Title:
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Towards an accurate bioimpedance identification
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Author:
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Sánchez Terrones, BenjamÃn; Louarroudi, E.; Bragós Bardia, Ramon; Pintelon, Rik
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Other authors:
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Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica; Universitat Politècnica de Catalunya. IEB - Instrumentació Electrònica i Biomèdica |
Abstract:
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This paper describes the local polynomial method (LPM) for estimating the time-
invariant bioimpedance frequency response function (FRF) considering both the output-error (OE) and the errors-in-variables (EIV) identi cation framework and compare it with the traditional crossð€€€ and autocorrelation spectral analysis techniques. The bioimpedance FRF is measured with the multisine electrical impedance spectroscopy (EIS) technique. To show
the overwhelming accuracy of the LPM approach, both the LPM and the classical crossð€€€ and autocorrelation spectral analysis technique are evaluated through the same experimental data coming from a nonsteady-state measurement of time-varying in vivo myocardial tissue. The estimated error sources at the measurement frequencies due to noise, n Z, and the stochastic
nonlinear distortions, NL Z , have been converted to and plotted over the bioimpedance spectrum for each framework. Ultimately, the impedance spectra have been tted to a Cole impedance model using both an unweighted and a weighted complex nonlinear least square (CNLS) algorithm. A table is provided with the relative standard errors on the estimated parameters to reveal the importance of which system identi cation frameworks should be used. |
Subject(s):
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-Àrees temà tiques de la UPC::Enginyeria biomèdica::Electrònica biomèdica -Biomedical & nanomedical technologies -Spectrum analysis. -Electric impedance tomography -Autocorrelation -Electric impedance -Frequency response -Spectrum analysis -Tissue -Biometria -- Aparells i instruments -Espectroscopis |
Rights:
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Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
Document type:
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Article - Published version Conference Object |
Published by:
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IOPScience
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