Articles that mention Chinese Academy of Sciences -Optical Coherence Tomography News

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2. A simple system of swept source optical coherence tomography for a large imaging depth range
  
  Explore ScienceDirect Sep 11 2018
  
  In swept source optical coherence tomography (SSOCT), the imaging depth range sometimes limits its application, such as the whole eye measurement. The methods of extending depth range usually need to redesign the system or add some additional devices. In this paper, we propose a simple system of SSOCT for a large imaging depth range. The system is the same as the original SSOCT with using the swept source clock signal ...
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  Mentions: Osami Sasaki Xiangzhao Wang Chinese Academy of Sciences
3. Optical Coherence Tomography Examination in Myocardial Infarction
  
  Explore Home - ClinicalTrials.gov Jul 20 2018 Cardiology , Clinical Trials
  
  Acute myocardial infarction (AMI), which results from coronary artery occlusion due to thrombosis, remains the leading cause of death and disability worldwide. Pathological studies have demonstrated that plaque rupture accompanied by subsequent thrombus formation is the main mechanism responsible for AMI, accounting for approximately two thirds of cases; the remaining approximately one third of cases are the result of plaque erosion. Moreover, previous studies showed that the risk of cardiovascular ...
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  Mentions: Chinese Academy of Sciences
4. Three-dimensional graph-based skin layer segmentation in optical coherence tomography images for roughness estimation
  
  Explore OSA | OSA Publishing Jul 10 2018 Dermatology
  
  Automatic skin layer segmentation in optical coherence tomography (OCT) images is important for a topographic assessment of skin or skin disease detection. However, existing methods cannot deal with the problem of shadowing in OCT images due to the presence of hair, scales, etc. In this work, we propose a method to segment the topmost layer of the skin (or the skin surface) using 3D graphs with a novel cost function ...
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  Mentions: Chinese Academy of Sciences
5. Optical Coherence Tomography Substudy of A Prospective Multicenter Randomized Post-Market Trial to Assess the Safety and Effectiveness of the Firehawk™ Rapamycin Target Eluting Cobalt Chromium Coronary Stent System for the Treatment of Atherosclerotic Les
  
  Explore eurointervention.org Jun 15 2018 Cardiology
  
  Aims: Durable polymer drug-eluting stents (DP DES) may contribute to persistent inflammation, delayed endothelial healing and subsequent late DES thrombosis. The aim of this Optical Coherence Tomography (OCT) sub-study was to compare healing and neointimal coverage of a novel bioabsorbable polymer sirolimus-eluting stent (FIREHAWK) (BP DES) versus the DP DES (XIENCE) at 90 days in an all comers patient population. Methods and results: The TARGET All Comers study is a ...
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  Mentions: University of London Patrick W. Serruys Chinese Academy of Sciences
6. Automatic analysis of bioresorbable vascular scaffolds in intravascular optical coherence tomography images
  
  Explore OSA | OSA Publishing May 5 2018 Cardiology
  
  The bioresorbable vascular scaffold (BVS) is a new generation of bioresorbable scaffold (BRS) for the treatment of coronary artery disease. A potential challenge of BVS is malapposition, which may possibly lead to late stent thrombosis. It is therefore important to conduct malapposition analysis right after stenting. Since an intravascular optical coherence tomography (IVOCT) image sequence contains thousands of BVS struts, manual analysis is labor intensive and time consuming. Computer-based automatic ...
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  Mentions: Chinese Academy of Sciences Shanghai Jiao Tong University
7. Near-infrared and mid-infrared semiconductor broadband light emitters
  
  Explore Nature Publishing Group Apr 27 2018 Broadband Sources
  
  Semiconductor broadband light emitters have emerged as ideal and vital light sources for a range of biomedical sensing/imaging applications, especially for optical coherence tomography systems. Although near-infrared broadband light emitters have found increasingly wide utilization in these imaging applications, the requirement to simultaneously achieve both a high spectral bandwidth and output power is still challenging for such devices. Owing to the relatively weak amplified spontaneous emission, as a consequence ...
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  Mentions: University of Sheffield Chinese Academy of Sciences Richard A. Hogg
8. Passively Driven Probe Based on Miniaturized Propeller for Intravascular Optical Coherence Tomography
  
  Explore Nature Publishing Group Apr 16 2018 Cardiology , Probes
  
  Optical coherent tomography (OCT) has enabled clinical applications ranging from ophthalmology to cardiology that revolutionized in vivo medical diagnostics in the last few decades, and a variety of endoscopic probes have been developed in order to meet the needs of various endoscopic OCT imaging. We propose a passive driven intravascular optical coherent tomography (IV-OCT) probe in this paper. Instead of using any electrically driven scanning device, the probe makes use ...
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  Mentions: Osami Sasaki Xiangzhao Wang Chinese Academy of Sciences
9. Novel Photoacoustic Microscopy and Optical Coherence Tomography Dual-modality Chorioretinal Imaging in Living Rabbit Eyes
  
