Articles that mention Yan Li -Optical Coherence Tomography News

Yan Li

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1. Mentioned In 65 Articles
2. Keratoconus Detection using OCT Corneal and Epithelial Thickness Map Parameters and Patterns
  
  Explore LWW Online Nov 13 2020 Ophthalmology
  
  Purpose: To detect keratoconus using optical coherence tomography (OCT) corneal map parameters and patterns. Setting: Casey Eye Institute, Oregon Health Science University, Portland, Oregon, USA DESIGN:: Cross-sectional observational study. Methods: A spectral-domain OCT was used to acquire corneal and epithelial thickness maps in normal, manifest keratoconic, subclinical keratoconic, and forme fruste keratoconic (FFK) eyes. A two-step decision tree was designed. An eye will be classified as keratoconus if both decision ...
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  Mentions: David Huang Oregon Health & Science University Center for Ophthalmic Optics and Lasers
3. A Coincident Thinning Index for Keratoconus Identification Using OCT Pachymetry and Epithelial Thickness Maps
  
  Explore Healio.com Nov 12 2020 Ophthalmology
  
  PURPOSE: To develop a coincident thinning (CTN) index to differentiate between keratoconic and healthy corneas using optical coherence tomography (OCT) measurements of pachymetry and epithelial thickness. METHODS: Pattern deviation maps of pachymetry and epithelial thickness were generated using Fourier-domain OCT images of the cornea. The co-localized thinning of the two maps was quantified using a novel CTN index, which was calculated from Gaussian fits of the regions of maximum relative ...
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  Mentions: David Huang Oregon Health & Science University Center for Ophthalmic Optics and Lasers
4. Advances in Doppler optical coherence tomography and angiography
  
  Explore Wiley Online Library Oct 4 2020
  
  Since the first demonstration of Doppler optical coherence tomography (OCT) in 1997, several functional extensions of Doppler OCT have been developed, including velocimetry, angiogram, and optical coherence elastography. These functional techniques have been widely used in research and clinical applications, particularly in ophthalmology. Here, we review the principles, representative methods, and applications of different Doppler OCT techniques, followed by discussion on the innovations, limitations, and future directions of each of ...
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  Mentions: Zhongping Chen UC Irvine Yan Li
5. Oregon Health & Science University Receives NIH Grant for Optical Coherence Tomography Differential Diagnosis and Treatment of Irregular Corneas
  
  Explore Optical Coherence Tomography News Jul 28 2020 Ophthalmology , Funding
  
  ...Coherence Tomography Differential Diagnosis and Treatment of Irregular Corneas. The principal investigator is Yan Li. Below is a summary of the proposed work.
  
  To see well, the cornea m...
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  Mentions: National Institutes of Health Oregon Health & Science University Yan Li
6. Ultrahigh-sensitive optical coherence elastography
  
  Explore Nature Publishing Group Apr 13 2020
  
  The phase stability of an optical coherence elastography (OCE) system is the key determining factor for achieving a precise elasticity measurement, and it can be affected by the signal-to-noise ratio (SNR), timing jitters in the signal acquisition process, and fluctuations in the optical path difference (OPD) between the sample and reference arms. In this study, we developed an OCE system based on swept-source optical coherence tomography (SS-OCT) with a common-path ...
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  Mentions: Zhongping Chen UC Irvine Yan Li
7. Bulk motion subtraction in optical coherence tomography angiography
  
  Explore uspto.gov Mar 17 2020 Ophthalmology , Patents
  
  Described herein is an algorithm to remove decorrelation noise due to bulk motion in optical coherence tomography angiography (OCTA). OCTA B-frames are divided into segments within which the bulk motion velocity could be assumed constant. This velocity is recovered using linear regression of decorrelation versus the logarithm of reflectance in axial lines (A-lines) identified as bulk tissue by percentile analysis. The fitting parameters are used to calculate a reflectance-adjusted threshold ...
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  Mentions: David Huang Oregon Health & Science University Yali Jia
8. Optical Vaginal Biopsy Using Optical Coherence Tomography
  
  Explore LWW Online Feb 10 2020 Gynecology
  
  Objective Optical coherence tomography is a noninvasive technology that visualizes tissue microstructure with high spatial resolution. We designed a novel vaginal system that demonstrates a clear distinction between vaginal tissues planes. In this study, we sought to compare vaginal tomographic images of premenopausal, perimenopausal, and postmenopausal women, demonstrate feasibility of tracking vaginal tissue changes after treatment with fractional-pixel CO 2 laser therapy, and obtain a histologic correlation of these findings ...
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  Mentions: Zhongping Chen UC Irvine Yan Li
9. Early Diagnostic Value of Optical Coherence Tomography in The Clinical Prediction Model for Optic Nerve Injury in Saddle Space Occupying Patients
  
