1. University of Tsukuba

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    1. Mentioned In 103 Articles

    2. Noninvasive Evaluation of Phase Retardation in Blebs after Glaucoma Surgery Using Anterior Segment Polarization-Sensitive Optical Coherence Tomography

      Noninvasive Evaluation of Phase Retardation in Blebs after Glaucoma Surgery Using Anterior Segment Polarization-Sensitive Optical Coherence Tomography
      ... 3. ^3Computational Optics Group, University of Tsukuba, Tsukuba, 305-8575, Japan 4. ^4Ophthalmology, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki, 305-8575, Japan 5. ^5Ophthalmology, University o...
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    3. Simultaneous Investigation of Vascular and Retinal Pigment Epithelial Pathologies of Exudative Macular Diseases by Multi-Functional Optical Coherence Tomography

      Simultaneous Investigation of Vascular and Retinal Pigment Epithelial Pathologies of Exudative Macular Diseases by Multi-Functional Optical Coherence Tomography
      ...University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8573, Japan 5. ^5Computational Optics Group, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki, 305-8571, Japan 1. ↵* Computational Optics Grou...
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    4. Feature Of The Week 4/20/14: Conical-Scan Polarization-Sensitive Optical Coherence Tomography (CS-PS-OCT)

      Feature Of The Week 4/20/14: Conical-Scan Polarization-Sensitive Optical Coherence Tomography (CS-PS-OCT)

      We report on a new articular cartilage imaging technique with potential for clinical arthroscopic use, by supplementing the variable-incidence-angle polarization-sensitive optical coherence tomography method (VIA-PS-OCT) previously developed by us with a conical beam scan protocol. In the protocol, the beam is scanned such that the k-vector sweeps out a conical surface whose apex is chosen, for convenience, to lie at the tissue surface. In the implementation reported here we achieve this by mounting the sample on a motorized rotation stage with the sample surface roughly parallel to the stage rotating plane (i.e. normal to the stage rotation axis). The ...

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    5. Serial optical coherence tomography assessments at 2- and 4-month follow-up after paclitaxel-eluting stenting of the superficial femoral artery

      Serial optical coherence tomography assessments at 2- and 4-month follow-up after paclitaxel-eluting stenting of the superficial femoral artery

      A 71-year-old man underwent endovascular therapy (EVT) with a paclitaxel-eluting stent in superficial femoral artery (SFA). Optical coherence tomography (OCT) of SFA at 2 months after EVT revealed that several struts were not covered with neointima. Moreover, some mural thrombi were detected within the stent. Although OCT revealed that the frequency of stent strut coverage was improved at the 4-month follow-up, uncovered stent strut still remained and some mural thrombi were observed within the stent even at 4 months after EVT. This is the first report to demonstrate the vascular response after paclitaxel-eluting stent placement for the lesion using serial ...

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    6. Scleral birefringence as measured by polarization-sensitive optical coherence tomography and ocular biometric parameters of human eyes in vivo

      Scleral birefringence as measured by polarization-sensitive optical coherence tomography and ocular biometric parameters of human eyes in vivo
      ... University Ibaraki Medical Center, Ami, Ibaraki, Japan ^3Department of Ophthalmology, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan ^4Computational Optics and Ophthalmology Group, Tsukuba, Ibar...
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    7. Toward absorption contrast imaging of biological tissues in vivo by using photothermal optical coherence tomography

      Toward absorption contrast imaging of biological tissues in vivo by using photothermal optical coherence tomography

      Optical coherence tomography has been proven in the last two decades its clinical value by providing 3D non-invasive in vivo biopsy of the biological samples. In addition to structural information given by the backscattered intensity, the optical absorption will also provide another powerful contrast. Optical absorbers in biological tissues exhibits important role such as hemoglobin and melanin. However, current methods of absorption contrast take long time and not suitable for in vivo imaging. Toward in vivo absorption contrast imaging, we developed photothermal OCT system by combining swept-source OCT system and excitation laser. A swept-source OCT system is used with a ...

