High-Speed Shape and Transient Response Measurements of Tympanic Membrane

Razavi, Payam; Tang, Haimi; Maftoon, Nima; Rosowski, John J.; Furlong, Cosme; Cheng, Jeffrey

doi:10.1007/978-3-319-97481-1_33

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…9, using knowledge of the shape and orientation, the surface normal (n) and sensitivity vectors (K) are computed at each point of the TM surface with respect to the displacement measurement coordinate system. This information is sufficient to determine the magnitude of the surface normal displacement as well as the surface normal displacement vector (L) 44,47 E Q -T A R G E T ; t e m p : i n t r a l i n k -; e 0 0 5 ; 3 2 6 ; 4 3 1…”

Section: Determination Of Surface-normal Displacements Along the Tympmentioning

confidence: 99%

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Combined high-speed holographic shape and full-field displacement measurements of tympanic membrane

et al. 2018

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The conical shape of the tympanic membrane (TM or eardrum) plays an important role in its function, such that variations in shape alter the acoustically induced motions of the TM. We present a method that precisely determines both shape and acoustically induced transient response of the entire TM using the same optics and maintaining the same coordinate system, where the TM transient displacements due to a broadband acoustic click excitation (50-μs impulse) and the shape are consecutively measured within <200 ms. Interferograms gathered with continuous high-speed (>2 kHz) optical phase sampling during a single 100-ms wavelength tuning ramp allow precise and rapid reconstructions of the TM shape at varied resolutions (50 to 200 μm). This rapid acquisition of full-field displacements and shape is immune to slow disturbances introduced by breathing or heartbeat of live subjects. Knowledge of TM shape and displacements enables the estimation of surface normal displacements regardless of the orientation of the TM within the measurement system. The proposed method helps better define TM mechanics and provides TM structure and function information useful for the diagnosis of ear disease.

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Section: Determination Of Surface-normal Displacements Along the Tympmentioning

confidence: 99%

“…Schematics of optical path length difference of a thin-shell having dominant out-of-plane displacements. Δϕ is the interference phase due to displacements, K ¼ k 2 − k 1 is the sensitivity vector, L is the displacements vector, and n is the surface normal vector at the point zp 47. Journal of Biomedical Optics 031008-6 March 2019 • Vol 24…”

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Combined high-speed holographic shape and full-field displacement measurements of tympanic membrane

et al. 2018

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High-Speed Digital Image Correlation for Endoscopy: A Feasibility Study

Tang

Pooladvand

Razavi

et al. 2018

Advancement of Optical Methods &Amp; Digital Image Correlation in Experimental Mechanics, Volume 3

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Inaccuracies of deterministic finite-element models of human middle ear revealed by stochastic modelling

Ebrahimian

Mohammadi

Rosowski

et al. 2023

Sci Rep

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For over 40 years, finite-element models of the mechanics of the middle ear have been mostly deterministic in nature. Deterministic models do not take into account the effects of inter-individual variabilities on middle-ear parameters. We present a stochastic finite-element model of the human middle ear that uses variability in the model parameters to investigate the uncertainty in the model outputs (umbo, stapes, and tympanic-membrane displacements). We demonstrate: (1) uncertainties in the model parameters can be magnified by more than three times in the umbo and stapes footplate responses at frequencies above 2 kHz; (2) middle-ear models are biased and they distort the output distributions; and (3) with increased frequency, the highly-uncertain regions spatially spread out on the tympanic membrane surface. Our results assert that we should be mindful when using deterministic finite-element middle-ear models for critical tasks such as novel device developments and diagnosis.

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High-Speed Shape and Transient Response Measurements of Tympanic Membrane

Cited by 3 publications

References 6 publications

Combined high-speed holographic shape and full-field displacement measurements of tympanic membrane

Combined high-speed holographic shape and full-field displacement measurements of tympanic membrane

High-Speed Digital Image Correlation for Endoscopy: A Feasibility Study

Inaccuracies of deterministic finite-element models of human middle ear revealed by stochastic modelling

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