Title :
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
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;
Conference_Titel :
Engineering in Medicine and Biology Society, 2008. EMBS 2008. 30th Annual International Conference of the IEEE
Conference_Location :
Vancouver, BC
Print_ISBN :
978-1-4244-1814-5
Electronic_ISBN :
1557-170X
DOI :
10.1109/IEMBS.2008.4649370
