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Measuring Spatially- and Directionally-varying Light Scattering from Biological Material

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Inverse solution of ear-canal area function from reflectance.

Daniel M Rasetshwane¹, Stephen T Neely

¹Boys Town National Research Hospital, 555 North 30th Street, Omaha, Nebraska 68131, USA. daniel.rasetshwane@boystown.org

The Journal of the Acoustical Society of America

|January 10, 2012

Summary

This study introduces a non-invasive method to map the ear canal's shape using acoustic impedance measurements. This technique accurately determines the ear canal area function, crucial for acoustical applications.

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Area of Science:

Acoustics
Bioacoustics
Medical Imaging

Background:

Acoustical applications necessitate transforming measurements from the ear canal entrance to the eardrum.
Accurate ear canal shape (area function) is vital for these transformations.
Existing methods for measuring ear canal area functions are often invasive, slow, or incomplete.

Purpose of the Study:

To develop a non-invasive, fast, and reproducible method for determining the ear canal area function.
To enable accurate transformation of acoustical quantities from the ear canal entrance to the eardrum.

Main Methods:

The method solves an inverse problem using acoustic impedance measurements at the ear canal entrance.
It calculates acoustic reflectance from impedance data.
The reflectance is then used to derive the ear canal's area function.

Main Results:

The determined mean ear-canal area function aligns with results from previous research using different techniques.
The proposed method offers a non-invasive, rapid, and reproducible alternative to existing approaches.

Conclusions:

The developed method provides an effective means to measure the ear canal area function non-invasively.
This advancement is significant for various acoustical applications requiring precise ear canal geometry.