  Explore ScienceDirect Jan 14 2020 Ophthalmology
  
  In this study, 50 patients with anterior ischemic optic neuropathy due to saddle block were selected as the experimental group, and 50 healthy subjects were used as the control group to conduct a study. The best corrected visual acuity examination, optical coherence tomography and visual evoked potential examination were performed on the two groups. The results of the study showed that the majority of patients were middle-aged and older people ...
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  Mentions: Yan Li
10. In vivo evaluation of posterior eye elasticity using shaker-based optical coherence elastography
  
  Explore SAGE Journals Jan 12 2020 Ophthalmology
  
  Age-related macular degeneration (AMD) is a progressive retinal disease and becomes the leading cause of blindness. It is well established that early detection is the key to preservation of functional vision. However, it is very difficult to diagnose AMD in very early stages, before structural changes are evident. Consequently, investigating the biomechanical properties of the retina maybe essential for understanding its physiological function. In this study, we present a shear ...
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  Mentions: Zhongping Chen University of Southern California UC Irvine
11. Application of Corneal Optical Coherence Tomography Angiography for Assessment of Vessel Depth in Corneal Neovascularization
  
  Explore LWW Online Dec 28 2019 Ophthalmology
  
  Purpose: To map and measure the depths of corneal neovascularization (NV) using 3-dimensional optical coherence tomography angiography (OCTA) at 2 different wavelengths. Methods: Corneal NV of varying severity, distribution, and underlying etiology was examined. Average NV depth and vessel density were measured using 840-nm spectral-domain OCTA and 1050-nm swept-source OCTA. The OCTA results were compared with clinical slit-lamp estimation of NV depth. Results: Twelve eyes with corneal NV from 12 ...
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  Mentions: Massachusetts Institute of Technology James G. Fujimoto David Huang
12. Cerebral edema detection in vivo after middle cerebral artery occlusion using swept-source optical coherence tomography
  
  Explore SPIE Digital Library Nov 12 2019 Neurology
  
  Cerebral edema is a severe complication of ischemic cerebrovascular disease, which can lead to microcirculation compression resulting in additional ischemic damage. Real-time and continuous in vivo imaging techniques for edema detection are of great significance to basic research on cerebral edema. We attempted to monitor the cerebral edema status in rats with middle cerebral artery occlusion (MCAO) over time, using a wide field-of-view swept-source optical coherence tomography (SS-OCT) system. Optical ...
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  Mentions: University of Michigan Yan Li
13. OHSU Receives NIH Grant ffor Optical Coherence Tomography-Aided Differential Diagnosis and Treatment of Irregular Corneas
  
  Explore Optical Coherence Tomography News May 7 2019 Ophthalmology , Funding
  
  ...nce Tomography-Aided Differential Diagnosis and Treatment of Irregular Corneas. The principal investigator is Yan Li. The program began in 2018 and ends in 2023. Below is a summary of the proposed work.
  
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  Mentions: National Institutes of Health Oregon Health & Science University Yan Li
14. Multimodal endoscopy for colorectal cancer detection by optical coherence tomography and near-infrared fluorescence imaging
  
  Explore OSA | OSA Publishing Apr 20 2019 Gastroenterology
  
  While colonoscopy is the gold standard for diagnosis and classification of colorectal cancer (CRC), its sensitivity and specificity are operator-dependent and are especially poor for small and flat lesions. Contemporary imaging modalities, such as optical coherence tomography (OCT) and near-infrared (NIR) fluorescence, have been investigated to visualize microvasculature and morphological changes for detecting early stage CRC in the gastrointestinal (GI) tract. In our study, we developed a multimodal endoscopic system ...
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  Mentions: Zhongping Chen UC Irvine Yan Li
15. Visual Optics Postdoctoral/Research Fellow Opening at Oregon Health & Science University
  
  Explore Optical Coherence Tomography News Mar 14 2019 Ophthalmology , Jobs & Studentships
  
  ... independently and with team members. To apply, please contact Professors David Huang ( huangd@ohsu.edu ) and Yan Li ( liyan@ohsu.edu ). A postdoctoral research fellow position is available in the Center for Ophthalmic O...
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  Mentions: National Institutes of Health David Huang Oregon Health & Science University
16. 1.7 micron optical coherence tomography for vaginal tissue characterization in vivo
  
  Explore Wiley Online Library Jul 30 2018 Gynecology
  
  Objectives Optical coherence tomography (OCT) can noninvasively visualize in vivo tissue microstructure with high spatial resolution that approaches the histologic level. Currently, OCT studies in gynecology are few and limited to a conventional 1.3m center wavelength swept light source which provides high spatial resolution but limited penetration depth. Here, we present a novel endoscopic OCT system with improved penetration depth and high resolution. Methods A novel endoscopic OCT system ...
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  Mentions: Zhongping Chen UC Irvine Yan Li
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