Institut für Physik, Universität Greifswald, Greifswald, Germany, ⁷Bernoulli Institute, University of Groningen, Groningen, Netherlands, ⁸Radiology Department, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile

Synopsis

4D flow MRI data may be inaccurate due to phase wrapping when using lower VENC than the maximum actual velocity. Accuracy can also be affected by reduced velocity-to-noise ratio (VNR) when using a too high VENC. Dual-VENC approaches have been proposed to unwrap velocity-aliasing artifacts and increase VNR, providing more reliable measurements and allowing more flexibility in the selection of VENC. Dual-VENC methods enable acquisitions of 4D flow MRI data with high dynamic range and without velocity aliasing. The purpose of this study is to compare the performance of some of these methods.

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