Dr. Michael D. Twa Profile

Dr. Michael D. Twa

Professor at Univ of Houston

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Author

Publications (33)

Proceedings Article | 12 March 2024 Poster + Paper

Comparison of optical coherence elastography techniques, Brillouin spectroscopy, and ultrasound elastography on samples with varying stiffness

Andres Bryan, Manmohan Singh, Christian Zevallos Delgado, Sajedeh Saeidi Fard, Chaitanya Duvvuri, Michael Twa, Kirill Larin, Salavat Aglyamov, Achuth Nair

Proceedings Volume 12844, 128440B (2024) https://doi.org/10.1117/12.2692942

KEYWORDS: Elastography, Spectroscopy, Optical coherence tomography, Elasticity, Tissues, Optical coherence

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Proceedings Article | 5 March 2021 Presentation

Understanding the biomechanical role of limbus using optical coherence elastography

Manmohan Singh, Fernando Zvietcovich, Achuth Nair, Salavat Aglyamov, Michael Twa, Kirill Larin

Proceedings Volume 11645, 1164514 (2021) https://doi.org/10.1117/12.2579089

KEYWORDS: Sclera, Cornea, Elastography, Coherence (optics), Finite element methods, Wave propagation, Tissues, Phase velocity, Optical coherence tomography, Eye

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Proceedings Article | 5 March 2021 Presentation

Confocal air-coupled acoustic radiation force probe for the optical coherence elastography of tissues

Kirill Larin, Fernando Zvietcovich, Achuth Nair, Yogeshwari Ambekar, Manmohan Singh, Salavat Aglyamov, Michael Twa

Proceedings Volume 11645, 116450G (2021) https://doi.org/10.1117/12.2584510

KEYWORDS: Tissues, Tissue optics, Elastography, Confocal microscopy, Coherence (optics), Acoustics, Optical coherence tomography, Transducers, Wave propagation, Ultrasonics

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Proceedings Article | 5 March 2021 Presentation

Characterization of anisotropic tissues using micro air-pulse spatial deformation spreading

Fernando Zvietcovich, Manmohan Singh, Yogeshwari Ambekar, Salavat Aglyamov, Michael Twa, Kirill Larin

Proceedings Volume 11645, 116450W (2021) https://doi.org/10.1117/12.2579106

KEYWORDS: Tissues, Wave propagation, Tissue optics, Elastography, Anisotropy, Optical fibers, Optical coherence tomography, Near field optics, Near field, Natural surfaces

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Proceedings Article | 15 March 2018 Presentation

Optical elastography and applications in ocular biomechanics (Conference Presentation)

Michael Twa

Proceedings Volume 10496, 1049608 (2018) https://doi.org/10.1117/12.2295222

KEYWORDS: Tissue optics, Elastography, Optical engineering, Optical coherence tomography, Tissues

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Proceedings Article | 8 March 2018 Paper

Quantifying the effects of hydration on corneal stiffness with optical coherence elastography

Manmohan Singh, Jiasong Li, Srilatha Vantipalli, Zhaolong Han, Michael Twa, Kirill Larin, Salavat Aglyamov

Proceedings Volume 10474, 104740N (2018) https://doi.org/10.1117/12.2288433

KEYWORDS: Cornea, Finite element methods, Tissues, Coherence (optics), Elastography, Tissue optics, Biomedical optics, Ocean optics, Biomedical engineering, Collagen

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Proceedings Article | 8 March 2018 Paper

Ultra-high speed OCT allows measurement of intraocular pressure, corneal geometry, and corneal stiffness using a single instrument

Manmohan Singh, Zhaolong Han, Achuth Nair, Alexander Schill, Michael Twa, Kirill Larin

Proceedings Volume 10483, 1048319 (2018) https://doi.org/10.1117/12.2288450

KEYWORDS: Cornea, Optical coherence tomography, Elastography, Wave propagation, Tissue optics, Coherence (optics), Tissues, Biomedical engineering, In situ metrology, Ultrafast imaging

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Proceedings Article | 21 February 2017 Paper

Quantifying the effects of UV-A/riboflavin crosslinking on the elastic anisotropy and hysteresis of the porcine cornea by noncontact optical coherence elastography

