The Effect of Magnet Flanges on Eddy Current Predictions

Dominic Michael Graziani¹, Jean-Baptiste Mathieu¹, Seung-Kyun Lee¹

Eddy currents from an actively shielded transverse gradient coil were evaluated for the case where the eddy current surfaces are approximated by a coaxial cylinder, as well as a cylinder with flanges. The percent error in the predicted eddy current response in the imaging volume due to neglecting the magnet flanges was determined to be non-negligible, with an observed rms error of 6.9% and 15.8% with and without pre-emphasis respectively. These results have implications when designing gradient coils with an optimal eddy current response.