Abstract #2629

When they go high, go low? (Maybe, but not so fast): Comparing RF heating of active implantable medical devices in 0.55 T vs. 1.5 T horizontal scanners

Pia Panravi Sanpitak¹, Bhumi Bhusal¹, Bach Nguyen¹, Fuchang Jiang², Ehsan Kazemivalipour^3,4, Giorgio Bonmassar^3,4, Julie Pilitsis⁵, Joshua Rosenow⁶, Gregory Webster⁷, Andrada Popescu⁸, Daniel Kim¹, and Laleh Golestanirad^1,2

¹Department of Radiology, Northwestern University, Chicago, IL, United States, ²Department of Biomedical Engineering, Northwestern University, Evanston, IL, United States, ³A.A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Charlestown, MA, United States, ⁴Harvard Medical School, Boston, MA, United States, ⁵Department of Neurosciences & Experimental Therapeutics, Albany Medical College, Albany, NY, United States, ⁶Department of Neurosurgery, Northwestern University, Chicago, IL, United States, ⁷Division of Cardiology, Department of Pediatrics, Northwestern University, Chicago, IL, United States, ⁸Department of Medical Imaging, Lurie Children's Hospital, Chicago, IL, United States

Synopsis

Low-field Magnetic Resonance Imaging (MRI) systems are gaining traction, but their impact on radiofrequency (RF) heating of elongated implants is unclear. The RF heating of conductive lead models with realistic trajectories was examined inside a 1.5 T MRI coil and a 0.55 T Wide Bore MRI coil. 0.1g-SAR was recorded at the tips of conductive implanted leads in adult patients with deep brain stimulation (DBS) systems and pediatric patients with cardiac implants, at both chest and head landmarks. In some instances, heating was higher in the 0.55 T coil, so caution must be exercised before promoting low-field coils as "implant-friendly".

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