MR Safety of Magneto-inductive Receivers

Radio frequency heating may be induced when linear conductors are inserted in the body during MRI, due to electrical excitation of surface wave resonances. The effect occurs even when inserted lengths are short, due to the high RF dielectric constant of tissue. We have developed receivers for internal imaging using magneto-inductive waveguides, a form of transformer-segmented waveguide that can be realized in thin film form and mounted on a catheter. This paper presents accurate EM simulation using AWR Microwave Office designed to confirm RF safety. The results highlight the effect of heatshrink material on surface wave resonances and parasitic capacitances.

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