1. Tianjin University

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    1. Mentioned In 21 Articles

    2. A linearly frequency-swept high-speed-rate multi-wavelength laser for optical coherence tomography

      A linearly frequency-swept high-speed-rate multi-wavelength laser for optical coherence tomography
      We proposed and demonstrated a linearly frequency-swept multi-wavelength laser source for optical coherence tomography (OCT) eliminating the need of wavenumber space resampling in the postprocessing progress. The source consists of a multi-wavelength fiber laser source (MFS) and an optical sweeping loop. In this novel laser source, an equally spaced multi-wavelength laser is swept simultaneously by a certain step each time in the frequency domain in the optical sweeping loop. The ...
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    3. Optical coherence tomography with pre-calculated reference spectra

      Optical coherence tomography with pre-calculated reference spectra
      The resample of spectra which is essential for high-precision spectral-domain OCT data processing is sophisticated, and its precision is dependent on the method and equipment. In this paper, we proposed an OCT without inverse FFT. A series of reference spectra corresponding to different optical path length difference was used to convolve with spectra gotten by OCT to acquire time-domain tomography instead of inverse FFT, thus eliminating the resample of spectra ...
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    4. Imaging Spinal Structures With Polarization-Sensitive Optical Coherence Tomography

      Imaging Spinal Structures With Polarization-Sensitive Optical Coherence Tomography
      Impact Statement: We investigate polarization-sensitive optical coherence tomography (PS-OCT) to obtain both intensity and polarization contrast images of in vivo and ex vivo spinal structures like subcutaneous fat, supraspinous ligament, interspinous ligament, ligamentum flavum, dura, and spinal cord in a piglet model. The PS-OCT can provide enhanced contrast characteristic structures compared to the intensity OCT; therefore it has the potential for guidance in spine interventional procedures. Abstract: We investigate polarization-sensitive ...
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    5. Multi-modality Optical Imaging of Rat Kidney Dysfunction: In Vivo Response to Various Ischemia Times

      Multi-modality Optical Imaging of Rat Kidney Dysfunction: In Vivo Response to Various Ischemia Times
      We observed in vivo kidney dysfunction with various ischemia times at 30, 75, 90, and 120 min using multi-modality optical imaging: optical coherence tomography (OCT), Doppler OCT (DOCT), and two-photon microscopy (TPM). We imaged the renal tubule lumens and glomerulus at several areas of each kidney before, during, and after ischemia of 5-month-old female Munich-Wistar rats. For animals with 30 and 75 min ischemia times, we observed that all areas ...
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    6. Artifactual Flow Signals Within Drusen Detected by OCT Angiography

      Artifactual Flow Signals Within Drusen Detected by OCT Angiography
      BACKGROUND AND OBJECTIVE: To demonstrate possible flow artifacts when imaging drusen with optical coherence tomography angiography (OCTA). PATIENTS AND METHODS: Patients with drusen were enrolled in a prospective OCT study using the Zeiss AngioPlex OCTA instrument (Carl Zeiss Meditec, Dublin, CA). Two kinds of en face slabs were created for visualizing both structure and flow. The first slab followed the contour of Bruch's membrane. The second slab had an ...
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    7. Measurements of the thermal coefficient of optical attenuation at different depth regions of in vivo human skins using optical coherence tomography: a pilot study

      Measurements of the thermal coefficient of optical attenuation at different depth regions of in vivo human skins using optical coherence tomography: a pilot study
      We present detailed measurement results of optical attenuations thermal coefficients (referenced to the temperature of the skin surface) in different depth regions of in vivo human forearm skins using optical coherence tomography (OCT). We first design a temperature control module with an integrated optical probe to precisely control the surface temperature of a section of human skin. We propose a method of using the correlation map to identify regions in ...
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    8. Study on effective probe depth of optical coherence tomography system by Monte Carlo simulation

      Study on effective probe depth of optical coherence tomography system by Monte Carlo simulation
      The intensities of Class I and Class II signals at several different probing depths and different coherence lengths are analyzed using a Monte Carlo model with a pencil beam, and the result shows that the longitudinal resolution has influence on the effective probe depth. A Monte Carlo model for optical coherence tomography system with a focused Gaussian beam is proposed. The intensities of Class I and Class II signals at ...
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    9. Study on application of optical clearing technique in skin diseases

      Study on application of optical clearing technique in skin diseases
      So far, the study of the optical clearing is almost always about healthy tissue. However, the ultimate goal is to detect diseases for clinical application. Optical clearing on diseased skins is explored. The effect is evaluated by applying a combined liquid paraffin and glycerol mixed solution on several kinds of diseased skins in vitro . Scanning experiments from optical coherence tomography show that it has different effects among fibroma, pigmented nevus ...
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    10. Image optimization for noisy optical coherence tomograms

      Image optimization for noisy optical coherence tomograms
      Various kinds of noise in optical coherence tomography (OCT) systems affect the visual effect and image post-processing. A method combined mixed noise reduction with constrained least squares filtering is proposed to minimize noise and restore the image. The sequential gray scale transform and image enhancement are then carried out to optimize the visual effect. The effectiveness is proven with the processing results of degraded OCT images heavily polluted by noise ...
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    11. Quantitative analysis of rectal cancer by spectral domain optical coherence tomography

      Quantitative analysis of rectal cancer by spectral domain optical coherence tomography
      To quantify OCT images of rectal tissue for clinic diagnosis, the scattering coefficient of the tissue is extracted by curve fitting the OCT signals to a confocal single model. A total of 1000 measurements (half and half of normal and malignant tissues) were obtained from 16 recta. The normal rectal tissue has a larger scattering coefficient ranging from 1.09 to 5.41 mm1 with a mean value of 2 ...
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  2. About Tianjin University

    Tianjin University

    Tianjin University  is a national university under the direct administration of the Ministry of Education of China. It is the first university in modern Chinese education history.