Imaging the 3D temperature distributions caused by exposure of dielectric phantoms to high-frequency electromagnetic fields

Author

Suzuki, Y. ; Baba, M. ; Taki, M. ; Fukunaga, K. ; Watanabe, S.

Author_Institution

Dept. of Electr. & Electron. Eng., Tokyo Metropolitan Univ.

Volume

13

Issue

4

fYear

2006

Firstpage

744

Lastpage

750

Abstract

A new method of measuring the temperature distribution due to high frequency electromagnetic field (HF-EMF) power absorption is established. The method is applied to the measurement of the spatial distribution of specific absorption rate (SAR) in tissue exposed to HF-EMF. A microencapsulated thermotropic liquid crystal (MTLC) is employed as the temperature probe because of high resolution and high sensitivity. A high-molecular gel phantom with a high transparency and a high viscosity is developed to realize visualization technique with MTLC. The complex permittivity of the phantom is adjusted to that of muscle at 900 MHz and 1.45 GHz. This method is proven to be efficient in visualizing HF-EMF power absorption by exposure experiment

Keywords

biological effects of fields; biomedical measurement; biothermics; electromagnetic fields; liquid crystals; muscle; phantoms; temperature distribution; temperature measurement; 1.45 GHz; 3D temperature distribution measurement; 900 MHz; HF-EMF; dielectric phantoms; high frequency electromagnetic field power absorption; high-molecular gel phantom; microencapsulated thermotropic liquid crystal; muscle; permittivity; specific absorption rate; temperature probe; tissue exposure; visualization technique; Dielectric measurements; Electromagnetic fields; Electromagnetic measurements; Electromagnetic wave absorption; Frequency measurement; Imaging phantoms; Power measurement; Temperature distribution; Temperature measurement; Visualization;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/TDEI.2006.1667731

Filename

1667731