Impedance and admittance tympanometry. I. Experimental approach

Area of Science:

• Audiology
• Biomedical Engineering
• Medical Physics

Background:

• Tympanometry is crucial for assessing middle ear function.
• Current methods may require conversion between different admittance measures.
• Ear canal admittance subtraction is a key factor in accurate tympanometry.

Purpose of the Study:

• To develop and validate a procedure for converting susceptance and conductance tympanograms to reactance and resistance tympanograms.
• To address the challenge of ear canal admittance subtraction in tympanometric analysis.
• To apply the developed method to various tympanogram shapes.

Main Methods:

• An experimental procedure was developed for tympanogram conversion.
• The method specifically accounts for the subtraction of ear canal admittance.
• The procedure was tested on bell-shaped and W-notched susceptance and conductance tympanograms.

Main Results:

• The conversion procedure successfully transformed tympanometric data.
• Computed reactance tympanograms consistently exhibited an inverted-V shape.
• Computed resistance tympanograms consistently displayed a flat characteristic.

Conclusions:

• The developed procedure enables accurate conversion between tympanometric measures.
• This method enhances the analysis of middle ear function through reactance and resistance tympanograms.
• The findings provide a valuable tool for audiological diagnostics and research.