Design of Flanged RF Shield for Mitigation of RF and Gradient Coil Interactions
Muhammad Hassan Chishti 1 , Jean-Baptiste Mathieu 1 , Joseph E Piel 1 , Desmond T.B. Yeo 1 , Christopher J Hardy 1 , Dominic Graziani 1 , and Seung-Kyun Lee 1
GE Global Research Center, Niskayuna, New
York, United States
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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