Mathematical Modelling of Particle Transport and Deposition in the Acinar Region of the Lung PDF Download
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Author: Pierre-Antoine Muller
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
The context of this thesis is the modelling of particle deposition in the human lung in order to optimise the administration of inhaled drugs. As the alveolar region plays a crucial role both physiologically and functionally, especially for systemic delivery, the objective of this work is to set-up a particle deposition model specific to the acinar region which could be integrated in whole lung deposition model. The first two chapters concentrate on the anatomical and functional aspects of the lung and on the physical principles involved in the flow and particle transport mechanisms in the lung. Then a computational fluid dynamics model was setup in a simplified alveolar geometry. Aerosol bolus transport was studied through an Eulerian approach, for one or several breathing cycles. The impact of flow irreversibilities on bolus dispersion was quantified. The last chapter deals with the integration of the previous results in an analytical model of particle deposition in the whole lung. The results generated by this model are then compared to experimental data from the literature or obtained from an ongoing clinical trial. The results of the new theoretical model show an increase of particle deposition in the acinar region which improves correlation of theory with experimental data. This model could favourably help designing therapies targeting the alveolar region of the lung.
Author: Pierre-Antoine Muller
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
The context of this thesis is the modelling of particle deposition in the human lung in order to optimise the administration of inhaled drugs. As the alveolar region plays a crucial role both physiologically and functionally, especially for systemic delivery, the objective of this work is to set-up a particle deposition model specific to the acinar region which could be integrated in whole lung deposition model. The first two chapters concentrate on the anatomical and functional aspects of the lung and on the physical principles involved in the flow and particle transport mechanisms in the lung. Then a computational fluid dynamics model was setup in a simplified alveolar geometry. Aerosol bolus transport was studied through an Eulerian approach, for one or several breathing cycles. The impact of flow irreversibilities on bolus dispersion was quantified. The last chapter deals with the integration of the previous results in an analytical model of particle deposition in the whole lung. The results generated by this model are then compared to experimental data from the literature or obtained from an ongoing clinical trial. The results of the new theoretical model show an increase of particle deposition in the acinar region which improves correlation of theory with experimental data. This model could favourably help designing therapies targeting the alveolar region of the lung.
Author: Haribalan Kumar
Publisher:
ISBN:
Category : Lungs
Languages : en
Pages : 158
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Book Description
In this work, airflow and particle transport are studied using mathematical and image-based models of pulmonary acinus. Numerical results predict that airflow in the presence of wall motion in a three-dimensional honey-comb like geometry is characterized by the presence of a recirculation region within the alveolar cavity and a weak entraining flow between alveolar duct and cavity. Alveolar flow in distal generations is characterized by higher alveolar flow rates, larger entrainment of ductal flow and absence of recirculatory flow inside alveoli. The study of transport constitutes assessment of mixing visualized by the tracking of massless particles and the study of transport and deposition of aerosols. The phenomenon of steady streaming is found to hold the key to the origin of kinematic mixing in the alveolus, the alveolar mouth and the alveolated duct. This mechanism provides the explanation for observed folding of material lines and increases in material surface area, and has no bearing on whether the geometry is expanding or if flow separates within the cavity or not. Streaming results in non-zero drift of particles between the beginning and end of a breathing cycle. Based on flow conditions and resultant convective mixing measures, we conclude that significant convective mixing in the duct and within an alveolus could originate only in the first few generations of the acinar tree as a result of non-zero inertia, flow asymmetry and large KC number. Evidence of streaming and related Lagrangian drift is also observed in image-based acinar models. Finally, particle deposition calculations are performed on the models of pulmonary acinus considered in this study.
