The Effect of Ear Canal Orientation on Tympanic Membrane Motion and the Sound Field Near the Tympanic Membrane

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• 作者：Jeffrey Tao Cheng ; Michael Ravicz…
• 关键词：ear canal orientation ; tympanic membrane motion ; umbo displacement ; sound pressure distribution ; middle ear ; stroboscopic holography
• 刊名：JARO - Journal of the Association for Research in Otolaryngology
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：16
• 期：4
• 页码：413-432
• 全文大小：4,480 KB
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• 作者单位：Jeffrey Tao Cheng (1)
  Michael Ravicz (1)
  Jérémie Guignard (1)
  Cosme Furlong (1) (2)
  John J. Rosowski (1) (3)
  
  1. Eaton-Peabody Laboratory, Department of Otology and Laryngology, Massachusetts Eye and Ear Infirmary, Harvard Medical School, 243 Charles Street, Boston, MA, 02114, USA
  2. Center for Holographic Studies and Laser Micro-mechaTronics, Department of Mechanical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA, 01609, USA
  3. Speech and Hearing Bioscience and Technology Program, MIT-Harvard Division of Health Sciences and Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
  
• 刊物类别：Medicine
• 刊物主题：Medicine & Public Health
  Otorhinolaryngology
  Neurosciences
  Neurobiology
  
• 出版者：Springer New York
• ISSN：1438-7573

文摘

The contribution of human ear canal orientation to tympanic membrane (TM) surface motion and sound pressure distribution near the TM surface is investigated by using an artificial ear canal (aEC) similar in dimensions to the natural human ear canal. The aEC replaced the bony ear canal of cadaveric human temporal bones. The radial orientation of the aEC relative to the manubrium of the TM was varied. Tones of 0.2 to 18.4?kHz delivered through the aEC?induced surface motions of the TM that were quantified using stroboscopic holography; the distribution of sound in the plane of the tympanic ring P TR was measured with a probe tube microphone. The results suggest that the ear canal orientation has no substantial effect on TM surface motions, but P TR at frequencies above 10?kHz is influenced by the ear canal orientation. The complex TM surface motion patterns observed at frequencies above a few kilohertz are not correlated with simpler variations in P TR distribution at the same frequencies, suggesting that the complex sound-induced TM motions are more related to the TM mechanical properties, shape, and boundary conditions rather than to spatial variations in the acoustic stimulus.