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Abstract #1367

Variation in thermal maps during RF heating due to variation in electrical conductivity in TEM coil at 298 MHz

Muhammad Hassan Chishti 1 , Matthew R. Tarasek 1 , Margarethus M. Paulides 2 , and Desmond Teck Beng Yeo 1

1 GE Global Research Center, Niskayuna, New York, United States, 2 Erasmus Medical Center, Rotterdam, Netherlands

Synopsis: The uncertainty of electrical conductivity (σ) values used in electromagnetic (EM) simulations may lead to incorrect assessment of SAR and risks for tissue ablation in patients during MR imaging at ultra-high fields and in RF thermotherapy applications. In this work, we investigate the errors in predicted temperatures due to incorrect assignment of values to σ caused by (i) variations in reported values in the literature, and (ii) temperature-induced variations of σ. Results from our full-wave EM (298 MHz) and thermal simulations show that the uncertainties in σ may induce temperature prediction errors by up to 5.3 C.

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