1. Tiegen Liu

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    1-13 of 13
    1. Mentioned In 13 Articles

    2. Defocus and contrast agent absorption compensation method in intravascular optical coherence tomography imaging

      Defocus and contrast agent absorption compensation method in intravascular optical coherence tomography imaging
      Intravascular optical coherence tomography (IVOCT) has been widely used in clinical coronary artery intervention field. Owing to defocus and contrast agent absorption effects, the intensity fluctuation caused by imaging catheter locating at an eccentric position significantly influence the quality of IVOCT imaging and even plaque type identification. In this paper, we present a novel method to compensate intensity fluctuation caused by defocus and contrast agent absorption in IVOCT imaging. We ...
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    3. Catheter-Based Polarization Sensitive Optical Coherence Tomography Using Similar Mueller Matrix Method

      Catheter-Based Polarization Sensitive Optical Coherence Tomography Using Similar Mueller Matrix Method
      Objective : Research of catheter-based polarization sensitive optical coherence tomography (PS-OCT) is a challenging field. In this paper, we present a new polarization determination method, similar Mueller matrix (SMM) method, for a catheter-based PS-OCT system using a standard clinical catheter probe with an outer diameter of 0.9 mm. Methods : The SMM method can remove the diattenuation and depolarization compositions by polar decomposition. By constructing the similarity between the measured Mueller ...
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    4. Automatic Lumen Segmentation in Intravascular Optical Coherence Tomography Using Morphological Features

      Automatic Lumen Segmentation in Intravascular Optical Coherence Tomography Using Morphological Features
      Lumen segmentation in intravascular optical coherence tomography (IVOCT) images is a fundamental work for more advanced plaque analysis, stent recognition, fractional flow reserve (FFR) assessment, and so on. However, the catheter, guide-wire, inadequate blood clearance, and other factors will impact on the accuracy of lumen segmentation. We present a simple and effective method for automatic lumen segmentation method in IVOCT based on morphological features. We use image enhancement, median filtering ...
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    5. A FBG-OCT Catheter to reconstruct vascular shape in intravascular optical coherence tomography

      A FBG-OCT Catheter to reconstruct vascular shape in intravascular optical coherence tomography
      We propose a novel Fiber Bragg Grating (FBG)-Optical Coherence Tomography (OCT) catheter to reconstruct vascular shape by intravascular OCT imaging of the actual curvature as well as the bending direction of the vascular in real-time. Compared with the traditional OCT catheter, the FBG-OCT catheter uses the FBG encapsulated with half-sectioned stainless-steel tube as a flexural sensitive component. With the 360-degree rotation of the catheter, the encapsulated FBG will produce ...
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      Mentions: Tiegen Liu
    6. Tomographic Inspection of Fiber Coils Using Optical Coherence Tomography

      Tomographic Inspection of Fiber Coils Using Optical Coherence Tomography
      We report the first study of using optical coherence tomography (OCT) to inspect the winding quality of fiber optical gyro coils. We use a swept-source OCT system to scan a quadrupole-wind fiber coil for obtaining its two-dimensional and three-dimensional (3D) tomographic images. The defects beneath the surface of the fiber coil, which otherwise are invisible by video inspection, can be clearly identified with such tomographic images. The winding quality of ...
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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
      ...u, and Longzhi Wang »View Author Affiliations Ya Su,^1 X. Steve Yao,^1,^2,^* Zhihong Li,^1,^3 Zhuo Meng,^1,^3 Tiegen Liu,^1 and Longzhi Wang^1 ^1Tianjin University, Polarization Research Center, College of Precision In...
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    8. Adaptive Speckle Reduction in OCT Volume Data Based on Block-Matching and 3-D Filtering

      Adaptive Speckle Reduction in OCT Volume Data Based on Block-Matching and 3-D Filtering
      An adaptive speckle denoising method called Volume-BM3D is developed for optical coherence tomography (OCT) volume data processing, including an adaptive noise level estimation algorithm and a denoising strategy based on block-matching and filtering in a highly sparse local 3-D transform domain. Noise level estimation, an important step for denoising, is obtained from estimating signal fluctuations among neighboring A-Scans. Unlike 2-D denoising approaches, the Volume-BM3D considers the similarities of tissue structures ...
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    9. Measurement of the refractive index of human teeth by optical coherence tomography

      We describe a novel method based on optical coherence tomography (OCT) for the accurate measurement of the refractive index of in vitro human teeth. We obtain the refractive indices of enamel, dentin, and cementum to be 1.6310.007, 1.5400.013, and 1.5820.010, respectively. The profile of the refractive index is readily obtained via an OCT B scan across a tooth. This method can be used to ...
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    10. 1-13 of 13
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  2. About Tiegen Liu

    Tiegen Liu is at the College of Precision Instrument and Opto-Electronics Engineering, Tianjin University and Key Laboratory of Opto-Electronics Information Technical, Tianjin University, Ministry of Education, Tianjin China.