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Abstract #4178

Mitigating heating risk for long active metallic-backbone or metallic-braided cardiovascular devices using miniaturized Baluns (MBaluns): Design parameters, heating tests, and swine validation

Akbar Alipour1, Eric S Meyer1, Wolfgang Loew2, Ronald D Watkins3, Hassan Elahi1, Aravindan Kolandaivelu1, Susumo Tao1, Michael A Guttman1, Jeff Schweitzer4, Gregory Olson4, Henry R Halperin1, and Ehud J Schmidt1

1School of Medicine, Johns Hopkins University, Baltimore, MD, United States, 2Cincinatti Children’s Hospital Medical Center, Cincinnati, OH, United States, 3Stanford University, Stanford, CA, United States, 4Abbott Laboratories, Minnetonka, MN, United States

Long (>wavelength/4) actively-tracked metallic-backbone or metallic-braided cardiovascular devices are not used in MRI-guided interventions due to surrounding-tissue heating concerns. Such devices may be used if induced currents on the metallic-backbone and internal cables are sufficiently attenuated. At ISMRM 2018 we demonstrated a miniaturized resonant floating Balun (MBalun), and two actively-tracked MRI-guided metallic interventional devices built using MBaluns. MBaluns were constructed with loosely-wound solenoids overlaid on the metallic-backbones, generating strong transverse magnetic fields that attenuated surface currents and internal-cable common-mode currents. We now provide electromagnetic simulation revealing MBalun critical dimensions, along with phantom heating and swine experiments that validate the designs.

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