Simulation Of Temperature Distribution Induced By Coaxial-slot Array For Interstitial Hyperthermia

Abstract

The sclccess of hyperthermia therapy depends on intratumoral temperatures uniformity above therapeutic temperatures, 42-43' C. We investigated temperature distributions in and around an array of seven interstitial antennas used for microwave cancer therapy. A calculated temperature distribution has wide heating region. The computed distribution meets experimental one. The simulation follows the three steps. 1) Solving the Helmholtz equation, we obtain an electric field from an electric current along an antenna. Here, we used a measured current distribution along a coaxial-slot antenna [l]. 2) We derive a specific absorption rate (SAR) from the electric field intensity obtained. And, 3) we obtain a computed temperature distribution from the SAR by solving a heat transfer equation. Solving equations in 1) and 3), we use the three-dimensional finite element method (3-D FEM).