Manmohan Singh, Jiasong Li, Raksha Raghunathan, Zhaolong Han, Achuth Nair, Chih-Hao Liu, Salavat Aglyamov, Michael Twa, Kirill Larin

Proceedings Volume 10067, 100670D (2017) https://doi.org/10.1117/12.2251680

KEYWORDS: Cornea, Anisotropy, Elastography, Tissue optics, Coherence (optics), Collagen, UV optics, Tissues, Wave propagation, Biomedical engineering

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SPIE Journal Paper | 20 February 2017 Open Access

Applanation optical coherence elastography: noncontact measurement of intraocular pressure, corneal biomechanical properties, and corneal geometry with a single instrument

Manmohan Singh, Zhaolong Han, Achuth Nair, Alexander Schill, Michael Twa, Kirill Larin

JBO, Vol. 22, Issue 02, 020502, (February 2017) https://doi.org/10.1117/12.10.1117/1.JBO.22.2.020502

KEYWORDS: Cornea, Optical coherence tomography, Elastography, Coherence (optics), Tissues, Wave propagation, Video, Control systems, Biomedical optics, Tissue optics

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Proceedings Article | 8 February 2017 Paper

Assessing the mechanical anisotropy and hysteresis while cycling IOP of porcine eyes before and after CXL by noncontact optical coherence elastography

Manmohan Singh, Jiasong Li, Zhaolong Han, Raksha Raghunathan, Achuth Nair, Chih-Hao Liu, Salavt Aglyamov, Michael Twa, Kirill Larin

Proceedings Volume 10045, 1004504 (2017) https://doi.org/10.1117/12.2253433

KEYWORDS: Anisotropy, Cornea, Coherence (optics), Elastography, Collagen, Tissue optics, Coherence imaging, Tissues, Optical imaging, Biomedical engineering, Eye

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Proceedings Article | 8 February 2017 Paper

Assessing corneal viscoelasticity after crosslinking at different IOP by noncontact OCE and a modified Lamb wave model

Zhaolong Han, Jiasong Li, Manmohan Singh, Chen Wu, Chih-hao Liu, Raksha Raghunathan, Salavat Aglyamov, Srilatha Vantipalli, Michael Twa, Kirill Larin

Proceedings Volume 10045, 1004502 (2017) https://doi.org/10.1117/12.2251784

KEYWORDS: Cornea, Coherence (optics), Elastography, Collagen, Eye models, Data modeling, Tissue optics, Tissues, Finite element methods, Therapeutics, Dispersion, Protactinium, Phase velocity

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SPIE Journal Paper | 5 January 2017 Open Access

Optical coherence elastography for evaluating customized riboflavin/UV-A corneal collagen crosslinking

Manmohan Singh, Jiasong Li, Srilatha Vantipalli, Zhaolong Han, Kirill Larin, Michael Twa

JBO, Vol. 22, Issue 09, 091504, (January 2017) https://doi.org/10.1117/12.10.1117/1.JBO.22.9.091504

KEYWORDS: Spatial resolution, Cornea, Tissues, Elastography, Optical coherence tomography, Collagen, Coherence (optics), Biomedical optics, In vivo imaging, Kinematics

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Proceedings Article | 9 March 2016 Presentation + Paper

Effect of curvature and thickness on elastic wave velocity in cornea-like structures by FEM and OCE

Srilatha Vantipalli, Michael Twa, Zhaolong Han, Jiasong Li, Manmohan Singh, Salavat Aglyamov, Chen Wu, Chih-hao Liu, Kirill Larin

Proceedings Volume 9710, 97100X (2016) https://doi.org/10.1117/12.2208626

KEYWORDS: Elastography, Finite element methods, Coherence (optics), Cornea, Tissue optics, Wave propagation, Contact lenses, Optical components, Spherical lenses, Tissues, Optical coherence tomography

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Proceedings Article | 9 March 2016 Presentation + Paper

Revealing anisotropic properties of cornea at different intraocular pressures using optical coherence elastography

Jiasong Li, Manmohan Singh, Zhaolong Han, Chen Wu, Salavat Aglyamov, Michael Twa, Achuth Nair, Kirill Larin

