Harkrider A W, Martin F N
Department of Communication Sciences and Disorders, The University of Texas at Austin, 78712-1089, USA.
J Am Acad Audiol. 1998 Dec;9(6):410-6.
Sound pressure levels in the external auditory canals of 50 subjects were measured at 2000 and 4000 Hz with a bone-conduction vibrator on the forehead, the mastoid ipsilateral to the probe microphone, and the mastoid contralateral to the probe microphone. A plug was placed in the external auditory canal to minimize sound pressure levels in the external auditory canal produced by the osseotympanic mode of bone conduction. Results suggest that clinically significant false air-bone gaps (greater than 10 dB) due to acoustic radiation into the concha from the bone-conduction vibrator are most likely to occur at 4000 Hz when the bone-conduction vibrator is placed on the mastoid of the test ear. To minimize the possible confounding effects of acoustic radiation, the bone-conduction vibrator may be placed on the forehead or the mastoid contralateral to the test ear while masking the nontest ear.
使用置于前额、与探头麦克风同侧的乳突以及与探头麦克风对侧的乳突上的骨传导振动器，在2000赫兹和4000赫兹频率下测量了50名受试者外耳道中的声压级。在外耳道中放置一个耳塞，以尽量减少骨传导的骨鼓模式在外耳道中产生的声压级。结果表明，当骨传导振动器置于测试耳的乳突上时，由于骨传导振动器向耳甲腔的声辐射导致临床上显著的假气骨间隙（大于10分贝）最有可能在4000赫兹时出现。为尽量减少声辐射可能产生的混杂效应，可将骨传导振动器置于前额或测试耳对侧的乳突上，同时对非测试耳进行掩蔽。
