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

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.