Finite Element Models Related To Widebrand Tympanometry In Newborns

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Finite-element Models Related to Widebrand Tympanometry in Newborns

Author : Hamid Motallebzadeh
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (973 download)

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Book Synopsis Finite-element Models Related to Widebrand Tympanometry in Newborns by : Hamid Motallebzadeh

Download or read book Finite-element Models Related to Widebrand Tympanometry in Newborns written by Hamid Motallebzadeh and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Early detection of hearing loss accompanied by appropriate early intervention is important in order to avoid problems associated with delayed language development, with its impact on daily communication, educational achievement, psychosocial development and later employment opportunities. Current screening methods are associated with high false-positive rates, which can be attributed to transient conditions in the external ear and middle ear in the first 48 hours post partum. Tympanometry (input acoustic admittance measurement in the presence of a range of static pressures) is a promising tool for evaluating the status of the middle ear in newborns.Tympanometry involves both non-linear responses and viscoelastic (time-dependent) effects, and the tympanic membrane contributes to the overall response more than other middle-ear components do. We have therefore developed a non-linear viscoelastic model based on experimental data reported in the literature for excised strips of tympanic membrane. The constitutive equation of this model is a convolution integral, composed of the Ogden hyperelastic model and the exponential time-dependent function of the Prony series. The model was validated by reproducing the measured hysteresis effect with a single set of parameters. The newborn ear is anatomically very different from the adult one, resulting in a different input admittance than in adults. We have developed a finite-element model to investigate the admittance responses of the ear canal and middle ear in newborns for frequencies up to 2 kHz. The model was validated by comparison with two sets of clinical data and provides quantitative insight into the separate contributions of the outer and middle ear. The results suggest that admittance measurements could provide more information about the condition of the middle-ear if made at multiple frequencies around its resonance (around 1.8 kHz).Wideband stimuli are used to extend admittance measurements to higher frequencies. Taking into account the fluid-structure interaction (FSI) between the air inside the canal and middle-ear cavity and the structure of the ear, we have extended the frequency range of our newborn model up to 10 kHz. The first and second standing-wave modes in the canal were observed at 7.2 and 9.6 kHz, respectively, and the resonance of the middle-ear cavity was identified at 6.1 kHz. The model was validated by comparison with two sets of clinical data and provides interpretations for features that exist in the clinical data but whose significance was not clear.Our numerical models of the non-linear viscoelastic tympanic membrane and of the admittance responses of the newborn ear provide quantitative insight into the mechanics of the ear and establish a groundwork for the clinical application and interpretation of admittance measurements in newborns." --

Non-linear Finite-element Modelling of Newborn Ear Canal and Middle Ear

Author : Li Qi
Publisher :
ISBN 13 :
Total Pages : 133 pages
Book Rating : 4.:/5 (429 download)

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Book Synopsis Non-linear Finite-element Modelling of Newborn Ear Canal and Middle Ear by : Li Qi

Download or read book Non-linear Finite-element Modelling of Newborn Ear Canal and Middle Ear written by Li Qi and published by . This book was released on 2008 with total page 133 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Finite-element Modelling of the Newborn Ear Canal and Middle Ear

Author : Brian Gariepy
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (72 download)

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Book Synopsis Finite-element Modelling of the Newborn Ear Canal and Middle Ear by : Brian Gariepy

Download or read book Finite-element Modelling of the Newborn Ear Canal and Middle Ear written by Brian Gariepy and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Finite-element Modelling of Tympanic-membrane Vibrations Under Quasi-static Pressurization

Author : Sahar Choukir
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (13 download)

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Book Synopsis Finite-element Modelling of Tympanic-membrane Vibrations Under Quasi-static Pressurization by : Sahar Choukir

Download or read book Finite-element Modelling of Tympanic-membrane Vibrations Under Quasi-static Pressurization written by Sahar Choukir and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Early detection of hearing loss is important so it can be addressed in a timely manner. Current newborn hearing screening methods produce high false-positive rates which are attributed to transient conditions in the external and middle ear in the first 48 hours after birth. Tympanometry (acoustical input admittance measurement in the presence of a range of quasi-static pressures) is a promising tool for characterizing middle-ear status in newborns but their response to tympanometry is not well understood. Tympanometry involves large, nonlinear deformations; viscoelastic (time-dependent) effects; and complex dynamic responses. The goal of this study is to combine these three features in a dynamic nonlinear viscoelastic model. The constitutive equation of this model is a convolution integral composed of a Mooney-Rivlin hyperelastic model and an exponential time-dependent Prony series with six time constants. Material properties are taken from previous measurements and estimates. The tympanic membrane contributes to the overall response more than other middle-ear components do and those other components are greatly simplified in this model. The tympanic membrane is assumed to be homogeneous and nearly incompressible. The loading conditions included low-amplitude sound pressures; high quasi-static pressures; and combinations of high quasi-static pressures with low- amplitude sound pressures, corresponding to those involved in tympanometry. Simulations were performed with two different finite-element solvers and we report simulated displacements and vibrations in the frequency and time domains for the different loading conditions. Results from the two finite-element solvers were compared and were similar. The simulation results were compared with measured data from experimental animals. In response to high quasi-static pressures, the model replicates the asymmetrical effects of positive and negative pressures on the displacement; the hysteresis of the displacement; and the frequency dependence of the hysteresis. The model also replicates the differences between the peak-admittance magnitudes and the pressures at which they occur for low-amplitude vibrations during negative and positive sweeps of high quasi-static pressures. Our dynamic nonlinear viscoelastic model of the middle ear permits quantitative insights into the middle ear's response to different loading conditions and will help to establish improved applications of tympanometric measurements in newborns." --

