Sequential Multipoint Motion of the Tympanic Membrane Measured by Laser Doppler Vibrometry: Preliminary Results for Normal Tympanic Membrane
Sequential Multipoint Motion of the Tympanic Membrane Measured by Laser Doppler Vibrometry: Preliminary Results for Normal Tympanic Membrane
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DOI：
10.1097/mao.0000000000000242
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发表时间：
2014-04-01
影响因子：
2.1
通讯作者：
Kitano, Hiroya
中科院分区：
文献类型：
--
作者：
Kunimoto, Yasuomi;Hasegawa, Kensaku;Kitano, Hiroya
背景大量研究报道了声音诱导的鼓膜运动(TM)。为了用非接触式激光多普勒测振仪(LDV)显示整个TM的顺序运动特性，我们进行了多点TM测量。材料与方法在手术显微镜上安装激光多普勒测振仪。使用无反射器的非接触式激光测速仪测量TM上33个点的速度。测量采用1、3和6 kHz的音调刺激。结果在1 kHz和3 kHz频率下，TM运动比其他频率更清晰、更稳定。这是因为外耳道在3千赫附近起到了共振管的作用。TM运动在1 kHz处出现1个峰，在3 kHz处出现2个峰。后上象限(PSQ)在1 kHz，前下象限(AIQ)和PSQ在3 kHz处波幅较大。整个TM在1 kHz时以PSQ为中心显示同步运动，在3 kHz时PSQ和AIQ运动之间有相移。Umbo的波幅比其他部位小。结论鼓膜连续多点运动显示鼓膜的振动特性因部位和频率的不同而不同。
BackgroundNumerous studies have reported sound-induced motion of the tympanic membrane (TM). To demonstrate sequential motion characteristics of the entire TM by noncontact laser Doppler vibrometry (LDV), we have investigated multipoint TM measurement.Materials and MethodsA laser Doppler vibrometer was mounted on a surgical microscope. The velocity was measured at 33 points on the TM using noncontact LDV without any reflectors. Measurements were performed with tonal stimuli of 1, 3, and 6 kHz. Amplitudes were calculated from these measurements, and time-dependent changes in TM motion were described using a graphics application.ResultsTM motions were detected more clearly and stably at 1 and 3 kHz than at other frequencies. This is because the external auditory canal acted as a resonant tube near 3 kHz. TM motion displayed 1 peak at 1 kHz and 2 peaks at 3 kHz. Large amplitudes were detected in the posterosuperior quadrant (PSQ) at 1 kHz and in the PSQ and anteroinferior quadrant (AIQ) at 3 kHz. The entire TM showed synchronized movement centered on the PSQ at 1 kHz, with phase-shifting between PSQ and AIQ movement at 3 kHz. Amplitude was smaller at the umbo than at other parts. In contrast, amplitudes at high frequencies were too small and complicated to detect any obvious peaks.ConclusionSequential multipoint motion of the tympanic membrane showed that vibration characteristics of the TM differ according to the part and frequency.