The determination of the electromagnetic field and SAR pattern of an interstitial applicator in a dissipative dielectric medium

Author

Zhang, Yang ; Dubal, Nilesh V. ; Takemoto-hambleton, Randall ; Joines, William T.

Author_Institution

Dept. of Electr. Eng., Duke Univ., Durham, NC, USA

Volume

36

Issue

10

fYear

1988

fDate

10/1/1988 12:00:00 AM

Firstpage

1438

Lastpage

1444

Abstract

The spatial distribution of microwave energy absorbed per unit mass (the specific absorption rate or SAR) in biological tissue is calculated for a class of interstitial antennas. The insulated interstitial applicator is simulated as an asymmetrically drive antenna. An expression for the electric field intensity near the antenna is derived and calculated by direct numerical evaluation of a surface integral over the insulation. The predicted SAR patterns obtained using the calculated electric field intensity and the tissue conductivity agree very well with the measured SAR distributions around three different applicators in muscle-equivalent phantoms

Keywords

biothermics; electromagnetic fields; radiation therapy; radiofrequency heating; RF heating; SAR pattern; asymmetrically drive antenna; biological tissue; biothermics; dissipative dielectric medium; electric field intensity; electromagnetic field; interstitial applicator; microwave energy; microwave hyperthermia; muscle-equivalent phantoms; spatial distribution; specific absorption rate; surface integral; tissue conductivity; Antenna measurements; Applicators; Biological system modeling; Biological tissues; Conductivity measurement; Dielectrics and electrical insulation; Electric variables measurement; Electromagnetic fields; Microwave antennas; Specific absorption rate;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.6092

Filename

6092