Unspecified Anqi Zhang Profile

Anqi Zhang

at Optovue Inc

SPIE Involvement:

Author

Publications (8)

Proceedings Article | 26 April 2016 Presentation

Wide field OCT based microangiography in living human eye (Conference Presentation)

Qinqin Zhang, Chieh-Li Chen, Zhongdi Chu, Anqi Zhang, Lin An, Mary Durbin, Utkarsh Sharma, Philip Rosenfeld, Ruikang Wang

Proceedings Volume 9693, 969303 (2016) https://doi.org/10.1117/12.2213097

KEYWORDS: Angiography, Eye, Optical coherence tomography, Detection and tracking algorithms, Blood circulation, Image segmentation, Retina, Visualization, Holmium, Current controlled current source

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SPIE Journal Paper | 16 October 2015 Open Access

Methods and algorithms for optical coherence tomography-based angiography: a review and comparison

Anqi Zhang, Qinqin Zhang, Chieh-Li Chen, Ruikang Wang

JBO, Vol. 20, Issue 10, 100901, (October 2015) https://doi.org/10.1117/12.10.1117/1.JBO.20.10.100901

KEYWORDS: Optical coherence tomography, Angiography, Doppler tomography, Speckle, Doppler effect, Visualization, Blood vessels, Tissue optics, Tissues, Coherence (optics)

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Proceedings Article | 2 June 2014 Paper

Graphene-coated microfiber FBG for highly sensitive gas sensing

Bai-Cheng Yao, Yu Wu, Anqi Zhang, Yang Cheng, Cai-bin Yu, Yuan Gong, Yun-Jiang Rao

Proceedings Volume 9157, 915748 (2014) https://doi.org/10.1117/12.2058502

KEYWORDS: Graphene, Fiber Bragg gratings, Sensors, Reflection, Chemical analysis, Gas sensors, Refractive index, Adsorption, Biological and chemical sensing, Signal attenuation

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Proceedings Article | 2 June 2014 Paper

Highly sensitive gas sensor based on graphene/microfiber hybrid waveguide with Mach-Zehnder interferometer

Yu Wu, Baicheng Yao, Yang Cheng, Anqi Zhang, Yuan Gong, Yun-Jiang Rao

Proceedings Volume 9157, 915747 (2014) https://doi.org/10.1117/12.2058501

KEYWORDS: Graphene, Gas sensors, Waveguides, Sensors, Mach-Zehnder interferometers, Magnesium fluoride, Chemical analysis, Single mode fibers, Raman spectroscopy, Molecules

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Proceedings Article | 25 March 2013 Paper

Development of transrectal diffuse optical tomography combined with 3D-transrectal ultrasound imaging to monitor the photocoagulation front during interstitial photothermal therapy of primary focal prostate cancer

Jie He, Robert Weersink, Israel Veilleux, Kenwrick Mayo, Anqi Zhang, Daqing Piao, Adeel Alam, John Trachtenberg, Brian Wilson

Proceedings Volume 8578, 85781J (2013) https://doi.org/10.1117/12.2004457

KEYWORDS: Tissue optics, Sensors, Scattering, Laser therapeutics, Optical properties, Prostate cancer, Reconstruction algorithms, Signal detection, Laser coagulation, Tissues

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Proceedings Article | 25 March 2013 Paper

Normalized Born ratio of steady-state fluorescence in concave- and convex-shaped infinitely long cylindrical medium geometries

Anqi Zhang, Daqing Piao

Proceedings Volume 8578, 857814 (2013) https://doi.org/10.1117/12.2005253

KEYWORDS: Sensors, Luminescence, Diffusion, Finite element methods, Chemical elements, Target detection, Interfaces, Optical properties, Scattering

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Proceedings Article | 17 February 2011 Paper

"Spiral-planar equivalence" of steady state photon diffusion associated with a cylindrical applicator

Anqi Zhang, Daqing Piao, Charles Bunting

Proceedings Volume 7896, 78960V (2011) https://doi.org/10.1117/12.874898

KEYWORDS: Diffusion, Sensors, Finite element methods, Interfaces, Radium, Tissues, Tissue optics, Optical sensing, Rubidium, Diffuse optical imaging

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We predict the phenomenon of "spiral-planar equivalence" for steady-state photon diffusion associated with a cylindrical applicator. Recently we have derived a unified theory of steady-state photon diffusion in a homogenous medium bounded either externally (referred to as a concave geometry) or internally (referred to as a convex geometry) by an infinitely long circular cylindrical applicator [JOSAA, 27(3): 648-662 (2010)]. Despite the idealization of the geometry by assuming an infinite length of the applicator, the analytic prediction withholds the quantitative examinations based on experimental measurements, and finite-element solution of photon diffusion. An interesting finding is that the decay of photon fluence in a concave boundary is smaller in the azimuth direction but greater along the longitudinal direction, in comparison with that in a semi-infinite geometry along a straight line, for the same line-of-sight distance between the source and the detector. Conversely, the decay of photon fluence in a convex boundary is greater in the azimuth direction but smaller along the longitudinal direction, in comparison with that in a semi-infinite geometry along a straight line, for the same line-of-sight source-detector distance. These findings suggest that on the cylindrical applicator interface there should exist a spiral direction (oblique to both the azimuthal and longitudinal directions), along which the rate of photon fluence decay follows that along a straight line on a planar semi-infinite interface---which is called the "spiral-planar equivalence". The "spiral-planar equivalence" is derivable analytically, and subject to quantitative evaluations. Validating the "spiral-planar equivalence" not only enriches the understanding of photon diffusion in cylindricalinterface geometry, but also provides unique semi-infinite-based imaging application in trans-lumenal diffuse optical sensing. The "spiral-planar equivalence" may be applicable to time-resolved photon-diffusion.

Proceedings Article | 12 February 2009 Paper

Forward modeling of axial trans-lumenal diffuse optical imaging with a cylindrical applicator using continuous-wave photon-illumination

Anqi Zhang, Daqing Piao, Gang Yao, Charles Bunting, Jerzy Krasinski, Brian Pogue

Proceedings Volume 7174, 717404 (2009) https://doi.org/10.1117/12.808012

KEYWORDS: Diffusion, Photon transport, Diffuse optical imaging, Sensors, Continuous wave operation, Monte Carlo methods, Calibration, Bessel functions, Optical tomography, Ions

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