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Dynamic water/fat separation and B0 inhomogeneity mapping-joint estimation using undersampled triple-echo multi-spoke radial FLASH.

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Tan,  Z.
Biomedical NMR Research GmbH, MPI for Biophysical Chemistry, Max Planck Society;

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Voit,  D.
Biomedical NMR Research GmbH, MPI for Biophysical Chemistry, Max Planck Society;

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Kollmeier,  J. M.
Biomedical NMR Research GmbH, MPI for Biophysical Chemistry, Max Planck Society;

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Frahm,  J.
Biomedical NMR Research GmbH, MPI for Biophysical Chemistry, Max Planck Society;

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Citation

Tan, Z., Voit, D., Kollmeier, J. M., Uecker, M., & Frahm, J. (2019). Dynamic water/fat separation and B0 inhomogeneity mapping-joint estimation using undersampled triple-echo multi-spoke radial FLASH. Magnetic Resonance in Medicine, 82(3), 1000-1011. doi:10.1002/mrm.27795.


Cite as: http://hdl.handle.net/21.11116/0000-0003-8AF8-A
Abstract
PURPOSE: To achieve dynamic water/fat separation and B0 field inhomogeneity mapping via model-based reconstructions of undersampled triple-echo multi-spoke radial FLASH acquisitions. METHODS: This work introduces an undersampled triple-echo multi-spoke radial FLASH sequence, which uses (i) complementary radial spokes per echo train for faster spatial encoding, (ii) asymmetric echoes for flexible and nonuniform echo spacing, and (iii) a golden angle increment across frames for optimal k-space coverage. Joint estimation of water, fat, B0 inhomogeneity, and coil sensitivity maps from undersampled triple-echo data poses a nonlinear and non-convex inverse problem which is solved by a model-based reconstruction with suitable regularization. The developed methods are validated using phantom experiments with different degrees of undersampling. Real-time MRI studies of the knee, liver, and heart are conducted without prospective gating or retrospective data sorting at temporal resolutions of 70, 158, and 40 ms, respectively. RESULTS: Up to 18-fold undersampling is achieved in this work. Even in the presence of rapid physiological motion, large B0 field inhomogeneities, and phase wrapping, the model-based reconstruction yields reliably separated water/fat maps in conjunction with spatially smooth inhomogeneity maps. CONCLUSIONS: The combination of a triple-echo acquisition and joint reconstruction technique provides a practical solution to time-resolved and motion robust water/fat separation at high spatial and temporal resolution.