Development and Analysis of Coaxial Slot Antenna in Comparison with Coaxial Dipole Antenna for Interstitial Microwave Ablation

摘要

Hepatocellular carcinoma (HCC) is the most common malignant tumors to affect the liver. Microwave ablation is efficiently used for treatment of liver cancer. Although surgical resection remains the gold standard for treatment of liver cancer, but only 5-10% patients are the candidates for surgical resection due to numbers of limitations. Because most patients with HCC can not be treated with surgery or transplantation, thermal ablative treatments have started to become viable alternative methods to treat those patients. Microwave ablation (MWA) has shown great promise for the treatment of unresectable liver tumor and exhibits many perceived advantages. This attraction has driven the researchers to develop innovative antennas to effectively treat the deep seated hepatic tumors. In this paper, a two dimensional Finite Element Method (FEM) is used to measure and simulate the results of the coaxial slot antenna and coaxial dipole antenna. These two antennas are compared and discussed, while noting the similarities and differences between the heating patterns near the tip of the antenna. It was found that dipole coaxial antenna is more prone to backward heating and causes detrimental tissue heating along the antenna insertion region with respect to coaxial slot antenna.