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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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