1. Shuichi Makita

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    1. Mentioned In 74 Articles

    2. Investigation of Thermal Effects of Photocoagulation on Retinal Tissue Using Fine-Motion-Sensitive Dynamic Optical Coherence Tomography

      Explore Journals | PLOS Ophthalmology
      Investigation of Thermal Effects of Photocoagulation on Retinal Tissue Using Fine-Motion-Sensitive Dynamic Optical Coherence Tomography
      To enable an objective evaluation of photocoagulation, we characterize thermal tissue changes induced by laser irradiation with different laser parameters using optical coherence tomography (OCT). Spectral-domain OCT with a newly developed image processing method was used to monitor the thermal changes of ex vivo porcine retina. A sequence of OCT B-scans was obtained at the same retinal position simultaneously with the photocoagulation. Cross-sectional tissue displacement maps with respect to an ...
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      Mentions: Shuichi Makita Yoshiaki Yasuno University of Tsukuba

    3. Eye motion corrected OCT imaging with Lissajous scan pattern

      Explore Conference Proceedings Ophthalmology
      Eye motion corrected OCT imaging with Lissajous scan pattern
      Ophthalmic optical coherence tomography (OCT) is a powerful tool which provides high resolution three dimensional (3D) volumetric image of human retina. However, the measurement data of OCT suffer motion artifact due to the involuntary eye motion during data acquisition. To eliminate this motion artifact and provide the true shape of retinal image, an eye motion corrected OCT imaging method based on Lissajous scan pattern is proposed in this paper. In ...
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      Mentions: Shuichi Makita Yoshiaki Yasuno Masahiro Miura

    4. Quantitative optical coherence tomography by maximum a-posteriori estimation of signal intensity

      Explore Conference Proceedings
      Quantitative optical coherence tomography by maximum a-posteriori estimation of signal intensity
      A maximum a-posteriori (MAP) estimator for signal amplitude of optical coherence tomography (OCT) is presented. This estimator provides an accurate and low bias estimation of the correct OCT signal amplitude even at very low signal-tonoise ratios. As a result, contrast improvement of retinal OCT images is demonstrated. In addition, this estimation method allows for an estimation reliability to be calculated. By combining the MAP estimator with a previously demonstrated attenuation ...
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      Mentions: Shuichi Makita Yoshiaki Yasuno Masahiro Miura

    5. Noise-immune complex correlation for vasculature imaging based on standard and Jones-matrix optical coherence tomography

      Explore Conference Proceedings
      Noise-immune complex correlation for vasculature imaging based on standard and Jones-matrix optical coherence tomography
      A new optical coherence angiography (OCA) method, called correlation mapping OCA (cmOCA), is presented by using the SNR-corrected complex correlation. An SNR-correction theory for the complex correlation calculation is presented. The method also integrates a motion-artifact-removal method for the sample motion induced decorrelation artifact. The theory is further extended to compute more reliable correlation by using multi- channel OCT systems, such as Jones-matrix OCT. The high contrast vasculature imaging of ...
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      Mentions: Shuichi Makita Masahiro Miura University of Tsukuba

    6. Quantitative polarization and flow evaluation of choroid and sclera by multifunctional Jones matrix optical coherence tomography

      Explore Conference Proceedings Ophthalmology
      Quantitative polarization and flow evaluation of choroid and sclera by multifunctional Jones matrix optical coherence tomography
      Quantitative evaluation of optical properties of choroid and sclera are performed by multifunctional optical coherence tomography. Five normal eyes, five glaucoma eyes and one choroidal atrophy eye are examined. The refractive error was found to be correlated with choroidal birefringence, polarization uniformity, and flow in addition to scleral birefringence among normal eyes. The significant differences were observed between the normal and the glaucoma eyes, as for choroidal polarization uniformity, flow ...
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      Mentions: Shuichi Makita Yoshiaki Yasuno Masahiro Miura

