Simulation on Temperature Distribution of Effective Lesion Area for Tumor Microwave Ablation Thermotherapy

Real-time temperature distribution monitoring during the microwave ablation of tumor is a key problem in thermotherapy.In this paper,the tissue temperature distribution was simulated by computer and a simulation method of temperature field during microwave ablation based on finite element was proposed.The effect brought by microwave transmission power,lasted time and tissue thermal physical parameters on temperature distribution was simulated respectively.The results showed that the temperature of the entire field ascended by 20% as the microwave transmission power increased by 25%;temperature ascended by 40% as the power increased by 50% and temperature ascended by 60% as the power increased by 75%.The entire temperature field unchanged but the volume of effective lesions increased as the time prolonged,the volume increased by 150% as time prolonged two times.Thermal conductivity had effect on thermal energy spread in the far field.The accuracy of the simulation had been proved through experiments.The experimental results and simulation results were almost the same and this proved the accuracy of the simulation method.The results have great value for preoperative simulation,determination of the microwave transmission power and lasted time,formulating rational operation plan before microwave ablation thermotherapy.