Modelos Teóricos basados en Métodos Numéricos de un Aplicador Cool-tip para Ablación RF de Tumores: Relación entre la Temperatura y la Impedancia
We have analyzed by means of theoretical mod-els (Finite Difference Method FDM, and Finite Elements Me-thod FEM) the relation between the temperature distributions around a Cool-tip RF electrode for tumor ablation, and the progress of the electrical impedance. The results suggest that the sudden impedance increase (aka roll-off) is produced just when the strongly desiccated tissue (temperatures around 100°C) totally encircles the electrode. The desiccated tissue is characterized by a very low electrical conductivity. This result could suggest an explanation for the electrical-thermal performance of other kind of electrodes in which a saline infusion is combined with the internal cooling.
Palabras clavesablación por radiofrecuencia ablación de tumores diferencias finitas elementos finitos
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