Complex Stapes Motions in Human Ears
Complex Stapes Motions in Human Ears
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DOI：
10.1007/s10162-010-0207-6
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发表时间：
2010-09-01
影响因子：
2.4
通讯作者：
Huber, Alexander M.
中科院分区：
文献类型：
--
作者：
Sim, Jae Hoon;Chatzimichalis, Michail;Huber, Alexander M.
据报道，人类和一些动物镫骨在低频时对声刺激的生理运动主要是活塞状的。在更高的频率下，这种模式包括围绕人类和动物耳底板的长轴和短轴的摇摆运动。这种扩展镫骨运动的测量对与测量装置相关的镫骨的精确角度和测量误差高度敏感。本研究利用扫描激光多普勒振动计（SLDV）系统测量了人类颞骨足部多个点在特定方向上的速度，并由此计算出足部运动的基本分量，即足部短轴和长轴的活塞运动和摇摆运动。通过从微ct图像中获取SLDV测量帧与底板固定帧的相关关系，计算出激光束相对于底板平面上测量点的角位置和坐标。摇摆运动相对于活塞运动的比率随频率增加而增加，并在7 kHz左右达到最大值。提出了一种定量评价复杂镫骨运动测量值和运动分量误差边界的新方法。在0.5 ~ 8 kHz的频率范围内，类活塞运动和两种摇摆运动的幅度均大于相应误差上限的估计值。
It has been reported that the physiological motion of the stapes in human and several animals in response to acoustic stimulation is mainly piston-like at low frequencies. At higher frequencies, the pattern includes rocking motions around the long and short axes of the footplate in human and animal ears. Measurements of such extended stapes motions are highly sensitive to the exact angulation of the stapes in relation to the measurement devices and to measurement errors. In this study, velocity in a specific direction was measured at multiple points on the footplates of human temporal bones using a Scanning Laser Doppler Vibrometer (SLDV) system, and the elementary components of the stapes motions, which were the piston-like motion and the rocking motions about the short and long axes of the footplate, were calculated from the measurements. The angular position of a laser beam with respect to the stapes and coordinates of the measurement points on the footplate plane were calculated by correlation between the SLDV measurement frame and the footplate-fixed frame, which was obtained from micro-CT images. The ratios of the rocking motions relative to the piston-like motion increased with frequency and reached a maximum around 7 kHz.A novel method for quantitatively assessing measurements of complex stapes motions and error boundaries of the motion components is presented. In the frequency range of 0.5 to 8 kHz, the magnitudes of the piston-like and two rocking motions were larger than estimated values of the corresponding upper error bounds.