The Distribution of Heating Potential Inside Lossy Spheres

Author

Kritikos, H.N. ; Schwan, Herrman P.

Author_Institution

Department of Bioengineering, Moore School of Electrical Engineering, University of Pennsylvania, Philadelphia, Pa. 19174.

Issue

6

fYear

1975

Firstpage

457

Lastpage

463

Abstract

The distribution of the heating potential inside a lossy sphere having the same electrical characteristics as those of brain tissue was investigated in the frequency region of 10 MHz to 12 GHz. The conditions under which a potential hot spot appears inside the sphere and its shape were determined and were displayed in a radius vs. frequency diagram. The results show that hot spots appear inside only for spheres with radii 8 cm > R > 0.1 cm and only in the frequency range of 300 < f < 12,000 MHz. It was found that the heating potential is always non-uniformly distributed, and in cases where it was maximum inside the sphere it was larger by a factor of approximately ten to the values calculated by the plane slab or the average cross section model.

Keywords

Biological tissues; Brain; Dielectric losses; Electromagnetic fields; Electromagnetic heating; Frequency; Humans; Shape; Temperature; Testing; Animals; Brain; Electromagnetics; Electrophysiology; Heat; Humans; Models, Anatomic; Models, Biological; Models, Structural; Thermodynamics;

fLanguage

English

Journal_Title

Biomedical Engineering, IEEE Transactions on

Publisher

ieee

ISSN

0018-9294

Type

jour

DOI

10.1109/TBME.1975.324465

Filename

4120972