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Finite Element Modeling Of Human Middle Ear Based On Histological Sections Of One Human Temporal Bone
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Book Synopsis Finite Element Modeling of Human Middle Ear Based on Histological Sections of One Human Temporal Bone by : Peng Yan
Download or read book Finite Element Modeling of Human Middle Ear Based on Histological Sections of One Human Temporal Bone written by Peng Yan and published by . This book was released on 2002 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Finite Element Model of the Human Head for Simulation of Bone-conducted Sound by : You Chang
Download or read book A Finite Element Model of the Human Head for Simulation of Bone-conducted Sound written by You Chang and published by Linköping University Electronic Press. This book was released on 2018-04-03 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bone conduction is usually understood as the hearing sensation based on the vibrations of the skull bone and surrounding tissues. The fact that vibration of the skull bones can result in a sound percept has been known for a long time. However, it is difficult to give a general definition of BC sound. Normally, BC sound is described as the sound energy transmitted through the body (comprising the solid and fluid parts) then the outer, middle and inner ear are involved and finally produce a perception of sound. Even if BC sound perception has been studied for more than a century, the whole pattern of BC sound transmission is still not complete. There are limitations for experimental investigation of BC sound, such as the complexity of experimental manipulations and individual differences between subjects resulting in difficult to interpret outcomes. One way to overcome some of those issues is the use of a simulation model for BC sound. However, until now, the published models are unable to provide a holistic response of BC sound in the human. Therefore, the primary aim of this thesis is to develop a finite element model that could simulate BC sound transmission in the human. Based on cryosectional images of a female, the LiUHead was developed as a FE model of the human head with the structure and material properties of real human. Most the structures and tissues which could contribute to the BC transmission were included in the LiUHead. The simulation results of the LiUHead agreed with experimental data obtained in both cadaver heads and live humans. After the development and validation of the LiUHead, the model was used to investigate BC sound. Since BC sound is transmitted in and between the tissues, the power transmission of BC sound was investigated in the LiUHead in the frequency domain. When the stimulation was applied on the surface of the skull at the mastoid position, the results of the simulations show that, as the name suggest, the skull bone dominants the BC sound transmission. The soft tissues and cartilages are as the second most important media of the BC sound while the skull interior is the least important for the BC transmission. Moreover, according to the power flux in the skull, the BC vibrations are mainly concentrated at the skull base. Other important transmission pathways are located at the occipital bone at the posterior side of the head, but the power transmitted over the face, forehead and vertex is minor. There is power interaction between the skull bone and skull interior near the stimulation position but the transmission of sound power through the brain seem to be minimal. Since the power or energy is difficult to measure in an experimental setting, this investigation gave unique knowledge about BC sound transmission in the head and the interaction between the tissues. As a common application for BC sound, bone-conduction devices are used to stimulate the hearing and is a method for hearing loss rehabilitation. Nowadays many different kinds of BCDs are available. However, most studies failed to compare the different types of BCDs in the same conditions as well as between several BCDs as it is not possible to compare several BCDs within the same subject due to the implantation required for several BCDs. The model gives a unique opportunity to evaluate various BCDs in the same head. Eight different BCDs, including four kinds of skin-drive BCDs, three kinds of direct-drive BCDs, and one in-the-mouth device, were applied to the LiUHead and the simulation results were evaluated. The results proved that the direct-drive BCDs and the in-the-mouth device gave similar vibration responses at the cochlea. At low frequencies, the skin-drive BCDs had similar or even better cochlear responses than the direct-drive BCDs. However, the direct-drive BCDs gave stable responses at mid-frequencies and gave higher responses than the skin-drive BCDs at high frequencies. These results are beneficial evaluating and for designing and improving current BCDs. The ultimate goal of this thesis is to provide a computational model for BC sound that can be used for evaluation of BC sound transmission. This was accomplished by the LiUHead that gave results comparable to experimental data and enabled investigations that cannot easily be conducted in experiments.
