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 36 Articles
2. Diagnostic accuracy of intracoronary optical coherence tomography-derived fractional flow reserve for assessment of coronary stenosis severity
  
  Explore eurointervention.pcronline.com Jun 6 2019 Cardiology
  
  $Diagnostic accuracy of intracoronary optical coherence tomography-derived fractional flow reserve for assessment of coronary stenosis severity$
  ims: A novel method for computation of fractional flow reserve (FFR) from optical coherence tomography (OCT) was developed recently. This study aimed to evaluate the diagnostic accuracy of a new OCT-based FFR (OFR) computational approach, using wire-based FFR as the reference standard. Methods and results: Patients who underwent both OCT and FFR prior to intervention were analysed. The lumen of the interrogated vessel and the ostia of the side branches ...
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  Mentions: Case Western Reserve University Capital Medical University Shanghai Jiao Tong University
3. OCT angiography-based monitoring of neovascular regression on fibrovascular membrane after preoperative intravitreal conbercept injection
  
  Explore Home - Springer May 9 2019 Ophthalmology
  
  Purpose To quantify the preoperative neovascular change pattern on the fibrovascular membrane (FVM) within 7 days after intravitreal injection of conbercept (IVC) using optical coherence tomography angiography (OCTA) in proliferative diabetic retinopathy (PDR). Methods Prospective, observational study of PDR patients with visible FVM receiving or not receiving IVC. Neovascular changes were assessed by OCTA pre-IVC and 1, 3, 5, and 7 days post-IVC. Vessel skeleton density (SD) and vessel density ...
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  Mentions: Nanjing University of Science and Technology
4. 2D MEMS-based high-speed beam-shifting technique for speckle noise reduction and flow rate measurement in optical coherence tomography
  
  Explore OSA | OSA Publishing Apr 23 2019
  
  In this manuscript, a two-dimensional (2D) micro-electro-mechanical system (MEMS)-based, high-speed beam-shifting spectral domain optical coherence tomography (MHB-SDOCT) is proposed for speckle noise reduction and absolute flow rate measurement. By combining a zigzag scanning protocol, the frame rates of 45.2 Hz for speckle reduction and 25.6 Hz for flow rate measurement are achieved for in-vivo tissue imaging. Phantom experimental results have shown that by setting the incident beam ...
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  Mentions: University of Toronto Sunnybrook Health Sciences Centre Victor X. D. Yang
5. Measurement and compensation of motion artifacts in spectral domain optical coherence tomography
  
  Explore ScienceDirect Feb 13 2019
  
  Spectral domain optical coherence tomography (SDOCT) has the capability of generating optical sectioning images at high depth resolution in vivo, which is helpful for the diagnosis of various disease. But when the voluntary and involuntary movement of the sample occurs during the acquisition time, the real structure of the sample will be distorted. So it is valuable to compensate the motion artifacts in SDOCT imaging to obtain high quality images ...
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  Mentions: Nanjing University of Science and Technology
6. All single-mode fiber-based polarization-sensitive spectral domain optical coherence tomography system
  
  Explore IOPscience Jan 28 2019
  
  We reported an all single-mode fiber (SMF)-based polarization sensitive spectral domain optical coherence tomography (PSSDOCT) system with single input polarization state (IPS). In our design, polarization state was modulated only by four polarization controllers (PC) and a polarization beam splitter. To extract the phase retardance and optical axis orientation of sample, the Mueller matrix of the fiber system and sample is transferred to a new retardar by employing PCs ...
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  Mentions: Nanjing University of Science and Technology
7. Single-shot wavelength-independent phase-shifting method for full-field optical coherence tomography
  
  Explore OSA | OSA Publishing Jan 18 2019
  
  One limitation of a piezoelectric translator-based phase-shifting method in full-field optical coherence tomography (FF-OCT) is that there exist interference residuals because a light source with broadband is used. In this work, an achromatic phase-shifting method was proposed in which a linear polarizer and a quarter-wave plate were employed to generate the circularly polarized light in the reference arm of a basic Linnik interferometer. The light field reflected from the reference ...
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  Mentions: Nanjing University of Science and Technology
8. 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
9. 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
10. 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
11. 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
12. 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
13. 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
14. 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
15. 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
16. 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
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