Finite-element Modelling of Middle-ear Vibrations Under Quasi-static Pressurization

Author : Dongfang Qian
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (119 download)

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Book Synopsis Finite-element Modelling of Middle-ear Vibrations Under Quasi-static Pressurization by : Dongfang Qian

Download or read book Finite-element Modelling of Middle-ear Vibrations Under Quasi-static Pressurization written by Dongfang Qian and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Early identification of hearing loss is important because if untreated it can lead to delayed language development and other difficulties. Current tools for newborn hearing screening are subject to excessively high false-positive rates. Tympanometry is a promising tool for improving screening tests by evaluating the condition of the middle ear, but it is poorly understood in newborns. Tympanometry involves large deformations, non-linear responses, viscoelastic (time-dependent) effects, and complex dynamic responses, which make it hard to model. A previous gerbil finite-element model developed in our lab was the first numerical simulation of tympanometry involving the simultaneous application of large quasi-static pressures and small sound pressures, and it succeeded in replicating some features of tympanometry. However, the model involved over-simplified anatomical details of the ossicles to reduce the computational cost. The goal of this study was to improve the model by adding a representation of the incudostapedial joint and its surrounding structures.The model employed a quasi-linear visco-hyperelastic model with several time constants in a Prony series. Material properties were taken from previous models and publications. The tympanic membrane was assumed to be homogeneous and nearly incompressible. The loads, combining high quasi-static pressures with low-amplitude sound pressures, both low-frequency pure tones and wideband chirps, reflected the conditions in tympanometry. The model was verified against our previous models, and validated against data from the literature and our recent laser vibrometry data for the pressurized gerbil middle ear. The model demonstrated experimentally and clinically observed features, including hysteresis and the asymmetry in the vibration amplitude between positive and negative static pressures.This numerical model will help us gain insight into how the middle ear responds to different stimuli and thus open up new approaches to the interpretation of tympanometric measurements"--

Finite Element Simulation of External Ear Sound Fields for the Optimization of Eardrum-related Measurements

Author : Sebastian Schmidt
Publisher : Logos Verlag Berlin GmbH
ISBN 13 : 383252262X
Total Pages : 154 pages
Book Rating : 4.8/5 (325 download)

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Book Synopsis Finite Element Simulation of External Ear Sound Fields for the Optimization of Eardrum-related Measurements by : Sebastian Schmidt

Download or read book Finite Element Simulation of External Ear Sound Fields for the Optimization of Eardrum-related Measurements written by Sebastian Schmidt and published by Logos Verlag Berlin GmbH. This book was released on 2009-08-31 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: The sound pressure pT at the human eardrum has essential advantages as reference signal in audiological and psychoacoustical experiments. Unfortunately, precise pressure measurements very close to the tympanic membrane are difficult. In practice, the microphone has to be positioned at a certain distance from the eardrum. The measured pressure then has to be transformed to the eardrum. As a "classical" approach for the estimation of the necessary transfer function, an acoustical network model of the ear canal is developed from geometrical data of the canal (cross-sectional area function) which is in turn determined from measurements of its acoustical input impedance. Such methods, however, do not provide robust results. In this thesis, the concept of one-dimensional models of the ear canal is examined to find the origin of these errors. For this purpose, the sound field at the human external ear was analyzed using finite element models. Inside the canal, irregular three-dimensional structures occur that cannot be modelled accurately using classical one-dimensional network concepts. Upon these findings, an accurate, efficient and highly feasible method for the estimation of pT was developed. Equal-loudness level contours with reference to the eardrum pressure that were measured as pilot application of the new method are presented.

