Scalp electrode impedance, infection risk, and EEG data quality
Scalp electrode impedance, infection risk, and EEG data quality
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DOI：
10.1016/s1388-2457(00)00533-2
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发表时间：
2001-03-01
影响因子：
4.7
通讯作者：
Tucker, DM
中科院分区：
文献类型：
--
作者：
Ferree, TC;Luu, P;Tucker, DM
目的：当使用头皮脑电图（EEG）电极时，皮肤会破裂，这会增加血液传播病原体感染的风险，如HIV、丙型肝炎和克雅氏病。现代工程原理表明，高头皮阻抗（约40 k欧姆）可以在不磨损头皮的情况下收集到优秀的脑电图信号。本研究旨在评估电极-头皮阻抗对脑电图数据质量的影响。方法：本文第一部分回顾了现代高输入阻抗差分放大器和受试者隔离的电生理记录，并解释了头皮-电极阻抗如何影响脑电图信号幅度和电源线噪声。论文的第二部分介绍了EEG数据质量作为EEG和事件相关电位（ERP）记录的标准频段和60 Hz噪声的头皮-电极阻抗函数的实验研究。结果：当头皮-电极阻抗从小于10 k欧姆（擦伤皮肤）增加到40 k欧姆（完整皮肤）时，脑电各频段振幅均无明显变化。60 Hz几乎与阻抗失配无关，这表明电容耦合噪声在失配电极阻抗上出现差异，对观察到的60 Hz噪声水平没有实质性贡献。结论：采用现代高输入阻抗放大器和精确的电力线噪声数字滤波器，可以在不磨损皮肤的情况下记录高质量的脑电图。(C) 2001爱思唯尔科学爱尔兰有限公司版权所有
Objectives: Breaking the skin when applying scalp electroencephalographic (EEG) electrodes creates the risk of infection from blood-born pathogens such as HIV, Hepatitis-C, and Creutzfeldt-Jacob Disease. Modern engineering principles suggest that excellent EEG signals can be collected with high scalp impedance (approximate to 40 k Ohm) without scalp abrasion. The present study was designed to evaluate the effect of electrode-scalp impedance on EEG data quality.Methods: The first section of the paper reviews electrophysiological recording with modern high input-impedance differential amplifiers and subject isolation, and explains how scalp-electrode impedance influences EEG signal amplitude and power line noise. The second section of the paper presents an experimental study of EEG data quality as a function of scalp-electrode impedance for the standard frequency bands in EEG and event-related potential (ERP) recordings and for 60 Hz noise.Results: There was no significant amplitude change in any EEG frequency bands as scalp-electrode impedance increased from less than 10 k Ohm (abraded skin) to 40 k Ohm (intact skin). 60 Hz was nearly independent of impedance mismatch, suggesting that capacitively coupled noise appearing differentially across mismatched electrode impedances did not contribute substantially to the observed 60 Hz noise levels.Conclusions: With modern high input-impedance amplifiers and accurate digital filters for power line noise, high-quality EEG can be recorded without skin abrasion. (C) 2001 Elsevier Science Ireland Ltd, All rights reserved.