Author: Seong Suk Park
Publisher:
ISBN:
Category :
Languages : en
Pages : 282
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Book Description
Author: Josué Sznitman
Publisher: Sudwestdeutscher Verlag Fur Hochschulschriften AG
ISBN: 9783838106847
Category :
Languages : de
Pages : 248
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Book Description
The pulmonary acinus, known as the gas exchange region of the lung, encompasses the complex of millions of sub-millimeter alveoli and may represent a potential host for pulmonary complications and diseases. These health disorders may require the inhalation of therapeutic drugs typically administered in the form of aerosolized particles. Both a precise understanding of the mechanisms leading to particle deposition as well as the need to target aerosols to specific pulmonary sites, remain ongoing challenges and depend directly on the fluid dynamics in the lung, and specifically on the microflows present in the acinar region. These considerations call not only for a deepening of our understanding of the fluid mechanics pertinent to the acinar region of the lung, but also, for the potential development of novel strategies towards improved and enhanced particle deposition inside the lung. The present thesis, which lies at the interface between engineering and medicine, is concerned with the role of convective respiratory flows in the acinar region of the lung, in conjunction with the transport and deposition of inhaled particles.
Author: Ewald R. Weibel
Publisher: Academic Press
ISBN: 1483225798
Category : Computers
Languages : en
Pages : 164
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Book Description
Morphometry of the Human Lung considers the developments in understanding the quantitative anatomy of the lung, and in the correlation of anatomy with physiology. This book is composed of 11 chapters, and begins with an overview of a systematic approach to a quantitative morphologic analysis of the architecture of the human lung, followed by a presentation of general problems of methodology and the derivation of reliable dimensional models of this organ. The subsequent chapters describe the methods of preparation of tissues, methods of random sampling, and adaptation of methodologies from other fields of science. These topics are followed by discussions the mathematical formulations for the translation of the data into the desired geometric forms and a technique of counting. The final chapters look into the mode of distribution and geometric forms that should eventually facilitate mathematical and physical considerations regarding the function of the lungs. These chapters also consider the application of these quantitative methods to the study of pathologic specimens, providing a most timely renovation of morphologic pathology. This book will be of value to pulmonologists, physiologists, and researchers who are interested in lung morphometry.
Author: Harry Salem
Publisher: Royal Society of Chemistry
ISBN: 1849735948
Category : Medical
Languages : en
Pages : 518
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Book Description
This book focusses on the toxicological aspects of aerobiology, considering the adverse health effects associated with the inhalation of airborne biological particulates.
Author: Jiyuan Tu
Publisher: Springer Science & Business Media
ISBN: 9400744870
Category : Technology & Engineering
Languages : en
Pages : 383
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Book Description
Traditional research methodologies in the human respiratory system have always been challenging due to their invasive nature. Recent advances in medical imaging and computational fluid dynamics (CFD) have accelerated this research. This book compiles and details recent advances in the modelling of the respiratory system for researchers, engineers, scientists, and health practitioners. It breaks down the complexities of this field and provides both students and scientists with an introduction and starting point to the physiology of the respiratory system, fluid dynamics and advanced CFD modeling tools. In addition to a brief introduction to the physics of the respiratory system and an overview of computational methods, the book contains best-practice guidelines for establishing high-quality computational models and simulations. Inspiration for new simulations can be gained through innovative case studies as well as hands-on practice using pre-made computational code. Last but not least, students and researchers are presented the latest biomedical research activities, and the computational visualizations will enhance their understanding of physiological functions of the respiratory system.
Author: Jason H. T. Bates
Publisher: Cambridge University Press
ISBN: 0521509602
Category : Medical
Languages : en
Pages : 237
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Book Description
A modern quantitative study of lung mechanics, relating mathematical modeling and engineering principles to lung function, structure, mechanics, and disease.
Author: I. Horvath
Publisher: European Respiratory Society
ISBN: 1849840059
Category : Medical
Languages : en
Pages : 261
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Book Description
Exhaled air contains numerous substances, often in extremely low concentrations. The development of sensitive detection techniques has made it possible to examine the composition of exhaled air in relation to a variety of airway diseases and other disorders. In this book, an overview of current cutting-edge breath analysis techniques and their clinical applications is provided for the clinician. The various contributions give a fascinating perspective of a future where new, highly sensitive methodologies will enable clinicians to diagnose and monitor a wide variety of diseases merely by taking.
Author: ICRP,
Publisher: SAGE Publications Limited
ISBN: 9781473944404
Category : Science
Languages : en
Pages : 0
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