Abstract #2595

Accelerated Phase-Contrast MRI using Hybrid One- and Two-sided Flow-Encodings Only (HOTFEO)

Da Wang^1,2, Jiaxin Shao¹, Daniel B Ennis^1,2, and Peng Hu^1,2

¹Radiology, University of California, Los Angeles, Los Angeles, CA, United States, ²Biomedical Physics, University of California, Los Angeles, Los Angeles, CA, United States

In conventional 4D-flow phase-contrast MRI, each cardiac phase acquires the flow-compensated and three-directional flow-encoded echoes, which often limits the achievable temporal-resolution and temporal-footprint. This can result in under-estimation of maximum peak velocity. Herein, we propose a fast 4D-flow strategy that eliminates the flow-compensated acquisition using hybrid one- and two-sided flow encoding only (HOTFEO). The flow-compensated background phase is derived from three-directional flow-encoded data based on a velocity direction constraint that assumes the velocity direction, not the magnitude, changes very little between two cardiac phases. HOTFEO provides accurate blood flow and velocity measurements compared with conventional 4D-flow technique.

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