1. University of Tsukuba

    0 Comments Leave a Comment

    1-15 of 160 1 2 3 4 ... 9 10 11 »

    1. Mentioned In 160 Articles

    2. In Vivo Evaluation of Tissue Protrusion by Using Optical Coherence Tomography and Coronary Angioscopy Immediately After Stent Implantation

      Explore jstage.jst.go.jp Cardiology
      In Vivo Evaluation of Tissue Protrusion by Using Optical Coherence Tomography and Coronary Angioscopy Immediately After Stent Implantation
      Background: The relationship between the characteristics of tissue protrusion detected by using optical coherence tomography (OCT) and the findings of coronary angioscopy (CAS) immediately after stent implantation were evaluated. Methods and Results: A total of 186 patients (192 stents) underwent OCT before and after stenting and were observed by using CAS immediately after stenting and at the chronic phase. Patients were assigned to irregular protrusion, smooth protrusion, and disrupted fibrous ...
      Read Full Article
      Mentions: University of Tsukuba

    3. Bulk-phase-error correction for phase-sensitive signal processing of optical coherence tomography

      Explore OSA | OSA Publishing
      Bulk-phase-error correction for phase-sensitive signal processing of optical coherence tomography
      We present a numerical phase stabilization method for phase-sensitive signal processing of optical coherence tomography (OCT). This method removes the bulk phase error caused by the axial bulk motion of the sample and the environmental perturbation during volumetric acquisition. In this method, the partial derivatives of the phase error are computed along both fast and slow scanning directions, so that the vectorial gradient field of the phase error is given ...
      Read Full Article
      Mentions: Shuichi Makita Yoshiaki Yasuno University of Tsukuba

    4. Optical coherence tomography interpreted by diffractive optics: A-scan image formation with wavelength-scale diffraction gratings as samples

      Explore OSA | OSA Publishing
      Optical coherence tomography interpreted by diffractive optics: A-scan image formation with wavelength-scale diffraction gratings as samples
      Seeking a detailed investigation of polarization sensitive optical coherence tomography, electromagnetic numerical simulation of optical coherence tomography is carried out assuming deep diffraction gratings, some of which are in the resonance domain, as a sample to be measured. This is an approach from diffractive optics, and its simplification of the problem makes analysis more focused on its fundamental nature. The combination of the two disciplines provides previously unnoticed issues such ...
      Read Full Article
      Mentions: Yoshiaki Yasuno University of Tsukuba

    5. Jones matrix OCT system and program for carrying out image processing on measured data obtained by said OCT

      Explore uspto.gov Ophthalmology , Patents
      Jones matrix OCT system and program for carrying out image processing on measured data obtained by said OCT
      A Jones matrix OCT offers improved image stability, image quality, and depth range of image, wherein light from a wavelength-scanning light source is split into two optical paths, and a reference arm is provided along one optical path, while a probe arm that irradiates and reflects light onto the measuring target to generate object light is provided along the other optical path. The probe arm has a polarization delay unit ...
      Read Full Article
      Mentions: Yoshiaki Yasuno University of Tsukuba

    6. Polarization-sensitive optical coherence elastography

      Explore OSA | OSA Publishing
      Polarization-sensitive optical coherence elastography
      Polarization-sensitive optical coherence elastography (PS-OCE) is developed for improved tissue discrimination. It integrates Jones matrix-based PS-optical coherence tomography (PS-OCT) with compression OCE. The method simultaneously measures the OCT intensity, attenuation coefficient, birefringence, and microstructural deformation (MSD) induced by tissue compression. Ex vivo porcine aorta and esophagus tissues were investigated by PS-OCE and histological imaging. The tissue properties measured by PS-OCE are shown as cross-sectional images and a three-dimensional (3-D) depth-trajectory ...
      Read Full Article
      Mentions: Shuichi Makita Yoshiaki Yasuno University of Tsukuba

    7. Evaluation of Retinal Pigment Epithelium Layer Change in Vogt-Koyanagi-Harada Disease With Multicontrast Optical Coherence Tomography

