Measuring mechanical wave speed, dispersion, and viscoelastic modulus of the cornea using optical coherence elastography

Acoustic wave velocity measurement based on optical coherence tomography (OCT) is a promising approach to assess the mechanical properties of biological tissues and soft materials. While studies to date have demonstrated proof of concept of different ways to excite and detect mechanical waves, the q...

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Bibliographic Details
Published in:Optics express 2019-06, Vol.27 (12), p.16635-16649
Main Authors: Ramier, Antoine, Tavakol, Behrouz, Yun, Seok-Hyun
Format: Article
Language:English
Subjects:
Animals
Cornea - physiology
Elastic Modulus
Elasticity Imaging Techniques - methods
Models, Theoretical
Silicone Elastomers - chemistry
Swine
Tomography, Optical Coherence - methods
Viscosity
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Summary:Acoustic wave velocity measurement based on optical coherence tomography (OCT) is a promising approach to assess the mechanical properties of biological tissues and soft materials. While studies to date have demonstrated proof of concept of different ways to excite and detect mechanical waves, the quantitative performance of this modality as mechanical measurement has been underdeveloped. Here, we investigate the frequency dependent measurement of the wave propagation in viscoelastic tissues, using a piezoelectric point-contact probe driven with various waveforms. We found that a frequency range of 2-10 kHz is a good window for corneal elastography, in which the lowest-order flexural waves can be identified in post processing. We tested our system on tissue-simulating phantoms and ex vivo porcine eyes, and demonstrate reproducibility and inter-sample variability. Using the Kelvin-Voigt model of viscoelasticity, we extracted the shear-elastic modulus and viscosity of the cornea and their correlation with the corneal thickness, curvature, and eyeball mass. Our results show that our method can be a quantitative, useful tool for the mechanical analysis of the cornea.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.27.016635