An image-based computational model of oscillatory flow in the proximal part of tracheobronchial trees

A computational model of an oscillatory laminar flow of an incompressible Newtonian fluid has been carried out in the proximal part of human tracheobronchial trees, either normal or with a strongly stenosed right main bronchus. After acquisition with a multislice spiral CT, the thoracic images are p...

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Bibliographic Details
Published in:Computer methods in biomechanics and biomedical engineering 2005-08, Vol.8 (4), p.279-293
Main Authors: Fetita, C., Mancini, S., Perchet, D., Prêteux, F., Thiriet, M., Vial, L.
Format: Article
Language:English
Subjects:
3D reconstruction
Analysis of PDEs
Bronchi - anatomy & histology
Bronchi - physiology
Bronchoscopy
Computed tomography
Computer Simulation
Flow distribution
Humans
Mathematics
Models, Anatomic
Models, Biological
Oscillatory flow
Pulmonary Valve Stenosis - pathology
Pulmonary Valve Stenosis - physiopathology
Radiographic Image Interpretation, Computer-Assisted
Respiratory Mechanics
Tomography, Spiral Computed
Trachea - anatomy & histology
Trachea - diagnostic imaging
Trachea - physiology
Tracheobronchial tree
User-Computer Interface
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Summary:A computational model of an oscillatory laminar flow of an incompressible Newtonian fluid has been carried out in the proximal part of human tracheobronchial trees, either normal or with a strongly stenosed right main bronchus. After acquisition with a multislice spiral CT, the thoracic images are processed to reconstruct the geometry of the trachea and the first six bronchus generations and to virtually travel inside this duct network. The facetisation associated with the 3D reconstruction of the tracheobronchial tree is improved to get a computation-adapted surface triangulation, which leads to a volumic mesh composed of tetrahedra. The Navier-Stokes equations associated with the classical boundary conditions and different values of the flow dimensionless parameters are solved using the finite element method. The airways are supposed to be rigid during rest breathing. The flow distribution among the set of bronchi is determined during the respiratory cycle. Cycle reproducibility and mesh size effects on the numerical results are examined. Helpful qualitative data are provided rather than accurate quantitative results in the context of multimodelling, from image processing to numerical simulations.
ISSN:1025-5842
1476-8259
DOI:10.1080/10255840500289624