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Acoustic radiation from bone vibrators

T Frank, A Holmes

    Ear and Hearing
    |March 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Bone vibrator acoustic radiation at 4000 Hz can affect bone conduction (BC) testing. The Radioear B-72 vibrator showed excessive acoustic radiation, potentially invalidating high-frequency air-bone gap results.

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    Area of Science:

    • Audiology
    • Bioacoustics
    • Hearing Science

    Background:

    • Bone conduction (BC) testing is crucial for diagnosing hearing loss.
    • High-frequency BC testing requires accurate sound delivery.
    • Acoustic radiation from bone vibrators may interfere with BC measurements.

    Purpose of the Study:

    • To evaluate the acoustic radiation from different bone vibrators at 4000 Hz.
    • To determine the impact of this acoustic radiation on BC thresholds.
    • To assess the validity of high-frequency air-bone gap measurements.

    Main Methods:

    • BC thresholds were measured using Radioear B-70A, B-71, and B-72 vibrators with occluded and unoccluded ear canals.
    • Probe-tube microphone measurements quantified acoustic radiation inside the ear canal for each vibrator and an air conduction source.

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  • Measurements were performed at comparable sensation levels.

    • Main Results:

    • The Radioear B-70A and B-71 vibrators exhibited minimal acoustic radiation at 4000 Hz.
    • The Radioear B-72 vibrator produced significant acoustic radiation.
    • This excessive radiation from the B-72 could artificially elevate BC thresholds.

    Conclusions:

    • The B-70A and B-71 are suitable for high-frequency BC testing.
    • The B-72 vibrator's acoustic radiation compromises the accuracy of BC thresholds.
    • Using the B-72 may lead to invalid high-frequency air-bone gap findings.