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    8. Quantitative two-dimensional micro-displacement measurement by optical coherence tomography

      Quantitative two-dimensional micro-displacement measurement by optical coherence tomography

      There are several applications of quantitative micro-displacement measurement of a biological specimen, including characterization of mechanical property and monitoring a laser-induced photothermal expansion. In this study, we proposed a quantitative micro-displacement measurement method using optical coherence tomography (OCT). Specifically, the axial displacement is measured by Doppler OCT and magnitude of displacement is measured by correlation coefficient. By using this method, we measured the local and microdisplacement of the chicken muscles during laser irradiation. The proposed method successfully visualizes thermal changes of chicken muscle due to the laser irradiation. The measured displacement and deformation are useful information for the further understanding ...

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    9. Five-dimensional analysis of multi-contrast Jones matrix tomography of posterior eye

      Five-dimensional analysis of multi-contrast Jones matrix tomography of posterior eye

      Pixel clustering algorithm tailored to multi-contrast Jones matrix based optical coherence tomography (MC-JMT) is demonstrated. This algorithm clusters multiple pixels of MC-JMT in a five-dimensional (5-D) feature space which comprises dimensions of lateral space, axial space, logarithmic scattering OCT intensity, squared power of Doppler shift and degree of polarization uniformity. This 5-D clustering provides clusters of pixels, so called as superpixels. The superpixels are utilized as local regions for pixels averaging. The averaging decreases the noise in the measurement as preserving structural details of the sample. A simple decision-tree algorithm is applied to classified superpixels into some tissue types. This ...

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    10. Comparison of three-dimensional optical coherence tomography and combining a rotating Scheimpflug camera with a Placido topography system for forme fruste keratoconus diagnosis

      Comparison of three-dimensional optical coherence tomography and combining a rotating Scheimpflug camera with a Placido topography system for forme fruste keratoconus diagnosis
      ... ^2Computational Optics and Ophthalmology Group, Tsukuba, Ibaraki, Japan 3. ^3Computational Optics Group, University of Tsukuba, Tsukuba, Ibaraki, Japan 1. Correspondence to Shinichi Fukuda, Department of Ophtha...
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    11. Comparison of three-dimensional optical coherence tomography and combining a rotating Scheimpflug camera with a Placido topography system for forme fruste keratoconus diagnosis

      Comparison of three-dimensional optical coherence tomography and combining a rotating Scheimpflug camera with a Placido topography system for forme fruste keratoconus diagnosis
      ... ^2Computational Optics and Ophthalmology Group, Tsukuba, Ibaraki, Japan 3. ^3Computational Optics Group, University of Tsukuba, Tsukuba, Ibaraki, Japan 1. Correspondence to Shinichi Fukuda, Department of Ophtha...
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    12. 1-15 of 103 1 2 3 4 5 6 7 »
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  2. About University of Tsukuba

    University of Tsukuba

    University of Tsukuba is located in the city of Tsukuba. The university is ranked one of the top Asian universities in the "Academic Ranking of World Universities" and is ranked 102-150 in the world. The University of Tsukuba has had several Nobel Prize winners so far, namely Leo Esaki, Hideki Shirakawa and Sin-Itiro Tomonaga, which is extremely rare among universities in Asia, where there have been fewer Nobel laureates than in European and American universities. 

    The Computational Optics Group (COG)  at the University of Tsukuba formed in 1999 as a division of applied optics laboratory, institute of applied physics, university of Tsukuba. On that moment we were not COG but spatio-temporal optics group, and our main research subject was spatio-temporal optical computing.   In 2000, we started a optical measurement project using spatio-temporal optical computing technologies, and in 2002, we changed our direction to more computationally.   Since 2002, our main research interest is computer assisted optical measurment. We are trying to introduce computational technologies into optical measurement.  Since 2007, we are an independent research group and no longer a part of Applied Optics Laboratory of University of Tsukuba.