Articles that mention Nanjing University of Science and Technology -Optical Coherence Tomography News

Nanjing University of Science and Technology

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1. Mentioned In 30 Articles
2. Diagnosis and treatment evaluation of in-stent restenosis of carotid artery stenting using optical coherence tomography
  
  Explore Neurology Jan 9 2019 Cardiology , Neurology
  
  A 65-year-old man underwent balloon angioplasty and repeat carotid artery stenting (CAS) due to in-stent restenosis (ISR). Intravascular optical coherence tomography (OCT) showed a severe ISR with fibrotic neointimal growth ( figure 1 ). Post 6.0 30 mm balloon angioplasty, OCT showed intimal disruption and artery dissection ( figure 2 ). After the 8 40 mm stent fully expanded, OCT showed stent struts well apposed, but tissue protrusion from the spaces between stent ...
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  Mentions: Nanjing University of Science and Technology
3. Beam-shifting technique for speckle reduction and flow rate measurement in optical coherence tomography
  
  Explore OSA | OSA Publishing Dec 15 2018
  
  In this Letter, we propose a beam-shifting optical coherence tomography scheme for speckle reduction and blood flow rate calculation, where variations of the speckle pattern and Doppler angle were generated by parallel shifting of the sample beam incident on the objective lens. The resultant optical coherent tomography images could then be averaged for speckle noise reduction and simultaneously analyzed for flow rate measurement. The performance of the proposed technique was ...
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  Mentions: University of Toronto Sunnybrook Health Sciences Centre Victor X. D. Yang
4. Buffer-averaging super-continuum source based spectral domain optical coherence tomography for high speed imaging
  
  Explore OSA | OSA Publishing Nov 29 2018 Ophthalmology
  
  In super-continuum (SC) source based spectral domain optical coherence tomography (SC-SDOCT), the stability of the power spectral density (PSD) has a significant impact on OCT system sensitivity and image signal to noise ratio (SNR). High speed imaging decreases the camera's exposure time, thus each A-scan contained fewer laser pulse excited SC wideband emissions, resulting in a decrease of SNR. In this manuscript, we present a buffer-averaging SC-SDOCT (BASC-SDOCT) to ...
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  Mentions: University of Toronto Sunnybrook Health Sciences Centre Victor X. D. Yang
5. Automated segmentation of hyperreflective foci in spectral domain optical coherence tomography with diabetic retinopathy
  
  Explore SPIE Digital Library Feb 10 2018 Ophthalmology
  
  We propose an automated segmentation method to detect, segment, and quantify hyperreflective foci (HFs) in three-dimensional (3-D) spectral domain optical coherence tomography (SD-OCT). The algorithm is divided into three stages: preprocessing, layer segmentation, and HF segmentation. In this paper, a supervised classifier (random forest) was used to produce the set of boundary probabilities in which an optimal graph search method was then applied to identify and produce the layer segmentation ...
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  Mentions: Nanjing University of Science and Technology
6. Automatic Subretinal Fluid Segmentation of Retinal SD-OCT Images With Neurosensory Retinal Detachment Guided by Enface Fundus Imaging
  
  Explore IEEE Xplore Dec 22 2017 Ophthalmology
  
  Objective: Accurate segmentation of neurosensory retinal detachment (NRD) associated subretinal fluid in spectral domain optical coherence tomography (SD-OCT) is vital for the assessment of central serous chorioretinopathy (CSC). A novel two-stage segmentation algorithm was proposed, guided by Enface fundus imaging. Methods: In the first stage, Enface fundus image was segmented using thickness map prior to detecting the fluid-associated abnormalities with diffuse boundaries. In the second stage, the locations of the ...
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  Mentions: Sungkyunkwan University Nanjing University of Science and Technology
7. Quantitative measurement of subsurface damage with self-referenced spectral domain optical coherence tomography
  
  Explore OSA | OSA Publishing Oct 22 2017 NDE/NDT
  
  In this work, we present the three-dimensional reconstruction of the subsurface damage (SSD) within the optical components at the level of several microns with a self-referenced spectral domain optical coherence tomography (SDOCT) system, from which the quantitative information, including the maximum depth, the cluster depth, the shape, the size and the damage density, can be acquired. First, to compare the actual maximum depths with the ones computed by the formulas ...
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  Mentions: Wanrong Gao Nanjing University of Science and Technology
8. In vivo assessment of macula in eyes of healthy children 8 to 16 years old using optical coherence tomography angiography
  
  Explore Nature Publishing Group Sep 1 2017 Ophthalmology
  
  The purpose of the present study was to investigate the vascular flow density (VD) of macular superficial (SCP), deep capillary plexus (DCP), and choriocapillaris and the size of the foveal avascular zone (FAZ) area in healthy children using optical coherence tomography angiography (OCTA). The potential associations of age, sex, intraocular pressure, body mass index, spherical equivalent, and axial length with OCTA parameters were also investigated. A total of 75 eyes ...
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  Mentions: Nanjing University of Science and Technology
9. Optimization of linear-wavenumber spectrometer for high-resolution spectral domain optical coherence tomography
  
