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. 2010:2010:630649.
doi: 10.1155/2010/630649. Epub 2010 Feb 2.

Improvement of EEG signal acquisition: an electrical aspect for state of the art of front end

Ali Bulent Usakli  1
Affiliations

Improvement of EEG signal acquisition: an electrical aspect for state of the art of front end

Ali Bulent Usakli. Comput Intell Neurosci. 2010.

Abstract

The aim of this study is to present some practical state-of-the-art considerations in acquiring satisfactory signals for electroencephalographic signal acquisition. These considerations are important for users and system designers. Especially choosing correct electrode and design strategy of the initial electronic circuitry front end plays an important role in improving the system's measurement performance. Considering the pitfalls in the design of biopotential measurement system and recording session conditions creates better accuracy. In electroencephalogram (EEG) recording electrodes, system electronics including filtering, amplifying, signal conversion, data storing, and environmental conditions affect the recording performance. In this paper, EEG electrode principles and main points of electronic noise reduction methods in EEG signal acquisition front end are discussed, and some suggestions for improving signal acquisition are presented.

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Figures

Figure 1
Figure 1
Biopotential measurement via electrodes.
Figure 2
Figure 2
Simplified equivalent circuit of biopotential source and electrode-tissue interface from electrode. Biopotential source as a current source and tissue resistance is shown Rt. Cet and Ret electrode-tissue equivalent elements may change for each electrode contact.
Figure 3
Figure 3
Commercially available EEG electrodes and cap samples; (c) is for invasive applications.
Figure 4
Figure 4
A dry electrode principle.
Figure 5
Figure 5
EEG electrode connections.
Figure 6
Figure 6
Electromagnetic interference (EMI) ways (for the capacitance values [9]). Arrows show the interference currents. (I) Voltage due to magnetic field to electrode cable loop is illustrated. (II) Displacement current on subject head due to electrical field causes voltage drop across electrodes. (III) Displacement current on subject body due to electrical field causes voltage drop across electrodes. (IV) Additionally, this current causes voltage between measurement electrode and amplifier common pin [24].
Figure 7
Figure 7
Suggested input amplifier circuit.
See this image and copyright information in PMC

References

    1. Sinclair CM, Gasper MC, Blum AS. Basic electronics in clinical neurophysiology. In: Blum AS, Rutkove SB, editors. The Clinical Neurophysiology Primer. Totowa, NJ, USA: Humana Press; 2007. pp. 3–18.
    1. Prutchi D, Norris M. Design and Develeopment of Medical Electronic Instrumentation. Hoboken, NJ, USA: John Wiley & Sons; 2005.
    1. Leach M., Jr. Fundamentals of low-noise analog circuit design. Proceedings of the IEEE. 1994;82(10):1515–1538.
    1. Ott HW. Noise Reduction Techniques in Electronic Systems. 2nd edition. New York, NY, USA: John Wiley & Sons; 1988.
    1. Jasper HH. The ten–twenty electrode system of the international federation. Electroencephalography and Clinical Neurophysiology. 1958;10:367–380. - PubMed

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