Modeling of electromagnetic and temperature distributions of an intersticial coaxial-based choked antenna for hepatic tumor microwave ablation

Abstract

Liver tumors can be treated by microwave ablation, a therapy in which the goal is to increase the tissue's temperature in order to induce necrosis. For the application of microwave ablation interstitial antenna applicators have been developed with the objective of delivering and focusing energy deposition on the tissue in an effective manner. Choked antennas propose an ideal solution, as they are capable of producing a punctual hot-spot that prevents backward heating of the antenna. In this work designs for a choked and un-choked metal-tip monopole antenna are presented and modeled using finite element method to obtain their heating patterns, power deposition and temperature distributions, compare them and analyze the effects of the metallic choke over the same base antenna design at a frequency of 2.45 GHz and a power of 10 W.