Title page for ETD etd-10262011-162320


Document Type Master's Dissertation
Author Malherbe, Tiaan Krynauw
Email tiaan.malherbe@up.ac.za
URN etd-10262011-162320
Document Title Development of a method to create subject specific cochlear models for electric hearing
Degree MEng
Department Electrical, Electronic and Computer Engineering
Supervisor
Advisor Name Title
Prof J J Hanekom Co-Supervisor
Prof T Hanekom Supervisor
Keywords
  • 3D model
  • subject specific
  • brain stem response data
  • μ-CT scan
  • EABR
  • FEM model
  • neural model
  • cochlear model
Date 2009-09-02
Availability unrestricted
Abstract
Cochlear implants are electronic devices intended for restoring hearing to the profoundly deaf. Unfortunately the degree of restored hearing varies greatly between subjects. To investigate some of the mechanisms that determine this variability, mathematical models of the auditory system are used. The level of detail that these models incorporate varies greatly. The present study describes the development of a method to create high detail, subject specific cochlea models. μ-CT scans and photomicrographs were used to obtain the morphology and histology of a specific guinea pig cochlea. A 3D model was constructed from this data and the finite element method was used to determine the potential distribution inside the cochlea. The potential distribution was calculated for different stimulus protocols applied to different modelled electrodes. A neuron model was then used to obtain neural excitation profiles.

The modelled excitation profiles were compared to data from literature and it was found that this model is valid and can be used as a tool in electric hearing research. The model output was also compared to brainstem response data from the specific subject to assess the degree to which this model can predict brain stem data from a specific subject. Possible improvements to the model were also discussed.

2009 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria.

Please cite as follows:

Malherbe, TK 2009 Development of a method to create subject specific cochlear models for electric hearing, MEng dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://upetd.up.ac.za/thesis/available/etd-10262011-162320 / >

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