Analytic Intermodel Consistent Modeling Of Volumetric Human Lung Dynamics

Keywords

flow-structure interaction (FSI); fusion algorithm; lung displacement; poro-elastic medium; Tikhonov regularization

Abstract

Human lung undergoes breathing-induced deformation in the form of inhalation and exhalation. Modeling the dynamics is numerically complicated by the lack of information on lung elastic behavior and fluid-structure interactions between air and the tissue. A mathematical method is developed to integrate deformation results from a deformable image registration (DIR) and physics-based modeling approaches in order to represent consistent volumetric lung dynamics. The computational fluid dynamics (CFD) simulation assumes the lung is a poro-elastic medium with spatially distributed elastic property. Simulation is performed on a 3D lung geometry reconstructed from four-dimensional computed tomography (4DCT) dataset of a human subject. The heterogeneous Young's modulus (YM) is estimated from a linear elastic deformation model with the same lung geometry and 4D lung DIR. The deformation obtained from the CFD is then coupled with the displacement obtained from the 4D lung DIR by means of the Tikhonov regularization (TR) algorithm. The numerical results include 4DCT registration, CFD, and optimal displacement data which collectively provide consistent estimate of the volumetric lung dynamics. The fusion method is validated by comparing the optimal displacement with the results obtained from the 4DCT registration.

Publication Date

10-1-2015

Publication Title

Journal of Biomechanical Engineering

Volume

137

Issue

10

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1115/1.4031349

Socpus ID

84941138178 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84941138178

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