Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/4107
Título: Modeling of the lung impedance using a fractional order ladder network with constant phase elements
Autor: Ionescu, Clara M.
Machado, J. A. Tenreiro
Keyser, Robin De
Palavras-chave: Constant phase element (CPE)
Forced oscillations
Fractal structure
Frequency response
Ladder network
Respiratory impedance
Data: 2011
Editora: IEEE
Relatório da Série N.º: IEEE Transactions on Biomedical Circuits and Systems; Vol. 5, Issue 1
Resumo: The self similar branching arrangement of the airways makes the respiratory system an ideal candidate for the application of fractional calculus theory. The fractal geometry is typically characterized by a recurrent structure. This study investigates the identification of a model for the respiratory tree by means of its electrical equivalent based on intrinsic morphology. Measurements were obtained from seven volunteers, in terms of their respiratory impedance by means of its complex representation for frequencies below 5 Hz. A parametric modeling is then applied to the complex valued data points. Since at low-frequency range the inertance is negligible, each airway branch is modeled by using gamma cell resistance and capacitance, the latter having a fractional-order constant phase element (CPE), which is identified from measurements. In addition, the complex impedance is also approximated by means of a model consisting of a lumped series resistance and a lumped fractional-order capacitance. The results reveal that both models characterize the data well, whereas the averaged CPE values are supraunitary and subunitary for the ladder network and the lumped model, respectively.
Peer review: yes
URI: http://hdl.handle.net/10400.22/4107
ISSN: 1932-4545
Versão do Editor: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5611628
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