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Medicina is published by MDPI from Volume 54 Issue 1 (2018). Articles in this Issue were published by another publisher in Open Access under a CC-BY (or CC-BY-NC-ND) licence. Articles are hosted by MDPI on mdpi.com as a courtesy and upon agreement with Lithuanian Medical Association, Lithuanian University of Health Sciences, and Vilnius University.
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Medicina 2009, 45(11), 878; https://doi.org/10.3390/medicina45110113

Laser Doppler vibrometry of the middle ear in humans: derivation dependence, variability, and bilateral differences

1
Department of Ear, Nose, and Throat Diseases, Vilnius University Emergency Hospital, Lithuania
2
Clinic of Otorhinolaryngology, Department of Medicine, Dresden Technical University, Dresden, Germany
3
Center of Audiology and Hearing Rehabilitation, Tbilisi, Georgia
*
Author to whom correspondence should be addressed.
Received: 24 October 2008 / Accepted: 6 November 2009 / Published: 11 November 2009
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Abstract

Objective. Derivation dependence, inter- and intrasubject/intertest variability, bilateral differences of the eardrum vibration characteristics have been investigated using laser Doppler vibrometry (LDV).
Material and methods. A total of 31 normally hearing adults were examined. In each subject, both ears were consecutively stimulated by the chirp acoustic stimulus that covered 500–3700-Hz frequencies. The laser beam was directed to and the reflection was consecutively picked up from the tympanic membrane surface.
Results
. LDV curves derived from different eardrum loci possessed dissimilar characteristics. The derivation area dependence was particularly apparent for the stimulus frequency constituents above 1500 Hz. The intersubject variability of LDV parameters exceeded the intrasubject/ intertest one. The intersubject divergences looked selectively distinct for the frequencies over 2000 Hz. Under repeated recordings, LDV parameters remained stable. The intertest differences, if appeared, concerned predominantly the magnitudes of separate frequency bands. LDV waveforms registered by experienced and beginner investigators were alike. Bilaterally derived LDV curves regularly differed from each other. In individual cases, the bilateral divergences approximated the intersubject deviation.
Conclusions. The derivation area on the eardrum should be taken into account when estimating the actual LDV recording. Over repeated recordings in separate individuals, LDV waveforms are stable while the experience of investigator has slight if any influence on the principal LDV characteristics. Due to bilateral differences in the middle ear transfer function, in LDV testing of the ear suspected to the pathology, LDV recording from the opposite healthy ear could hardly be taken as an appropriate reference sample.
Keywords: laser Doppler vibrometry; derivation dependence; variability; bilateral differences laser Doppler vibrometry; derivation dependence; variability; bilateral differences
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Arechvo, I.; Lasurashvili, N.; Bornitz, M.; Kevanishvili, Z.; Zahnert, T. Laser Doppler vibrometry of the middle ear in humans: derivation dependence, variability, and bilateral differences. Medicina 2009, 45, 878.

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