Capping off the actively shielded cylindrical gradient story
Brown R, Petropoulos L, Eagan T, Edelstein W, Baig T
Case Western Reerve University
Eddy currents produced by the residual field from actively shielded gradients cause the inner bore of the cryostat to vibrate. These vibrations produce acoustic noise and the eddy currents affect image acquisition and processing. We propose a new design for an actively shielded, cylindrical transverse gradient coil with endcaps. The active windings of the shielding coil are extended over the ends of the gradient coil form and inward to its inner radius. The design was accomplishied using a target-field-like approach. The peak fringe field reduction with this approach is observed to be approximately 70%.