1. Kohji Ohbayashi

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    1. Mentioned In 24 Articles

    2. Speckle variance optical coherence tomography using an SS-OCT system and an extended k-sampling clock

      Speckle variance optical coherence tomography using an SS-OCT system and an extended k-sampling clock
      is vacant or filled with material having a refractive index different from the tissue, the observed structure is deformed significantly. This deformation artifact can be minimized by filling the cavity with liquid having a refractive index nearly equal to the tissue. Furthermore, by using dynamical OCT method, cavity image intensity can be significantly enhanced compared with the tissue. This image contrast improvement may allow imaging of cavity structures inside deep ...
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    3. Feature Of The Week 12/8/2013: Tuning of Vernier Tuned DBR Lasers for Optical Comb Swept Source OCT

      Feature Of The Week 12/8/2013: Tuning of Vernier Tuned DBR Lasers for Optical Comb Swept Source OCT
      ...numerical simulation of PSF over extended depth ranges. For more information see recent Article . Courtesy of Kohji Ohbayashi from Advanced Imaging Co. Ltd . Monolithic Vernier tuned distributed Bragg reflector (VT-DBR) ...
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    4. The impact of real-time 3d imaging by ultra-high speed optical coherence tomography in urothelial carcinoma

      The impact of real-time 3d imaging by ultra-high speed optical coherence tomography in urothelial carcinoma
      Optical coherence tomography (OCT) has become a promising diagnostic tool in many medical fields. In particular, noninvasive real-time optical biopsy of internal organs is one of the most attractive applications of OCT, enabling in situ diagnosis of carcinoma at an early stage. We used an ultra-high speed OCT system for real-time three-dimensional (3D) imaging of three excised specimens of advanced urothelial carcinoma (UC) and investigated the association of the images ...
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      Mentions: Kohji Ohbayashi
    5. Tuning of successively scanned two monolithic Vernier-tuned lasers and selective data sampling in optical comb swept source optical coherence tomography

      Tuning of successively scanned two monolithic Vernier-tuned lasers and selective data sampling in optical comb swept source optical coherence tomography
      ...Choi, Reiko Yoshimura, and Kohji Ohbayashi »View Author Affiliations Dong-hak Choi,^1 Reiko Yoshimura,^1 and Kohji Ohbayashi^2,^3,^* ^1Center for Natural Science, Kitasato University, Kitasato 1-15-1, Minamiku, Sagami...
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    6. Accommodative changes in human eye observed by Kitasato anterior segment optical coherence tomography

      Accommodative changes in human eye observed by Kitasato anterior segment optical coherence tomography
      Purpose To study accommodative changes in the human lens using swept-source optical coherence tomography (Kitasato anterior segment OCT/KAs-OCT), which can image the whole anterior segment of the eye. Methods Thirty-five healthy subjects (mean age 41 years, range 1379 years) were recruited. Using KAs-OCT, we measured the curvature of the anterior (ASC) and posterior surfaces (PSC), the thickness (LT) of the lens and the anterior chamber depth (ACD) in response ...
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    7. Spectral domain optical coherence tomography of multi-MHz A-scan rates at 1310 nm range and real-time 4D-display up to 41 volumes/second

      Spectral domain optical coherence tomography of multi-MHz A-scan rates at 1310 nm range and real-time 4D-display up to 41 volumes/second
      An ultrafast frequency domain optical coherence tomography system was developed at A-scan rates between 2.5 and 10 MHz, a B-scan rate of 4 or 8 kHz, and volume-rates between 12 and 41 volumes/second. In the case of the worst duty ratio of 10%, the averaged A-scan rate was 1 MHz. Two optical demultiplexers at a center wavelength of 1310 nm were used for linear- k spectral dispersion and ...
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    8. Image diversity, shape modification with accommodation, dynamical change with accommodation, and age dependence of the ciliary body imaged by optical coherence tomography

      Image diversity, shape modification with accommodation, dynamical change with accommodation, and age dependence of the ciliary body imaged by optical coherence tomography
      For investigation of accommodation and presbyopia, the ciliary body and its dynamics were imaged with Optical Coherence Tomography (OCT) method. We used two OCT systems; a discretely-swept frequency-comb OCT with a center wavelength at 1.6Ɓ and ultra-fast spectral domain OCT with a center wavelength at 1.3μm. Measurements of dynamical modification of the ciliary body were carried out with ranging in age from 22 to 79. The OCT images ...
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    9. Developing the World’s First Real-Time 3D OCT Medical Imaging System With LabVIEW and NI FlexRIO

      Developing the World’s First Real-Time 3D OCT Medical Imaging System With LabVIEW and NI FlexRIO
      OCT is a noninvasive imaging technique that provides subsurface, cross-sectional images of materials. Interest in OCT technology continues to grow because it provides much greater resolution than other imaging techniques such as magnetic resonance imaging (MRI) or positron emission tomography (PET). Additionally, the method does not require much preparation and is extremely safe for the patient because it uses low laser outputs and does not require ionizing radiation. OCT uses ...
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    10. Wavelength-tunable light generator and optical coherence tomography device

      The present invention provides an OCT technique that permits tomographic observation of a biological body parts that is difficult to restrain and also provides a tomographic observation technique for the observation of a constrainable part that does not require constraint and remove the burden from biological body. A wavelength-tunable light generator (wavelength-tunable light source) is employed as the light source of the optical coherence tomography device. The wavelength-tunable light generator ...
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  2. About Kohji Ohbayashi

    Kohji Ohbayashi

    Kohji Ohbayashi is CEO at Advanced Imaging Company.  Advanced Imaging Co. Ltd. collaborates on development of OCT systems in general. We are also developing fast-scanning VT-DBR lasers for OCT purpose under a support of JST (Japan Science Technology Agency). If the development succeed, we shall sell VT-DBR lasers as OCT SS sources. We shall also sell VT-DBR-SS-OCT systems.