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Medicina is published by MDPI from Volume 54 Issue 1 (2018). Articles in this Issue were published by another publisher in Open Access under a CC-BY (or CC-BY-NC-ND) licence. Articles are hosted by MDPI on mdpi.com as a courtesy and upon agreement with Lithuanian Medical Association, Lithuanian University of Health Sciences, and Vilnius University.
Open AccessArticle

Investigation of radiofrequency ablation process in liver tissue by finite element modeling and experiment

1
Department of System Analysis, Kaunas University of Technology
2
Institute for Biomedical Research
3
Department of Surgery, Kaunas University of Medicine, Lithuania
*
Author to whom correspondence should be addressed.
Medicina 2007, 43(4), 310; https://doi.org/10.3390/medicina43040039
Received: 21 August 2006 / Accepted: 8 March 2007 / Published: 13 March 2007
Background. The character of ablation processes with high-frequency electrical current is similar in most biological tissues; however, quantitative characteristics are very different. Consequently, mathematical models of the process have a lot of specific aspects. In this study, we developed mathematical model of radiofrequency ablation in liver tissues with experimental validation of model in ex vivo porcine liver.
Methods
. The finite element nonlinear computational model for the simulation of the radiofrequency ablation processes and taking into account coupled electrical and thermal phenomena has been developed. The radiofrequency electric current processes are dominated by the active electric conductivity. The heat generation in biological tissues is determined by the electric current density. Simultaneously, the conductivity of the tissue is nonlinearly dependent upon the temperature of the tissue. The model has been implemented in COMSOL Multiphysics computational environment. Tests on physical characteristics of the thermal effect in ex vivo liver tissue have been performed and results compared.
Results. Two oval-shaped zones of total and relative tissue destruction were highlighted. The principal distribution of the thermal effect is congruous with the theoretical model; however, the discrepancy of temperatures in experimental and theoretical models increases distally from active perfusion electrode.
Conclusions
. Distribution of the thermal effect is congruous in the theoretical and experimental model; however, discrepancies of temperatures imply certain inadequacies of the mathematical models. Differences of computed and actual temperatures should be regarded predicting tissue ablation in clinical setting.
Keywords: radiofrequency ablation; computational modeling; ex vivo experimental research radiofrequency ablation; computational modeling; ex vivo experimental research
MDPI and ACS Style

Barauskas, R.; Gulbinas, A.; Barauskas, G. Investigation of radiofrequency ablation process in liver tissue by finite element modeling and experiment. Medicina 2007, 43, 310.

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