New data on the motion of the normal and reconstructed tympanic membrane.
New data on the motion of the normal and reconstructed tympanic membrane.
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DOI：
10.1097/mao.0b013e31822e94f3
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发表时间：
2011-12
期刊：
影响因子：
--
通讯作者：
Furlong C
中科院分区：
文献类型：
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作者：
Rosowski JJ;Cheng JT;Merchant SN;Harrington E;Furlong C
声引起的鼓膜运动具有与对均匀刺激的模态反应最一致的特征。鼓膜运动与听骨链耦合的概念模型可以分为对整个鼓膜均匀刺激的模态响应，或行波模型，其中声能在鼓膜边缘被捕获并沿着表面传播到鼓膜。我们采用的频闪全息技术可以分离鼓膜表面的强模态或行波主导的运动。我们使用带有频闪照明的计算机辅助光电全息术来测量人类尸体颞骨鼓膜表面上 40000 多个点的声音诱发运动的幅度和相位。我们的技术对小至 0.01 微米的膜运动敏感，并且可以在高达 20 kHz 的频率下测定膜位移。我们报告了人类鼓膜上模态鼓膜反应和行波的明显迹象。在整个频率范围内都可以看到模态响应，而行波在 2 至 8 kHz 之间最为明显。一般来说，行波的幅度比模态幅度小。鼓膜的大部分运动可以很好地近似于 TM 表面的模态运动。这一结论对鼓膜病理学及其治疗具有重要意义。
The sound-induced motion of the tympanic membrane has features that are most consistent with modal responses to a uniform stimulus. Conceptual models of the coupling of tympanic-membrane motion to the ossicular chain can be classified as either modal responses to a uniform stimulation of the entire membrane, or traveling wave models in which sound energy is captured at the membrane’s rim and travels along the surface to the umbo. The stroboscopic holography technique we employ can separate strongly modal or traveling-wave dominated motions of the tympanic membrane surface. We use computer-aided opto-electronic holography with stroboscopic illumination to measure the magnitude and phase of the sound-induced motion of over 40000 points on the surface of the tympanic membrane in cadaveric human temporal bones. Our techniques are sensitive to motions of the membrane as small as 0.01 microns, and allow determinations of membrane displacement at frequencies as large as 20 kHz. We report clear signs of both modal tympanic membrane responses and traveling waves on the human tympanic membrane. Modal responses are seen throughout the frequency range, while the traveling waves are most apparent between 2 and 8 kHz. In general, the magnitudes of the traveling waves are small compared to the modal magnitudes. Much of the motion of the tympanic membrane is well approximated by modal motions of the TM surface. This conclusion has implications for ear drum pathology and its treatment.