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A parametric model for the changes in the complex valued conductivity of a lung during tidal breathing
Department of Physics and Electrical Engineering, Linnæus University, Växjö, Sweden.
Department of Physics and Electrical Engineering, Linnæus University, Växjö, Sweden.
Department of Physics and Electrical Engineering, Linnæus University, Växjö, Sweden.ORCID iD: 0000-0003-2960-3094
Swisstom AG, Landquart, Switzerland.
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2018 (English)In: Journal of Physics D: Applied Physics, ISSN 0022-3727, E-ISSN 1361-6463, Vol. 51, no 20, article id 205401Article in journal (Refereed) Published
Abstract [en]

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 based on realistic parameter values and frequency ranges used with electrical impedance tomography (EIT). The theory may be potentially useful for imaging and clinical evaluations in connection with lung EIT for respiratory management and control.

Place, publisher, year, edition, pages
IOP Publishing , 2018. Vol. 51, no 20, article id 205401
Keywords [en]
homogenization theory, dielectric properties of biological tissue, dielectric properties of lung tissue, electrical impedance tomography
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:oru:diva-72593DOI: 10.1088/1361-6463/aabc04ISI: 000430961300001Scopus ID: 2-s2.0-85047182230OAI: oai:DiVA.org:oru-72593DiVA, id: diva2:1289993
Note

Funding Agencies:

European Union's Horizon research and innovation programme  668259 

Swedish Foundation for Strategic Research (SSF) under the programme Applied Mathematics  

project Complex Analysis and Convex Optimization for EM Design 

Available from: 2019-02-19 Created: 2019-02-19 Last updated: 2019-02-27Bibliographically approved

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Khodadad, Davood

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