Transient Response of the Eardrum Excited by Localized Mechanical Forces

Razavi, Payam; Dobrev, Ivo; Ravicz, Michael E.; Cheng, Jeffery Tao; Furlong, Cosme; Rosowski, John J.

doi:10.1007/978-3-319-21455-9_4

Cited by 5 publications

(5 citation statements)

References 10 publications

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“…1a), which includes a continuous-wave (CW) 532 nm laser (SLIM-532, 50mW; Oxxius, O'Fallon, MO, USA), variable ratio beam splitter, an optical phase shifter, a high-speed camera (SA5 1000k; Photron, San Diego, CA, USA), and beam combining and imaging optics (Razavi et al, 2015a). …”

Section: Methodsmentioning

confidence: 99%

“…High-speed acquisition was achieved by a novel high-speed 2+N frame acquisition method (Razavi et al, 2015a) based on a hybrid spatio-temporal local correlation (LC) phase sampling approach (Dobrev et al 2014a, b, c), that allows quantification of the TM transient deformations by utilizing two reference frames and N consecutive deformed frames recorded before and throughout the evolution of the event of interest. The high-speed camera capabilities allow for frame rates from 7 000 frames per second (fps) at full resolution (i.e., 10 6 pixels) to 10 6 fps at reduced resolutions (i.e.…”

Section: Methodsmentioning

confidence: 99%

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Response of the human tympanic membrane to transient acoustic and mechanical stimuli: Preliminary results

et al. 2016

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The response of the tympanic membrane (TM) to transient environmental sounds and the contributions of different parts of the TM to middle-ear sound transmission were investigated by measuring the TM response to global transients (acoustic clicks) and to local transients (mechanical impulses) applied to the umbo and various locations on the TM. A lightly-fixed human temporal bone was prepared by removing the ear canal, inner ear, and stapes, leaving the incus, malleus, and TM intact. Motion of nearly the entire TM was measured by a digital holography system with a high speed camera at a rate of 42 000 frames per second, giving a temporal resolution of <24 μs for the duration of the TM response. The entire TM responded nearly instantaneously to acoustic transient stimuli, though the peak displacement and decay time constant varied with location. With local mechanical transients, the TM responded first locally at the site of stimulation, and the response spread approximately symmetrically and circumferentially around the umbo and manubrium. Acoustic and mechanical transients provide distinct and complementary stimuli for the study of TM response. Spatial variations in decay and rate of spread of response imply local variations in TM stiffness, mass, and damping.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Response of the human tympanic membrane to transient acoustic and mechanical stimuli: Preliminary results

et al. 2016

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“…The displacement fields normal to the surface under observation were obtained using DHI, where the sensi- Other reports on vibration analysis of objects and biological membranes are worth of consideration [35][36][37][38][39][40][41][42][43][44][45][46]. The tympanic membrane's (TM) motion is very important in the hearing process, serving as a transformer of mechanical impedance between low impedance in the air in the ear channel, and the high impedance at the center of the eardrum and the umbo.…”

Section: Working Principlementioning

confidence: 99%

Macro to nano specimen measurements using photons and electrons with digital holographic interferometry: a review

Hernández-Montes

Mendoza-Santoyo

Moreno

et al. 2020

J. Eur. Opt. Soc.-Rapid Publ.

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Today digital holographic interferometry (DHI) is considered a modern full-field non-destructive technique that allows generating 3D quantitative data of a wide variety of specimens. There are diverse optical setups for DHI that enable the study of specimens in static and dynamic conditions: it is a viable alternative to characterize a wide diversity of parameters in the micro and macro world by conducting repeatable, reliable and accurate measurements that render specimen data, e.g., displacements, shape, spatial dimensions, physiological conditions, refractive indices, and vibration responses. This paper presents a review and progress on the most significant topics, contributions and applications involving DHI for the study of different specimens such as: cells, bio tissues, grains, insects, and nano-structures. For most of the research work involving macro and micro specimens the wave-like source used in the measurements were photons from a laser, while the studies carried out in the nano regime used the wave-like nature of the electron.

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“…and high sensitivity of the optical tools. Researchers utilized a high-speed digital holographic method to minimize these undesirable effects and made quantitative measurements on live subjects possible [24,[27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

High-Speed Holographic Shape and Full-Field Displacement Measurements of the Tympanic Membrane in Normal and Experimentally Simulated Pathological Ears

et al. 2019

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To improve the understanding of the middle-ear hearing mechanism and assist in the diagnosis of middle-ear diseases, we are developing a high-speed digital holographic (HDH) system to measure the shape and acoustically-induced transient displacements of the tympanic membrane (TM). In this paper, we performed measurements on cadaveric human ears with simulated common middle-ear pathologies. The frequency response function (FRF) of the normalized displacement by the stimulus (sound pressure) at each measured pixel point of the entire TM surface was calculated and the complex modal indicator function (CMIF) of the middle-ear system based on FRFs of the entire TM surface motions was used to differentiate different middle-ear pathologies. We also observed changes in the TM shape and the surface motion pattern before and after various middle-ear manipulations. The observations of distinguishable TM shapes and motion patterns in both time and frequency domains between normal and experimentally simulated pathological ears support the development of a quantitative clinical holography-based apparatus for diagnosing middle-ear pathologies.

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Transient Response of the Eardrum Excited by Localized Mechanical Forces

Cited by 5 publications

References 10 publications

Response of the human tympanic membrane to transient acoustic and mechanical stimuli: Preliminary results

Response of the human tympanic membrane to transient acoustic and mechanical stimuli: Preliminary results

Macro to nano specimen measurements using photons and electrons with digital holographic interferometry: a review

High-Speed Holographic Shape and Full-Field Displacement Measurements of the Tympanic Membrane in Normal and Experimentally Simulated Pathological Ears

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