A study of composite electrode-tissue impedance

Author

Robinson, R.L. ; Davidson, J.L. ; Wright, P. ; Pomfrett, C.J.D. ; McCann, H.

Author_Institution

School of Electrical Engineering and Electronics, University of Manchester, PO Box 88, M60 1QD, UK

fYear

2008

fDate

20-25 Aug. 2008

Firstpage

1171

Lastpage

1174

Abstract

Electrical impedance tomography has been used in the medical environment for many years. Recently it has been used for brain function imaging. This type of technology uses a large number of electrodes on the scalp, examples in the literature ranging from 8 to 64. In this paper, the composite impedance of the electrode in contact with tissue is investigated. An experimental method has been developed to enable the use of a commercial impedance analyzer in compliance with medical safety standards. The magnitude and long-term stability of the composite impedance of the electrode-tissue system is found to be greatly dependent on the type of electrodes used.

Keywords

Biomedical electrodes; Biomedical imaging; Conductivity; Contacts; Electrocardiography; Electroencephalography; Impedance; Skin; Tomography; Voltage measurement; Contact impedance; Electrophysiology; Tomography; Computer Simulation; Electric Conductivity; Electrodes; Equipment Design; Equipment Failure Analysis; Humans; Models, Biological; Plethysmography, Impedance;

fLanguage

English

Publisher

ieee

Conference_Titel

Engineering in Medicine and Biology Society, 2008. EMBS 2008. 30th Annual International Conference of the IEEE

Conference_Location

Vancouver, BC

ISSN

1557-170X

Print_ISBN

978-1-4244-1814-5

Electronic_ISBN

1557-170X

Type

conf

DOI

10.1109/IEMBS.2008.4649370

Filename

4649370