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Author : Li Qi
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (429 download)
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 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Hamid Motallebzadeh
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (973 download)
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." --
Author : Brian Gariepy
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (72 download)
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:
Author : Joseph Kei
Publisher : Plural Publishing
ISBN 13 : 1597566241
Total Pages : 209 pages
Book Rating : 4.5/5 (975 download)
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:
Author : Sahar Choukir
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (13 download)
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." --
Author : Dongfang Qian
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (119 download)
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"--
Author : Sebastian Schmidt
Publisher : Logos Verlag Berlin GmbH
ISBN 13 : 383252262X
Total Pages : 154 pages
Book Rating : 4.8/5 (325 download)
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.
Author : Sunil Puria
Publisher : Springer Science & Business Media
ISBN 13 : 1461465915
Total Pages : 320 pages
Book Rating : 4.4/5 (614 download)
Download or read book The Middle Ear written by Sunil Puria and published by Springer Science & Business Media. This book was released on 2013-03-19 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: The middle ear plays a vital role in the sense and sensitivity of hearing. Of the various characteristics that distinguish mammals from other vertebrates, several pertain specifically to the middle-ear system, such as the presence of three middle-ear bones and the four-layer composite structure of the tympanic membrane. The Middle Ear attempts to elucidate the role this system plays in sound transmission, as viewed from both scientific and clinical perspectives.
Author : Lynne Werner
Publisher : Springer Science & Business Media
ISBN 13 : 1461414202
Total Pages : 294 pages
Book Rating : 4.4/5 (614 download)
Download or read book Human Auditory Development written by Lynne Werner and published by Springer Science & Business Media. This book was released on 2011-12-14 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume will provide an important contemporary reference on hearing development and will lead to new ways of thinking about hearing in children and about remediation for children with hearing loss. Much of the material in this volume will document that a different model of hearing is needed to understand hearing during development. The book is expected to spur research in auditory development and in its application to pediatric audiology.
Author : Bopanna Ballachanda
Publisher : Plural Publishing
ISBN 13 : 1597566373
Total Pages : 240 pages
Book Rating : 4.5/5 (975 download)
Download or read book The Human Ear Canal written by Bopanna Ballachanda and published by Plural Publishing. This book was released on 2013-03-01 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Acoustical Society of America
Publisher :
ISBN 13 :
Total Pages : 988 pages
Book Rating : 4.F/5 ( download)
Download or read book The Journal of the Acoustical Society of America written by Acoustical Society of America and published by . This book was released on 2006 with total page 988 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Lisa L. Hunter
Publisher : Plural Publishing
ISBN 13 : 159756639X
Total Pages : 177 pages
Book Rating : 4.5/5 (975 download)
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:
Author : Paul Fuchs
Publisher : OUP Oxford
ISBN 13 : 019923339X
Total Pages : 462 pages
Book Rating : 4.1/5 (992 download)
Download or read book Oxford Handbook of Auditory Science: The Ear written by Paul Fuchs and published by OUP Oxford. This book was released on 2010-01-14 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first volume in The Oxford Handbook of Auditory Science, The Ear serves both as an introduction and as a reference work for anyone interested in how 'hearing' happens. It will be a valuable resource, for anyone interested in the ongoing challenge, and adventure, of understanding the mysteries of the ear.
Author : Jennifer L. Day
Publisher :
ISBN 13 :
Total Pages : 202 pages
Book Rating : 4.:/5 (616 download)
Download or read book Finite-element Modelling of the Fluid-structure Interaction Between the Ear Canal and Eardrum written by Jennifer L. Day and published by . This book was released on 1990 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: "In this work mathematical modelling methods are formulated in order to examine how sound pressures in the ear canal interact with displacements on the eardrum. Existing finite-element code is altered and new code developed to deal with the acoustics of the ear canal and the mathematics of the fluid-structure interaction problem. A finite-element model of the human ear canal and eardrum using simplified geometry is developed as an initial approach to the coupled problem. The preliminary finite-element model consists of a cylindrical tube attached to a circular plate, with appropriate material properties assigned to each part. The coupled ear canal/eardrum problem is analyzed at several frequencies. Output is discussed in view of results obtained for eigenvalue analyses of both ear canal and eardrum as separate problems." --
Author : Gary Graydon Genge
Publisher :
ISBN 13 :
Total Pages : 60 pages
Book Rating : 4.:/5 (242 download)
Download or read book A Finite Element Analysis of the Middle Ear written by Gary Graydon Genge and published by . This book was released on 1985 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Chadia Mikhael
Publisher :
ISBN 13 :
Total Pages : 216 pages
Book Rating : 4.:/5 (617 download)
Download or read book Finite-element Modelling of the Human Middle Ear written by Chadia Mikhael and published by . This book was released on 2005 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The aim of our work was to build an accurate human middle-ear finite-element model that is based on accurate geometry and a priori material-property estimates." --
Author : Nidal Elkhouri
Publisher :
ISBN 13 :
Total Pages : 242 pages
Book Rating : 4.:/5 (252 download)
Download or read book Finite-element Modelling of the Gerbil Middle Ear written by Nidal Elkhouri and published by . This book was released on 2005 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Hearing loss is the third leading chronic disability after arthritis and hypertension, and the most frequent birth defect. Non-invasive diagnoses and middle-ear prostheses are often unsatisfactory, partly because of a lack of understanding of middle-ear mechanics. The focus of this thesis is to develop a 3-D finite-element model to quantify the mechanics of the gerbil middle ear. An MRM dataset with a voxel size of 45 &mgr;m, and an x-ray micro-CT dataset with a voxel size of 5 um, supplemented by histological images, are the basis for 3-D reconstruction and finite-element mesh generation. The eardrum model is based on moire shape measurements. The material properties of all the structures in the model are based on a priori estimates from the literature." --
