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Abstract #0718

Advances in Software Compensation of Eddy Current Fields in Multislice Higher Order Dynamic Shimming.

Saikat Sengupta1,2, Malcolm Avison2,3, John Gore2,3, Edward Brian Welch2,3

1Biomedical Engineering, Vanderbilt University, Nashville, TN, USA; 2Vanderbilt University Institute of Imaging Science, Nashville, USA; 3Radiology & Radiological Sciences, Vanderbilt University, Nashville, USA

We present advances in a prospective software compensation method of higher order shim induced eddy currents in multislice Dynamic Bo Shimming (DS). The method based on steady state generation of eddy fields requires no hardware eddy current compensation, subject specific prescanning or shim shielding. Results of application to 2nd and 3rd order DS in single shot EPI are presented demonstrating correction of distortions, ghosting and signal loss. The model of correction is modified to include static interaction between shims and invariability with time between shim switches is demonstrated.