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Abstract #1454

Analysis and Design of Lead Wires with Metallic Shielding for Reduction of RF Heating during MRI for Active Implants

Krishna Singhal1 and John A. Nyenhuis1

1Purdue University, West Lafayette, IN, United States

The purpose of this work is to provide a quantitative understanding of how a conducting metallic shield over a lead will reduce RF heating at the electrode during MRI scans. A physical model and equations for reduction of RF heating by a shielded lead are presented. Temperature rise were calculated for different lengths of shielded and unshielded leads. Confirming measurements were made for a quarter wavelength coaxial cable model of the lead. Measured temperature rise and transfer function depended on terminations conditions, with the open lead exhibiting a temperature rise approximately 10 times greater than the shorted lead.

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