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

Nanjing University of Science and Technology

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2. CT texture analysis of vulnerable plaques on optical coherence tomography
  
  Explore Home Page Jan 24 2021 Cardiology
  
  Purpose: To explore whether CT texture analysis can identify thin-cap fibroatheroma (TCFA) determined by optical coherence tomography (OCT). Methods: Thirty-three patients with 43 lesions who underwent both CCTA and OCT within 3 months were retrospectively included. 12 conventional CT-derived plaque features, fat attenuation index (FAI) and 1691 plaque radiomics features were extracted to discriminate TCFA lesions and non-TCFA lesions determined by OCT. Minimum redundancy and maximum relevance (mRMR) method was ...
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  Mentions: Nanjing University of Science and Technology
3. An optimized segmentation and quantification approach in microvascular imaging for OCTA-based neovascular regression monitoring
  
  Explore BMC Medical Imaging Jan 24 2021 Ophthalmology
  
  Background: Quantification of neovascularization changes in terms of neovascular complex (NVC) acquired from the optical coherence tomography angiography (OCTA) imaging is extremely important for diagnosis and treatment monitoring of proliferative diabetic retinopathy (PDR). However, only few vessel extraction methods have so far been reported to quantify neovascular changes in NVC with proliferative diabetic retinopathy PDR based on OCTA images. Methods: Here we propose an optimized approach to segment blood vessels ...
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  Mentions: Nanjing University of Science and Technology
4. Image Projection Network: 3D to 2D Image Segmentation in OCTA Images
  
  Explore IEEE Xplore Oct 29 2020 Ophthalmology
  
  We present an image projection network (IPN), which is a novel end-to-end architecture and can achieve 3D-to-2D image segmentation in optical coherence tomography angiography (OCTA) images. Our key insight is to build a projection learning module (PLM) which uses a unidirectional pooling layer to conduct effective features selection and dimension reduction concurrently. By combining multiple PLMs, the proposed network can input 3D OCTA data, and output 2D segmentation results such ...
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  Mentions: Nanjing University of Science and Technology
5. Superficial Calcification With Rotund Shape Is Associated With Carotid Plaque Rupture: An Optical Coherence Tomography Study
  
  Explore Frontiers Oct 21 2020 Cardiology
  
  Background: Plaque rupture is an important etiology for symptomatic carotid stenosis. The role of calcification in the plaque vulnerability has been controversial. We aimed to detect the geometric features of calcifications in carotid plaque and to examine its association with plaque rupture. Methods: Optical coherence tomography assessment of carotid plaque was performed in 88 patients. Calcification shape was evaluated through quantitative measurements of the long and short axis, area size ...
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  Mentions: Capital Medical University Nanjing University of Science and Technology
6. A theoretical model for the micron resolution spectral domain optical coherence tomography
  
  Explore ScienceDirect Sep 29 2020
  
  The resolution and effective imaging depth (EID) of spectral domain optical coherence tomography (OCT) are of great importance for visualizing the fine details of biological tissues. To this end, a theoretical model for the micron resolution spectral domain OCT was proposed with both the temporal coherence and the longitudinal spatial coherence considered. Based on the model, the parameters that influence the axial resolution, the signal intensity and the EID can ...
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  Mentions: Wanrong Gao Nanjing University of Science and Technology
7. Fast and Automated Hyperreflective Foci Segmentation Based on Image Enhancement and Improved 3D U-Net in SD-OCT Volumes with Diabetic Retinopathy
  
  Explore TVST Journal Aug 22 2020 Ophthalmology
  
  Purpose : To design a robust and automated hyperreflective foci (HRF) segmentation framework for spectral-domain optical coherence tomography (SD-OCT) volumes, especially volumes with low HRF-background contrast. Methods : HRF in retinal SD-OCT volumes appear with low-contrast characteristics that results in the difficulty of HRF segmentation. Therefore to effectively segment the HRF we proposed a fully automated method for HRF segmentation in SD-OCT volumes with diabetic retinopathy (DR). First, we generated the enhanced ...
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  Mentions: Nanjing University of Science and Technology
8. Point spread function degradation model of a polarization imaging system for wide-field subwavelength nanoparticles
  
  Explore OSA | OSA Publishing Aug 10 2020
  
  We propose a comprehensive point spread function (PSF) degradation model, which considers multiple factors consisting of degradation of specimen retardant sampling and polarization angularly anamorphic sampling, to indicate the image degradation characteristics of polarization imaging systems. First, a one-layer optical coherence tomography (OCT) model was established to express the retardancy of medium-loading specimens. Then, a PSF degradation model of angularly anamorphic polarization sampling was deduced through the retrieval of Stokes ...
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  Mentions: Nanjing University of Science and Technology
9. Cooperative low-rank models for removing stripe noise from OCTA images
  
