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Developing standards for distortion product otoacoustic emission measurements
David M Mills1, M Patrick Feeney, Eli J Drake
1Virginia Merrill Bloedel Hearing Research Center, Box 357923, University of Washington, Seattle, WA 98195-7923, USA. dmmills@consult-services.info
The Journal of the Acoustical Society of America
|October 2, 2007
Summary
Comparing distortion product otoacoustic emission (DPOAE) systems revealed horizontal transformations improve data consistency. Standardization of DPOAE equipment and methods is recommended for reduced measurement variability.
Area of Science:
- Audiology
- Biomedical Engineering
- Otoacoustic Emissions
Background:
- Distortion product otoacoustic emissions (DPOAEs) are crucial for assessing cochlear function.
- Variability exists between different DPOAE measurement systems, impacting data comparability.
- Standardization is needed to ensure reliable DPOAE measurements.
Purpose of the Study:
- To investigate DPOAE measurement characteristics across different systems.
- To evaluate methods for transforming DPOAE data between systems.
- To propose standardization strategies for DPOAE measurements.
Main Methods:
- Compared DPOAE responses from two measurement systems in 40 volunteers.
- Conducted test-retest measurements on 20 ears for each system.
- Analyzed input-output functions and applied linear transformations (horizontal and vertical).
Main Results:
- Horizontal transformations, adjusting stimulus levels, yielded better agreement between systems.
- Required horizontal shifts (8-14 dB at 4-8 kHz) exceeded test-retest variability.
- Transformed emission amplitudes showed high correlations (r=0.81-0.89).
Conclusions:
- Horizontal transformation is effective for reconciling DPOAE data between systems.
- Standardized equipment, including optimized probes and intensity calibration, is essential.
- Focusing on emission threshold measurement can reduce variability.
