1
|
Quince Z, Alonso-Caneiro D, Read SA, Collins MJ. Static compression optical coherence elastography to measure the mechanical properties of soft contact lenses. BIOMEDICAL OPTICS EXPRESS 2021; 12:1821-1833. [PMID: 33996200 PMCID: PMC8086445 DOI: 10.1364/boe.419344] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Revised: 02/12/2021] [Accepted: 02/23/2021] [Indexed: 06/12/2023]
Abstract
In this study, a novel method was developed for estimating the elastic modulus (Young's modulus) of soft contact lens materials using static compression optical coherence elastography. Using a commercially available spectral domain optical coherence tomography instrument, an experimental setup was developed to image a soft contact lens sample before and during compression with a known applied force, from which the lens material's mechanical properties can be derived. A semi-automatic segmentation method using graph-search theory and dynamic processing was used to trace the lens boundaries and to determine key structural changes within the images. To validate the method, five soft contact lens materials with a range of known elastic moduli and water contents were tested. The proposed method was successful in estimating the Young's modulus in the five different soft contact lens materials. It was demonstrated that the method provides highly repeatable measurements, with an intraclass correlation coefficient of >95%. The Young's modulus results were compared to published manufacturer data with no significant difference for four out of the five materials (p > 0.05). These results demonstrate that a static compression optical coherence tomography method can reliably measure the elastic modulus of soft contact lenses. This provides a methodology that can be used to explore in vitro contact lens mechanical properties, but more importantly, may also be extended to study the mechanical characteristics of in vivo or ex vivo tissue, provided that they can be imaged using OCT.
Collapse
|
2
|
Giannios P, Koutsoumpos S, Toutouzas KG, Matiatou M, Zografos GC, Moutzouris K. Complex refractive index of normal and malignant human colorectal tissue in the visible and near-infrared. JOURNAL OF BIOPHOTONICS 2017; 10:303-310. [PMID: 27091794 DOI: 10.1002/jbio.201600001] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2016] [Revised: 03/07/2016] [Accepted: 03/30/2016] [Indexed: 05/07/2023]
Abstract
A multi-wavelength prism coupling refractometer is utilized to measure the angular reflectance of freshly excised human intestinal tissue specimens. Based on reflectance data, the real and imaginary part of the refractive index is calculated via Fresnel analysis for three visible (blue, green, red) and two near-infrared (963 nm and 1551 nm) wavelengths. Averaged values of the complex refractive index and corresponding Cauchy dispersion fits are given for the mucosa, submucosa and serosa layers of the colorectal wall at the normal state. The refractive constants of tumorous and normal mucosa are then cross-compared for the indicative cases of one patient diagnosed with a benign polyp and three patients diagnosed with adenocarcinomas of different phenotype. Significant index contrast exists between the normal and diseased states, indicating the potential use of refractive index as a marker of colorectal dysplasia.
Collapse
Affiliation(s)
- Panagiotis Giannios
- Laboratory of Electronic Devices and Materials, Department of Electronic Engineering, Technological Educational Institute of Athens, Athens, 12210, Greece
| | - Spyridon Koutsoumpos
- Laboratory of Electronic Devices and Materials, Department of Electronic Engineering, Technological Educational Institute of Athens, Athens, 12210, Greece
| | - Konstantinos G Toutouzas
- First Department of Propaedeutic Surgery, Hippocration Hospital, Athens Medical School, National and Kapodistrian University of Athens, Athens, 11525, Greece
| | - Maria Matiatou
- First Department of Propaedeutic Surgery, Hippocration Hospital, Athens Medical School, National and Kapodistrian University of Athens, Athens, 11525, Greece
| | - George C Zografos
- First Department of Propaedeutic Surgery, Hippocration Hospital, Athens Medical School, National and Kapodistrian University of Athens, Athens, 11525, Greece
| | - Konstantinos Moutzouris
- Laboratory of Electronic Devices and Materials, Department of Electronic Engineering, Technological Educational Institute of Athens, Athens, 12210, Greece
| |
Collapse
|
3
|
Jin X, Deng Z, Wang J, Ye Q, Mei J, Zhou W, Zhang C, Tian J. Study of the inhibition effect of thiazone on muscle optical clearing. JOURNAL OF BIOMEDICAL OPTICS 2016; 21:105004. [PMID: 27768200 DOI: 10.1117/1.jbo.21.10.105004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Accepted: 09/28/2016] [Indexed: 06/06/2023]
Abstract
We investigated the effect of thiazone, a widely used penetration enhancer, on in vitro porcine skin and muscle tissue by single-integrating sphere technique during optical clearing (OC) treatment. The results showed that thiazone induced an increase on the total transmittance of skin which led to a reduction in that of muscle in the spectral range from 400 to 800 nm. Small particles crystalized out from the thiazone-treated muscle were observed by microscopy imaging. With the help of x-ray diffraction measurement, we ascertained that the crystal was a single-crystal of thiazone, which mainly induced an increase of the scattering. Contrast transmittance measurements carried on the mixture of water, thizaone–propylene glycol solution showed that the free water in muscle could be the main reason for the thiazone crystallization. Therefore, during OC treatment of thiazone, the remarkable effect on skin and the noticeable inhibition effect on subcutaneous muscle tissue after penetrating into the skin should be considered. The experimental results provide such a reference for the choice of penetration enhancer.
