Abstract #0357

Effect of transmit frequency on RF heating of metallic implants

Bart R. Steensma¹, Janot P. Tokaya², Peter R. S. Stijnman¹, M. Arcan Erturk³, Cornelis A. T. van den Berg¹, and Alexander J. E. Raaijmakers⁴

¹Center for Image Sciences - Computational Imaging Group, University Medical Center Utrecht, Utrecht, Netherlands, ²TNO, Utrecht, Netherlands, ³Medtronic, Minneapolis, MN, United States, ⁴Biomedical Engineering - Medical Imaging Analysis, Eindhoven University of Technology, Eindhoven, Netherlands

The effect of transmit frequency on the risk of RF heating for elongated metallic implants was investigated through simulations in a phantom and a human model for 21, 64, 128 and 300 MHz. We demonstrate that for uniform E-field exposure, worst-case E-field enhancement at the tip reduces with increasing transmit frequency. However, for realistic E-field exposures, E-field enhancement increases with transmit frequency for similar B₁⁺ levels. For similar head SAR levels, E-field enhancement for worst-case implant length is roughly equal for all transmit frequencies. In all cases implant length is the main determinant of RF heating.

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