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High-Resolution Shear Wave Imaging of the Human Cornea Using a Dual-Element Transducer

Estimating the corneal elasticity can provide valuable information for corneal pathologies and treatments. Ophthalmologic pathologies will invariably cause changes to the elasticity of the cornea. For example, keratoconus and the phototoxic effects of ultraviolet radiation usually increase the corne...

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Autores principales: Chen, Pei-Yu, Shih, Cho-Chiang, Lin, Wei-Chen, Ma, Teng, Zhou, Qifa, Shung, K. Kirk, Huang, Chih-Chung
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6308409/
https://www.ncbi.nlm.nih.gov/pubmed/30513950
http://dx.doi.org/10.3390/s18124244
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author Chen, Pei-Yu
Shih, Cho-Chiang
Lin, Wei-Chen
Ma, Teng
Zhou, Qifa
Shung, K. Kirk
Huang, Chih-Chung
author_facet Chen, Pei-Yu
Shih, Cho-Chiang
Lin, Wei-Chen
Ma, Teng
Zhou, Qifa
Shung, K. Kirk
Huang, Chih-Chung
author_sort Chen, Pei-Yu
collection PubMed
description Estimating the corneal elasticity can provide valuable information for corneal pathologies and treatments. Ophthalmologic pathologies will invariably cause changes to the elasticity of the cornea. For example, keratoconus and the phototoxic effects of ultraviolet radiation usually increase the corneal elasticity. This makes a quantitative estimation of the elasticity of the human cornea important for ophthalmic diagnoses. The present study investigated the use of a proposed high-resolution shear wave imaging (HR-SWI) method based on a dual-element transducer (comprising an 8-MHz element for pushing and a 32-MHz element for imaging) for measuring the group shear wave velocity (GSWV) of the human cornea. An empirical Young’s modulus formula was used to accurately convert the GSWV to Young’s modulus. Four quantitative parameters, bias, resolution, contrast, and contrast-to-noise ratio (CNR), were measured in gelatin phantoms with two different concentrations (3% and 7%) to evaluate the performance of HR-SWI. The biases of gelatin phantoms (3% and 7%) were 5.88% and 0.78%, respectively. The contrast and CNR were 0.76, 1.31 and 3.22, 2.43 for the two-side and two-layer phantoms, respectively. The measured image resolutions of HR-SWI in the lateral and axial directions were 72 and 140 μm, respectively. The calculated phase SWV (PSWV) and their corresponding Young’s modulus from six human donors were 2.45 ± 0.48 m/s (1600 Hz) and 11.52 ± 7.81 kPa, respectively. All the experimental results validated the concept of HR-SWI and its ability for measuring the human corneal elasticity.
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spelling pubmed-63084092019-01-04 High-Resolution Shear Wave Imaging of the Human Cornea Using a Dual-Element Transducer Chen, Pei-Yu Shih, Cho-Chiang Lin, Wei-Chen Ma, Teng Zhou, Qifa Shung, K. Kirk Huang, Chih-Chung Sensors (Basel) Article Estimating the corneal elasticity can provide valuable information for corneal pathologies and treatments. Ophthalmologic pathologies will invariably cause changes to the elasticity of the cornea. For example, keratoconus and the phototoxic effects of ultraviolet radiation usually increase the corneal elasticity. This makes a quantitative estimation of the elasticity of the human cornea important for ophthalmic diagnoses. The present study investigated the use of a proposed high-resolution shear wave imaging (HR-SWI) method based on a dual-element transducer (comprising an 8-MHz element for pushing and a 32-MHz element for imaging) for measuring the group shear wave velocity (GSWV) of the human cornea. An empirical Young’s modulus formula was used to accurately convert the GSWV to Young’s modulus. Four quantitative parameters, bias, resolution, contrast, and contrast-to-noise ratio (CNR), were measured in gelatin phantoms with two different concentrations (3% and 7%) to evaluate the performance of HR-SWI. The biases of gelatin phantoms (3% and 7%) were 5.88% and 0.78%, respectively. The contrast and CNR were 0.76, 1.31 and 3.22, 2.43 for the two-side and two-layer phantoms, respectively. The measured image resolutions of HR-SWI in the lateral and axial directions were 72 and 140 μm, respectively. The calculated phase SWV (PSWV) and their corresponding Young’s modulus from six human donors were 2.45 ± 0.48 m/s (1600 Hz) and 11.52 ± 7.81 kPa, respectively. All the experimental results validated the concept of HR-SWI and its ability for measuring the human corneal elasticity. MDPI 2018-12-03 /pmc/articles/PMC6308409/ /pubmed/30513950 http://dx.doi.org/10.3390/s18124244 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Chen, Pei-Yu
Shih, Cho-Chiang
Lin, Wei-Chen
Ma, Teng
Zhou, Qifa
Shung, K. Kirk
Huang, Chih-Chung
High-Resolution Shear Wave Imaging of the Human Cornea Using a Dual-Element Transducer
title High-Resolution Shear Wave Imaging of the Human Cornea Using a Dual-Element Transducer
title_full High-Resolution Shear Wave Imaging of the Human Cornea Using a Dual-Element Transducer
title_fullStr High-Resolution Shear Wave Imaging of the Human Cornea Using a Dual-Element Transducer
title_full_unstemmed High-Resolution Shear Wave Imaging of the Human Cornea Using a Dual-Element Transducer
title_short High-Resolution Shear Wave Imaging of the Human Cornea Using a Dual-Element Transducer
title_sort high-resolution shear wave imaging of the human cornea using a dual-element transducer
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6308409/
https://www.ncbi.nlm.nih.gov/pubmed/30513950
http://dx.doi.org/10.3390/s18124244
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