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Wideband acoustic immittance: Suitable quantities for assessing middle-ear status.
Kren Monrad Nørgaard1,2, Jingxin Jessica Feng3, Susan E Voss3
1Interacoustics Research Unit, 2800 Kongens Lyngby, Denmark.
The Journal of the Acoustical Society of America
|March 25, 2026
Summary
Ear-canal wave quantities in acoustic immittance tests do not uniquely characterize middle-ear function due to confounding ear-canal geometry. Using invariant cross-sectional areas may improve clinical diagnostics up to 3 kHz.
Area of Science:
- Acoustics
- Bioacoustics
- Audiology
Background:
- Wideband acoustic immittance tests measure ear-canal wave quantities like absorbance.
- These quantities are used to assess middle-ear function.
- The physical significance and diagnostic utility of these wave quantities are debated.
Purpose of the Study:
- Investigate the physical significance of ear-canal wave quantities.
- Evaluate if these quantities uniquely characterize middle-ear function.
- Explore the influence of ear-canal geometry on wave quantity measurements.
Main Methods:
- Simulations of lumped-element and transmission-line ear canals.
- Measurements in 3D-printed ear canals (uniform and anatomical) with varying geometry.
- Termination of ear canals with a middle-ear simulator.
Main Results:
- Wave quantities using estimated or geometric areas do not uniquely characterize the middle ear, being confounded by ear-canal geometry.
- At low frequencies, ear-canal wave reflection is negligible, limiting meaningful middle-ear characterization.
- Wave quantities with invariant cross-sectional area are better for diagnostics up to 3 kHz but lose reflection information.
Conclusions:
- Ear-canal geometry significantly influences wave quantities, limiting their ability to uniquely characterize middle-ear function.
- The use of invariant cross-sectional area offers a potential improvement for clinical diagnostics.
- Further research is needed to refine wave quantity interpretation for accurate middle-ear assessment.
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