  Explore jove.com Mar 24 2018
  
  Photoacoustic ocular imaging is an emerging ophthalmic imaging technology that can noninvasively visualize ocular tissue by converting light energy into sound waves and is currently under intensive investigation. However, most reported work to date is focused on the imaging of the posterior segment of the eyes of small animals, such as rats and mice, which poses challenges for clinical human translation due to small eyeball sizes. This manuscript describes a ...
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  Mentions: University of Michigan Chinese Academy of Sciences Peking University
10. Evaluation of marginal gap of lithium disilicate glass ceramic crowns with optical coherence tomography
  
  Explore SPIE Digital Library Mar 4 2018 Dentistry
  
  arginal gap (MG) was the most important factor to evaluate the success of crowns. The study was to assess the MG of lithium disilicate glass ceramic crowns with spectral domain optical coherence tomography (OCT) and stereomicroscopy in vitro , and to provide evidence to measure the MG with OCT. Consistency was observed between OCT and stereomicroscopy to measure the MG after cementation. There was no significant difference between the MG of ...
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  Mentions: Capital Medical University Chinese Academy of Sciences Peking University
11. Automatic Lumen Segmentation in Intravascular Optical Coherence Tomography Images Using Level Set
  
  Explore Hindawi Publishing Corporation Jan 4 2018 Cardiology
  
  Automatic lumen segmentation from intravascular optical coherence tomography (IVOCT) images is an important and fundamental work for diagnosis and treatment of coronary artery disease. However, it is a very challenging task due to irregular lumen caused by unstable plaque and bifurcation vessel, guide wire shadow, and blood artifacts. To address these problems, this paper presents a novel automatic level set based segmentation algorithm which is very competent for irregular lumen ...
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  Mentions: Chinese Academy of Sciences Shanghai Jiao Tong University
12. Automatic spectral calibration for polarization-sensitive optical coherence tomography
  
  Explore OSA | OSA Publishing Sep 24 2017
  
  Accurate wavelength assignment is important for Fourier domain polarizationsensitive optical coherence tomography. Incorrect wavelength mapping between the orthogonal horizontal (H) and vertical (V) polarization channels leads to broadening the axial point spread function and generating polarization artifacts. To solve the problem, we propose an automatic spectral calibration method by seeking the optimal calibration coefficient between wavenumber kH and kV. The method first performs a rough calibration to get the relationship ...
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  Mentions: Xiangzhao Wang Chinese Academy of Sciences Zhongliang Li
13. Feature Of The Week 09/10/2017: Thermo-elastic Optical Coherence Tomography
  
  Explore Optical Coherence Tomography News Sep 9 2017
  
  The conventional OCT image contrast is derived from elastic scattering, and shows the internal structure of the sample. The determination of the tissue type in OCT images usually depends on the interpretation by the image reader. More accurate tissue type contrast may be achieved by new OCT-based imaging modalities, with sensitivity to other physical parameters than scattering alone. Phase-sensitive OCT can detect tissue motion on nanometer-to- micrometer length scales using ...
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  Mentions: Robert A. Huber Delft University of Technology Chinese Academy of Sciences
14. Thermo-elastic optical coherence tomography
  
  Explore OSA | OSA Publishing Sep 2 2017
  
  The absorption of nanosecond laser pulses induces rapid thermo-elastic deformation in tissue. A sub-micrometer scale displacement occurs within a few microseconds after the pulse arrival. In this Letter, we investigate the laser-induced thermo-elastic deformation using a 1.5 MHz phase-sensitive optical coherence tomography (OCT) system. A displacement image can be reconstructed, which enables a new modality of phase-sensitive OCT, called thermo-elastic OCT. An analysis of the results shows that the ...
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  Mentions: Robert A. Huber Delft University of Technology Chinese Academy of Sciences
15. Microscopic surgery system and navigation method guided by optical coherence tomography (OCT) and automated OCT imaging field calibration
  
  Explore uspto.gov Jul 4 2017 Microscopy , Patents
  
  Provided are a microscopic surgery system and a navigation method guided by optical coherence tomography. The microscopic surgery system may include: an object lens; a surgical microscope unit configured to perform two-dimensional imaging on an area to operate on via the object lens; an optical coherence tomography unit configured to perform two-dimensional tomography imaging on the area via the object lens, with an imaging field calibrated according to that of ...
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  Mentions: Chinese Academy of Sciences
16. Noninvasive chorioretinal imaging in living rabbits using integrated photoacoustic microscopy and optical coherence tomography
  
  Explore OSA | OSA Publishing Jul 1 2017 Ophthalmology
  
  Most reported photoacoustic ocular imaging work to date uses small animals, such as mice and rats, the eyeball sizes of which are less than one-third of those of humans, posing challenges for clinical translation. Here we developed a novel integrated photoacoustic microscopy (PAM) and optical coherence tomography (OCT) system for dual-modality chorioretinal imaging of larger animals, such as rabbits. The system has quantified lateral resolutions of 4.1 m (PAM ...
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  Mentions: University of Michigan Chinese Academy of Sciences Wei Zhang
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