Proceedings Volume 9710, 97100T (2016) https://doi.org/10.1117/12.2213317

KEYWORDS: Cornea, Anisotropy, Elastography, Coherence (optics), Optical coherence tomography, Collagen, Mercury, In vivo imaging, Tissues, Wave propagation, Imaging systems, Control systems

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Proceedings Article | 8 March 2016 Presentation + Paper

Corneal elastic anisotropy and hysteresis as a function of IOP assessed by optical coherence elastography

Manmohan Singh, Chen Wu, Chih-Hao Liu, Achuth Nair, Kirill Larin, Shezaan Noorani, Salavat Aglyamov, Michael Twa, Jiasong Li, Zhaolong Han, Raksha Raghunathan

Proceedings Volume 9697, 96971N (2016) https://doi.org/10.1117/12.2213226

KEYWORDS: Anisotropy, Cornea, Coherence (optics), Elastography, Optical coherence tomography, Wave propagation, In vivo imaging, Tissues, Biomedical optics, Tissue optics, Collagen, Imaging systems

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Proceedings Article | 4 March 2016 Presentation + Paper

Influence of corneal hydration on optical coherence elastography

Michael Twa, Srilatha Vantipalli, Manmohan Singh, Jiasong Li, Kirill Larin

Proceedings Volume 9693, 96930V (2016) https://doi.org/10.1117/12.2210756

KEYWORDS: Tissues, Tissue optics, Elastography, Cornea, Natural surfaces, Coherence (optics), Optical coherence tomography, Coherence imaging, Eye, Soft tissue optics

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Proceedings Article | 4 March 2016 Paper

A comparison study of Riboflavin/UV-A and Rose-Bengal/Green light cross-linking of the rabbit corneas using optical coherence elastography

Jiasong Li, Manmohan Singh, Srilatha Vantipalli, Chih-Hao Liu, Chen Wu, Raksha Raghunathan, Michael Twa, Kirill Larin, Zhaolong Han, Tina Kazemi

Proceedings Volume 9693, 96931T (2016) https://doi.org/10.1117/12.2213395

KEYWORDS: Cornea, Coherence (optics), Elastography, Visualization, Collagen, Ultraviolet radiation, Optical coherence tomography, Absorbance, UV optics, Wave propagation, Phase velocity, Protactinium, Biomedical optics

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Proceedings Article | 4 March 2016 Presentation + Paper

Assessing the viscoelasticity of green light induced CXL in the rabbit cornea by noncontact OCE and FEM

Zhaolong Han, Jiasong Li, Manmohan Singh, Srilatha Vantipalli, Salavat Aglyamov, Chen Wu, Chih-hao Liu, Michael Twa, Kirill Larin

Proceedings Volume 9693, 96930X (2016) https://doi.org/10.1117/12.2208627

KEYWORDS: Cornea, Finite element methods, Collagen, Coherence (optics), Elastography, Wave propagation, Interfaces, Contact lenses, Tissues, Image processing, Optical coherence tomography

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Proceedings Article | 20 March 2015 Paper

Quantitative assessment of corneal biomechanical properties using optical coherence elastography and a modified Rayleigh Lamb-frequency model

Kirill Larin, Zhaolong Han, Jiasong Li, Manmohan Singh, Shang Wang, Srilatha Vantipalli, Chen Wu, Chih-hao Liu, Michael Twa, Salavat Aglyamov

Proceedings Volume 9307, 930719 (2015) https://doi.org/10.1117/12.2079542

KEYWORDS: Cornea, Phase velocity, Elastography, Coherence (optics), Geometrical optics, Optical coherence tomography, Tissues, Protactinium, Biological research, Wave propagation

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Proceedings Article | 20 March 2015 Paper

Three-dimensional mapping of corneal elasticity using optical coherence elastography

Manmohan Singh, Jiasong Li, Shang Wang, Srilatha Vantipalli, Michael Twa, Kirill Larin

Proceedings Volume 9307, 930718 (2015) https://doi.org/10.1117/12.2080066

KEYWORDS: Cornea, Elastography, Coherence (optics), Tissues, Wave propagation, Acoustics, Optical coherence tomography, Natural surfaces, Tissue optics, Collagen

