Articles that mention Zhejiang University -Optical Coherence Tomography News

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1. Mentioned In 65 Articles
2. Noninvasive structural and microvascular anatomy of oral mucosae using handheld optical coherence tomography
  
  Explore OSA | OSA Publishing 16 hours, 5 min ago
  
  In this study, we demonstrated the feasibility of using a handheld optical coherence tomography (OCT) for in vivo visualizations of the microstructural and microvascular features of various oral mucosal types. To scan arbitrary locations of the oral mucosa, a scanning probe was developed, composed of a probe body fabricated by a 3D printer, miniaturized two-axis galvanometer, relay lenses, and reflective prism. With a 3D printing technique, the probe weight and ...
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  Mentions: National Taiwan University Meng-Tsan Tsai Chang Gung University
3. Phase and amplitude correction in polygon tunable laser-based optical coherence tomography
  
  Explore SPIE Digital Library Oct 10 2017
  
  Phase instability is a serious problem in swept-source optical coherence tomography (OCT) with polygon tunable lasers; however, these devices have additional issues. We found that polygon tunable lasers also have fluctuations in output power and sweep range: the former creates artifacts that may impair the recognition of sample information, and the latter reduces the interference signal utilization during phase correction. We demonstrate a method that uses the calibration signal to ...
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  Mentions: Zhejiang University
4. Spectral-domain optical coherence tomography dynamic changes and steroid response in multiple evanescent white dot syndrome
  
  Explore 欢迎访问国际眼科杂志编辑部 Sep 2 2017 Ophthalmology
  
  Dear Editor, Multiple evanescent white dot syndrome (MEWDS) was first described in 1984 as a rare, acute, unilateral, multifocal retinochoroidal disorder, typically affecting young myopic women[1]. Previous studies with fluorescein angiography (FA) and electrophysiology suggested that MEWDS to be a disease in the retinal pigment epithelium (RPE) or outer retina[2], while recent studies with spectraldomain optical coherence tomography (SD-OCT) suggested it may be an outer retinal disease due ...
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  Mentions: Zhejiang University
5. In Vivo Calcium Detection by Comparing Optical Coherence Tomography, Intravascular Ultrasound, and Angiography
  
  Explore ScienceDirect Aug 8 2017 Cardiology
  
  Objectives The aim of this study was to evaluate optical coherence tomography (OCT) and intravascular ultrasound (IVUS) versus coronary angiography in the assessment of target lesion calcification and its effect on stent expansion. Background IVUS is more sensitive than angiography in the detection of coronary artery calcium, but the relationship among IVUS, OCT, and angiography has not been studied. Methods Overall, 440 lesions (440 patients with stable angina) underwent OCT- ...
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  Mentions: Columbia University Cardiovascular Research Foundation Gary S. Mintz
6. Using Optical Coherence Tomography to Identify of Oral Mucosae with 3D-Printing Probe
  
  Explore Home - Springer Jul 22 2017
  
  Biomedical materials have different optical properties (e.g. absorption) for different wavelengths. Therefore, probing biomedical materials with multiple wavelengths not only can get in-depth understanding of the detected biomedical materials but also can differentiate the detected biomedical materials. To achieve this purpose, in this conference paper, we present our initial results of building up a portable multiple-wavelength biomedical sensing system. At this initial phase, we assembled this kind of system ...
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  Mentions: National Taiwan University Meng-Tsan Tsai Chang Gung University
7. Lens-free all-fiber probe with an optimized output beam for optical coherence tomography
  
  Explore OSA | OSA Publishing Jul 14 2017 Probes
  
  A high-efficiency lensless all-fiber probe for optical coherence tomography (OCT) is presented. The probe is composed of a segment of large-core multimode fiber (MMF), a segment of tapered MMF, and a length of single-mode fiber (SMF). A controllable output beam can be designed by a simple adjustment of its probe structure parameters (PSPs), instead of the selection of fibers with different optical parameters. A side-view probe with a diameter of ...
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  Mentions: Zhihua Ding Zhejiang University Yi Shen
8. Quasi-needle-like focus synthesized by optical coherence tomography
  
  Explore OSA | OSA Publishing Mar 28 2017
  
  It is known that lateral resolution and depth of focus (DOF) in an optical imaging system are coupled, and a compromise between them has to be made. In this Letter, we propose to resolve the trade-off between lateral resolution and the DOF by a synthetic effective point spread function in optical path length (OPL) domain. A quasi-needle-like focus is synthesized by optical coherence tomography. We demonstrate that the synthesized quasi-needle-like ...
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  Mentions: Zhihua Ding Zhejiang University Peng Li
9. Motion correction using overlapped data correlation based on a spatial-spectral encoded parallel optical coherence tomography
  
