Fundamental Study of a Combined Hyperthermia System with RF Capacitive Heating and Interstitial Heating.

Interstitial RF heating with an inserted electrode allows the heating position selection in a subject, but the narrow heating region is problematic. This study elucidates development of new interstitial RF heating methods, combining with external RF heating using paired electrodes, heating the subject broadly in advance in order to selectively extend the heating region. Two kinds of heating system were developed by controlling a differential mode and a common mode of RF currents. Heating experiments with a liquid adhesive subject enabled a wider effective heating region with higher initial temperatures of heating subjects by external RF heating, and larger interstitial electrode diameter.