Abstract #0358

Demystifying the effect of field strength on RF heating of conductive leads: A simulation study of SAR in DBS lead models during MRI at 1.5 T - 10.5 T

Ehsan Kazemivalipour^1,2,3, Alireza Sadeghi-Tarakameh⁴, Boris Keil⁵, Yiğitcan Eryaman⁴, Ergin Atalar^1,2, and Laleh Golestanirad^3,6

¹Electrical and Electronics Engineering Department, Bilkent University, Ankara, Turkey, ²National Magnetic Resonance Research Center (UMRAM), Bilkent University, Ankara, Turkey, ³Department of Radiology, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States, ⁴Center for Magnetic Resonance Research (CMRR), University of Minnesota, Minneapolis, MN, United States, ⁵Institute of Medical Physics and Radiation Protection, Mittelhessen University of Applied Sciences, Giessen, Germany, ⁶Department of Biomedical Engineering, McCormick School of Engineering, Northwestern University, Evanston, IL, United States

We examined the effect of magnetic field strength, and by proxy RF resonance frequency, on RF heating of deep brain stimulation (DBS) lead models during RF exposure covering frequencies from 64MHz (1.5T) to 447MHz (10.5T). We report 1g-SAR at the tips of a cohort of 33 DBS implant models with realistic trajectories when the input power of RF coils was adjusted to impose safety limits based on either B₁⁺ or global head SAR. We observed that coils with higher resonance frequency generated a lower 1g-SAR around implanted leads when the global head SAR was kept constant across different coils.

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