    7. Three-dimensional multifunctional optical coherence tomography for skin imaging

      Explore Conference Proceedings Dermatology
      Three-dimensional multifunctional optical coherence tomography for skin imaging
      Optical coherence tomography (OCT) visualizes cross-sectional microstructures of biological tissues. Recent developments of multifunctional OCT (MF-OCT) provides multiple optical contrasts which can reveal currently unknown tissue properties. In this contribution we demonstrate multifunctional OCT specially designed for dermatological investigation. And by utilizing it to measure four different body parts of in vivo human skin, three-dimensional scattering OCT, OCT angiography, polarization uniformity tomography, and local birefringence tomography images were obtained by ...
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      Mentions: Shuichi Makita Yoshiaki Yasuno University of Tsukuba

    8. Maximum a posteriori estimator for high-contrast image composition of optical coherence tomography

      Explore OSA | OSA Publishing Ophthalmology
      Maximum a posteriori estimator for high-contrast image composition of optical coherence tomography
      A quantitative signal amplitude estimator for optical coherence tomography (OCT) is presented. It is based on a statistical model of OCT signal and noise, using a Bayesian maximum a posteriori (MAP) estimation framework. Multiple OCT images are used for estimation, similar to the widely utilized intensity averaging method. The estimator is less biased especially at low-intensity regions, where intensity averaging approaches the noise power and hence is biased. The estimator ...
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      Mentions: Shuichi Makita Yoshiaki Yasuno Masahiro Miura

    9. Birefringence imaging of posterior eye by multi-functional Jones matrix optical coherence tomography

      Explore OSA | OSA Publishing Ophthalmology
      Birefringence imaging of posterior eye by multi-functional Jones matrix optical coherence tomography
      A clinical grade prototype of posterior multifunctional Jones matrix optical coherence tomography (JM-OCT) is presented. This JM-OCT visualized depth-localized birefringence in addition to conventional cumulative phase retardation imaging through local Jones matrix analysis. In addition, it simultaneously provides a sensitivity enhanced scattering OCT, a quantitative polarization uniformity contrast, and OCT-based angiography. The probe beam is at 1- m wavelength band. The measurement speed and the depth-resolution were 100,000 A-lines ...
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      Mentions: Shuichi Makita Yoshiaki Yasuno Masahiro Miura

    10. Doppler Optical Coherence Tomography Imaging of Feeder Vessels in Exudative Macular Disease

      Explore OMICS Group Ophthalmology
      Doppler Optical Coherence Tomography Imaging of Feeder Vessels in Exudative Macular Disease
      We evaluated the three-dimensional vascular architecture of feeder vessels in exudative macular disease. A case of polypoidal choroidal vasculopathy with choroidal neovascularization was examined with Doppler optical coherence tomography (OCT), and the three-dimensional architecture of the feeder vessels could be clearly visualized in the Doppler OCT angiography image, showing the site of growth of the feeder vessels passing through Bruchs membrane. Together, the results demonstrated in this case report that ...
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      Mentions: Shuichi Makita Yoshiaki Yasuno Masahiro Miura

    16. Two beams formed by Wollaston prism in sample arm in an optical coherence tomography apparatus

      Explore uspto.gov Patents
      Two beams formed by Wollaston prism in sample arm in an optical coherence tomography apparatus
      The scanning speed of a sample in Doppler OCT, etc., is increased to enable quick measurement of blood flow rate, blood flow volume, etc. Wideband light from a light source 2 is linearly polarized by a polarization controller 3 and this linearly polarized beam is split into vertically polarized light and horizontally polarized light using a Wollaston prism 14 at a sample arm, which are then irradiated simultaneously onto two ...
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      Mentions: Shuichi Makita Yoshiaki Yasuno University of Tsukuba
    17. 1-15 of 74 1 2 3 4 5 »
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  4. About Shuichi Makita

    Shuichi Makita is a Researcher in the Computational Optics Group in the Institute of Applied Physics, University of Tsukuba in Japan.

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