Design of Flanged RF Shield for Mitigation of RF and Gradient Coil Interactions

Radio-frequency (RF) shields mitigate undesired interactions between gradient coils and RF transmit coils. RF losses in gradient windings can lower the Q of the RF coil and result in increased power requirements. In this work, we present full-wave electromagnetic modeling and analysis of an end-flanged shield for use with an asymmetric head gradient coil. Differences in B1 maps with and without the flanged shield indicate that flanged shield is effective in ameliorating RF field leakage to the gradient coils. Bench measurements also show that Q of the RF coil improved from 50 (without flanged shield) to 185 (with flanged shield).

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