1. Yamagata University

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    1. Mentioned In 39 Articles

    2. Evaluation of retinal nerve fiber layer defect using wide-field en-face swept-source OCT images by applying the inner limiting membrane flattening

      Evaluation of retinal nerve fiber layer defect using wide-field en-face swept-source OCT images by applying the inner limiting membrane flattening
      Purpose The assessment of retinal nerve fiber layer defects (RNFLDs) is a useful part of glaucoma care. Here, we obtained en-face images of retinal layers below the inner limiting membrane (ILM) with swept source-optical coherence tomography (SS-OCT), and measured RNFLD angle with new software. Methods This study included 105 eyes of 105 normal tension glaucoma (NTG) patients (age, 59.8 13.2). Exclusion criteria were best-corrected visual acuity 0.5 ...
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    3. Rat brain imaging using full field optical coherence microscopy with short multimode fiber probe

      Rat brain imaging using full field optical coherence microscopy with short multimode fiber probe
      We demonstrated FF OCM(full field optical coherence microscopy) using an ultrathin forward-imaging SMMF (short multimode fiber) probe of 50 m core diameter, 125 m diameter, and 7.4 mm length, which is a typical graded-index multimode fiber for optical communications. The axial resolution was measured to be 2.20 m, which is close to the calculated axial resolution of 2.06 m. The lateral resolution was evaluated to be ...
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    4. Ultrathin forward-imaging short multimode fiber probe for full-field optical coherence microscopy

      Ultrathin forward-imaging short multimode fiber probe for full-field optical coherence microscopy
      To extend the applications of optical coherence tomography (OCT) to the fields of physiology and clinical medicine, less invasive, robust, and reliable optical probes are required. Thus, we demonstrate an ultrathin forward-imaging short multimode fiber (SMMF) optical coherence microscopy (OCM) probe with a 50 m core diameter, 125 m total diameter, and 5.12 mm length. Imaging conditions and magnification were analyzed, and they correspond closely to the measured results ...
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    5. Reflection, phase and en -face sectional imaging of scattering objects using quasi-single-shot wide-field optical coherence tomography

      Reflection, phase and en -face sectional imaging of scattering objects using quasi-single-shot wide-field optical coherence tomography
      We report a quasi-single-shot wide-field optical coherence tomography system that enables to measure the reflection, phase and en - face OCT images from the same setup using the glass jig. The jig consisting of a wedge glass substrate and a glue dot is contacted to the tissue surfaces, and the data within glue dot is used to reduce the phase noise of the interference signal. The reconstructed image size of the ...
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    6. 3D Evaluation of the Lamina Cribrosa with Swept-Source Optical Coherence Tomography in Normal Tension Glaucoma

      3D Evaluation of the Lamina Cribrosa with Swept-Source Optical Coherence Tomography in Normal Tension Glaucoma
      Purpose Although the lamina cribrosa (LC) is the primary site of axonal damage in glaucoma, adequate methods to image and measure it are currently lacking. Here, we describe a noninvasive, in vivo method of evaluating the LC, based on swept-source optical coherence tomography (SS-OCT), and determine this methods ability to quantify LC thickness. Methods This study comprised 54 eyes, including normal (n = 18), preperimetric glaucoma (PPG; n = 18), and normal ...
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    7. The basic study on application of optical coherence tomography to monitoring of viability in vivo rat brain

      The basic study on application of optical coherence tomography to monitoring of viability in vivo rat brain
      The relations and correlation coefficients (CCs) between the OCT signal and the modified state entropy (MSE) of electroencephalogram (EEG) have been studied. Three dimensional (3D) OCT images of rat brains through the thinned skull and EEG have been measured simultaneously anesthetizing to reduce brain activity with the quadrature fringe widefield OCT. Measured 3D volumes are 4mm 4mm 2.8mm (Depth). MSE is the product of state entropy of EEG and ...
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    8. Graphics processing unit accelerated intensity-based optical coherence tomography angiography using differential frames with real-time motion correction

      Graphics processing unit accelerated intensity-based optical coherence tomography angiography using differential frames with real-time motion correction
      We demonstrate intensity-based optical coherence tomography (OCT) angiography using the squared difference of two sequential frames with bulk-tissue-motion (BTM) correction. This motion correction was performed by minimization of the sum of the pixel values using axial- and lateral-pixelshifted structural OCT images. We extract the BTM-corrected image from a total of 25 calculated OCT angiographic images. Image processing was accelerated by a graphics processing unit (GPU) with many stream processors to ...
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    9. Real time processing of Fourier domain optical coherence tomography with fixed-pattern noise removal by partial median subtraction using a graphics processing unit

      Real time processing of Fourier domain optical coherence tomography with fixed-pattern noise removal by partial median subtraction using a graphics processing unit
      The author presents a graphics processing unit (GPU) programming for real-time Fourier domain optical coherence tomography (FD-OCT) with fixed-pattern noise removal by subtracting mean and median. In general, the fixed-pattern noise can be removed by the averaged spectrum from the many spectra of an actual measurement. However, a mean-spectrum results in artifacts as residual lateral lines caused by a small number of high-reflective points on a sample surface. These artifacts ...
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    10. Variations in signal intensity with periodical temperature changes in vivo in rat brain: analysis using wide-field optical coherence tomography

      Variations in signal intensity with periodical temperature changes in vivo in rat brain: analysis using wide-field optical coherence tomography
      In a previous study, we reported measurements of three-dimensional (3D) optical coherence tomography (OCT) images through a thinned skull by reducing temperatures from 28 °C to 18 °C in vivo in the rat brain to show negative correlation coefficients (CCs) between ratios of signal intensity (RSI) and temperature for applications to monitoring brain viability. In this study, using the same OCT system, we measured 3D OCT images of the rat ...
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    11. Simulation of basic characteristics of single-shot full-field optical coherence tomography using spatially phase-modulated reference light

      Simulation of basic characteristics of single-shot full-field optical coherence tomography using spatially phase-modulated reference light
      For the single-shot full-field optical coherence tomography (OCT) using spatially phase-modulated reference light, the basic characteristics have been simulated. At low spatial frequencies, the OCT signal intensity is enhanced twofold owing to subtractions, and with increasing the spatial frequency, the OCT signal intensity decreases 0.636 times at half the Nyquist frequency. OCT signal intensities also depend on orientations in images. Residual noninterference components of signal intensities between adjacent uniform ...
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    12. 1-15 of 39 1 2 3 »
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  2. About Yamagata University

    Yamagata University

    Yamagata University is a leading national university located in the Japanese cities of Yamagata, Yonezawa and Tsuruoka in Yamagata Prefecture. The university was established in 1949. Yamagata University is the second-most largest university in the Tohoku Region. 

    Sato Laboratory is involved in Human Sensing and Functional Sensor Engineering Laboratory at Yamagata University headed by Dr. Manabu Sato.