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Abstract #3932

Characterization of Eddy-Currents Associated with Multi-Coil B0 Field Control in an Accessible Head-Only Scanner

Sebastian Theilenberg1, Rashad Ismail1, Taylor Froelich2, Lance DeLabarre2, Terence W Nixon3, Robin A de Graaf3, Michael Garwood4, and Christoph Juchem1,5
1Department of Biomedical Engineering, Columbia University in the City of New York, New York, NY, United States, 2Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, MN, United States, 3Department of Radiology and Biomedical Imaging, Magnetic Resonance Research Center, Yale University School of Medicine, New Haven, CT, United States, 4Center for Magnetic Resonance Research, Department of Radiology, University of Minnesota, Minneapolis, MN, United States, 5Department of Radiology, Columbia University Medical Center, New York, NY, United States

Synopsis

Keywords: System Imperfections, Gradients, Eddy-Currents, Multi-Coil

Motivation: The eddy current (EC) behavior of a multi-coil array for image encoding in a novel head-only MR scanner has been estimated theoretically, however, to date, the physical measurements have been outstanding.

Goal(s): Our goal was the spatiotemporal characterization of the ECs of this system.

Approach: We measured the ECs via local field probes by acquiring FIDs at a series of delays after the switching of individual MC channels.

Results: Measurements at over 40 positions in the FOV enabled a comprehensive analysis of the ECs. The longest EC components last for more than a second, however, we show that EC compensation is possible.

Impact: The presented eddy-current characterization is an important stepping stone towards eddy-current compensation for DYNAMITE image encoding in non-traditional MR scanner designs.

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Abstract

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