Articles that mention Shuichi Makita -Optical Coherence Tomography News

Shuichi Makita

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1. Mentioned In 84 Articles
2. Generation and optimization of superpixels as image processing kernels for Jones matrix optical coherence tomography
  
  Explore OSA | OSA Publishing Sep 12 2017
  
  Jones matrix-based polarization sensitive optical coherence tomography (JM-OCT) simultaneously measures optical intensity, birefringence, degree of polarization uniformity, and OCT angiography. The statistics of the optical features in a local region, such as the local mean of the OCT intensity, are frequently used for image processing and the quantitative analysis of JM-OCT. Conventionally, local statistics have been computed with fixed-size rectangular kernels. However, this results in a trade-off between image sharpness ...
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  Mentions: Shuichi Makita Yoshiaki Yasuno University of Tsukuba
3. Noise-bias and polarization-artifact corrected optical coherence tomography by maximum a-posteriori intensity estimation
  
  Explore OSA | OSA Publishing Mar 4 2017 Ophthalmology
  
  We propose using maximum a-posteriori (MAP) estimation to improve the image signal-to-noise ratio (SNR) in polarization diversity (PD) optical coherence tomography. PD-detection removes polarization artifacts, which are common when imaging highly birefringent tissue or when using a flexible fiber catheter. However, dividing the probe power to two polarization detection channels inevitably reduces the SNR. Applying MAP estimation to PD-OCT allows for the removal of polarization artifacts while maintaining and improving ...
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  Mentions: Shuichi Makita Yoshiaki Yasuno Masahiro Miura
4. Three-dimensional eye motion correction by Lissajous scan optical coherence tomography
  
  Explore OSA | OSA Publishing Mar 1 2017 Ophthalmology
  
  A three-dimensional optical coherence tomography imaging method based on Lissajous scanning is presented. This method was designed to correct eye motion in OCT images. A Lissajous scanning pattern, which has a trajectory that frequently overlaps with itself, is adopted as the OCT scanning protocol to obtain measurement data. Eye motion artifacts are then corrected automatically by software. By comparing the images without and with motion correction, we show the effectiveness ...
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  Mentions: Shuichi Makita Yoshiaki Yasuno University of Tsukuba
5. High contrast and polarization-artifact-free optical coherence tomography by maximum a-posteriori estimation
  
  Explore Conference Proceedings Feb 23 2017
  
  We propose a maximum a-posteriori (MAP) intensity estimator to improve the image contrast of polarization diversity (PD)-OCT imaging to achieve high contrast polarization-artifact-free images. The MAP estimator compensates for the inevitable reduction of signal-to-noise ratio (SNR) in PD-OCT caused by the splitting of power into two polarization detection channels. It also has low noise-offset in low intensity regions such as the vitreous. This method is applied to posterior eye ...
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  Mentions: Shuichi Makita Yoshiaki Yasuno Masahiro Miura
6. Birefringence and vascular imaging of in vivo human skin by Jones-matrix optical coherence tomography
  
  Explore Conference Proceedings Feb 22 2017 Dermatology
  
  A customized 1310-nm Jones-matrix optical coherence tomography (JM-OCT) for dermatological investigation was constructed and used for in vivo normal human skin tissue imaging. This system can simultaneously measure the threedimensional depth-resolved local birefringence, complex-correlation based OCT angiography (OCT-A), degree-ofpolarization- uniformity (DOPU) and scattering OCT intensity. By obtaining these optical properties of tissue, the morphology, vasculature, and collagen content of skin can be deduced and visualized. Structures in the deep layers ...
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  Mentions: Shuichi Makita Yoshiaki Yasuno University of Tsukuba
7. Motion-corrected en face optical coherence tomography angiography imaging based on the modified Lissajous scanning pattern
  
