1. Osami Sasaki

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    1-14 of 14
    1. Mentioned In 14 Articles

    2. A simple system of swept source optical coherence tomography for a large imaging depth range

      A simple system of swept source optical coherence tomography for a large imaging depth range
      In swept source optical coherence tomography (SSOCT), the imaging depth range sometimes limits its application, such as the whole eye measurement. The methods of extending depth range usually need to redesign the system or add some additional devices. In this paper, we propose a simple system of SSOCT for a large imaging depth range. The system is the same as the original SSOCT with using the swept source clock signal ...
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    3. Passively Driven Probe Based on Miniaturized Propeller for Intravascular Optical Coherence Tomography

      Passively Driven Probe Based on Miniaturized Propeller for Intravascular Optical Coherence Tomography
      Optical coherent tomography (OCT) has enabled clinical applications ranging from ophthalmology to cardiology that revolutionized in vivo medical diagnostics in the last few decades, and a variety of endoscopic probes have been developed in order to meet the needs of various endoscopic OCT imaging. We propose a passive driven intravascular optical coherent tomography (IV-OCT) probe in this paper. Instead of using any electrically driven scanning device, the probe makes use ...
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    4. 3-D surface profile measurement using spectral interferometry based on continuous wavelet transform

      3-D surface profile measurement using spectral interferometry based on continuous wavelet transform
      This study proposes a signal analysis technique that uses continuous wavelet transform for signal processing in a spectral domain optical coherence tomography system. Our method enables us to calculate the optical path difference simply by taking advantage of the fact that the product of the phase and wavelength becomes constant. Experimental results obtained using a pair of gauge blocks with a thickness difference of 40 m confirm that the repetitive ...
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      Mentions: Osami Sasaki
    5. OCT based on multi-frequency sweeping Fizeau interferometer with phase modulating method

      OCT based on multi-frequency sweeping Fizeau interferometer with phase modulating method
      The Multi-frequency sweeping Fizeau-type interferometer (MFS-FI) for optical coherence tomography (OCT) is demonstrated. The multi-frequency sweeping by a variable Fabry-Perot filter permits detection of high-order low-coherence interferometric signals in the Fizeau interferometer. The sinusoidal phase modulation technique was utilized to detect accurate interference amplitude and phase distributions of back scattered light from surfaces of a sample. OCT measurements by the MFS-FI were conducted for vibrating glass plates with a frequency ...
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      Mentions: Osami Sasaki
    6. A new spectral calibration method for Fourier domain optical coherence tomography

      Spectral calibration is important for a Fourier domain optical coherence tomography (FD-OCT) system. A new spectral calibration method for FD-OCT is presented. Through the iterated mapping of spectral interferograms detected by an optical spectrum analyzer and the CCD grating spectrometer, multiple groups of calibration coefficients are obtained. By comparing the effects of these coefficients on improving the amplitude of the axial point spread function (PSF), optimum coefficients are obtained. In ...
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    7. High-speed full range complex Fourier-domain optical coherence tomography using sinusoidal phase-modulating interferometry

      High-speed full-range complex Fourier domain optical coherence tomography (FDOCT) using sinusoidal phase-modulating interferometry is proposed. A high-rate two-dimensional (2-D) CCD camera is used to record time-sequential sinusoidally phase-modulated 2-D spectral interferograms, from which the complex 2-D spectral interferograms corresponding to each frame of the 2-D CCD camera are extracted by Fourier transform method. By taking inverse Fourier transform of the complex spectral interferograms, full-range B-scan images free of the complex ...
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    8. Dynamic full-range Fourier-domain optical coherence tomography using sinusoidal phase-modulating interferometry

      We propose a technique for dynamic full-range Fourier-domain optical coherence tomography by using sinusoidal phase-modulating interferometry, where both the full-range structural information and depth-resolved dynamic information are obtained. A novel frequency-domain filtering algorithm is proposed to reconstruct a time-dependent complex spectral interferogram from the sinusoidally phase-modulated interferogram detected with a high-rate CCD camera. By taking the amplitude and phase of the inverse Fourier transform of the complex spectral interferogram, a ...
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    9. 1-14 of 14
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  2. About Osami Sasaki

    Osami Sasaki

    Osami Sasaki is in the Faculty of Engineering at Niigata University.