A comparison study of electrodes for neonate electrical impedance tomography

Rahal, Mohamad and Khor, Joo Moy and Demosthenous, Andreas and Tizzard, Andrew and Bayford, Richard (2009) A comparison study of electrodes for neonate electrical impedance tomography. Physiological Measurement, 30 (6). pp. 73-84. ISSN 0967-3334

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Official URL: http://dx.doi.org/10.1088/0967-3334/30/6/S05

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Abstract

Electrical impedance tomography (EIT) is an imaging technique that has the potential to be used for studying neonate lung function. The properties of the electrodes are very important in multi-frequency EIT (MFEIT) systems, particularly for neonates, as the skin cannot be abraded to reduce contact impedance. In this work, the impedance of various clinical electrodes as a function of frequency is investigated to identify the optimum electrode type for this application. Six different types of self-adhesive electrodes commonly used in general and neonatal cardiology have been investigated. These electrodes are Ag/AgCl electrodes from the Ambu(R) Cardiology Blue sensors range (BR, NF and BRS), Kendall (KittyCat(TM) and ARBO(R)) and Philips 13953D electrodes. In addition, a textile electrode without gel from Textronics was tested on two subjects to allow comparison with the hydrogel-based electrodes. Two- and four-electrode measurements were made to determine the electrode-interface and tissue impedances, respectively. Themeasurements weremade on the back of the forearm of six healthy adult volunteers without skin preparation with 2.5 cm electrode spacing. Impedance measurements were carried out using a Solartron SI 1260 impedance/gain-phase analyser with a frequency range from 10 Hz to 1MHz. For the electrode-interface impedance, the average magnitude decreased with frequency, with an average value of 5 kOHM at 10 kHz and 337 OHM at 1 MHz; for the tissue impedance, the respective values were 987 OHM and 29 OHM. Overall, the Ambu BRS, Kendall ARBO(R) and Textronics textile electrodes gave the lowest electrode contact impedance at 1 MHz. Based on the results of the two-electrode measurements, simple RC models for the Ambu BRS and Kendall-ARBO and Textronics textile electrodes have been derived for MFEIT applications.

Item Type:Article
Research Areas:Middlesex University Schools and Centres > School of Science and Technology > Natural Sciences
Middlesex University Schools and Centres > School of Science and Technology > Natural Sciences > Biophysics and Bioengineering group
Citations on ISI Web of Science:5
ID Code:9323
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Deposited On:27 Aug 2012 07:21
Last Modified:08 Oct 2014 10:52

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