1. Articles from Chih-Wei Lu

    1-7 of 7
    1. Optical tomography digital impression imaging system and method for use thereof

      Optical tomography digital impression imaging system and method for use thereof

      Provided are an optical tomography digital-impression imaging system and a method for use thereof, said system including: an optical coherence tomography scanner, used for obtaining tomographic slice thicknesses of a plurality of tissue areas of each optical tomography digital image; an information analysis and processing component electrically connected to the optical coherence tomography scanner. The information analysis and processing component has a refractive index compensation and optical path correction functions; by way of analysis and processing, tomographic slice thickness correction values corresponding to the tissue areas are obtained, thus establishing a digital model of the tissue areas

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    2. Subgingival calculus imaging based on swept-source optical coherence tomography

      Subgingival calculus imaging based on swept-source optical coherence tomography
      We characterized and imaged dental calculus using swept-source optical coherence tomography (SS-OCT). The refractive indices of enamel, dentin, cementum, and calculus were measured as 1.625 ± 0.024, 1.534 ± 0.029, 1.570 ± 0.021, and 2.097 ± 0.094, respectively. Dental calculus leads strong scattering properties, and thus, the region can be identified from enamel with SS-OCT imaging. An extracted human tooth with calculus is covered with gingiva tissue as an in vitro sample for tomographic imaging.
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    3. Study on image feature extraction and classification for human colorectal cancer using optical coherence tomography

      Study on image feature extraction and classification for human colorectal cancer using optical coherence tomography
      Most of the colorectal cancer has grown from the adenomatous polyp. Adenomatous lesions have a well-documented relationship to colorectal cancer in previous studies. Thus, to detect the morphological changes between polyp and tumor can allow early diagnosis of colorectal cancer and simultaneous removal of lesions. OCT (Optical coherence tomography) has been several advantages including high resolution and non-invasive cross-sectional image in vivo. In this study, we investigated the relationship between the B-scan OCT image features and histology of malignant human colorectal tissues, also en-face OCT image and the endoscopic image pattern. The in-vitro experiments were performed by a swept-source optical ...
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    4. Optical scanning probe

      Optical scanning probe
      An optical scanning probe is provided and includes a housing, a diaphragm disposed in the housing, a rotor, a conduit, an optical fiber module, and a reflector disposed on the rotor, wherein the diaphragm and the housing forms a chamber. The rotor is movably disposed in the chamber and has several fans. The conduit is disposed in the housing to conduct fluid into the chamber, thus impelling the fans and the rotor. The optical fiber module is disposed in the housing and through the diaphragm to transmit a light beam. The reflector rotates with the rotor and reflects the light ...
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    5. Delineation of an oral cancer lesion with swept-source optical coherence tomography

      We demonstrate the ex vivo imaging of an oral cancerous sample with a swept-source optical coherence tomography (SS-OCT) system. With the axial resolution of 8μm in free space and system sensitivity of 108dB, we can well distinguish the normal and abnormal tissue portions in a sample. In particular, we analyze the lateral variation of A-scan profiles to show two parameters of SS-OCT signal for delineating an oral cancer lesion. One of the parameters is the decay constant in the exponential fitting of the SS-OCT signal intensity along depth. This decay constant decreases as the A-scan point moves laterally ...

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    6. Measurement of the hemoglobin oxygen saturation level with spectroscopic spectral-domain optical coherence tomography

      We report the measurement of the hemoglobin (Hb) oxygen saturation level in human blood with a spectroscopic spectral-domain optical coherence tomography (SSD-OCT) system based on the crossover behavior of Hb and oxyhemoglobin (HbO_2) absorption coefficients around 800 nm. By calculating the ratio ... [Opt. Lett. 33, 416-418 (2008)]
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    7. Tissue birefringence of hypercholesterolemic rat liver measured with polarization-sensitive optical coherence tomography

      We measure in vitro tissue birefringence in the liver of hypercholesterolemic rats with polarization-sensitive optical coherence tomography. Tissue birefringence is determined by measuring the phase retardation as a function of tissue depth. The birefringence of such a sample is usually due to the narrow fibrous structures that cannot be resolved by a standard optical coherence tomography system. Anisotropic structures are formed in the hypercholesterolemic rat liver, which is quite different from the isotropic nature of healthy liver. Birefringence is evaluated to give an order of magnitude of 4.48×104 at 790nmin hypercholesterolemic rat liver. The infiltration ...

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    1-7 of 7
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  2. Topics in the News

    1. (5 articles) National Taiwan University
    2. (3 articles) Chang Gung University
    3. (3 articles) Chih-Chung Yang
    4. (3 articles) Meng-Tsan Tsai
    5. (2 articles) National Yang-Ming University
    6. (2 articles) Cheng-Kuang Lee
    7. (2 articles) Nanjing University of Science and Technology
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