Collapse
Affiliation(s)
- Xiaowei Jin
- Nankai University, School of Physics and TEDA Applied Physics School, Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, 94th Weijin Road, Tianjin 300071, ChinabNankai University, The 2011 Project Collaborative Innovation Center for Biological Therapy, 94th Weijin Road, Tianjin 300071, China
| | - Zhichao Deng
- Nankai University, School of Physics and TEDA Applied Physics School, Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, 94th Weijin Road, Tianjin 300071, ChinabNankai University, The 2011 Project Collaborative Innovation Center for Biological Therapy, 94th Weijin Road, Tianjin 300071, China
| | - Jin Wang
- Nankai University, School of Physics and TEDA Applied Physics School, Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, 94th Weijin Road, Tianjin 300071, ChinabNankai University, The 2011 Project Collaborative Innovation Center for Biological Therapy, 94th Weijin Road, Tianjin 300071, China
| | - Qing Ye
- Nankai University, School of Physics and TEDA Applied Physics School, Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, 94th Weijin Road, Tianjin 300071, ChinabNankai University, The 2011 Project Collaborative Innovation Center for Biological Therapy, 94th Weijin Road, Tianjin 300071, China
| | - Jianchun Mei
- Nankai University, The 2011 Project Collaborative Innovation Center for Biological Therapy, 94th Weijin Road, Tianjin 300071, ChinacNankai University, Advanced Technology Institute, 94th Weijin Road, Tianjin 300071, China
| | - Wenyuan Zhou
- Nankai University, School of Physics and TEDA Applied Physics School, Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, 94th Weijin Road, Tianjin 300071, ChinabNankai University, The 2011 Project Collaborative Innovation Center for Biological Therapy, 94th Weijin Road, Tianjin 300071, China
| | - Chunping Zhang
- Nankai University, School of Physics and TEDA Applied Physics School, Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, 94th Weijin Road, Tianjin 300071, ChinabNankai University, The 2011 Project Collaborative Innovation Center for Biological Therapy, 94th Weijin Road, Tianjin 300071, China
| | - Jianguo Tian
- Nankai University, School of Physics and TEDA Applied Physics School, Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, 94th Weijin Road, Tianjin 300071, ChinabNankai University, The 2011 Project Collaborative Innovation Center for Biological Therapy, 94th Weijin Road, Tianjin 300071, China
| |
Collapse
|
4
|
Giannios P, Toutouzas KG, Matiatou M, Stasinos K, Konstadoulakis MM, Zografos GC, Moutzouris K. Visible to near-infrared refractive properties of freshly-excised human-liver tissues: marking hepatic malignancies. Sci Rep 2016; 6:27910. [PMID: 27297034 PMCID: PMC4906272 DOI: 10.1038/srep27910] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Accepted: 05/20/2016] [Indexed: 02/07/2023] Open
Abstract
The refractive index is an optical constant that plays a significant role in the description of light-matter interactions. When it comes to biological media, refraction is understudied despite recent advances in the field of bio-optics. In the present article, we report on the measurement of the refractive properties of freshly excised healthy and cancerous human liver samples, by use of a prism-coupling technique covering the visible and near-infrared spectral range. Novel data on the wavelength-dependent complex refractive index of human liver tissues are presented. The magnitude of the real and imaginary part of the refractive index is correlated with hepatic pathology. Notably, the real index contrast is pointed out as a marker of discrimination between normal liver tissue and hepatic metastases. In view of the current progress in optical biosensor technologies, our findings may be exploited for the development of novel surgical and endoscopic tools.
Collapse
Affiliation(s)
- Panagiotis Giannios
- Laboratory of Electronic Devices and Materials, Department of Electronic Engineering, Technological Educational Institution of Athens, Athens, Greece
| | - Konstantinos G Toutouzas
- First Department of Propaedeutic Surgery, Hippocration Hospital, Athens Medical School, Athens, Greece
| | - Maria Matiatou
- First Department of Propaedeutic Surgery, Hippocration Hospital, Athens Medical School, Athens, Greece
| | - Konstantinos Stasinos
- First Department of Propaedeutic Surgery, Hippocration Hospital, Athens Medical School, Athens, Greece
| | - Manousos M Konstadoulakis
- First Department of Propaedeutic Surgery, Hippocration Hospital, Athens Medical School, Athens, Greece
| | - George C Zografos
- First Department of Propaedeutic Surgery, Hippocration Hospital, Athens Medical School, Athens, Greece
| | - Konstantinos Moutzouris
- Laboratory of Electronic Devices and Materials, Department of Electronic Engineering, Technological Educational Institution of Athens, Athens, Greece
| |
Collapse
|