Abstract #1341

Non-Cartesian Imaging on a Head-Only System: Impact and Correction of Higher Order Eddy Currents

Steven Kecskemeti¹, Andrew Alexander¹, James Holmes², and Kevin Johnson³

¹University of Wisconsin - Madison, Madison, WI, United States, ²University of Iowa, Iowa City, IA, United States, ³University of Wisconsin - Madison, Madiso, WI, United States

Synopsis

Keywords: System Imperfections, Artifacts, eddy currents

Motivation: Image quality from non-Cartesian methods on a head only scanner were severely degraded with artifacts suggesting uncorrected eddy currents, even though 0^th and 1^st order corrections were used.

Goal(s): The aim is to measure and correct for higher order (2^nd order, including cross term) eddy currents.

Approach: A sequence was developed to measure the eddy currents and an efficient image reconstruction method was develop to account for the non-linear eddy currents.

Results: The presence of second order cross-term eddy currents (xz and yz) was confirmed. Image quality was improved with the new reconstruction algorithm.

Impact: Non-Cartesian imaging can now be performed on the head only MAGNUS MRI scanner without degradation due to non-linear eddy currents.

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