Finite element analysis of the re-entrant type resonant cavity applicator for brain tumor hyperthermia.
In this paper, we have proposed a new heating method in which high frequency electric fields in a re-entrant type resonant cavity are used for the heating of deeply seated tumors. In this method, a human head 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 head and the applicator. Here, we proposed a new method to control the heating area. In this method, the resonant frequency inside the cavity was changed, then we use the TM010-like mode and the TM012-like mode from various types of the resonant frequency. First, the computer simulation results of electric and magnetic field patterns are presented. Second, a comparison of the heating properties of TM010-like mode and TM012-like mode are discussed. The heating area of the center of agar phantom is more concentrated by using TM012-like mode than that of using TM010-like mode. From these results, it is confirmed that the proposed method can be controlled to heat the various sizes of deep tumors.
Yabuhara
T
T
Department of Mechanical Engineering Informatics, Meiji University, Kawasaki, Japan. yabuhara@isc.meiji.ac.jp
Kato
K
K
Tsuchiya
K
K
Shigihara
T
T
Shindo
Y
Y
Iwazaki
R
R
Uzuka
T
T
Fujii
Y
Y
Takahashi
H
H
D001932:Brain Neoplasms / Q000503:physiopathology* / Q000628:therapy*; D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D020342:Finite Element Analysis; D006358:Hot Temperature; D006801:Humans; D006979:Hyperthermia, Induced / Q000295:instrumentation* / Q000379:methods; D008954:Models, Biological; D000078702:Radiofrequency Therapy; D013813:Therapy, Computer-Assisted / Q000295:instrumentation / Q000379:methods*; D014159:Transducers