Resonant circuits for thermal therapy excited by RF magnetic field from MRI

A resonant circuit is expected to use as an implant for thermal therapy of cancer (hyperthermia), which is heated effectively by an alternating magnetic field. A new technique for hyperthermia using magnetic resonance imaging (MRI) equipment for the excitation source is proposed. Normal 1.5 T type MRI equipment of clinically used in hospital could rise the temperature of the implant up to 10 deg. C. In the experiments, a magnetic field of RF pulse under a normal diagnosis procedure of the MRI system was applied to the implant. It is advantageous that the commercial MRI equipment can be used for the hyperthermia because the therapeutic procedure can be repeated after confirming results from the MRI diagnosis. The control of the temperature rise depending on the position of the implant in the MRI is achieved.