Abstract #0658

Measurement and correction of spatiotemporal B0 fluctuations using an FID-navigated EPI sequence

Tess E. Wallace^1,2, Jonathan R. Polimeni^2,3, Jason P. Stockmann^2,3, W. Scott Hoge^2,4, Tobias Kober^5,6,7, Simon K. Warfield^1,2, and Onur Afacan^1,2

¹Computational Radiology Laboratory, Boston Children's Hospital, Boston, MA, United States, ²Department of Radiology, Harvard Medical School, Boston, MA, United States, ³Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Boston, MA, United States, ⁴Brigham and Women's Hospital, Boston, MA, United States, ⁵Advanced Clinical Imaging Technology, Siemens Healthcare, Lausanne, Switzerland, ⁶Radiology, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland, ⁷LTS5, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland

Spatiotemporal B₀ field fluctuations give rise to dynamic susceptibility-induced distortions in EPI time-series, which reduces signal stability, particularly at higher field strengths. In this work, we propose a novel method for rapid measurement of B₀ field changes from FIDnavs embedded in an EPI sequence. We demonstrate the ability of the proposed method to accurately characterize field changes up to second order in controlled phantom and volunteer experiments. Dynamic slice-wise distortion correction using FIDnav field estimates reduced normalized root-mean-square error and improved temporal SNR in volunteers performing deliberate arm motion.

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