1. Articles from Shuichi Makita

    73-86 of 86 « 1 2 3 4
    1. Polarization-sensitive swept-source optical coherence tomography at 1 um for birefringence imaging of the posterior segment of the eye

      Polarization-sensitive optical coherence tomography (PS-OCT) for retinal imaging has been developed with time-domain or spectral-domain OCT using broadband light sources at 800-nm band. Recent studies suggested that a 1 um band could achieve higher penetration for imaging the posterior segment of ... [Proc. SPIE 7168, 716817 (2009)] published Thu Feb 19, 2009.
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    2. Blood flow imaging at deep posterior human eye using 1 um spectral-domain optical coherence tomography

      Blood flow imaging of deep posterior eye has been demonstrated by using 1-um spectral-domain optical coherence tomography. The high contrast imaging of deep posterior eye, such as the choroid and the sclera, enables blood flow imaging of choroidal vessels and short posterior ciliary arteries. Opt ... [Proc. SPIE 7168, 716808 (2009)] published Thu Feb 19, 2009.
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    3. Investigation of anterior chamber angle by swept-source polarization sensitive optical coherence tomography

      An application of swept-source polarization sensitive optical coherence tomography (PS-OCT) to anterior eye is presented. The image properties of anterior eye segments in PS-OCT images are discussed. The ability of PS-OCT to visualize trabecular meshwork is evaluated. For this evaluation, 25 normal ... [Proc. SPIE 7163, 71630O (2009)] published Wed Feb 18, 2009.
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    4. Simultaneous birefringence and Doppler flow imaging of the anterior eye segment using multi-functional swept-source optical coherence tomography

      Masahiro Yamanari, Shuichi Makita, Masahiro Miura et al. Corneal and anterior segment optical coherence tomography has been developed to measure cross-sectional images of the anterior eye segment non-invasively. Since conventional OCT measures only the backscattering intensity, it is often difficult to discriminate the tissues of the anterior eye segment ... [Proc. SPIE 7163, 71630M (2009)] published Wed Feb 18, 2009.
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    5. Automated retinal shadow compensation of optical coherence tomography images

      We present an automated numerical method of compensating for retinal shadows in the choroid. In this method, signal extinction caused by retinal vessels is estimated by subtracting median A-scans obtained from beneath the retinal vessels and A-scans from the surrounding area. Adding the obtained offset vector to A-scans from beneath the retinal vessels allows compensating for shadows in the choroid. In vivo imaging of the human eye was performed by 840-nm-band standard resolution spectral domain optical coherence tomography (SD-OCT), and choroidal vasculature projection images were calculated. Removal of retinal shadows distinctly improved the readability of choroidal images
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    6. Visualization of Sub-retinal Pigment Epithelium Morphologies of Exudative Macular Diseases by High-Penetration Optical Coherence Tomography

      PURPOSE. To evaluate the clinical significance of the newly developed long-wavelength probe optical coherence tomography (LP-OCT) for the diagnosis of exudative macular diseases. METHODS. Fourteen eyes of 13 participants were prospectively enrolled in the study. There were seven type I and five type II choroidal neovascularization (CNV) cases associated with age-related macular degeneration and idiopathic neovascularization and one case of polypoidal choroidal vasculopathy (PCV). A custom-built LP-OCT based on swept-source OCT (SS-OCT) technology was used. This new OCT uses a probe beam with a wavelength of 1060 nm that provides deeper penetration into the choroid and higher image contrast to ...
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    7. Full-range, high-speed, high-resolution 1 mu m spectral-domain optical coherence tomography with BM-scan method for the human posterior eye imaging

      High-speed, high-resolution full-range 1 [mu]m spectral-domain optical coherence tomography has been demonstrated. The axial resolution of 7 [mu]m and the depth range of 2.6 mm in tissue are achieved with the line rate of 46,900 Hz. The sensitivity of 98 dB is obtained with full-range imaging. These ... [Proc. SPIE 7139, 713914 (2008)] published Tue Dec 30, 2008.
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    8. Comparison of Spectral Domain Optical Coherence Tomography and Color Photographic Imaging of the Optic Nerve Head in Management of Glaucoma

      BACKGROUND AND OBJECTIVE Spectral domain optical coherence tomography (SD-OCT) allows three-dimensional imaging of the optic disc. The objective of this study was to compare optic disc and cup margins between fundus photographs and SD-OCT. PATIENTS AND METHODS Eighteen eyes with glaucoma were examined by a custom-built SD-OCT. OCT fundus images were used to register fundus photographs and SD-OCT volume. RESULTS Disc margins on fundus photographs corresponded to termination of the highly reflective straight line that represented the retinal pigment epithelium (RPE) or the highly reflective curved line that connected to the RPE on the OCT B-scan images at 99.3 ...
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    9. Imaging Polarimetry in Age-Related Macular Degeneration

      purpose. To evaluate the birefringence properties of eyes with age-related macular degeneration (AMD). To compare the information from two techniques—scanning laser polarimetry (GDx) and polarization-sensitive spectral-domain optical coherence tomography (OCT)—and investigate how they complement each other. methods. The authors prospectively examined the eyes of two healthy subjects and 13 patients with exudative AMD. Using scanning laser polarimetry, they computed phase-retardation maps, average reflectance images, and depolarized light images. To obtain polarimetry information with improved axial resolution, they developed a fiber-based, polarization-sensitive, spectral-domain OCT system and measured the phase retardation associated with birefringence in the same eyes. results. Both ...
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    10. Full-range, high-speed, high-resolution 1μm spectral-domain optical coherence tomography using BM-scan for volumetric imaging of the human posterior eye

