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Quantifying ear-canal geometry with multiple computer-assisted tomographic scans

D P Egolf1, D K Nelson, H C Howell

  • 1Auditory and Electroacoustics Research Group, Palatine, Illinois 60067.

The Journal of the Acoustical Society of America
|May 1, 1993
PubMed
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This study presents a new noninvasive method using computer-assisted tomographic (CAT) scans to accurately map the ear canal's geometry. This detailed anatomical data improves sound pressure measurements for audiological tests.

Area of Science:

  • Biomedical Engineering
  • Audiology
  • Medical Imaging

Background:

  • Accurate sound-pressure spectrum at the eardrum is crucial for audiological tests.
  • Current methods rely on mathematical models to adjust microphone readings from accessible ear canal positions to the eardrum plane.
  • Increasing bandwidths of audiological instruments necessitate more precise geometric ear canal models.

Purpose of the Study:

  • To develop and evaluate a noninvasive procedure for acquiring detailed geometry of the human ear canal.
  • To improve the accuracy of ear canal volume and cross-sectional area measurements for audiological applications.

Main Methods:

  • Employed a two-step computer-assisted tomographic (CAT) scanning procedure to obtain radiographic images of parasagittal cross sections.

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  • Acquired images at uniform intervals along the lateral length of the ear canal.
  • Evaluated accuracy by comparing CAT scan cross-sectional areas with corresponding microtome slices of an injection mold of the same ear canal.

    • Main Results:

    • The mean percent difference between CAT scan and microtome cross-sectional areas was 9.65% for 26 sections.
    • Ear canal volume estimated from CAT images showed a 6.12% difference compared to the injection mold volume.
    • This represents a significant improvement over the 39% maximum error of conventional acoustic volume measurements.

    Conclusions:

    • Computer-assisted tomographic (CAT) scanning provides a highly accurate, noninvasive method for detailed ear canal geometry acquisition.
    • This technique offers superior precision for ear canal volume and cross-sectional area estimation compared to traditional methods.
    • The enhanced geometric accuracy has direct implications for improving the precision of audiological tests and measurements.