Finite Element Analysis on Porous Media: Geometric Monopole Antenna Shapes Affect Liver Tumor Microwave Ablation

Abstract

Microwave Ablation is a regularly used medical procedure for removal of the liver tumors, which uses the electromagnetic transform into heat for destruction or kills the hepatic tumor tissue. This paper presents a 3D finite-element method was designing the antenna of 2.45GHz, simulate to investigate analyses of the heating profile during and after hepatic tumor microwave ablation on porous media. The configurations of this study were two Ellipse tip monopole-antennas, which considered were: Symmetric Ellipse tip monopole (S-EM) and Non- symmetric Ellipse tip monopole antennas (NS-EM). The aims of this study to findings revealed that the Specific Absorption Rates (SARs) along the Ellipse monopole-antenna insertion depths, the heating profile and lesion volume (Ablation zone) within the hepatic tumor on porous models with 5 cm-in-diameter tumors. All scenarios were simulated under the temperature-controlled mode (90°C). Simulation results, illustrate that the local peaks of the SARs curves, both antennas occurred at the tip of Ellipse monopole-antenna. The profile of the SARs curves that the S-EM and NS-EM antenna models exhibited similar trends with slightly different amplitudes. The heating profile of both antennas occurred at the lateral around of the antenna, its destroy unwanted tissue. The duration of the NS-EM model was longer than the S-EM model for ablating unwanted tissue. Respectively, the duration ablating of S - EM models and NS-EM model to complete destruction of hepatic tumor were 680s and 700s.