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Proceedings Article | 6 March 2015 Paper

Noninvasive 3D elasticity mapping using phase-stabilized optical coherence elastography

Manmohan Singh, Jiasong Li, Shang Wang, Michael Twa, Kirill Larin

Proceedings Volume 9327, 932703 (2015) https://doi.org/10.1117/12.2078315

KEYWORDS: Tissues, Wave propagation, Elastography, Coherence (optics), Optical coherence tomography, Tissue optics, Cornea, Acoustics, Signal detection, Statistical analysis

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Proceedings Article | 6 March 2015 Paper

Assessment of the biomechanical properties of porcine cornea after UV cross-linking at different intraocular pressures

Kirill Larin, Jiasong Li, Manmohan Singh, Srilatha Vantipalli, Zhaolong Han, Chih-Hao Liu, Michael Twa

Proceedings Volume 9327, 93270Z (2015) https://doi.org/10.1117/12.2078328

KEYWORDS: Cornea, Optical coherence tomography, Tissues, Wave propagation, Tissue optics, Ultraviolet radiation, Elastography, Coherence (optics), Data modeling, Collagen

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Proceedings Article | 6 March 2015 Paper

Spatial mapping of the biomechanical properties of rabbit cornea after cross-linking using optical coherence elastography

Kirill Larin, Jiasong Li, Manmohan Singh, Srilatha Vantipalli, Zhaolong Han, Michael Twa

Proceedings Volume 9327, 93270S (2015) https://doi.org/10.1117/12.2078344

KEYWORDS: Cornea, Tissue optics, Optical coherence tomography, Elastography, Tissues, Coherence (optics), Collagen, Eye, Resistance, Spatial resolution

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Proceedings Article | 6 March 2015 Paper

Quantitative assessment of the mechanical properties of tissue-mimicking agar phantoms by optical coherence elastography and numerical analyses

Kirill Larin, Zhaolong Han, Jiasong Li, Manmohan Singh, Chen Wu, Chih-Hao Liu, Shang Wang, Narendran Sudheendran, Rita Idugboe, Michael Twa, Raksha Raghunathan, Salavat Aglyamov

Proceedings Volume 9327, 932710 (2015) https://doi.org/10.1117/12.2078466

KEYWORDS: Finite element methods, Tissues, Tissue optics, Elastography, Coherence (optics), Phase velocity, Natural surfaces, Numerical analysis, Data modeling, Spatial resolution

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Proceedings Article | 5 March 2015 Paper

Quantitative assessment of hyaline cartilage elasticity during optical clearing using optical coherence elastography

Chih-Hao Liu, Rita Idugboe, Jiasong Li, Manmohan Singh, Zhaolong Han, Chen Wu, Shang Wang, Valery Zakharov, Emil Sobol, Valery Tuchin, Michael Twa, Kirill Larin, Raksha Raghunathan

Proceedings Volume 9322, 93220B (2015) https://doi.org/10.1117/12.2079854

KEYWORDS: Cartilage, Optical coherence tomography, Tissue optics, Glucose, Optical clearing, Tissues, Biomedical optics, Elastography, Soft tissue optics, Coherence (optics)

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SPIE Journal Paper | 3 February 2015 Open Access

Quantitative assessment of corneal viscoelasticity using optical coherence elastography and a modified Rayleigh–Lamb equation

Zhaolong Han, Salavat Aglyamov, Jiasong Li, Manmohan Singh, Shang Wang, Srilatha Vantipalli, Chen Wu, Chih-hao Liu, Michael Twa, Kirill Larin

JBO, Vol. 20, Issue 02, 020501, (February 2015) https://doi.org/10.1117/12.10.1117/1.JBO.20.2.020501

KEYWORDS: Cornea, Elastography, Coherence (optics), Phase velocity, Geometrical optics, Tissues, Protactinium, Optical scanning systems, Natural surfaces, Biological research

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SPIE Journal Paper | 18 November 2014 Open Access

Differentiating untreated and cross-linked porcine corneas of the same measured stiffness with optical coherence elastography