Book Synopsis Finite-element Modelling of the Human Middle Ear Based on X-ray Micro-computed Tomography and Doppler Optical Coherence Tomography in the Same Ear by : Xuan Wang
Download or read book Finite-element Modelling of the Human Middle Ear Based on X-ray Micro-computed Tomography and Doppler Optical Coherence Tomography in the Same Ear written by Xuan Wang and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The middle ear plays a critical role in transferring sound into the inner ear. The vibration patterns of the tympanic membrane (TM) and ossicles have been investigated by many groups but, particularly at high frequencies, are still not well understood. Computational modelling of the middle ear offers a pathway toward a better understanding of the mechanical function of these structures. The tuning and validation of such models require accurate anatomical and mechanical experimental data, but such data usually come from populations of ears and little is known about how differences in individual anatomy and material properties affect middle-ear function. In this study we created a finite-element (FE) numerical model of a middle ear and validated it against vibration measurements from the same ear.A real-time phase-sensitive Doppler optical coherence tomography (OCT) system was used to measure the vibrations of both the TM and the ossicles of a human temporal bone at a stimulation frequency of 500 Hz. The measured vibration pattern of the TM showed a maximal displacement in the posterior region and a smaller maximum in the anterior region. The experimental data also showed smaller displacements on the ossicles, while the cochlear promontory appeared immobile as expected.A 3-D X-ray micro-computed tomography (microCT) scan was acquired for the same ear. A FE model of the middle ear was built using a combination of locally developed and other free and open-source software. The geometry was based on semi-automatic segmentation of the microCT images, and material properties were based on previous studies. A sensitivity analysis was performed to analyze the relative importance of the various parameters. The Doppler OCT images, masked by B-mode OCT images to reduce noise, were also segmented and the resulting 3-D model was transformed to Cartesian coordinates and aligned with the microCT-based model.Two FE solvers (Code_Aster and SAP IV) were used as part of the verification process. The simulated vibration patterns from the different solvers were compared with the measured Doppler-mode OCT velocity data and with data from the literature. The simulation results match well with the shape of the measured vibration pattern of the TM at 500 Hz. Co-registration of OCT and microCT for individual ears is a viable approach for building and validating FE models. If extended to clinical CT scans, this process could lead to patient-specific models and improved diagnosis of pathological changes in the middle ear. The process of creating FE models for the middle ear would need to be streamlined for clinical applications." --
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.
Book Synopsis Computer-integrated Finite Element Modeling and Simulation of Human Middle Ear by : Qunli Sun
Download or read book Computer-integrated Finite Element Modeling and Simulation of Human Middle Ear written by Qunli Sun and published by . This book was released on 2001 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Middle Ear Mechanics In Research And Otology - Proceedings Of The 3rd Symposium by : Kiyofumi Gyo
Download or read book Middle Ear Mechanics In Research And Otology - Proceedings Of The 3rd Symposium written by Kiyofumi Gyo and published by World Scientific. This book was released on 2004-07-26 with total page 457 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book aims to facilitate the exchange of ideas between otosurgeons and engineers on common topics such as middle ear function, tympanoplasty, implantable hearing devices and ear prostheses. Due to recent advances in technology, gene-therapy and tissue-engineering procedures will also be important issues in the treatment of middle ear disease.
Book Synopsis Finite-element Modelling of the Human Middle Ear by : Chadia Mikhael
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." --
Book Synopsis A Finite-Element Model for Evaluation of Middle Ear Mechanics by :
Download or read book A Finite-Element Model for Evaluation of Middle Ear Mechanics written by and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A computer model of the middle ear, ossicular chain and eardrum was established using the finite-element method. A preliminary comparison of the model with measurements made in human-cadaver ears shows that the model is in approximate agreement with the form of the middle ear function. The computer model will be used for implant design.
