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Abstract #0105

The Shielding of RF MRI Coils Using Double-Sided EMI Shield

Ibrahim Abu El-Khair1, Jan G. Korvink1, Juergen Hennig2, Gerhard Moenich3

1Dept. of Microsystems EngineeringIMTEK, University of Freiburg, Freiburg, Germany; 2Dept. of Diagnostic Radiology, Medical Physics, University Hospital Freiburg, Freiburg, Germany; 3Dept. of Radio Frequency Technology, Technical University of Berlin, Berlin, Germany

Radiation losses associated with RF coils increase up to the fourth power of frequency; it becomes significant at high fields above 2 Teslas. Furthermore, loading an RF MRI Coil with a sample leads to a shift in the resonant frequency, f0 away from the one specified. This also leads to a very poor reception at f0. A double-sided EMI (ElecroMagnetic Interference) shield using the CTLM (Coaxial Transmission Line Modeling) technique of shielding restores f0, and eliminates the radiation loss. The mutual capacitive coupling among the neighboring coils within an array, and associated electronics, is also eliminated