The Distribution of Heating Potential Inside Lossy Spheres
Kritikos JN, Schwan HP · 1975
In brain-tissue model spheres, heating potential was never uniform, with potential hot spots at 300 to 12,000 MHz for radii between 0.1 and 8 cm.
Plain English Summary
Researchers studied how radiofrequency energy heats brain tissue by examining spheres with the same electrical properties as brain tissue across frequencies from 10 MHz to 12 GHz. They found that potential hot spots of concentrated heating appear inside the spheres only for radii between 0.1 cm and 8 cm and only in the frequency range of 300 to 12,000 MHz. The heating potential was never uniform, creating localized areas of higher energy absorption.
Why This Matters
This 1975 study examined the distribution of heating potential inside a lossy sphere with the same electrical characteristics as brain tissue, across frequencies from 10 MHz to 12 GHz. The research demonstrates that the heating potential is always non-uniformly distributed, with potential hot spots inside only for spheres with radii between 0.1 cm and 8 cm and only in the frequency range of 300 to 12,000 MHz. Where the heating potential was maximum inside the sphere, it was larger by a factor of approximately ten than the values calculated by the plane slab or the average cross section model. A non-uniform distribution implies the possibility of non-uniform temperature rise or the creation of hot spots.
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Show BibTeX
@article{the_distribution_of_heating_potential_inside_lossy_spheres_g6393,
author = {Kritikos JN and Schwan HP},
title = {The Distribution of Heating Potential Inside Lossy Spheres},
year = {1975},
}