Development of ferrite core applicator system for deep-induction hyperthermia

Author

Kotsuka, Youji ; Hankui, Eiji ; Shigematsu, Yasushi

Author_Institution

Dept. of Telecommun., Tokai Univ., Kanagawa, Japan

Volume

44

Issue

10

fYear

1996

fDate

10/1/1996 12:00:00 AM

Firstpage

1803

Lastpage

1810

Abstract

To achieve deep-induction hyperthermia, a ferrite core applicator system has been developed. The clinical goal is to produce a temperature rise of 7.5°C at 10 cm tissue depth. Deep heating becomes possible by introducing an auxiliary electrode to control an eddy current. The auxiliary electrode has been designed to optimize the eddy current with respect to the magnetic flux density. The optimization was performed by solving the fundamental equation using the finite element method (FEM). A flexible auxiliary electrode, which can be used for clinical treatments, has been manufactured. Heating tests have been conducted with the new applicator system, which operates at 4.0 MHz. The experimental results demonstrate that the system is capable of producing a temperature rise of 7.5°C at 10 cm depth, without heating an overlaying fat layer

Keywords

biomedical equipment; eddy currents; ferrite devices; finite element analysis; hyperthermia; induction heating; magnetic cores; magnetic flux; radiation therapy; radiofrequency heating; 10 cm; 4.0 MHz; auxiliary electrode; clinical treatments; deep heating; deep-induction hyperthermia; eddy current; ferrite core applicator system; finite element method; flexible auxiliary electrode; fundamental equation; magnetic flux density; optimization; overlaying fat layer; temperature rise; tissue depth; Applicators; Design optimization; Eddy currents; Electrodes; Ferrites; Heating; Hyperthermia; Magnetic flux density; Optimization methods; Temperature control;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.539938

Filename

539938