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Abstract #0293

Frequency Encoding in the Presence of Extreme Static Field Gradients

Kevin M. Koch1, Kevin F. King1, Weitian Chen2, Garry E. Gold3, Brian A. Hargreaves3

1Global Applied Science Laboratory, GE Healthcare, Waukesha, WI, USA; 2Global Applied Science Laboratory, GE Healthcare, Menlo Park, CA, USA; 3Department of Radiology, Stanford University, Stanford, CA, USA

MR capabilities when imaging in the direct vicinity of metallic devices have been substantially improved with the development of 3D-MSI methods. The MAVRIC, SEMAC, and VS-MSI techniques have shown promising clinical capabilities in diagnosing soft-tissue pathology in previously inaccessible regions. Here, we discuss some limitations on how close 3D-MSI, or any technique relying on frequency-encoding, can image near metal in the presence of substantial local induction gradients. The presented analysis and results can aid in explaining residual artifacts in 3D-MSI and in predicting the effective spectral coverage required by the techniques.