Abstract #0236

Real-time shimming using FID navigators

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

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

Synopsis

Real-time B₀ shimming enables improved compensation for the effects of dynamic field perturbations in MRI compared to retrospective approaches, which are computationally intensive and cannot compensate for inherent losses of information. FID navigators can rapidly characterize spatiotemporal field changes using a forward model that predicts the effect of B₀ shim changes on the measured FID signal, making them ideally suited for real-time applications. In this work, we implement real-time field control using FID navigators to compensate for spatially linear field changes and demonstrate substantially improved T₂*-weighted image quality in the presence of field perturbations in three volunteers scanned at 3T.

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