Assessing the Biomechanical Properties of Cornea using Optical Coherence Elastography

dc.contributor.advisorLarin, Kirill V.
dc.contributor.committeeMemberAkay, Metin
dc.contributor.committeeMemberTwa, Michael D.
dc.contributor.committeeMemberGifford, Howard C.
dc.contributor.committeeMemberWood, Lowell T.
dc.creatorLi, Jiasong
dc.creator.orcid0000-0002-8828-1729 2016 2016
dc.description.abstractThis dissertation reports on the development of measurement methods to assess the biomechanical properties of cornea based on low-coherence optical imaging, focusing on optical coherence elastographic techniques, to meet the growing demand for noninvasive high-resolution tissue characterization with improved diagnosis and treatment of ocular diseases. The research work was based on optical coherence tomography (OCT), a rapid, high-resolution, three-dimensional imaging modality that enables noninvasive depth-resolved imaging. The dissertation work is summarized in seven sections: 1) characterization the biomechanical properties of tissue mimicking phantoms, an ocular phantom, and mouse cornea in vivo using optical coherence elastography (OCE); 2) assessment the biomechanical properties of mouse corneas of different ages in vivo using air-pulse OCE; 3) the development of a method to spatially map the localized elasticity of the rabbit cornea in situ after partial riboflavin/UV-A corneal collagen cross-linking using OCE; 4) rapid characterization of the biomechanical properties of porcine corneas before and after UV-induced collagen cross-liking at different intraocular pressures by OCE; 5) the development of method to differentiate untreated and cross-linked porcine corneas of the same measured stiffness with OCE; 6) evaluation of the effects of Riboflavin/UV-A corneal collagen crosslinking on porcine corneal mechanical anisotropy with noncontact OCE; 7) a comparison of two non-contact methods to assess mechanical properties of tissue mimicking phantoms: optical coherence elastography and Michelson interferometric vibrometry. These techniques, methods and applications are demonstrated with the experiments performed on tissue mimicking phantoms (gelatin, agar, and silicone) and corneas (mouse, rabbit, porcine, both ex vivo, in situ, and in vivo) under different conditions (normal vs. cross-linking, various intraocular pressures, etc.). This dissertation represents the frontier and emerging research area of optical coherence elastography and is expected to contribute to the field of biomechanical assessment with research and clinical based applications.
dc.description.departmentBiomedical Engineering, Department of
dc.format.digitalOriginborn digital
dc.identifier.citationPortions of this document appear in: Li, Jiasong, Shang Wang, M. Singh, S. Aglyamov, S. Emelianov, M. D. Twa, and Kirill V. Larin. "Air-pulse OCE for assessment of age-related changes in mouse cornea in vivo." Laser Physics Letters 11, no. 6 (2014): 065601. And in: Li, Jiasong, Shang Wang, Ravi Kiran Manapuram, Manmohan Singh, Floredes M. Menodiado, Salavat Aglyamov, Stanislav Y. Emelianov, Michael D. Twa, and Kirill V. Larin. "Dynamic optical coherence tomography measurements of elastic wave propagation in tissue-mimicking phantoms and mouse cornea in vivo." Journal of biomedical optics 18, no. 12 (2013): 121503. And in: Li, Jiasong, Zhaolong Han, Manmohan Singh, Michael D. Twa, and Kirill V. Larin. "Differentiating untreated and cross-linked porcine corneas of the same measured stiffness with optical coherence elastography." Journal of biomedical optics 19, no. 11 (2014): 110502. And in: Li, Jiasong, C-H. Liu, Alexander Schill, Manmohan Singh, Achuth Nair, Valery P. Zakharov, and Kirill V. Larin. "Assessing mechanical properties of tissue phantoms with non-contact optical coherence elastography and Michelson interferometric vibrometry." Journal of Biomedical Photonics & Engineering 1, no. 4 (2015).
dc.rightsThe author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. UH Libraries has secured permission to reproduce any and all previously published materials contained in the work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s).
dc.subjectoptical coherence tomography, optical coherence elastography, cornea, cornea elastography, non-invasive, non-contact.
dc.titleAssessing the Biomechanical Properties of Cornea using Optical Coherence Elastography
dc.type.genreThesis College of Engineering Engineering, Department of Engineering of Houston of Philosophy


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