Abstract #4428

A fast approach for simultaneous measurement of head motion and induced magnetic field changes using FID navigators

Tess E Wallace^1,2, Onur Afacan^1,2, Tobias Kober^3,4,5, and Simon K Warfield^1,2

¹Computational Radiology Laboratory, Boston Children's Hospital, Boston, MA, United States, ²Harvard Medical School, Boston, MA, United States, ³Advanced Clinical Imaging Technology, Siemens Healthineers, Lausanne, Switzerland, ⁴Department of Radiology, University Hospital (CHUV), Lausanne, Switzerland, ⁵LTS5, Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland

Incorrect spatial encoding due to subject motion is a dominant source of artifacts in MRI. Even if changes in head pose are measured and corrected, motion-induced perturbations in the local magnetic field are a further source of image degradation, particularly for imaging at longer echo times and higher field strengths. We propose a fast approach for simultaneously measuring head motion and spatiotemporal B₀ changes using FID navigators (FIDnavs) and simulation of the acquisition physics. Rigid-body motion and first-order field coefficients estimated from FIDnavs exhibit a high degree of agreement with ground-truth values in both phantom and volunteer experiments.

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