Improvement of the resonant cavity applicator for brain tumor hyperthermia - Experimental heating results -

A re-entrant type resonant cavity applicator for deep tumor hyperthermia treatment was presented. In this method, a human body is placed between the gap of the inner re-entrant cylinders, and is heated with electromagnetic fields stimulated in the cavity without contact between the surface of the human body and the applicator. In this paper, two methods to control the heating pattern were proposed. In the first method, a human body was moved towards the electrode. In the second method, the diametric ratio of the inner electrode was changed. The controllable range of heating pattern was about 20% of the distance from the center of the agar phantom in the direction of depth.