Design of hearing aid shells by three dimensional laser scanning and mesh reconstruction

Journal of Biomedical Optics
Gabriella TognolaFerdinando Grandori

Abstract

Hearing aid shells (or earmolds) must couple the hearing aid with the user's ear. Earmolds have to fit the subject's outer ear canal properly to ensure a good performance of the aid. Because of the great variability in the anatomical pattern of the ear, earmolds are custom made. At present, an impression of the subject's ear canal is taken and used to fabricate the silicon-made mold. The postimpression activities that typically are performed during the fabrication process modify the physical dimensions of the resulting earmold and thus affect the fit of the product. A novel system for 3-D laser scanning and mesh reconstruction of the surface of ear canal impressions is presented. The reconstructed impression can be digitally stored and passed directly to dedicated CAD 3-D printing machines to model the silicon earmold and thus achieve the best possible fit. The proposed system is based on a couple of cameras and a commercial laser for the surface digitization and on a straightforward algorithm, based on the deformation of a geometric model, for the reconstruction of the acquired surface. Measurements on objects of well-known geometric features and dimensions are performed to assess the accuracy and repeatability levels of this ...Continue Reading

References

Mar 1, 1996·Computer Methods and Programs in Biomedicine·T JosefssonP O Eriksson

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Citations

Apr 4, 2015·Journal of the American Society of Echocardiography : Official Publication of the American Society of Echocardiography·Kanwal M Farooqi, Partho P Sengupta
Sep 30, 2016·The International Journal of Cardiovascular Imaging·Massimiliano CantinottiShelby Kutty
Mar 10, 2012·Otolaryngology--head and Neck Surgery : Official Journal of American Academy of Otolaryngology-Head and Neck Surgery·Chin-Kuo ChenPo-Hsiang Tsui
Jun 6, 2012·Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology·Hossein MahboubiHamid R Djalilian
Nov 22, 2019·Indian Journal of Otolaryngology and Head and Neck Surgery : Official Publication of the Association of Otolaryngologists of India·Pragya SinghBrij Bhushan Thukral

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