Errors in measurement of three-dimensional motions of the stapes using a Laser Doppler Vibrometer system

Sim, Jae Hoon; Lauxmann, Michael; Chatzimichalis, Michail; Röösli, Christof; Eiber, Albrecht; Huber, Alexander

doi:10.1016/j.heares.2010.08.009

Cited by 11 publications

(13 citation statements)

References 25 publications

(44 reference statements)

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“…However, a harmonic excitation of 1.25 kHz may be comparable to the 0.4-ms click excitation. Earlier measurements (Sim et al 2010b) of physiological stapes motions on guinea pigs have been carried out with harmonic excitation. The measured physiological motions of the stapes at 1.25 kHz were fed into the mathematical description for calculating the two CAP components.…”

Section: Discussionmentioning

confidence: 99%

“…In our previous work (Sim et al 2010b), it was shown that the values measured by the LDV systems have a level-independent error, and thus the measured values of small magnitudes contain a relatively small signal-to-noise ratio. Thereby, in fitting the mathematical description of CAP to measured data as described in the previous section, the error function in each measurement was weighted by the amplitude of the measured CAP (Eq.…”

Section: Signal-to-noise Ratiomentioning

confidence: 97%

“…The animal holder and the stimulator were adjustable by micromanipulators and goniometers (Breuninger 2008). A surgical microscope was used to align the long axis of the stapes footplate along the direction of the "directional indicator" on the head holder, and the head-holder was placed in the test stand such that the long and short axes of the footplate were parallel and perpendicular to the three axes of the test stand (Sim et al 2010b). To measure the CAP as a response of the cochlea, a custom-made silver-ball electrode was placed in the round window niche.…”

Section: Animal Preparation and Experimental Setupmentioning

confidence: 99%

“…Details about mechanical excitation and measurement procedures used in this study were described in our previous publications (Eiber et al 2007;Breuninger 2008, Huber et al 2008Sim et al 2010b).…”

Section: Mechanical Stimulation Of the Stapes And Measurementsmentioning

confidence: 99%

“…The first error source was expected to have significant effects for small magnitudes of the measured values (Sim et al 2010b). As the latter two error sources were already discussed in our previous work (Huber et al 2008;Sim et al 2010b), we now consider this error factor quantitatively with respect to k.…”

Section: Error Sources In Measurementsmentioning

confidence: 99%

See 4 more Smart Citations

Contribution of complex stapes motion to cochlea activation

Eiber¹,

Huber²,

Lauxmann³

et al. 2012

Hearing Research

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Section: Discussionmentioning

confidence: 99%

Section: Signal-to-noise Ratiomentioning

confidence: 97%

Section: Animal Preparation and Experimental Setupmentioning

confidence: 99%

Section: Mechanical Stimulation Of the Stapes And Measurementsmentioning

confidence: 99%

Section: Error Sources In Measurementsmentioning

confidence: 99%

See 3 more Smart Citations

Contribution of complex stapes motion to cochlea activation

Eiber¹,

Huber²,

Lauxmann³

et al. 2012

Hearing Research

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Characterization of Stapes Anatomy: Investigation of Human and Guinea Pig

Sim

Röösli

Chatzimichalis

et al. 2013

JARO

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The accuracy of any stapes model relies on the accuracy of the anatomical information upon which it is based. In many previous models and measurements of the stapes, the shape of the stapes has been considered as symmetric with respect to the long and short axes of the footplate. Therefore, the reference frame has been built based upon this assumption. This study aimed to provide detailed anatomical information on the dimensions of the stapes, including its asymmetries. High-resolution microcomputed tomography data from 53 human stapes and 11 guinea pig stapes were collected, and their anatomical features were analyzed. Global dimensions of the stapes, such as the size of the footplate, height, and volume, were compared between human and guinea pig specimens, and asymmetric features of the stapes were quantitatively examined. Further, dependence of the stapes dimensions on demographic characteristics of the subjects was explored. The height of the stapes relative to the footplate size in the human stapes was found to be larger than the corresponding value in guinea pig. The stapes showed asymmetry of the footplate with respect to the long axis and offset of the stapes head from the centroid of the medial surface of the footplate for both humans and guinea pigs. The medial surface of the footplate was curved, and the longitudinal arches of the medial surface along the long axis of the footplate were shaped differently between humans and guinea pigs. The dimension of the footplate was gender-dependent, with the size greater in men than in women.

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A method to measure sound transmission via the malleus–incus complex

et al. 2016

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BACKGROUND: The malleus-incus complex (MIC) plays a crucial role in the hearing process as it transforms and transmits acoustically-induced motion of the tympanic membrane, through the stapes, into the inner-ear. However, the transfer function of the MIC under physiologically-relevant acoustic stimulation is still under debate, especially due to insufficient quantitative data of the vibrational behavior of the MIC. This study focuses on the investigation of the sound transformation through the MIC, based on measurements of three-dimensional motions of the malleus and incus with a full six degrees of freedom (6 DOF). METHODS: The motion of the MIC was measured in two cadaveric human temporal bones with intact middle-ear structures excited via a loudspeaker embedded in an artificial ear canal, in the frequency range of 0.5-5 kHz. Three-dimensional (3D) shapes of the middle-ear ossicles were obtained by sequent micro-CT imaging, and an intrinsic frame based on the middle-ear anatomy was defined. All data were registered into the intrinsic frame, and rigid body motions of the malleus and incus were calculated with full six degrees of freedom. Then, the transfer function of the MIC, defined as velocity of the incus lenticular process relative to velocity of the malleus umbo, was obtained and analyzed. RESULTS: Based on the transfer function of the MIC, the motion of the lenticularis relative to the umbo reduces with frequency, particularly in the 2-5 kHz range. Analysis of the individual motion components of the transfer function indicates a predominant medial-lateral component at frequencies below 1 kHz, with low but considerable anterior-posterior and superior-inferior components that become prominent in the 2-5 kHz range. CONCLUSION: The transfer function of the human MIC, based on motion of the umbo and lenticularis, has been visualized and analyzed. While the magnitude of the transfer function decreases with frequency, its spatio-temporal complexity increases significantly. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT

show abstract

Errors in measurement of three-dimensional motions of the stapes using a Laser Doppler Vibrometer system

Cited by 11 publications

References 25 publications

Contribution of complex stapes motion to cochlea activation

Contribution of complex stapes motion to cochlea activation

Characterization of Stapes Anatomy: Investigation of Human and Guinea Pig

A method to measure sound transmission via the malleus–incus complex

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