Electrode contact impedance sensitivity to variations in geometry

被引：38

作者：

Cardu, Roberto ^{[1
]}

Leong, Philip H. W. ^{[2
]}

Jin, Craig T. ^{[2
]}

McEwan, Alistair ^{[2
]}

机构：

[1] Univ Bologna, ARCES, I-40126 Bologna, Italy

[2] Univ Sydney, Sydney, NSW 2006, Australia

来源：

PHYSIOLOGICAL MEASUREMENT | 2012年 / 33卷 / 05期

关键词：

contact impedance; bio-potential recordings; EIT; EEG; spiked electrodes; SKIN IMPEDANCE; INTERFERENCE; TOMOGRAPHY; ERRORS; DRY;

D O I：

10.1088/0967-3334/33/5/817

中图分类号：

Q6 [生物物理学];

学科分类号：

071011 ;

摘要：

Electrode contact impedance is a crucial factor in physiological measurements and can be an accuracy-limiting factor when performing electroencephalography and electrical impedance tomography. In this work, standard flat electrodes and micromachined multipoint spiked electrodes are characterized with a finite-element method electromagnetic solver and the dependence of the contact impedance on geometrical factors is explored. It is found that flat electrodes are sensitive to changes in the outer skin layer properties related to hydration and thickness, while spike electrodes are not. The impedance as a function of the effective contact area, number of spikes and penetration depth has also been studied and characterized.

引用

页码：817 / 830

页数：14

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