The modeling analysis on porous media hepatic cancer for microwave ablation of an interstitial helix-antenna

Abstract

Microwave ablation is processed, which uses the electro-magnetic transform into heat to destruction or kill cancer cells. This study presents analyses of 2.45GHz Helix-antenna configuration and design for porous hepatic cancer microwave ablation by using 3D-finite-element model. The configurations of Helix-antenna were considered: Tipped tip helix antenna (THA) and Extension tip helix antenna (EHA). 3D finite-element models were utilized to investigate the tissue temperature distribution during and after microwave ablation. The study aims to understand the influences of antenna type on the specific absorption rates (SAR) along the helix-antenna insertion depths and the ablation zone (heating profile and lesion volume) inside the hepatic cancer porous models with 5 cm-in-diameter tumor. All scenarios were the initial power was set at 50 W and simulated under temperature-controlled mode (90°C). Based on the preliminary results, the result illustrates that the THA occur the SAR and heating profile at the lateral around of the antenna, while the SAR and heating trend of EHA occur skew toward of the tip antenna. Both antennas destroy unwanted tissue, but the THA use longer duration than EHA for ablating unwanted tissue. The duration of ablation was 700s, respectively, the coagulation volume of THA and EHA were 95.45 and 104.27 cm3