      Explore IOVS Journal Ophthalmology
      Evaluation of Retinal Pigment Epithelium Layer Change in Vogt-Koyanagi-Harada Disease With Multicontrast Optical Coherence Tomography
      Purpose : Clinical evaluation of retinal pigment epithelium (RPE) change is important for the therapeutic management of chronic Vogt-Koyanagi-Harada (VKH) disease. We evaluated long-term change in the RPE layer in VKH disease, using near-infrared (NIR; 817 nm) images and autofluorescence images at 488 nm (short-wavelength [SW]-AF) and 785 nm (NIR-AF), and compared those images with images from multicontrast optical coherence tomography (MC-OCT). MC-OCT is capable of simultaneous measurement of OCT ...
      Read Full Article
      Mentions: Shuichi Makita Yoshiaki Yasuno Masahiro Miura

    8. Multi-scale and -contrast sensorless adaptive optics optical coherence tomography

      Explore Home Ophthalmology
      Multi-scale and -contrast sensorless adaptive optics optical coherence tomography
      Background: The roles of the retinal microvasculature and the retinal pigment epithelium (RPE) in maintaining the health and metabolic activity of the retina lend great clinical value to their high-resolution visualization. Methods: By integrating polarization diversity detection (PDD) into multi-scale and -contrast sensorless adaptive optics optical coherence tomography (MSC-SAO-OCT), we have developed a novel multi-contrast SAO OCT system for imaging pigment in the RPE as well as flow in the ...
      Read Full Article
      Mentions: Shuichi Makita Yoshiaki Yasuno Oregon Health & Science University

    11. Optical coherence tomography apparatus for selectively visualizing and analyzing vascular network of choroidal layer, and image-processing program and image-processing method for the same

      Explore uspto.gov Ophthalmology , Patents
      Optical coherence tomography apparatus for selectively visualizing and analyzing vascular network of choroidal layer, and image-processing program and image-processing method for the same
      From OCT-measured data, only the image data of the choroidal vascular network present in the layer of the choroidal layer is selectively extracted, thereby accurately obtaining the thickness of the choroidal vessels and thickness of the choroidal vascular network from the image data, to allow for quantitative evaluation of the choroidal vascular network. The optical coherence tomography apparatus has an optical coherence tomography device, and a computer that processes the ...
      Read Full Article
      Mentions: Yoshiaki Yasuno University of Tsukuba

    12. Clinical prototype of pigment and flow imaging optical coherence tomography for posterior eye investigation

      Explore OSA | OSA Publishing
      Clinical prototype of pigment and flow imaging optical coherence tomography for posterior eye investigation
      Measurements of the randomness of polarization (RP) obtained using polarization-sensitive optical coherence tomography (PS-OCT) are applied in several applications, and RP is attractive for posterior eye imaging. The addition of RP without retardation requires a minimal extension to standard OCT; therefore, we developed a prototype OCT system with a simplified scheme for RP measurement. A compact polarization-diversity receiver module is the only required hardware extension to a standard OCT system ...
      Read Full Article
      Mentions: Shuichi Makita Yoshiaki Yasuno University of Tsukuba

    13. Machine-learning based segmentation of the optic nerve head using multi-contrast Jones matrix optical coherence tomography with semi-automatic training dataset generation

      Explore OSA | OSA Publishing
      Machine-learning based segmentation of the optic nerve head using multi-contrast Jones matrix optical coherence tomography with semi-automatic training dataset generation
      A pixel-by-pixel tissue classification framework using multiple contrasts obtained by Jones matrix optical coherence tomography (JM-OCT) is demonstrated. The JM-OCT is an extension of OCT that provides OCT, OCT angiography, birefringence tomography, degree-of-polarization uniformity tomography, and attenuation coefficient tomography, simultaneously. The classification framework consists of feature engineering, k -means clustering that generates a training dataset, training of a tissue classifier using the generated training dataset, and tissue classification by the ...
      Read Full Article
      Mentions: Shuichi Makita Yoshiaki Yasuno University of Tsukuba

