Distortion correction in multi-echo MRI without field mapping or reverse encoding
Yael Balbastre1,2, Divya Varadarajan1,2, Klara Bas3, John Ashburner3, Robert Frost1,2, and Bruce Fischl1,2,4
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
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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