Book Synopsis The Temporal Bone and the Ear by : Theodore Hieronymus Bast
Download or read book The Temporal Bone and the Ear written by Theodore Hieronymus Bast and published by . This book was released on 1949 with total page 844 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Finite-element Model of the Human Eardrum and Middle Ear by : Sam J. Daniel
Download or read book Finite-element Model of the Human Eardrum and Middle Ear written by Sam J. Daniel and published by . This book was released on 2002 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The model allows an improved understanding of the mechanics of the human middle ear, can simulate various pathological conditions, and assist in the design of ossicular prostheses." --
Book Synopsis Finite Element Analysis of the Normal and Surgically Reconstructed Human Middle Ear by : Peter Ferris
Download or read book Finite Element Analysis of the Normal and Surgically Reconstructed Human Middle Ear written by Peter Ferris and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Temporal Bone written by Mario Sanna and published by Georg Thieme Verlag. This book was released on 2005-10-05 with total page 339 pages. Available in PDF, EPUB and Kindle. Book excerpt: The anatomy of the temporal bone is one of the most complicated areas in the human body. The vital structures, the three-dimensional relationships involved, and the fact that these structures are hidden within bony canals make the anatomy difficult to grasp. Described as a dream come true by the authors, Professor Sanna and his colleagues have devoted a major effort to creating this book to serve as a guide for young trainees wanting to learn more about temporal bone dissection. It provides comprehensive, high-quality, full-color pictures of the detailed steps of all the major surgical approaches that can be performed in the temporal bone, supplemented by images of cadaveric dissections as an aid to understanding the intracranial anatomy when indicated by the approach. Dr. Sanna is part of The Grupppo Otologico, a world-renowned specialist center for the diagnosis and medical and surgical treatment of diseases of the ear, skull base, facial nerve, head and neck, and paranasal sinuses. More information is available on the group's website, www.gruppootologico.it/eng.
Book Synopsis A Theoretical Study Into the Effect of Load on the Human Eardrum and Middle Ear Using Finite Element Analysis by : Tristram Hugh John Lesser
Download or read book A Theoretical Study Into the Effect of Load on the Human Eardrum and Middle Ear Using Finite Element Analysis written by Tristram Hugh John Lesser and published by . This book was released on 1993 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Microscopic Anatomy of the Temporal Bone by : Dorothy Wolff
Download or read book Microscopic Anatomy of the Temporal Bone written by Dorothy Wolff and published by . This book was released on 1957 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Determination of the Dynamic Response of the Human Middle Ear Components by Finite Element Methods by : David W. Gilbert
Download or read book Determination of the Dynamic Response of the Human Middle Ear Components by Finite Element Methods written by David W. Gilbert and published by . This book was released on 1980 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Anatomy of the Temporal Bone with Surgical Implications, Second Edition by : A.J. Gulya
Download or read book Anatomy of the Temporal Bone with Surgical Implications, Second Edition written by A.J. Gulya and published by CRC Press. This book was released on 1994-11-15 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: An outstanding textbook on the anatomy of the temporal bone with surgical information, lavishly illustrated,with a set of unique stereoscopic, three-dimensional color reels that assist the reader in accurately visualizing the complex structures of the inner ear. The human temporal bone collection at the Massachusetts Eye and Ear Infirmary, comprising 1518 specimens from 862 individuals, served as the primary resource for the material contained in this book, which includes some 350 selected photomicrographs as well as sets of horizontally and vertically serially sectioned specimens depicting normal and variant anatomy of the human temporal bone. The embryology chapter includes 40 photomicrographs of fetal and newborn temporal bones and is designed to review development in an easily assimilated manner. New to the second edition are color photographs of the macroscopic human temporal bone and an expansion of the descriptive text accompanying the temporal bone dissection series.
Book Synopsis Virtual Middle Ear by : Mattia Ferrazzini
Download or read book Virtual Middle Ear written by Mattia Ferrazzini and published by . This book was released on 2003 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
