Abstract
Treatment for deep local cancer has not yet been established. We propose a hyperthermia treatment method for deep local cancer by using implantable electrodes. In this study, a method for suppressing the edge effect in the implantable electrode was examined using electromagnetic and thermal simulation. Three types of models were proposed for this method—one with a bolus, one without a bolus, and one in the shape of the insulation sheet—and their temperature distributions were evaluated. The best model was then applied to a numerical human model that included 51 types of tissue and the pancreas (target organ), and the temperature was evaluated. As a result, temperature rise value of 1.5 °C in the deep of the target organ and that of 4.5 °C near the heating electrodes were obtained when the input power to the electrodes was 2 W at a frequency of 8 MHz. Therefore, it was found that the bolus and the insulation sheets covering the stepped edge of the electrode were effective to suppress the edge effect near the electrodes and to increase the temperature of the deep in the target organ. Thus, our method has a high capacity for deep local heating.
