Selective heating for microwave hyperthermia using ferrimagnetic resonance

A new microwave heating technique for hyperthermia treatment of cancer is presented. The technique uses the ferrimagnetic resonance of a ferrite-impregnated medium as the heating target. The target inside a lossy medium such as human tissue is biased by an applied static magnetic field from an electromagnet, and it is heated by radiated microwaves at 2450 MHz or 903 MHz generated externally, The energy dissipation rate in the ferrite-impregnated target increased over by 40 percent under the ferrimagnetic resonance condition as compared to nonresonance. Furthermore, the experimental results show that the selective heating of the target can be realized. The technique is useful for deep heating of the human body for hyperthermia treatment of cancer.