Complex dielectric measurements and analysis of brain tissues in the radio and microwave frequencies

We present in-vitro complex dielectric measurements of gray and white matter of rat brains in the frequency range between 45 MHz and 26.5 GHz at body and room temperatures using the open-ended coaxial probe technique with an HP8510B network analyzer. The measurement data exhibited two separated disp...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 1997-10, Vol.45 (10), p.1730-1741
Main Authors: Jian-Zhong Bao, Shin-Tsu Lu, Hurt, W.D.
Format: Article
Language:English
Subjects:
Biological system modeling
Brain modeling
Coaxial components
Computer aided analysis
Dielectric measurements
Electromagnetic modeling
Electromagnetic scattering
Electromagnetic waves
Frequency response
In vitro
Microwave frequencies
Microwaves
Permittivity measurement
Probes
Temperature distribution
Tissue
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Summary:We present in-vitro complex dielectric measurements of gray and white matter of rat brains in the frequency range between 45 MHz and 26.5 GHz at body and room temperatures using the open-ended coaxial probe technique with an HP8510B network analyzer. The measurement data exhibited two separated dispersions, and were analyzed by means of a complex nonlinear least-squares technique. We suggest two empirical models to describe the experimental data: one containing two Cole-Cole functions was applied to the data from this paper, and another including one Havriliak-Negami and one Cole-Cole function was utilized to a combination of past and present literature data in a wider frequency range from 100 kHz to 26.5 GHz. The adoption of previously published data at the frequencies below 45 MHz increases the valid frequency range of the model.
ISSN:0018-9480
1557-9670
DOI:10.1109/22.641720