骨導雑音法におけるオープン型耳せんの使用と基準レベルの検討

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  • Use of insert earphone with an open ear tip and reference level in the bone conduction noise method as a test of bone conduction threshold

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In bone conduction audiometry, the bone conduction noise method (modified Rainville method) can be used as an alternative to the ordinary test method using contralateral masking when it is difficult to obtain the accurate threshold of the ear being tested. In this study, it was first confirmed from the measurement of 24 otologically normal subjects that the lowering of the bone conduction threshold at low frequencies (occlusion effect) could be substantially eliminated by the use of an insert earphone with an open ear tip. We next postulated the reference level of bone conduction noise as being equal to the equivalent threshold force level+4dB, when the bone conduction noise is within the critical band width. Finally, bone conduction thresholds of 32 otologically normal subjects using the ordinary test method and the bone conduction noise method were obtained at 5 octave frequencies. As a result, both thresholds agreed, on average, within 5 dB at each frequency, suggesting the validity of the postulated reference level. It was expected that objective calibration of bone conduction noise according to that reference level, if provided by the manufacturer of the audiometer, would facilitate the clinical use of this method.

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