The Function and Mechanics of Normal, Diseased and Reconstructed Middle Ears

Author : John J. Rosowski
Publisher : Kugler Publications
ISBN 13 : 9789062991815
Total Pages : 428 pages
Book Rating : 4.9/5 (918 download)

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Book Synopsis The Function and Mechanics of Normal, Diseased and Reconstructed Middle Ears by : John J. Rosowski

Download or read book The Function and Mechanics of Normal, Diseased and Reconstructed Middle Ears written by John J. Rosowski and published by Kugler Publications. This book was released on 2000 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Acoustic Immittance Measures

Author : Lisa L. Hunter
Publisher : Plural Publishing
ISBN 13 : 159756639X
Total Pages : 177 pages
Book Rating : 4.5/5 (975 download)

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Book Synopsis Acoustic Immittance Measures by : Lisa L. Hunter

Download or read book Acoustic Immittance Measures written by Lisa L. Hunter and published by Plural Publishing. This book was released on 2013-03-01 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Multibody Dynamics 2019

Author : Andrés Kecskeméthy
Publisher : Springer
ISBN 13 : 3030231321
Total Pages : 545 pages
Book Rating : 4.0/5 (32 download)

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Book Synopsis Multibody Dynamics 2019 by : Andrés Kecskeméthy

Download or read book Multibody Dynamics 2019 written by Andrés Kecskeméthy and published by Springer. This book was released on 2019-06-28 with total page 545 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this work, outstanding, recent developments in various disciplines, such as structural dynamics, multiphysic mechanics, computational mathematics, control theory, biomechanics, and computer science, are merged together in order to provide academicians and professionals with methods and tools for the virtual prototyping of complex mechanical systems. Each chapter of the work represents an important contribution to multibody dynamics, a discipline that plays a central role in the modelling, analysis, simulation and optimization of mechanical systems in a variety of fields and for a wide range of applications.

Comprehensive Handbook of Pediatric Audiology, Second Edition

Author : Anne Marie Tharpe
Publisher : Plural Publishing
ISBN 13 : 1597569542
Total Pages : 1033 pages
Book Rating : 4.5/5 (975 download)

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Book Synopsis Comprehensive Handbook of Pediatric Audiology, Second Edition by : Anne Marie Tharpe

Download or read book Comprehensive Handbook of Pediatric Audiology, Second Edition written by Anne Marie Tharpe and published by Plural Publishing. This book was released on 2016-02-19 with total page 1033 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Comprehensive Handbook of Pediatric Audiology, Second Edition is the most wide-ranging and complete work of its kind, and has become the definitive reference in the specialty area of pediatric audiology. Content areas range from typical auditory development, to identification and diagnostic processes, to medical and audiologic management of childhood hearing and ear disorders. An interdisciplinary assembly of sixty-six internationally recognized experts from the fields of audiology, speech-language pathology, education, pediatric medicine, otology, and hearing science have contributed to this second edition. Building from the success of the first edition, and aligning with the evolution of the profession, this edition expands and deepens its coverage of early identification of hearing loss, etiology and medical considerations, and hearing technologies, especially implantable devices and the measurement of outcomes resulting from intervention. Updates to the new edition include: New chapters on the measurement of outcomes resulting from intervention, preventable hearing loss, implementation of newborn hearing screening programs, and the future of implantable devices, among othersReorganization for improved sequencing of content areaSubstantially updated chapters The Comprehensive Handbook of Pediatric Audiology, Second Edition is intended for use in doctoral-level education programs in audiology or hearing science, as well as to serve as an in-depth reference source for practicing audiologists and other professionals, educators, scientists, and policy makers seeking current and definitive information on evidence-based pediatric audiology practice.

Human Auditory Development

Author : Lynne A. Werner
Publisher : Routledge
ISBN 13 : 042971100X
Total Pages : 292 pages
Book Rating : 4.4/5 (297 download)

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Book Synopsis Human Auditory Development by : Lynne A. Werner

Download or read book Human Auditory Development written by Lynne A. Werner and published by Routledge. This book was released on 2019-03-13 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book overviews auditory development in nonhuman species and proposes a common time frame for human and nonhuman auditory development. It attempts to explain the mechanisms accounting for age-related change in several domains of auditory processing.

Clinical Impedance Audiometry

Author : James Jerger
Publisher : Thieme Medical Publishers
ISBN 13 :
Total Pages : 256 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Clinical Impedance Audiometry by : James Jerger

Download or read book Clinical Impedance Audiometry written by James Jerger and published by Thieme Medical Publishers. This book was released on 1980 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Biomedical Technology and Devices Handbook

Author : George Zouridakis
Publisher : CRC Press
ISBN 13 : 9780849311406
Total Pages : 848 pages
Book Rating : 4.3/5 (114 download)

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Book Synopsis Biomedical Technology and Devices Handbook by : George Zouridakis

Download or read book Biomedical Technology and Devices Handbook written by George Zouridakis and published by CRC Press. This book was released on 2003-08-14 with total page 848 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concise yet comprehensive, the Biomedical Technology and Devices Handbook illuminates the equipment, devices, and techniques used in modern medicine to diagnose, treat, and monitor human illnesses. With topics ranging from the basic procedures like blood pressure measurement to cutting-edge imaging equipment, biological tests, and genetic engineering, this book is organized to navigate smoothly from simple procedures and concepts to the more sophisticated and complex ones. Each section contains a description of the technique, its technical considerations, and its use according to its applications and relevant body systems. The book includes references to relevant Web sites, protocols, problems, and solutions.