  Explore IEEE Xplore Aug 7 2020 Ophthalmology
  
  Optical coherence tomography angiography (OCTA) is an emerging non-invasive imaging technique for imaging the microvasculature of the eye based on phase variance or amplitude decorrelation derived from repeated OCT images of the same tissue area. Stripe noise occurs during the OCTA acquisition process due to the involuntary movement of the eye. To remove the stripe noise (or 'destriping') effectively, we propose two novel image decomposition models to simultaneously destripe all ...
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  Mentions: Yalin Zheng Nanjing University of Science and Technology
10. Measurement of optic axis orientation with single-mode fiber-based polarization-sensitive optical coherence tomography
  
  Explore SPIE Digital Library May 31 2020
  
  An algorithm is presented that can be used to obtain accurate optic axis orientation of birefringent tissue samples. A single-mode fiber (SMF)-based polarization-sensitive optical coherence tomography with a single linearly polarized incident light was used in the measurements in which the light reflected from the sample and detected by the spectrometer is linearly polarized light at 45 deg with respect to the experimental horizontal axis. By employing polarization controllers ...
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  Mentions: Wanrong Gao Nanjing University of Science and Technology
11. Ticagrelor versus clopidogrel for prevention of subclinical stent thrombosis detected by optical coherence tomography in patients with drug-eluting stent implantation—a multicenter and randomized study
  
  Explore Taylor & Francis Online Apr 28 2020 Cardiology
  
  Introduction : This prospective, multicenter, randomized study was designed to analyze the benefits of ticagrelor over clopidogrel in reducing subclinical stent thrombosis (ST) in patients with coronary artery disease who underwent implantation of a second-generation drug-eluting stent (DES). Methods : About 352 patients with single de novo coronary stenosis were randomly assigne`d to either clopidogrel group (aspirin plus clopidogrel) or ticagrelor group (aspirin plus ticagrelor) after DES implantation for 1 year ...
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  Mentions: Zhejiang University Nanjing University of Science and Technology
12. Miniaturized precalibration-based Lissajous scanning fiber probe for high speed endoscopic optical coherence tomography
  
  Explore OSA | OSA Publishing Apr 14 2020 Gastroenterology , Probes
  
  We present a miniaturized precalibration-based forward-viewing Lissajous scanning fiber probe for high speed endoscopic optical coherence tomography (OCT). The probe is based on an asymmetric fiber cantilever driven by the piezoelectric bender to realize two-dimensional (2D) Lissajous scanning. The stability and repeatability of the Lissajous scanning trajectory of the probe is tested by a position sensitive detector (PSD)-based position calibration setup. The two orthogonal resonant frequencies of the cantilever ...
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  Mentions: Nanjing University of Science and Technology
13. Optical coherence tomography evaluation of vertebrobasilar artery stenosis: case series and literature review
  
  Explore jnis.bmj.com Feb 22 2020 Cardiology , Neurology
  
  Background Intracranial vertebrobasilar artery stenosis is an important cause of ischemic stroke. With its high resolution, intravascular optical coherence tomography (OCT) provides detailed assessment of vessel wall features. It is widely applied to identify high-risk plaque in the cardiovascular system, but its use in the intracranial artery has been limited. Objective To explore, in this pilot study, the usefulness of OCT in imaging of the intracranial artery wall. Methods Between ...
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  Mentions: Nanjing University of Science and Technology
14. FFOCT imaging based on compressed sensing
  
  Explore IOPscience Jan 9 2020
  
  With the demand for high-resolution images, the storage space occupied by the images of the full-field optical coherence tomography (FFOCT) system is becoming more and more intensified. How to reduce the data volume of high-resolution image systems has become a research hotspot in the image processing industry. In particular, precision medicine requires high-resolution images of organs and tissues, and this data storage system requires a large storage space. For this ...
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  Mentions: Nanjing University of Science and Technology
15. Cholesterol Crystals are Associated with Carotid Plaque Vulnerability: An Optical Coherence Tomography Study
  
  Explore ScienceDirect Dec 19 2019 Cardiology
  
  Objective: Vulnerable carotid plaque is associated with cerebrovascular events. Cholesterol crystals are often seen in the atherosclerotic plaques. However, the potential role of cholesterol crystals in carotid plaques destabilization is unknown. We aimed to identify the association between cholesterol crystals and carotid plaque vulnerability. Methods: Optical coherence tomography assessment of carotid plaque was performed in 95 patients. Clinical characteristics and plaque morphology were examined. The differences in plaque characteristics (thrombus ...
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  Mentions: Nanjing University of Science and Technology
16. Gabor optical coherence tomographic angiography (GOCTA) (Part II): theoretical basis of sensitivity improvement and optimization for processing speed
  
  Explore OSA | OSA Publishing Dec 13 2019
  
  We previously proposed a Gabor optical coherence tomography angiography (GOCTA) algorithm for spectral domain optical coherence tomography (SDOCT) to extract microvascular signals from spectral fringes directly, with speed improvement of 4 to 20 times over existing methods. In this manuscript, we explored the theoretical basis of GOCTA with comparison of experimental data using solid and liquid displacement sample targets, demonstrating that the majority of the GOCTA sensitivity advantage over speckle ...
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  Mentions: University of Toronto Sunnybrook Health Sciences Centre Victor X. D. Yang
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