Analysis of Deformation of the Human Ear and Canal Caused by Mandibular Movement

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    Abstract

    Many hearing aid users experience physical discomfort when wearing their device. The main contributor to this problem is believed to be deformation of the ear and ear canal caused by movement of the mandible. Physical discomfort results from added pressure on soft tissue areas in the ear. Identifying features that can predict potential deformation is therefore important for identifying problematic cases in advance. A study on the physical deformation of the human ear and canal due to movement of the mandible is presented. The study is based on laser scannings of 30 pairs of ear impressions from 9 female and 21 male subjects. Two impressions have been taken from each subject, one with open mouth, and one with the mouth closed. All impressions are registered using non-rigid surface registration and a shape model is built. From each pair of impressions a deformation field is generated and propagated to the shape model, enabling the building of a deformation model in the reference frame of the shape model. A relationship between the two models is established, showing that the shape variation can explain approximately 50% of the variation in the deformation model. An hypothesis test for significance of the deformations for each deformation field reveals that all subjects have significant deformation at Tragus and in the canal. Furthermore, a relation between the magnitude of the deformation and the gender of the subject is demonstrated. The results are successfully validated by comparing the outcome to the anatomy by using a single set of high resolution histological sectionings of the region of interest.
    Original languageEnglish
    Title of host publicationLecture Notes in Computer Science : Medical Image Computing and Computer-Assisted Intervention – MICCAI 2007
    VolumeVolume 4792
    Place of PublicationBerlin / Heidelberg
    PublisherSpringer
    Publication date2007
    Pages801-808
    ISBN (Print)978-3-540-75758-0
    DOIs
    Publication statusPublished - 2007
    Event10th International Conference on Medical Image Computing and Computer-Assisted Intervention - Brisbane, Australia
    Duration: 29 Oct 20072 Nov 2007
    Conference number: 10

    Conference

    Conference10th International Conference on Medical Image Computing and Computer-Assisted Intervention
    Number10
    CountryAustralia
    CityBrisbane
    Period29/10/200702/11/2007

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