Microwave Applicators for Localized Hyperthermia Treatment of Malignant Tumors

Three types of microwave applicators have been developed for treating malignant tumors in humans: waveguide applicators, conformal "bean-bag" applicators using printed circuit antennas, and coaxial applicators. These applicators operate at a frequency of 915 or 2450 MHz and can raise the temperature of tumors to the hyperthermic range of 42.5 to 43.5/spl degree/C. Encouraging results have been obtained with these applicators in initial clinical trials involving approximately 50 patients.