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 22 Articles
2. 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
3. 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
4. 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
5. 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
6. 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
7. 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
8. 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
9. Imaginary part-based correlation mapping optical coherence tomography for imaging of blood vessels in vivo
  
  Explore SPIE | Journal Dec 1 2015
  
  We present an imaginary part-based correlation mapping optical coherence tomography (IMcmOCT) technique for in vivo blood vessels imaging. In the conventional correlation mapping optical coherence tomography (cmOCT) method, two adjacent frames of intensity-based structural images are correlated to extract blood flow information and the size of correlation window has to be increased to improve the signal-to-noise ratio of microcirculation maps, which may cause image blur and miss the small blood ...
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  Mentions: Wanrong Gao Nanjing University of Science and Technology
10. Rapid and high-resolution imaging of human liver specimens by full-field optical coherence tomography
  
  Explore SPIE | Journal Dec 1 2015
  
  We report rapid and high-resolution tomographic en face imaging of human liver specimens by full-field optical coherence tomography (FF-OCT). First, the arrangement of the FF-OCT system was described and the performance of the system was measured. The measured axial and lateral resolutions of the system are 0.8 and 0.9 m , respectively. The system has a sensitivity of 60 dB and can achieve an imaging rate of 7 fps ...
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  Mentions: Wanrong Gao Nanjing University of Science and Technology
11. Image contrast reduction mechanism in full-field optical coherence tomography
  
  Explore Wiley Online Library Nov 2 2015 Microscopy
  
  Correct interpretation of image contrast obtained with full-field optical coherence tomography (FFOCT) technique is required for accurate medical diagnosis applications. In this work, first, the characteristics of microscopic structures of tissue that generate the contrast in en-face tomographic image obtained with FFOCT are discussed. Then an overview is given of the parameters that affect image contrast. Finally, the contrast correction factor for correct image interpretation and the contrast limits to ...
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  Mentions: Wanrong Gao Nanjing University of Science and Technology
12. Stage-based frequency-modulated full-range complex Fourier-domain optical coherence tomography
  
  Explore Home - Springer Jul 21 2015
  
  We propose a simple method to modulate spatial interferogram to achieve full-range complex imaging in Fourier-domain optical coherence tomography, in which a sample stage is employed which can be adjusted to introduce a constant carrier frequency into the interference signal during the B-scan by adjusting the stage angle with respect to the normal to the object under test. An additional phase, which is linearly related to the lateral position, is ...
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  Mentions: Wanrong Gao Nanjing University of Science and Technology
13. Fourier spectrum analysis of full-field optical coherence tomography for tissue imaging
  
  Explore rspa.royalsocietypublishing.org Jul 11 2015
  
  We propose a model of the full-field optical coherence tomography (FFOCT) technique for tissue imaging, in which the fractal model of the spatial correlation function of the refractive index of tissue is employed to approximate tissue structure. The results may be helpful for correctly interpreting en face tomographic images obtained with FFOCT.
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  Mentions: Wanrong Gao Nanjing University of Science and Technology
14. Cube data correlation-based imaging of small blood vessels
  
  Explore SPIE | Journal Apr 11 2015
  
  ...z plane and offering a clear image of the small blood vessels almost missed by the conventional cmOCT method. Nanjing University of Science and Technology, Department of Optical Engineering, 200 Xiao Ling Wei, Nanjing, J...
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  Mentions: Wanrong Gao Nanjing University of Science and Technology
15. High-resolution imaging of biological tissue with full-field optical coherence tomography
  
  Explore Conference Proceedings Mar 16 2015
  
  A new full-field optical coherence tomography system with high-resolution has been developed for imaging of cells and tissues. Compared with other FF-OCT (Full-field optical coherence tomography, FF-OCT) systems illuminated with optical fiber bundle, the improved Khler illumination arrangement with a halogen lamp was used in the proposed FF-OCT system. High numerical aperture microscopic objectives were used for imaging and a piezoelectric ceramic transducer (PZT) was used for phase-shifting. En-face tomographic ...
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  Mentions: Wanrong Gao Nanjing University of Science and Technology
16. The cross-correlation in spectral domain based Doppler optical coherence tomography
  
  Explore ScienceDirect Nov 15 2014
  
  We propose a cross-correlation method which is based on the cross-correlation of two adjacent A-scans of interferogram fringe for imaging the velocities of the blood flowing in vessels. The method was tested by measurements of the velocities of flowing particles within a glass capillary with known mean velocities. Mean standard deviations of flow velocities of the particles determined through the proposed method were compared to those by the conventional phase ...
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  Mentions: Wanrong Gao Nanjing University of Science and Technology
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