Development of Auditory and Vestibular Systems

Author : Raymond Romand
Publisher : Academic Press
ISBN 13 : 0124081088
Total Pages : 563 pages
Book Rating : 4.1/5 (24 download)

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Book Synopsis Development of Auditory and Vestibular Systems by : Raymond Romand

Download or read book Development of Auditory and Vestibular Systems written by Raymond Romand and published by Academic Press. This book was released on 2014-05-23 with total page 563 pages. Available in PDF, EPUB and Kindle. Book excerpt: Development of Auditory and Vestibular Systems fourth edition presents a global and synthetic view of the main aspects of the development of the stato-acoustic system. Unique to this volume is the joint discussion of two sensory systems that, although close at the embryological stage, present divergences during development and later reveal conspicuous functional differences at the adult stage. This work covers the development of auditory receptors up to the central auditory system from several animal models, including humans. Coverage of the vestibular system, spanning amphibians to effects of altered gravity during development in different species, offers examples of the diversity and complexity of life at all levels, from genes through anatomical form and function to, ultimately, behavior. The new edition of Development of Auditory and Vestibular Systems will continue to be an indispensable resource for beginning scientists in this area and experienced researchers alike. Full-color figures illustrate the development of the stato-acoustic system pathway Covers a broad range of species, from drosophila to humans, demonstrating the diversity of morphological development despite similarities in molecular processes involved at the cellular level Discusses a variety of approaches, from genetic-molecular biology to psychophysics, enabling the investigation of ontogenesis and functional development

Constitutive Modelling of Solid Continua

Author : José Merodio
Publisher : Springer Nature
ISBN 13 : 3030315479
Total Pages : 397 pages
Book Rating : 4.0/5 (33 download)

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Book Synopsis Constitutive Modelling of Solid Continua by : José Merodio

Download or read book Constitutive Modelling of Solid Continua written by José Merodio and published by Springer Nature. This book was released on 2019-11-14 with total page 397 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume consists of a collection of chapters by recognized experts to provide a comprehensive fundamental theoretical continuum treatment of constitutive laws used for modelling the mechanical and coupled-field properties of various types of solid materials. It covers the main types of solid material behaviour, including isotropic and anisotropic nonlinear elasticity, implicit theories, viscoelasticity, plasticity, electro- and magneto-mechanical interactions, growth, damage, thermomechanics, poroelasticity, composites and homogenization. The volume provides a general framework for research in a wide range of applications involving the deformation of solid materials. It will be of considerable benefit to both established and early career researchers concerned with fundamental theory in solid mechanics and its applications by collecting diverse material in a single volume. The readership ranges from beginning graduate students to senior researchers in academia and industry.

Assessing Middle Ear Function in Infants

Author : Joseph Kei
Publisher : Plural Publishing
ISBN 13 : 1597566241
Total Pages : 209 pages
Book Rating : 4.5/5 (975 download)

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Book Synopsis Assessing Middle Ear Function in Infants by : Joseph Kei

Download or read book Assessing Middle Ear Function in Infants written by Joseph Kei and published by Plural Publishing. This book was released on 2011-11-01 with total page 209 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Active Middle Ear Implants

Author : Klaus Böheim
Publisher : Karger Medical and Scientific Publishers
ISBN 13 : 3805594704
Total Pages : 95 pages
Book Rating : 4.8/5 (55 download)

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Book Synopsis Active Middle Ear Implants by : Klaus Böheim

Download or read book Active Middle Ear Implants written by Klaus Böheim and published by Karger Medical and Scientific Publishers. This book was released on 2010 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, methods for coupling active implants to the middle ear, round window or combinations of passive middle ear prostheses have progressed considerably. Patient selection criteria have expanded from purely sensorineural hearing losses to conductive and mixed hearing losses in difficult-to-treat ears. This book takes into consideration recently developed methods as well as devices in current use. It begins with a fascinating and authentic history of active middle ear implants, written by one of the main pioneers in the field. In the following chapters, leading scientists and clinicians discuss the relevant topics in otology and audiology. Treatments for sensorineural hearing loss, conductive and mixed hearing losses, and results on alternative coupling sites such as the stapes footplate and the oval window are also covered, as well as articles on candidacy and cost-effectiveness. This publication is a must for ENT professionals and surgeons seeking out the latest knowledge on current research and clinical applications of active middle ear implants for all types of hearing loss.