Document Detail

An overview of wideband immittance measurements techniques and terminology: you say absorbance, I say reflectance.
MedLine Citation:
PMID:  23900187     Owner:  NLM     Status:  MEDLINE    
This article reviews the relationships among different acoustic measurements of the mobility of the tympanic membrane, including impedance, admittance, reflectance, and absorbance, which the authors group under the rubric of immittance measures. Each of these quantities is defined and related to the others. The relationship is most easily grasped in terms of a straight rigid ear canal of uniform area terminated by a uniform middle ear immittance placed perpendicular to the long axis of the ear canal. Complications due to variations from this geometry are discussed. Different methods for measuring these quantities are described, and the assumptions inherent within each method are made explicit. The benefits of wideband measurements of these quantities are described, as are the benefits and limitations of different components of immittance and reflectance/absorbance. While power reflectance (the square of the magnitude of pressure reflectance) is relatively invariant along the length of the ear canal, it has the disadvantage that it ignores phase information that may be useful in assessing the presence of acoustic leaks in ear-canal measurements and identifying other potential error sources. A combination of reflectance and impedance magnitude and angle give a more complete description of the middle ear from measurements in the ear canal.
John J Rosowski; Stefan Stenfelt; David Lilly
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Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  Ear and hearing     Volume:  34 Suppl 1     ISSN:  1538-4667     ISO Abbreviation:  Ear Hear     Publication Date:  2013 Jul 
Date Detail:
Created Date:  2013-07-31     Completed Date:  2014-03-11     Revised Date:  2014-07-02    
Medline Journal Info:
Nlm Unique ID:  8005585     Medline TA:  Ear Hear     Country:  United States    
Other Details:
Languages:  eng     Pagination:  9S-16S     Citation Subset:  IM    
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MeSH Terms
Acoustic Impedance Tests / methods*
Audiology / instrumentation*
Hearing Disorders / diagnosis*
Terminology as Topic*
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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