Ontology type: schema:ScholarlyArticle Open Access: True
2016-02-06
AUTHORSGuangzhi Zhang, Xian Chen, Junji Ohgi, Toshiro Miura, Akira Nakamoto, Chikanori Matsumura, Seiryo Sugiura, Toshiaki Hisada
ABSTRACTBACKGROUND: The biomechanical simulation of the human respiratory system is expected to be a useful tool for the diagnosis and treatment of respiratory diseases. Because the deformation of the thorax significantly influences airflow in the lungs, we focused on simulating the thorax deformation by introducing contraction of the intercostal muscles and diaphragm, which are the main muscles responsible for the thorax deformation during breathing. METHODS: We constructed a finite element model of the thorax, including the rib cage, intercostal muscles, and diaphragm. To reproduce the muscle contractions, we introduced the Hill-type transversely isotropic hyperelastic continuum skeletal muscle model, which allows the intercostal muscles and diaphragm to contract along the direction of the fibres with clinically measurable muscle activation and active force-length relationship. The anatomical fibre orientations of the intercostal muscles and diaphragm were introduced. RESULTS: Thorax deformation consists of movements of the ribs and diaphragm. By activating muscles, we were able to reproduce the pump-handle and bucket-handle motions for the ribs and the clinically observed motion for the diaphragm. In order to confirm the effectiveness of this approach, we simulated the thorax deformation during normal quiet breathing and compared the results with four-dimensional computed tomography (4D-CT) images for verification. CONCLUSIONS: Thorax deformation can be simulated by modelling the respiratory muscles according to continuum mechanics and by introducing muscle contractions. The reproduction of representative motions of the ribs and diaphragm and the comparison of the thorax deformations during normal quiet breathing with 4D-CT images demonstrated the effectiveness of the proposed approach. This work may provide a platform for establishing a computational mechanics model of the human respiratory system. More... »
PAGES18
http://scigraph.springernature.com/pub.10.1186/s12938-016-0132-y
DOIhttp://dx.doi.org/10.1186/s12938-016-0132-y
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PUBMEDhttps://www.ncbi.nlm.nih.gov/pubmed/26852020
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