Abstract #2355

Distortion correction in multi-echo MRI without field mapping or reverse encoding

Yael Balbastre^1,2, Divya Varadarajan^1,2, Klara Bas³, John Ashburner³, Robert Frost^1,2, and Bruce Fischl^1,2,4

¹Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States, ²Department of Radiology, Harvard Medical School, Boston, MA, United States, ³Wellcome Center for Human NeuroImaging, Queen Square Institute of Neurology, University College London, London, United Kingdom, ⁴Computer Science and Artificial Intelligence Laboratory, Massachusetts Institute of Technology, Cambridge, MA, United States

Synopsis

Low-bandwidth multi-echo acquisitions suffer from spatial distortions between odd and even echoes caused by B₀ homogeneity, causing blurs and loss of effective resolution in sum-of-square images or derived quantitative parameters. We show in this abstract that this curse can also be beneficial, as it allows distortions to be mapped without the need for additional field mapping data. We do so by jointly optimizing a forward model of the data with respect to exponential decay parameters and a smooth distortion map.

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