Articles from Tong Wu

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   (1 articles) Zhejiang University

2. Popular Articles

   Development of a non-uniform discrete Fourier transform based high speed spectral domain optical coherence tomography system

   Development of a high speed spectral domain optical coherence tomography system at 835 nm

   Two-dimensional scanning realized by an asymmetry fiber cantilever driven by single piezo bender actuator for optical coherence tomography

   Wavelength encoded OCT imaging using swept-source

   Transmissive RSOD for balance-detection-based OCT

   Transit-time analysis based on delay-encoded beam shape for velocity vector quantification by spectral-domain Doppler optical coherence tomography

   Common path endoscopic optical coherence tomography with outside path length compensation

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1. Transit-time analysis based on delay-encoded beam shape for velocity vector quantification by spectral-domain Doppler optical coherence tomography

   Explore Article opticsinfobase.org (Jan 11 2010) Doppler

   We propose a transit-time based method to ascertain the azimuth angle of a velocity vector by spectral-domain Doppler optical coherence tomography (DOCT), so that three-dimensional (3-D) velocity vector can be quantified. A custom-designed slit plate with predetermined slit orientation is placed into the sample beam to create three delay-encoded sub-beams of different beam shape for sample probing. Based on the transit-time analysis for Doppler bandwidth, the azimuth angle within 90° range is evaluated by exploitation of the complex signals corresponding to three path length delays. 3-D velocity vector is quantified through further estimating of Doppler angle and flow velocity by ... (Read Full Article)
   

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2. Development of a high speed spectral domain optical coherence tomography system at 835 nm

   Explore Article SPIE Digital Library (Dec 1 2009) Developmental Biology , Doppler

   We develop a high speed multi-functional spectral domain (SD-OCT) system, using a broadband light source centered at 835nm and a custom-built spectrometer with a spectral resolution of 0.0674nm. After precise spectral calibration of the spectrometer, non-uniform discrete Fourier transform (NDFT) of the acquired spectral data is adopted for image reconstruction. In vivo imaging of human finger from volunteer at A-scan rate of 29 kHz with different reconstruction methods reveal that with the NDFT method, improved sensitivity fall-off especially at large depth is achieved in contrast to the conventional discrete Fourier transform (DFT) with interpolation method. And the phase information of ... (Read Full Article)
   

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3. Transmissive RSOD for balance-detection-based OCT

   Explore Article SPIE Digital Library (Oct 28 2009)

   This paper presents a transmissive rapid scanning optical delay line (RSOD) for balance detection based optical coherence tomography (OCT). This transmissive RSOD, consisting of a reflective blazed grating, a Fourier lens, a fast-scanning galvo-mirror, a right-angle prism and a mirror, functions for phase modulation, axial scanning and dispersion compensation in OCT just as a reflective RSOD. The developed transmissive RSOD is implemented in OCT for balance detection. Comparison study indicates that improved quality of imaging is archived by the transmissive RSOD based OCT, in contrast to that by a conventional reflective RSOD based OCT. (Read Full Article)
   

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4. Two-dimensional scanning realized by an asymmetry fiber cantilever driven by single piezo bender actuator for optical coherence tomography

   Explore Article opticsinfobase.org (Jul 24 2009) Probes

   We develop a fiber based probe that is capable of two-dimensional scanning applicable in optical coherence tomography (OCT). Based on the resonance of the fiber cantilever with asymmetry structure which has two distinguished resonant frequencies in orthogonal directions, Lissajous pattern is produced suitable for two-dimensional scanning upon a sample. Orthogonal resonances of the fiber cantilever are simultaneously excited by single piezo bender actuator with one driving signal consisting of two components corresponding to above-mentioned two resonant frequencies. By integrating a backward-placed two-dimensional position sensitive detector (PSD) into the probe, real-time lateral position of the scanning pattern is registered simultaneously for ... (Read Full Article)
   

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5. Development of a non-uniform discrete Fourier transform based high speed spectral domain optical coherence tomography system

   Explore Article opticsinfobase.org (Jul 2 2009)

   We develop a high speed spectral domain optical coherence tomography (SD-OCT) system based on a custom-built spectrometer and non-uniform discrete Fourier transform (NDFT) to realize minimized depth dependent sensitivity fall-off. After precise spectral calibration of the spectrometer, NDFT of the acquired spectral data is adopted for image reconstruction. The spectrometer is able to measure a wavelength range of about 138nm with a spectral resolution of 0.0674nm at central wavelength of 835nm, corresponding to an axial imaging range of 2.56mm in air. Zemax simulations and sensitivity fall-off measurements under two alignment states of the spectrometer are given. Both theoretical simulations and ... (Read Full Article)
   

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6. Wavelength encoded OCT imaging using swept-source

   Explore Article SPIE Digital Library (Jan 8 2008) Endoscopy , Tunable Sources

   Ling Wang, Zhihua Ding, Tong Wu et al. Wavelength-encoded imaging uses wavelength division multiplexing to produce cross-sectional images without mechanical scanning, and could be of a great interest in endoscope applications. In this paper, a scheme for wavelength-encoded imaging using time-encoded Frequency-domain optical coherence tom ... [Proc. SPIE Int. Soc. Opt. Eng. 6826, 68261V (2008)] published Tue Jan 8, 2008. (Read Full Article)
   

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7. Common path endoscopic optical coherence tomography with outside path length compensation

   Explore Article SPIE Digital Library (Jan 8 2008) Endoscopy

   Yaliang Yang, Zhihua Ding, Jie Meng et al. Endoscopic optical coherence tomography (OCT) allowing high-resolution imaging of internal tissue is attractive for medical imaging. Fibre, fibre bundle or GRIN lens rod acting as endoscopic probe is placed in the sample arm of a Michelson interferometer in current endoscopic OCT systems, this arran ... [Proc. SPIE Int. Soc. Opt. Eng. 6826, 68261S (2008)] published Tue Jan 8, 2008. (Read Full Article)
   

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