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Waveform selection for electrical impedance tomography

Corazza, M. F., Beltrachini, Leandro, von Ellenrieder, N. and Muravchik, C. H. 2013. Waveform selection for electrical impedance tomography. IEEE Latin America Transactions 11 (1) , pp. 402-407. 10.1109/TLA.2013.6502837

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Electrical Impedance Tomography (EIT) is a noninvasive method that can be used to estimate the electrical conductivity of the head tissues. It is based on the measurement of electric potential on the scalp generated by the injection of a small electric current. If the generated electric potential distribution is measured with an Electroencephalography (EEG) equipment, the neural activity of the brain will produce signals that may affect the EIT measurements. In the present work we propose a method to reduce the effect of these signals and show a procedure to obtain the minimum number of samples that is needed to neglect the effect of the brain activity. The method requires the obtention of the optimum waveform for the applied current to minimize the variance of the electric potential estimation. As an example, the method is applied to two sets of EEG measurements of two patients, and we determine the optimum waveform and minimum number of samples for each measurement set. We also show that the replacement of the optimum waveform by a sinusoid with arbitrary phase does not significantly affect the estimations, but a previous spectral analysis of the brain activity must be performed in order to determine convenient frequencies.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Cardiff University Brain Research Imaging Centre (CUBRIC)
Subjects: Q Science > QC Physics
Uncontrolled Keywords: waveform estimation, Electrical Impedance Tomography (EIT), electroencephalography (EEG), number of samples
Language other than English: Spanish
Publisher: IEEE
ISSN: 1548-0992
Last Modified: 08 May 2019 13:48

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