  Explore OSA | OSA Publishing Mar 24 2017
  
  This paper presents an approach to remove motion artifacts based on a spatial-spectral encoded parallel OCT (SSE-POCT) system, where encoded rectangular illumination is employed. Motion artifacts within a B-scan are avoided due to parallel detection intrinsic to parallel OCT, while those between successive B-scans are estimated and corrected by a proposed overlapped data correlation (ODC) algorithm. To preserve axial resolution, decoded B-scan corresponding to complete spectrum is stitched from successive ...
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  Mentions: Zhihua Ding Zhejiang University Peng Li
10. Coagulation monitoring based on blood elastic measurement using optical coherence tomography
  
  Explore Conference Proceedings Mar 1 2017
  
  Blood coagulation monitoring is important to diagnose hematological diseases and cardiovascular diseases and to predict the risk of bleeding and excessive clotting. In this study, we developed a system to dynamically monitor blood coagulation and quantitatively determine the coagulation function by blood elastic measurement. When blood forms a clot from a liquid, ultrasonic force induces a shear wave, which is detected by optical coherence tomography (OCT). The coagulation of porcine ...
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  Mentions: Zhongping Chen UC Irvine Zhejiang University
11. A useful way to develop effective in vivo skin optical clearing agents
  
  Explore Wiley Online Library Dec 23 2016 Dermatology
  
  Skin optical clearing has shown tremendous potential in improving various optical imaging performances, but there is some certain blindness in screening out high-efficiency in vivo optical clearing methods. In this work, three optical clearing agents: sucrose (Suc), fructose (Fruc) and PEG-400 (PEG), and two chemical penetration enhancers: propylene glycol (PG) and thiazone (Thiaz) were used. PEG was firstly mixed with the two penetration enhancers, respectively, and then mixed with Fruc ...
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  Mentions: Zhihua Ding Zhejiang University Peng Li
12. Angular compounding by full-channel B-scan modulation encoding for optical coherence tomography speckle reduction
  
  Explore SPIE | Journal Aug 26 2016
  
  We describe an angular compounding method by full-channel B-scan modulation encoding for speckle reduction in optical coherence tomography. The complex-valued spectral interferogram (SI) is reconstructed by removing one of the conjugate terms in the depth space. Fourier transform of the complex SI along the lateral direction enables a full-channel (with both negative and positive Fourier space) for B-scan modulation in the spatial frequency ( ) domain. A full-size probe beam, determined by ...
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  Mentions: Zhihua Ding Zhejiang University Peng Li
13. Hybrid averaging offers high-flow contrast by cost apportionment among imaging time, axial, and lateral resolution in optical coherence tomography angiography
  
  Explore OSA | OSA Publishing Aug 23 2016
  
  The current temporal, wavelength, angular, and spatial averaging approaches trade imaging time and resolution for multiple independent measurements that improve the flow contrast in optical coherence tomography angiography (OCTA). We find that these averaging approaches are equivalent in principle, offering almost the same flow contrast enhancement as the number of averages increases. Based on this finding, we propose a hybrid averaging strategy for contrast enhancement by cost apportionment. We demonstrate ...
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  Mentions: Zhihua Ding Zhejiang University Peng Li
14. Optical coherence tomography angiography offers comprehensive evaluation of skin optical clearing in vivo by quantifying optical properties and blood flow imaging simultaneously
  
  Explore SPIE | Journal Mar 9 2016 Dermatology
  
  Tissue optical clearing (TOC) is helpful for reducing scattering and enhancing the penetration depth of light, and shows promising potential in optimizing optical imaging performances. A mixture of fructose with PEG-400 and thiazone (FPT) is used as an optical clearing agent in mouse dorsal skin and evaluated with OCT angiography (Angio-OCT) by quantifying optical properties and blood flow imaging simultaneously. It is observed that FPT leads to an improved imaging ...
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  Mentions: Zhihua Ding Zhejiang University Peng Li
15. Single-shot angular compounded optical coherence tomography angiography by splitting full-space B-scan modulation spectrum for flow contrast enhancement
  
  Explore OSA | OSA Publishing Mar 5 2016
  
  We proposed a single-shot spatial angular compounded optical coherence tomography angiography (AC-Angio-OCT) for blood flow contrast enhancement. By encoding incident angles in B-scan modulation frequencies and splitting the modulation spectrum in the spatial frequency domain, angle-resolved independent subangiograms were obtained and compounded to improve the flow contrast. A full space of the spatial frequency domain allows a wide modulation spectrum. To get access to the full space of the spatial ...
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  Mentions: Zhihua Ding Zhejiang University Peng Li
16. Improved motion contrast and processing efficiency in OCT angiography using complex-correlation algorithm
  
  Explore IOPscience Dec 26 2015
  
  The complex-based OCT angiography (Angio-OCT) offers high motion contrast by combining both the intensity and phase information. However, due to involuntary bulk tissue motions, complex-valued OCT raw data are processed sequentially with different algorithms for correcting bulk image shifts (BISs), compensating global phase fluctuations (GPFs) and extracting flow signals. Such a complicated procedure results in massive computational load. To mitigate such a problem, in this work, we present an inter-frame ...
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  Mentions: Zhihua Ding Zhejiang University Peng Li
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