      An alternative optical coherence tomography (OCT) to clinical ophthalmic 830 nm spectral-domain OCTs (SD-OCT) is demonstrated. An axial resolution of 7.4 µm, ranging depth of 4.2 mm in tissue, sensitivity of 98.5 dB, and detection speed of 38,300 axial scans/s have been achieved. These are comparable or superior to those of recently commercially available ophthalmic 830 nm SD-OCTs in clinics. In addition, fast volumetric imaging for the in vivo human posterior eye with high-contrast of the choroid is achieved. A broadband 1.04 µm light source enables the high-contrast and high resolution imaging of the ...

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    11. Polarization-sensitive swept-source optical coherence tomography with continuous source polarization modulation

      Masahiro Yamanari, Shuichi Makita, Yoshiaki Yasuno We present fiber-based polarization-sensitive swept-source optical coherence tomography (SS-OCT) based on continuous source polarization modulation. The light source is a frequency swept laser centered at 1.31 μm with a scanning rate of 20 kHz. The incident polarization is modulated by a ... [Opt. Express 16, 5892-5906 (2008)]
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    12. Quantitative retinal-blood flow measurement with three-dimensional vessel geometry determination using ultrahigh-resolution Doppler optical coherence angiography

      Shuichi Makita, Tapio Fabritius, Yoshiaki Yasuno. Retinal blood flow quantification by retinal vessel segmentation with Doppler optical coherence angiography is presented. Vessel diameter, orientation, and position are determined in an en face vessel image and two representative cross-sectional flow images of the vessel. Absolute blood flow ... [Opt. Lett. 33, 836-838 (2008)]
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    13. Polarization-sensitive swept-source optical coherence tomography with continuous polarization modulation

      Masahiro Yamanari, Shuichi Makita, Toyohiko Yatagai et al. We present fiber-based polarization-sensitive swept-source optical coherence tomography (PS-SS-OCT) with continuous polarization modulation. The light source is a high-speed wavelength sweeping source with 1.3 um center wavelength and 20 kHz sweeping frequency. A resonant electro-optic modulator mod ... [Proc. SPIE Int. Soc. Opt. Eng. 6847, 68471J (2008)] published Mon Feb 18, 2008.
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    14. Retinal blood flow measurement by using optical coherence tomography

      Shuichi Makita, Tapio Fabritius, Masahiro Miura et al. Quantification of the three-dimensional (3D) retinal vessel structure and blood flow is demonstrated. 3D blood flow distribution is obtained by Doppler optical coherence angiography (D-OCA). Vessel parameters, i.e. diameter, orientation, and position, are determined in an en face vessel image. The D ... [Proc. SPIE Int. Soc. Opt. Eng. 6847, 68470J (2008)] published Mon Feb 18, 2008.
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    73-86 of 86 « 1 2 3 4
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  2. Topics in the News

    1. (85 articles) University of Tsukuba
    2. (85 articles) Yoshiaki Yasuno
    3. (84 articles) Shuichi Makita
    4. (34 articles) Masahiro Miura
    5. (25 articles) Masahiro Yamanari
    6. (20 articles) Tokyo Medical University
    7. (12 articles) Tapio E. J. Fabritius
    8. (11 articles) University of Oulu
    9. (9 articles) Deepa K. Kasaragod
    10. (6 articles) Risto A. Myllylä
    11. (1 articles) UC Davis
    12. (1 articles) Robert J. Zawadzki
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    14. (1 articles) John S. Werner
    15. (1 articles) Ravi S. Jonnal
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    Automated segmentation of the macula by optical coherence tomography Tissue discrimination in anterior eye using three optical parameters obtainedby polarization sensitive optical coherence tomography Parabolic BM-scan technique for full range Doppler spectral domain optical coherence tomography Visibility of trabecular meshwork by standard and polarization-sensitive optical coherence tomography Enhanced imaging of choroidal vasculature by high-penetration and dual-velocity optical coherence angiography Optoretinography: optical measurements of human cone and rod photoreceptor responses to light Nodular skin lesions: correlation of reflectance confocal microscopy (RCM) and optical coherence tomography (OCT) features OCT and Ophthalmology in the Age of Artificial Intelligence, Tuesday Oct 8, 2019 1:00P EDT Compensation for the Influence of Fluctuations in the Distance to the Object During Noncontact Probing in Spectral Domain Optical Coherence Tomography Pattern electroretinogram changes in patients with primary open-angle glaucoma in correlation with visual field and optical coherence tomography changes Objective evaluation of proliferative diabetic retinopathy using optical coherence tomography Repeatability of Cornea and Sublayer Thickness Measurements Using Optical Coherence Tomography in Corneas of Anomalous Refractive Status