An Inexpensive System for Measuring the Dielectric Properties of Biological Tissues Using an Open-Ended Coaxial Probe

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21460%2F25%3A00383432" target="_blank" >RIV/68407700:21460/25:00383432 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1109/TIM.2025.3561426" target="_blank" >https://doi.org/10.1109/TIM.2025.3561426</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1109/TIM.2025.3561426" target="_blank" >10.1109/TIM.2025.3561426</a>

Result language

angličtina

Original language name

An Inexpensive System for Measuring the Dielectric Properties of Biological Tissues Using an Open-Ended Coaxial Probe

Original language description

Knowledge of the dielectric parameters of biologicaltissues is important in a wide range of medical applications ofelectromagnetic fields. Commercial systems using high-qualityvector network analyzers (VNAs) are expensive and can be abarrier to the development of existing and emerging applications.Therefore, the main objective of this work was to investigatethe potential of using inexpensive VNAs, which is available onthe market, to measure the dielectric parameters of biologicaltissues. To accomplish this task, a system for the measurementof dielectric properties of biological tissues in the frequency rangefrom 70 MHz to 3 GHz using inexpensive VNAs was developedand presented. The system consists of pocketVNA 2.0 and acustom-made coaxial reflection probe with a diameter of 2.2 mm.The virtual line model of the coaxial probe was used to convertthe measured reflection coefficients to the complex permittivity.A total of five ex vivo tissues (heart, muscle, liver, kidney cortex,and fat) and two standard liquids (isopropanol and ethanol) weremeasured. The lower accuracy and lower signal-to-noise ratio ofthe inexpensive VNA were compensated for by postprocessingof the measured data, including a time-domain gating andfitting of the evaluated dielectric properties to the Cole-Coleand Debye models for tissues and standard liquids, respectively.The measurement results were compared to the results obtainedwith a commercial measurement system, and both the standarddeviation and mean absolute percentage error (MAPE) wereevaluated and presented. The lowest achieved MAPE of biologicaltissues was for fit relative permittivity 4.35% (fat,f<200 MHz)and 0.66% (kidney cortex, f > 200 MHz) and for fit equivalentelectrical conductivity 2.58% (heart,f<200 MHz) and 3.83%(heart, f > 200 MHz)

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20601 - Medical engineering

Project

—

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

IEEE Transactions on Instrumentation and Measurement

ISSN

0018-9456

e-ISSN

1557-9662

Volume of the periodical

74

Issue of the periodical within the volume

4008011

Country of publishing house

US - UNITED STATES

Number of pages

11

Pages from-to

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UT code for WoS article

001479467200034

EID of the result in the Scopus database

2-s2.0-105002771390