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Abstract #4212

Mapping B0 inhomogeneities through a self-contained analysis of single-shot 2D MRI data

Gilad Liberman1, Samuel F Cousin1, and Lucio Frydman1

1Chemical Physics, Weizmann Institute of Science, Rehovot, Israel

Ultrafast MRI is susceptible to main field distortions ΔB0 that affect these images’ quality and faithfulness –particularly along the low-bandwidth dimension. This work shows that these distortions can be mapped from the spatial images themselves, without requiring additional information. This information becomes available from a time-frequency analysis of the signals, after freeing them from phase-wrapping complications. This hypothesis is explained, and results are demonstrated using both simulations and single-shot human brain images collected by spatiotemporal encoding (SPEN) techniques. The method opens a route to enhancing SPEN’s and EPI’s robustness to field inhomogeneities.

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