A parametric model for the changes in the complex valued conductivity of a lung during tidal breathing

Nordebo, Sven and Dalarsson, Mariana and Khodadad, Davood and Müller, Beat and Waldmann, Andreas D. and Becher, Tobias and Frerichs, Inez and Sophocleous, Louiza and Sjöberg, Daniel and Seifnaraghi, Nima and Bayford, Richard (2018) A parametric model for the changes in the complex valued conductivity of a lung during tidal breathing. Journal of Physics D: Applied Physics, 51 (20). ISSN 0022-3727

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Abstract

Classical homogenization theory based on the Hashin-Shtrikman coated ellipsoids is used to model the changes in the complex valued conductivity (or admittivity) of a lung during tidal breathing. Here, the lung is modeled as a two-phase composite material where the alveolar air-filling corresponds to the inclusion phase. The theory predicts a linear relationship between the real and the imaginary parts of the change in the complex valued conductivity of a lung during tidal breathing, and where the loss cotangent of the change is approximately the same as of the effective background conductivity and hence easy to estimate. The theory is illustrated with numerical examples, as well as by using reconstructed Electrical Impedance Tomography (EIT) images based on clinical data from an ongoing study within the EU-funded CRADL project. The theory may be potentially useful for improving the imaging algorithms and clinical evaluations in connection with lung EIT for respiratory management and monitoring in neonatal intensive care units.

Item Type: Article
Additional Information: Article number = 205401
Research Areas: A. > School of Science and Technology > Natural Sciences > Biophysics and Bioengineering group
Item ID: 24284
Notes on copyright: © 2018 IOP Publishing Ltd. This Accepted Manuscript is available for reuse under a CC BY-NC-ND 3.0 licence (https://creativecommons.org/licenses/by-nc-nd/3.0/) after the 12 month embargo period provided that all the terms of the licence are adhered to. The Version of Record is available online at : https://doi.org/10.1088/1361-6463/aabc04
Useful Links:
Depositing User: Richard Bayford
Date Deposited: 22 May 2018 09:19
Last Modified: 12 Dec 2018 11:51
URI: http://eprints.mdx.ac.uk/id/eprint/24284

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