1. Articles from Haiyi Bian

    1-5 of 5
    1. Extended focus optical coherence tomography with Fresnel lens

      Extended focus optical coherence tomography with Fresnel lens

      We report a Fresnel lens based spectral domain optical coherence tomography (SDOCT) setup to overcome the trade-off between lateral resolution and focusing depth which is one of the main problems for OCT system. We demonstrated the feasibility of the Fresnel lens based SDOCT system by measuring the lateral resolution at different depth positions and compared these results with that obtained by conventional SDOCT illuminated with a light source of a central wavelength of 840 nm and a bandwidth of 50 nm. These results indicated that the Fresnel lens based SDOCT can maintain a constant lateral resolution (~ 6.2 μm or ...

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    2. Measurement and compensation of motion artifacts in spectral domain optical coherence tomography

      Measurement and compensation of motion artifacts in spectral domain optical coherence tomography

      Spectral domain optical coherence tomography (SDOCT) has the capability of generating optical sectioning images at high depth resolution in vivo, which is helpful for the diagnosis of various disease. But when the voluntary and involuntary movement of the sample occurs during the acquisition time, the real structure of the sample will be distorted. So it is valuable to compensate the motion artifacts in SDOCT imaging to obtain high quality images. We demonstrated a self-reference method of detecting and compensating the axial motion artifacts in which the axial motion is first detected by comparing the topology of different layers in tissue ...

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    3. Stage-based frequency-modulated full-range complex Fourier-domain optical coherence tomography

      Stage-based frequency-modulated full-range complex Fourier-domain optical coherence tomography

      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 then induced in the A-scan. The in vivo images of human skin were generated which demonstrate that the method proposed can generate the cross-sectional image with the same quality with ...

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    4. Wavelet transform-based method of compensating dispersion for high-resolution imaging in SDOCT

      Wavelet transform-based method of compensating dispersion for high-resolution imaging in SDOCT

      The axial resolution is an important parameter in Optical Coherence Tomography (OCT). In OCT a broadband light source is used to achieve high axial resolution imaging. However the dispersion results in a broadening of the coherence envelope. The dispersion mismatch between reference and sample arms then needs to be minimized to achieve optimal axial resolution for OCT. In this work we propose a new numerical dispersion compensation method to obtain ultrahigh resolution in SDOCT, in which wavelet transform instead of Fourier transform is used to obtain the signal in different frequency domain. And a series of the phase signals of ...

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    5. Self-spectral calibration for spectral domain optical coherence tomography

      Self-spectral calibration for spectral domain optical coherence tomography

      A different real-time self-wavelength calibration method for spectral domain optical coherence tomography is presented in which interference spectra measured from two arbitrary points on the tissue surface are used for calibration. The method takes advantages of two favorable conditions of optical coherence tomography (OCT) signal. First, the signal back-scattered from the tissue surface is generally much stronger than that from positions in the tissue interior, so the spectral component of the surface interference could be extracted from the measured spectrum. Second, the tissue surface is not a plane and a phase difference exists between the light reflected from two different ...

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    1-5 of 5
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  2. Topics in the News

    1. (5 articles) Nanjing University of Science and Technology
    2. (3 articles) Wanrong Gao
    3. (1 articles) University of Sydney
    4. (1 articles) University of Zurich
    5. (1 articles) UCSD
    6. (1 articles) University of Pittsburgh
    7. (1 articles) L V Prasad Eye Institute
    8. (1 articles) Giuseppe Querques
    9. (1 articles) Carl Zeiss Meditec
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    Self-spectral calibration for spectral domain optical coherence tomography Wavelet transform-based method of compensating dispersion for high-resolution imaging in SDOCT Stage-based frequency-modulated full-range complex Fourier-domain optical coherence tomography Measurement and compensation of motion artifacts in spectral domain optical coherence tomography Extended focus optical coherence tomography with Fresnel lens Optical coherence tomography features of neovascularization in proliferative diabetic retinopathy: a systematic review Retinal microvascular metrics in untreated essential hypertensives using optical coherence tomography angiography Optical coherence tomography angiography findings of fellow eye of proliferative macular telangiectasia type 2: Long term study Reorganization of the perifoveal microvasculature after macular hole closure assessed via optical coherence tomography angiography Optical coherence tomography angiography (OCTA) findings in Serpiginous Choroiditis Changes in retinal layer thickness with maturation in the dog: an in vivo spectral domain - optical coherence tomography imaging study Optical coherence tomography angiography analysis of fabry disease