    14. Pixel-wise segmentation of severely pathologic retinal pigment epithelium and choroidal stroma using multi-contrast Jones matrix optical coherence tomography

      Explore OSA | OSA Publishing Ophthalmology
      Pixel-wise segmentation of severely pathologic retinal pigment epithelium and choroidal stroma using multi-contrast Jones matrix optical coherence tomography
      Tissue segmentation of retinal optical coherence tomography (OCT) is widely used in ophthalmic diagnosis. However, its performance in severe pathologic cases is still insufficient. We propose a pixel-wise segmentation method that uses the multi-contrast measurement capability of Jones matrix OCT (JM-OCT). This method is applicable to both normal and pathologic retinal pigment epithelium (RPE) and choroidal stroma. In this method, features, which are sensitive to specific tissues of interest, are ...
      Read Full Article
      Mentions: Shuichi Makita Yoshiaki Yasuno Masahiro Miura

    15. Comparison of intensity, phase retardation, and local birefringence images for filtering blebs using polarization-sensitive optical coherence tomography

      Explore Nature Publishing Group
      Comparison of intensity, phase retardation, and local birefringence images for filtering blebs using polarization-sensitive optical coherence tomography
      Polarization-sensitive optical coherence tomography (PS-OCT) allows the recording of depth-resolved polarimetric measurements. It has been reported that phase retardation and local birefringence images can noninvasively detect fibrotic area in blebs after glaucoma surgery. Evaluation of scar fibrosis in blebs is important not only for predicting bleb function, but also for planning revision trabeculectomy. Herein, we characterize the intensity, phase retardation, and local birefringence images of blebs using PS-OCT. A total ...
      Read Full Article
      Mentions: Yoshiaki Yasuno University of Tsukuba Deepa K. Kasaragod

    16. Simultaneous tissue birefringence and deformation measurement by polarization sensitive optical coherence elastography with active compression

      Explore SPIE Digital Library
      Simultaneous tissue birefringence and deformation measurement by polarization sensitive optical coherence elastography with active compression
      Polarization sensitive optical coherence tomography (PS-OCT) measures tissue birefringence, while optical coherence elastography (OCE) reveals the mechanical property of the tissue. Since both birefringence and mechanical properties are associated with tissue microstructures such as collagen, simultaneous PS-OCT and OCE measurement will provide useful insight for the tissue microstructures. In this paper, we present a combined PS-OCT and OCE technique. The PS-OCT is based on Jones matrix OCT theory. It measures ...
      Read Full Article
      Mentions: Shuichi Makita Yoshiaki Yasuno University of Tsukuba
    17. 1-15 of 160 1 2 3 4 ... 9 10 11 »
  1. Search:

  2. Categories

    1. Applications:

      Art, Cardiology, Dentistry, Dermatology, Developmental Biology, Gastroenterology, Gynecology, Microscopy, NDE/NDT, Neurology, Oncology, Ophthalmology, Other Non-Medical, Otolaryngology, Pulmonology, Urology

    2. Business News:

      Acquisition, Clinical Trials, Funding, Other Business News, Partnership, Patents

    3. Technology:

      Broadband Sources, Probes, Tunable Sources

    4. Miscellaneous:

      Jobs & Studentships, Student Theses, Textbooks

  4. 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.

  5. Related Topics

    1. High-penetration imaging of retinal and choroidal pathologies by 1 um swept-source OCT and optical coherence angiography
      146 articles also mentioned Yoshiaki Yasuno
    2. Retinal blood flow measurement by using optical coherence tomography
      92 articles also mentioned Shuichi Makita
    3. Imaging the anterior eye segment by polarization-sensitive spectral-domain and swept-source optical coherence tomography
      42 articles also mentioned Masahiro Yamanari
    4. Automated segmentation of the macula by optical coherence tomography
      29 articles also mentioned Tokyo Medical University
    5. Conical scan polarization-sensitive optical coherence tomography
      18 articles also mentioned Deepa K. Kasaragod