  Explore Conference Proceedings Feb 14 2017 Ophthalmology
  
  A motion - corrected en face optical coherence tomography angiography (OCT - A) imaging method is presented in this paper. This method was designed to correct eye motion artifacts in en face OCT - A images automatically using a software. A modified Lissajous scanning pattern, which is compatible with OCT - A, was adopted as the scanning protocol for the optical coherence tomography (OCT) machine to obtain the OCT - A data. The OCT - A ...
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  Mentions: Shuichi Makita Yoshiaki Yasuno University of Tsukuba
8. Evaluation of intraretinal migration of retinal pigment epithelial cells with Jones matrix optical coherence tomography
  
  Explore Conference Proceedings Feb 14 2017
  
  We evaluated intraretinal RPE migration in AMD using multimodal imaging including polarimetric images. Depolarized light images were computed using a PS-SLO. M-DOPU was calculated using multifunctional Jones-matrix OCT. RPE migration was detected in 59 of 155 eyes. Focal similarities could be confirmed among en-face projection images of minimum M-DOPU, depolarized light images, and NIR-AF images.
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  Mentions: Shuichi Makita Yoshiaki Yasuno Masahiro Miura
9. Three-dimensional multi-contrast imaging of in vivo human skin by Jones matrix optical coherence tomography
  
  Explore OSA | OSA Publishing Feb 7 2017 Dermatology
  
  A custom made dermatological Jones matrix optical coherence tomography (JM-OCT) is presented. It uses a passive-polarization-delay component based swept-source JM-OCT configuration, but is specially designed for in vivo human skin measurement. The center wavelength of its probe beam is 1310 nm and the A-line rate is 49.6 kHz. The JM-OCT is capable of simultaneously providing birefringence (local retardation) tomography, degree-of-polarization-uniformity tomography, complex-correlation-based optical coherence angiography, and conventional scattering OCT ...
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  Mentions: Shuichi Makita Yoshiaki Yasuno University of Tsukuba
10. Noise stochastic corrected maximum a posteriori estimator for birefringence imaging using polarization-sensitive optical coherence tomography
  
  Explore OSA | OSA Publishing Jan 11 2017
  
  This paper presents a noise-stochastic corrected maximum a posteriori estimator for birefringence imaging using Jones matrix optical coherence tomography. The estimator described in this paper is based on the relationship between probability distribution functions of the measured birefringence and the effective signal to noise ratio (ESNR) as well as the true birefringence and the true ESNR. The Monte Carlo method is used to numerically describe this relationship and adaptive 2D ...
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  Mentions: Shuichi Makita Yoshiaki Yasuno University of Tsukuba
11. Full-range ultrahigh-resolution spectral-domain optical coherence tomography in 1.7 µm wavelength region for deep-penetration and high-resolution imaging of turbid tissues
  
  Explore IOPscience Dec 8 2016
  
  For the first time, we developed a full-range ultrahigh-resolution (UHR) spectral-domain optical coherence tomography (SD-OCT) technique working in the 1.7 m wavelength region. This technique allowed high-resolution, deep-tissue imaging. By using a supercontinuum source operating at a wavelength of 1.7 m, an axial resolution of 3.6 m in a tissue specimen was achieved. To enhance the imaging depth of UHR-SD-OCT, we performed full-range OCT imaging based on ...
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  Mentions: Shuichi Makita Yoshiaki Yasuno University of Tsukuba
12. Investigation of Thermal Effects of Photocoagulation on Retinal Tissue Using Fine-Motion-Sensitive Dynamic Optical Coherence Tomography
  
  Explore Journals | PLOS Jun 6 2016 Ophthalmology
  
  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
13. Eye motion corrected OCT imaging with Lissajous scan pattern
  
  Explore Conference Proceedings Mar 15 2016 Ophthalmology
  
  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
14. Quantitative optical coherence tomography by maximum a-posteriori estimation of signal intensity
  
  Explore Conference Proceedings Mar 15 2016
  
  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
15. Noise-immune complex correlation for vasculature imaging based on standard and Jones-matrix optical coherence tomography
  
  Explore Conference Proceedings Mar 15 2016
  
  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
16. Quantitative polarization and flow evaluation of choroid and sclera by multifunctional Jones matrix optical coherence tomography
  
  Explore Conference Proceedings Mar 11 2016 Ophthalmology
  
  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
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