  Explore ScienceDirect Aug 30 2017
  
  Nonlinear detection of the spectral interferograms in wavenumber ( k ) space degrades the depth-dependent signal sensitivity in conventional linear-in- spectrometer based spectral domain optical coherence tomography (SDOCT). Linear- k spectrometer enables high sensitivity SDOCT imaging without the need of resampling the digitized non-linear-in- k data. Here we report an effective optimization method for linear- k spectrometer used in a high-resolution SDOCT system. The design parameters of the linear- k spectrometer, including ...
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  Mentions: Nanjing University of Science and Technology
10. Quantitative depth resolved microcirculation imaging with optical coherence tomography angiography (Part Ι): Blood flow velocity imaging
  
  Explore Wiley Online Library Apr 20 2017
  
  The research goal of the microvascular network imaging with optical coherence tomography (OCT) angiography is to achieve depth resolved blood flow and vessel imaging in vivo in the clinical management of patents. In this review, we review the main phenomena that have been explored in OCT to image the blood flow velocity vector and the vessels of the microcirculation within living tissues. Parameters that limit the accurate measurements of blood ...
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  Mentions: Wanrong Gao Nanjing University of Science and Technology
11. Quantitative depth resolved microcirculation imaging with optical coherence tomography angiography (Part ΙΙ): Microvascular network imaging
  
  Explore Wiley Online Library Apr 20 2017
  
  In this work, we review the main phenomena that have been explored in OCT angiography to image the vessels of the microcirculation within living tissues with the emphasis on how the different processing algorithms were derived to circumvent specific limitations. Parameters are then discussed that can quantitatively describe the depth-resolved microvascular network for possible clinic diagnosis applications. Finally,future directions in continuing OCT development are discussed.
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  Mentions: Wanrong Gao Nanjing University of Science and Technology
12. High speed, wide velocity dynamic range Doppler optical coherence tomography (Part V): Optimal utilization of multi-beam scanning for Doppler and speckle variance microvascular imaging
  
  Explore OSA | OSA Publishing Apr 1 2017
  
  In this paper, a multi-beam scanning technique is proposed to optimize the microvascular images of human skin obtained with Doppler effect based methods and speckle variance processing. Flow phantom experiments were performed to investigate the suitability for combining multi-beam data to achieve enhanced microvascular imaging. To our surprise, the highly variable spot sizes (ranging from 13 to 77 m) encountered in high numerical aperture multi-beam OCT system imaging the same ...
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  Mentions: University of Toronto Sunnybrook Health Sciences Centre Victor X. D. Yang
13. Multi-beam optical coherence tomography for microvascular imaging of human skin in vivo
  
  Explore Conference Proceedings Feb 22 2017 Dermatology
  
  In this paper, a multi-beam optical coherence tomography (OCT) was used to reconstruct the microvascular image of human skin in vivo with phase resolved Doppler OCT (PRDOCT), phase resolved Doppler variance (PRDV) and speckle variance OCT (svOCT), in which the blood flow image was calculated by averaging the four blood flow images obtained by the four beams. In PRDOCT method, it is difficult to detect the blood flow perpendicular to ...
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  Mentions: Victor X. D. Yang Ryerson University Wanrong Gao
14. Differential standard deviation of log-scale intensity based optical coherence tomography angiography
  
  Explore Wiley Online Library Jan 30 2017
  
  In this paper, a differential standard deviation of log-scale intensity (DSDLI) based optical coherence tomography angiography (OCTA) is presented for calculating microvascular images of human skin. The DSDLI algorithm calculates the variance in difference images of two consecutive log-scale intensity based structural images from the same position along depth direction to contrast blood flow. The en face microvascular images were then generated by calculating the standard deviation of the differential ...
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  Mentions: University of Toronto Victor X. D. Yang Ryerson University
15. Dispersion analysis in micron resolution spectral domain optical coherence tomography
  
  Explore OSA | OSA Publishing Dec 16 2016
  
  One of the main factors that limits the effective axial resolution of spectral domain optical coherence tomography in live tissue imaging is tissue-induced dispersion. In this work, first the methods are reviewed that have been proposed to compensate for the dispersion effects in various applications. Simple formulas are then derived that can be used to estimate the orders of the dispersion that may have significant influences. The formulas are then ...
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  Mentions: Wanrong Gao Nanjing University of Science and Technology
16. Fractal analysis of en face tomographic images obtained with full field optical coherence tomography
  
  Explore Wiley Online Library Nov 15 2016
  
  The quantitative modeling of the imaging signal of pathological areas and healthy areas is necessary to improve the specificity of diagnosis with tomographic en face images obtained with full field optical coherence tomography (FFOCT). In this work, we propose to use the depth-resolved change in the fractal parameter as a quantitative specific biomarker of the stages of disease. The idea is based on the fact that tissue is a random ...
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  Mentions: Wanrong Gao Nanjing University of Science and Technology
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