Title :
Resonant circuits for hyperthermia excited by RF magnetic field of MRI
Author :
Morita, Minoru ; Inoue, Takeru ; Yamada, Tomoaki ; Takemura, Y. ; Niwa, Takashi ; Inoue, Takeru
Author_Institution :
Dept. of Electr. & Comput. Eng., Yokohama Nat. Univ., Japan
Abstract :
The hyperthermia using a magnetic resonance imaging (MRI) is proposed. A resonant circuit consisting of a closed connection of coil and capacitor was used as an implant heated by an external ac magnetic field. Its resonant frequency was 63.9 MHz. The maximum temperature rise of 40°C was obtained from the thermally insulated resonant circuit by applying the field of 0.034 Oe with continuous wave. The rf magnetic field of the MRI with a low duty factor could raise the circuit temperature up to 13°C. This therapeutic method enables a repeated combination of the hyperthermia treatment and MRI diagnosis by confirming the operated effect.
Keywords :
biomedical MRI; circuit resonance; hyperthermia; magnetic circuits; magnetic fields; radiation therapy; 63.9 MHz; RF magnetic field; RF magnetic fields; biomedical MRI; circuit resonance; external AC magnetic field; hyperthermia; magnetic circuits; magnetic resonance imaging; resonant circuits; Capacitors; Coils; Hyperthermia; Implants; Magnetic fields; Magnetic resonance imaging; RLC circuits; Radio frequency; Resonant frequency; Temperature; Hyperthermia; MRI; resonant circuit; rf magnetic field;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2005.854788
