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Effect of upper airway on tracheobronchial fluid dynamics
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Kim, Minsuok, Collier, Guilhem J., Wild, Jim M. and Chung, Yongmann M. (2018) Effect of upper airway on tracheobronchial fluid dynamics. International Journal for Numerical Methods in Biomedical Engineering , 34 (9). e3112. doi:10.1002/cnm.3112 ISSN 2040-7939.
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WRAP-effect-upper-airway-tracheobronchial-fluid-dynamics-Chung-2018.pdf - Accepted Version - Requires a PDF viewer. Download (1310Kb) | Preview |
Official URL: http://dx.doi.org/10.1002/cnm.3112
Abstract
The upper airways play a significant role in the tracheal flow dynamics. Despite many previous studies, however, the effect of the upper airways on the ventilation distribution in distal airways has remained a challenge. The aim of this study is to experimentally and computationally investigate the dynamic behaviour in the intratracheal flow induced by the upper respiratory tract and to assess its influence on the subsequent tributaries. Patient‐specific images from 2 different modalities (magnetic resonance imaging of the upper airways and computed tomography of the lower airways) were segmented and combined. An experimental phantom of patient‐specific airways (including the oral cavity, larynx, trachea, down to generations 6‐8) was generated using 3D printing. The flow velocities in this phantom model were measured by the flow‐sensitised phase contrast magnetic resonance imaging technique and compared with the computational fluid dynamics simulations. Both experimental and computational results show a good agreement in the time‐averaged velocity fields as well as fluctuating velocity. The flows in the proximal trachea were complex and unsteady under both lower‐ and higher‐flow rate conditions. Computational fluid dynamics simulations were also performed with an airways model without the upper airways. Although the flow near the carina remained unstable only when the inflow rate was high, the influence of the upper airways caused notable changes in distal flow distributions when the 2 airways models were compared with and without the upper airways. The results suggest that the influence of the upper airways should be included in the respiratory flow assessment as the upper airways extensively affect the flows in distal airways and consequent ventilation distribution in the lungs.
Item Type: | Journal Article | |||||||||||||||
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Subjects: | R Medicine > RC Internal medicine T Technology > TA Engineering (General). Civil engineering (General) |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | |||||||||||||||
Library of Congress Subject Headings (LCSH): | Airway (Medicine) -- Imaging, Computational fluid dynamics, Trachea, Three-dimensional printing, Fluid dynamic measurements, Phase contrast magnetic resonance imaging, Airway (Medicine) -- Models | |||||||||||||||
Journal or Publication Title: | International Journal for Numerical Methods in Biomedical Engineering | |||||||||||||||
Publisher: | John Wiley & Sons Ltd. | |||||||||||||||
ISSN: | 2040-7939 | |||||||||||||||
Official Date: | September 2018 | |||||||||||||||
Dates: |
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Volume: | 34 | |||||||||||||||
Number: | 9 | |||||||||||||||
Article Number: | e3112 | |||||||||||||||
DOI: | 10.1002/cnm.3112 | |||||||||||||||
Status: | Peer Reviewed | |||||||||||||||
Publication Status: | Published | |||||||||||||||
Reuse Statement (publisher, data, author rights): | This is the pre-peer reviewed version of the following article: Kim M, Collier GJ, Wild JM, Chung YM. Effect of upper airway on tracheobronchial fluid dynamics. Int J Numer Meth Biomed Engng. 2018;e3112. https://doi.org/10.1002/cnm.3112, which has been published in final form at https://doi.org/10.1002/cnm.3112. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. | |||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||
Date of first compliant deposit: | 10 August 2018 | |||||||||||||||
Date of first compliant Open Access: | 1 June 2019 | |||||||||||||||
RIOXX Funder/Project Grant: |
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