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Abstract #3732

Accelerated Multi-Echo Gradient Echo Imaging using Locally-Low Rank Regularization

Mirco Grosser1,2 and Tobias Knopp1,2
1Section for Biomedical Imaging, University Medical Center Hamburg-Eppendorf, Hamburg, Germany, 2Institute for Biomedical Imaging, Technical University Hamburg, Hamburg, Germany

Reconstruction methods for multi-contrast MRI often employ a low-rank constraint to reconstruct images from highly undersampled data. For multi-echo gradient echo sequences such a constraint is hard to impose due off-resonance-induced oscillations of the time signals. In this work we show that spatio-temporal correlations can be exploited efficiently using locally low rank regularization. Based on this observation we develop a locally-low rank regularized reconstruction scheme and test it on a multi-echo gradient echo dataset of a human brain. In our tests the proposed method shows significantly improved image quality compared to regular compressed sensing reconstructions.

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