Real-time shimming using FID navigators
Tess E Wallace1,2, Tobias Kober3,4,5, Jason P Stockmann1,6, Jonathan R Polimeni1,6, Simon K Warfield1,2, and Onur Afacan1,2
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
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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