Magnetically induced surface charges on samples in magnetic resonance imaging radio-frequency coils: Effect on electric fields, sample losses, and coil resonance

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Abstract
We present a solution to Maxwell's equations which describe the inductive interaction between an irregularly shaped sample in a magnetic resonance imaging rf coil. It is demonstrated that the inductive interaction between the coil and sample can induce charge densities on the sample surface and that these charge densities lead to observable changes in coil Q, resonant frequency offset and sample power dissipation.