Abstract #0685

PC-MRI with Phase Recovery from Multiple Wrapped Measurements (PRoM)

Shen Zhao¹, Lee C Potter¹, Ning Jin², Yingmin Liu³, Orlando P Simonetti⁴, and Rizwan Ahmad⁵

¹Electrical and Computer Engineering, The Ohio State University, Columbus, OH, United States, ²Cardiac MR R&D, Siemens Medical Solutions USA, Inc., Columbus, OH, United States, ³Richard M. Ross Heart Hospital, The Ohio State University, Columbus, OH, United States, ⁴Internal Medicine, The Ohio State University, Columbus, OH, United States, ⁵Biomedical Engineering, The Ohio State University, Columbus, OH, United States

In traditional phase-contrast MRI (PC-MRI), the strength of velocity encoding gradient (VENC) offers a tradeoff between the velocity-to-noise ratio (VNR) and the extent of phase wrapping. In contrast, dual-VENC (DV) acquisition achieves the VNR associated with lower of the two VENCs, with higher VENC measurement solely used to perform phase unwrapping¹. Here, we demonstrate that the phase unwrapping can be more effective from two low-VENC measurements, where both VENC values are below the peak velocity. The proposed method, called Phase Recovery from Multiple wrapped measurements (PRoM), enables computationally simple yet near-optimal estimation of unwrapped phase (velocity) from multiple wrapped measurements.

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