부산대학교 도서관

Bone cancer has a prevalence in young population. Unfortunately, it presents a low level of morbidity but a very high level of mortality. Most common treatments for bone tumors are surgery (amputation), radiotherapy and chemotherapy. These treatments present side effects, which affects patients' life quality. Thermotherapy is a new friendlier alternative to treat this kind of tumors. Specifically, for thermal ablation, the tumor temperature must be around 60°C-100°C. There are several types of microcoaxial antennas designed to treat liver tissue; however, to treat bone tumors less options have been proposed. Two microwave antennas to treat bone tumors by thermal ablation were designed. The antennas were: 1) one slot, and, 2) one slot choked. Several simulations were done to evaluate the effect of different treatment conditions. The behavior of the antennas was modeled by the finite element method (COMSOL Multiphysics). Electromagnetic and thermal simulations were performed to predict the areas of higher energy absorption and heating. Several scenarios like slot length, antenna insertion among others were simulated. Results showed that the thermal pattern generated in tissues changes when the antenna design and treatment characteristics are modified. All antennas show their best results with a 3mm with a power loss around 20%. The SWR was around 2.350–1.484 for bone models; and around 2.401–1.418 for the multi-layer ones. On the other hand, the one slot choked antenna showed higher areas with therapeutic temperature than the one slot antenna.