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Towards an accurate bioimpedance identification
Sánchez Terrones, Benjamín; Louarroudi, E.; Bragós Bardia, Ramon; Pintelon, Rik
Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica; Universitat Politècnica de Catalunya. IEB - Instrumentació Electrònica i Biomèdica
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 cross 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 cross 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.
Àrees temàtiques de la UPC::Enginyeria biomèdica::Electrònica biomèdica
Biomedical & nanomedical technologies
Spectrum analysis.
Electric impedance tomography
Electric impedance
Frequency response
Spectrum analysis
Biometria -- Aparells i instruments
Attribution-NonCommercial-NoDerivs 3.0 Spain

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