Jiasong Li, Zhaolong Han, Manmohan Singh, Michael Twa, Kirill Larin

JBO, Vol. 19, Issue 11, 110502, (November 2014) https://doi.org/10.1117/12.10.1117/1.JBO.19.11.110502

KEYWORDS: Cornea, Elastography, Coherence (optics), Tissues, Signal attenuation, Optical testing, Collagen, Neodymium, Mercury, Phase measurement

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Proceedings Article | 28 February 2014 Paper

Air-puff OCE for assessment of mouse cornea in vivo

Jiasong Li, Shang Wang, Manmohan Singh, Salavat Aglyamov, Stanislav Emelianov, Michael Twa, Kirill Larin

Proceedings Volume 8930, 893004 (2014) https://doi.org/10.1117/12.2042258

KEYWORDS: Cornea, In vivo imaging, Tissues, Tissue optics, Elastography, Coherence (optics), Imaging systems, Biomedical optics, Soft tissue optics, Optical coherence tomography

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SPIE Journal Paper | 2 October 2013 Open Access

Dynamic optical coherence tomography measurements of elastic wave propagation in tissue-mimicking phantoms and mouse cornea in vivo

Jiasong Li, Shang Wang, Ravi Manapuram, Manmohan Singh, Floredes Menodiado, Salavat Aglyamov, Stanislav Emelianov, Michael Twa, Kirill Larin

JBO, Vol. 18, Issue 12, 121503, (October 2013) https://doi.org/10.1117/12.10.1117/1.JBO.18.12.121503

KEYWORDS: Cornea, In vivo imaging, Tissues, Optical coherence tomography, Wave propagation, Eye models, Tissue optics, Silicon, Optical testing, Eye

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Proceedings Article | 26 March 2013 Paper

Dynamic OCT measurements of corneal biomechanical properties after UV cross-linking in the rabbit

Michael Twa, Jiasong Li, Ravi Manapuram, Floredes Menodiado, Manmohan Singh, Salavat Aglyamov, Stanislav Emelianov, Kirill Larin

Proceedings Volume 8567, 85671G (2013) https://doi.org/10.1117/12.2007109

KEYWORDS: Tissues, Tissue optics, Elastography, Optical coherence tomography, Ultraviolet radiation, Cornea, Wave propagation, Eye, Coherence imaging, Collagen

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Proceedings Article | 20 March 2013 Paper

Combining a focused air-puff system with phase-sensitive optical coherence tomography for the detection of soft-tissue tumors based on elasticity measurement

Shang Wang, Jiasong Li, Ravi Kiran Manapuram, Davis Ingram, Michael Twa, Alexander Lazar, Dina Lev, Raphael Pollock, Kirill Larin, Srilatha Vantipalli

Proceedings Volume 8571, 85712B (2013) https://doi.org/10.1117/12.2007156

KEYWORDS: Tissues, Natural surfaces, Optical coherence tomography, Tumors, Transducers, Soft tissue optics, Tissue optics, Elastography, Biomedical optics, Wave propagation

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Proceedings Article | 20 March 2013 Paper

Dynamic OCE measurement of the biomechanical properties of gelatin phantom and mouse cornea in vivo

Kirill Larin, Jiasong Li, Ravi Kiran Manapuram, Floredes Menodiado, Manmohan Singh, Salavat Aglyamov, Stanislav Emelianov, Michael Twa, Shang Wang

Proceedings Volume 8571, 85711T (2013) https://doi.org/10.1117/12.2007033

KEYWORDS: Cornea, In vivo imaging, Tissues, Eye models, Wave propagation, Silicon, Eye, Tissue optics, Velocity measurements, Optical coherence tomography

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Proceedings Article | 9 March 2012 Paper

Estimation of surface wave propagation in mouse cornea

Kirill Larin, Phiet Truong, Stanislav Emelianov, Floredes Menodiado, Ravi Kiran Manapuram, Michael Twa, Salavat Aglyamov

Proceedings Volume 8209, 82090S (2012) https://doi.org/10.1117/12.909229

KEYWORDS: Cornea, Wave propagation, Tissues, Eye, Optical coherence tomography, Signal attenuation, Natural surfaces, Biological research, Tissue optics, Phase measurement

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Showing 5 of 33 publications

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