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Measurements of electrical impedance of biomedical objects

Frączek M., Kręcicki T., Moroń Z., Krzywaźnia A., Ociepka J., Rucki Z., Szczepanik Z.

Acta of Bioengineering and Biomechanics

2016

Vol. 18, no. 1

11--17

Some basic problems related to measurements of electrical impedance of biological objects (bioimpedance) have been presented in this paper. Particularly problems arising from impedance occurring at the sensor–tissue interface (interfacial impedances) in contact measuring methods have been discussed. The influence of finite values of impedances of the current source and voltage measuring device has also been taken into consideration. A model of the impedance sensor for the four-electrode measurement method containing the interfacial, source and measuring device impedances has been given and its frequency characteristics obtained by the computer simulation have been presented. The influence of these impedances on the shape of frequency characteristic of the sensor model has been discussed. Measurements of bioimpedance of healthy and anomalous soft tissues have been described. Some experimental results, particularly the frequency characteristics of bioimpedance, have been shown. The presented results of measurement show that bioimpedance can be a valuable source of information about the tissues, so measurement of bioimpedance can be a useful supplement to other medical diagnostic methods.

Układy do pomiaru impedancji elektrycznej w zastosowaniach biomedycznych

Baszyński M.

Przegląd Elektrotechniczny

2009

R. 85, nr 2

10-12

Przedstawiony niżej tekst opisuje metody pomiarowe stosowane do pomiaru impedancji elektrycznej używane w zastosowaniach biomedycznych. Opisano również opracowany przez autora układ do cyfrowego pomiaru zespolonej impedancji elektrycznej.

These articles describe principles of most often used methods of electrical impedance measurements for biomedical purposes. Modern digital device for complex impedance measurement, designed by author, also has been presented.

Impedance spectroscopy by means of a digital storage oscilloscope-based measurement system

Bujnowski A., Wtorek J., Truyen B.

Biocybernetics and Biomedical Engineering

2004

Vol. 24, no. 4

53-66

A new system for bioimpedance spectroscopy is presented, which provides an alternative to commercial impedance analysers. Impedance analysers commonly have a limited number of operational modes and are often not well suited to specific applications. Because of its ability to combine an unlimited number of software processing procedures with the use of additional information channels, the system presented enables electrical impedance to be measured precisely. As it is based on digital storage oscilloscope architecture, hardware design is significantly simplified and specific signal detection algorithms may be incorporated.