Abstract #3667

Accelerated $$$B_{0}$$$ Mapping Using "X" Sampling in $$$k$$$-TE Space

Xin Miao¹, Yi Guo², Krishna S. Nayak^1,2, and John C. Wood^1,3

¹Biomedical Engineering, University of Southern California, Los Angeles, CA, United States, ²Ming Hsieh Department of Electrical Engineering, University of Southern California, Los Angeles, CA, United States, ³Division of Cardiology, Children's Hospital Los Angeles, Los Angeles, CA, United States

High-resolution B₀ mapping suffers from long scan time, and issues with phase-wraps. We present an acquisition and reconstruction technique that resolves both problems. We utilize “X” sampling in k-TE space, in which multiple phase-encoding lines are acquired exactly twice per TR. The echo spacing is shortest for central k-space and largest for outer k-space. A multi-scale reconstruction enables pixel-wise phase unwrapping. This technique may be particularly useful for quantitative susceptibility mapping (QSM), as it could a) shorten scan time while maintaining the sensitivity to high-order field variation and b) simplify phase-unwrapping, which are the key features of interest in QSM.

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