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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