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 Kazemivalipour3,4, Giorgio Bonmassar3,4, Julie Pilitsis5, Joshua Rosenow6, Gregory Webster7, Andrada Popescu8, Daniel Kim1, and Laleh Golestanirad1,2
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
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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