Modeling of RF thermal ablation taking into account the temperature dependence of the tissue properties

Autores/as

  • Douglas Deas Yero Universidad de Oriente - Centro Nacional de Electromagnetismo Aplicado
  • Fidel Gilart González Universidad de Oriente - Centro Nacional de Electromagnetismo Aplicado
  • Dirk Van Troyen KU Leuven University - Laboratoria De Nayer
  • Guy A. E. Vandenbosch KU Leuven University

Palabras clave:

Radio frequency thermal ablation (RFTA), 2D FEM modeling, electro-thermal properties of tissues

Resumen

The outcome of radio frequency thermal ablation (RFTA) is significantly affected by the tissue electrical conductivity; thus, understanding the changes of this property during heating is fundamental to suitably model the medical procedure. In this work a reasonable procedure is proposed for selecting the appropriate experimental data of the temperature dependence of electrical conductivity for the simulation taking into account the heating rate at which the data was acquired and the power that will be delivered to the electrodes in the RFTA situation of interest, based on the computing of the time average of the heating rate in a representative point of the ablation zone. The numerical results confirmed that the use of lower frequencies (20 kHz) than currently used during RFTA (450 kHz) may result in preferential heating of the tumor and consequently in less damage on healthy tissue. Also, the effect on the computed thermal lesion size of three different models of the temperature dependence of electrical conductivity used for the simulation of a RFTA situation at 20 and 450 kHz, entailing the presence of three materials with different dielectric properties (normal liver tissue, tumor gel phantom and muscle saline phantom) was investigated. The results demonstrated that not only the initial (baseline) electrical conductivity is important in predicting the lesion size, but also it is the model of the temperature dependence of electrical conductivity.  

Biografía del autor/a

Douglas Deas Yero, Universidad de Oriente - Centro Nacional de Electromagnetismo Aplicado

Electrical Engineer, MSc in Electrical Engineering from the Universidade Federal de Santa Catarina, Brasil, Centro Nacional de Electromagnetismo Aplicado, Santiago de Cuba, Cuba, E-mail: douglas@uo.edu.cu. Now he is working toward his PhD degree in Bioengineering from the Universidad de Oriente. His main research interests are in medical application of microwave technique, particularly hyperthermia.

Fidel Gilart González, Universidad de Oriente - Centro Nacional de Electromagnetismo Aplicado

BS in Physics, PhD in Physical Sciences from the Universidad de Oriente, Cuba, Centro Nacional de Electromagnetismo Aplicado, Santiago de Cuba, Cuba, E-mail: fgg@uo.edu.cu. His research interests are the interaction between nonionizing electromagnetic radiation and biological systems, and industrial and medical applications of electromagnetic fields, including design, modeling and simulations.

Dirk Van Troyen, KU Leuven University - Laboratoria De Nayer

Received the MSc degree in Industrial Engineering from KU Leuven Technology Campus Ostend in 1981, the MSc degree in Electronics Engineering from KU Leuven in 1987, the MSc in Mechanical-Electrotechnical Engineering from DHO-Brussels in 1999 and the PhD in Applied Sciences in 1995 from KU Leuven. His main research activities are EMC, Antennas and Propagation and R.F.-Radio Science. He is currently a Professor at the KU Leuven De Nayer and C.E.O. of Laboratoria De Nayer.

Guy A. E. Vandenbosch, KU Leuven University

Received the MSc and PhD degrees in Electrical Engineering from the Katholieke Universiteit Leuven, Leuven, Belgium, in 1985 and 1991, respectively. From 1991 to 1993, he held a postdoctoral research position at the Katholieke Universiteit Leuven. His research interests are in the area of electromagnetic theory, computational electromagnetics, planar antennas and circuits, nano-electromagnetics, EM radiation, EMC, and bio-electromagnetics.

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Publicado

2018-11-20

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