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Item type:Publication, The modeling analysis on porous media hepatic cancer for microwave ablation of an interstitial helix-antenna(2018-06-23)Chaichanyut, M.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 cm<sup>3</sup> - Some of the metrics are blocked by yourconsent settings
Item type:Publication, The modeling of temperature distributions of an interstitial two-tine antenna for hepatic cancer microwave ablation(2017-06-22)Chaichanyut, M.Hepatic cancer can be treated by microwave ablation, a therapy in which the goal is to increase the tissue temperature in order to induce necrosis. For the application of microwave ablation interstitial antenna have been developed with the objective of delivering and focusing energy deposition on the tissue in an effective manner. In this study, microwave ablation analyses using 2.45 GHz Two-Tine (2T) antenna for hepatic cancer tissue. This research is designed for a 2T-Conductor back-choke (2T-CBC) and 2T-Dielectrics Back-choke antenna (2T-DBC) and modeled using finite element method to obtain their heating patterns, compare them and analyze the effects of the back-choke to treat by microwave ablation. A preliminary study was first carried out with regard to the specific absorption rates (SAR) along the 2T antenna insertion depths and the ablation zone (heating pattern and lesion volume) inside the hepatic cancer models with 5 cm-in-diameter tumor. All scenarios were simulated under temperature-controlled mode (90°C) and the initial power was set at 50 W. Based on the preliminary results, the result shows that the maximum SAR and lesion volume is higher than when using a 2T-DBC antenna for microwave ablation (97.31 cm3). The conductor tine and bake-choke of the antenna has effect to heating pattern and lesion volume.