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Bipolar radiofrequency ablation with 2 × 2 electrodes as a building block for matrix radiofrequency ablation: Ex vivo liver experiments and finite element method modelling.

Onglets principaux

Mulier, Stefaan Jiang, Yansheng Jamart, Jacques [UCL] Wang, Chong Feng, Yuanbo Michel, Luc [UCL] Ni, Yicheng

(eng) PURPOSE: Size and geometry of the ablation zone obtained by currently available radiofrequency (RF) electrodes is highly variable. Reliability might be improved by matrix radiofrequency ablation (MRFA), in which the whole tumour volume is contained within a cage of x × y parallel electrodes. The aim of this study was to optimise the smallest building block for matrix radiofrequency ablation: a recently developed bipolar 2 × 2 electrode system. MATERIALS AND METHODS: In ex vivo bovine liver, the parameters of the experimental set-up were changed one by one. In a second step, a finite element method (FEM) modelling of the experiment was performed to better understand the experimental findings. RESULTS: The optimal power to obtain complete ablation in the shortest time was 50-60 W. Performing an ablation until impedance rise was superior to ablation for a fixed duration. Increasing electrode diameter improved completeness of ablation due to lower temperature along the electrodes. A chessboard pattern of electrode polarity was inferior to a row pattern due to an electric field void in between the electrodes. Variability of ablation size was limited. The FEM correctly simulated and explained the findings in ex vivo liver. CONCLUSIONS: These experiments and FEM modelling allowed a better insight in the factors influencing the ablation zone in a bipolar 2 × 2 electrode RF system. With optimal parameters, complete ablation was obtained quickly and with limited variability. This knowledge will be useful to build a larger system with x × y electrodes for MRFA.

Type de document Article de périodique (Journal article) – Article de recherche
Type d'accès Accès restreint
Année de publication 2015
Langue Anglais
Information sur le périodique "International Journal of Hyperthermia" - Vol. 31, no. 6, p. 649-665 (2015)
Peer reviewed oui
Editeur Informa Healthcare ((United Kingdom) London)
issn 0265-6736
e-issn 1464-5157
Statut de la publication Publié
Affiliations UCL - (MGD) Service de chirurgie
UCL - SSS/IREC/CHEX - Pôle de chirgurgie expérimentale et transplantation
UCL - SSS/IREC/MONT - Pôle Mont Godinne
UCL - (MGD) Unité de support scientifique
Mots-clés Bipolar ; Finite element method ; Liver ; Radiofrequency ablation ; Matrix
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