Abstract #0638

Correcting motion-related B0 Inhomogeneities via Combined Spherical Harmonics and AC/DC Matrix Coils Using AI-based Prediction

Mohammad Khosravi¹, Beata Bachrata^1,2, Wolfgang Bogner^3,4, Bernhard Strasser³, Jason Stockmann^5,6, Günther Grabner¹, and Stanislav Motyka^3,4

¹Department of Medical Engineering, Carinthia University of Applied Sciences, Klagenfurt, Austria, ²Karl Landsteiner Institute for Clinical Molecular MR in Musculoskeletal Imaging, Vienna, Austria, ³High Field MR Center, Department of Biomedical Imaging and Image-Guided Therapy, Medical University of Vienna, Vienna, Austria, ⁴Christian Doppler Laboratory for MR Imaging Biomarkers (BIOMAK), Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria, ⁵Harvard Medical School, Boston, MA, United States, ⁶A.A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Charlestown, MA, United States

Synopsis

Keywords: Artifacts, Machine Learning/Artificial Intelligence, B0 Inhomogeneities, Dynamic Shimming, AC/DC Matrix Coils

Motivation: High-quality MR imaging requires a homogeneous magnetic field (B0) throughout the whole acquisition; however, it can be impaired by motion-related changes.

Goal(s): i) Evaluate the effectiveness of static and dynamic shimming in the presence of motion, when integrating spherical harmonics (SPH) with AC/DC matrix coils. ii) Correcting motion-related B0 inhomogeneities using AI-based prediction.

Approach: A deep learning network is trained to predict motion-related B0 inhomogeneities and derive correction terms for dynamic shimming.

Results: Dynamic shimming was shown crucial to ensure consistent B0 homogeneity when using AC/DC shim coils. Shimming based on AI-predictions effectively mitigated motion-related B0 inhomogeneities.

Impact: Dynamic shimming with spherical harmonics and AC/DC matrix coils based on AI-prediction of motion-related B0 inhomogeneities is shown feasible. This offers a promising approach for dynamic shimming that could potentially replace volumetric navigators while maintaining motion-related B0 stability.

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