1. Korea University

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    1. Mentioned In 76 Articles

    2. Flexible endoscopic micro-optical coherence tomography for three-dimensional imaging of the arterial microstructure

      Flexible endoscopic micro-optical coherence tomography for three-dimensional imaging of the arterial microstructure
      Micro-optical coherence tomography (OCT) is a novel imaging approach enabling visualization of the microstructures of biological tissues at a cellular or sub-cellular level. However, it has been challenging to develop a miniaturized flexible endoscopic OCT probe allowing helical luminal scanning. In this study, we built a flexible endoscopic OCT probe with an outer diameter of 1.2mm, which acquires three-dimensional images of the arterial microstructures via helical scanning with an ...
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    3. Cross‐scanning optical coherence tomography angiography for eye motion correction

      Cross‐scanning optical coherence tomography angiography for eye motion correction
      We propose a cross‐scanning optical coherence tomography (CS‐OCT) system to correct eye motion artifacts in OCT angiography images. This system employs a dual illumination configuration with two orthogonally polarized beams, each of which simultaneously perform raster scanning in perpendicular direction with each other over the same area. In the reference arm, a polarization delay unit is used to acquire the two orthogonally polarized interferograms with a single photodetector ...
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      Mentions: Korea University
    4. Clinical Implications of Suspended Scattering Particles in Motion Observed by Optical Coherence Tomography Angiography

      Clinical Implications of Suspended Scattering Particles in Motion Observed by Optical Coherence Tomography Angiography
      The objective of this study was to investigate the relationship between suspended scattering particles in motion (SSPiM) in optical coherence tomography angiography (OCTA) and treatment response in diabetic macular edema (DME). We retrospectively reviewed the medical records of patients diagnosed with DME who had undergone intravitreal injection. The optical density ratio (ODR) of the intraretinal cyst and the numbers of hyperreflective foci from OCT images and SSPiM from OCTA images ...
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    5. Characteristics of diffuse retinal nerve fiber layer defects in red-free photographs as observed in optical coherence tomography en face images

      Characteristics of diffuse retinal nerve fiber layer defects in red-free photographs as observed in optical coherence tomography en face images
      Backgroud To determine whether diffuse retinal nerve fiber layer (RNFL) defects, identified on red-free fundus photographs, could be identified on optical coherence tomography (OCT) en face structural images and to evaluate which factors are related to the different recognition patterns on en face images. Methods This retrospective, cross-sectional study included open-angle glaucoma eyes with diffuse RNFL defects in the inferior hemifield, identified in red-free photographs. The corresponding OCT en face ...
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      Mentions: Korea University
    6. Visualising ganglion cell layer based on image entropy optimisation for adaptive contrast enhancement

      Visualising ganglion cell layer based on image entropy optimisation for adaptive contrast enhancement
      Optical coherence tomography cannot easily be used for visual identification of the ganglion cell layer (GCL) for diagnosing retinal diseases owing to the extremely low image contrast between adjacent layers. To solve this problem, the authors used a limit-clipping optimisation method along with the image entropy to enhance the image contrast of targeted layers. As a result, the GCL was successfully extracted using an intelligent tracking system without impacting the ...
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    7. Localized Retinal Nerve Fiber Layer Defect Location Among Red-free Fundus Photographs, En Face Structural Images, and Cirrus HD-OCT Maps

      Localized Retinal Nerve Fiber Layer Defect Location Among Red-free Fundus Photographs, En Face Structural Images, and Cirrus HD-OCT Maps
      Precis: Although the localized retinal nerve fiber layer (RNFL) defects in the en face structural images showed excellent topographic correlation with those in red-free photographs, the RNFL defect was frequently misidentified by the optical coherence tomography (OCT) deviation map. Purpose: The purpose of this study was to compare the location of localized RNFL defects using red-free fundus photographs, OCT en face structural images, and OCT RNFL deviation and thickness maps ...
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      Mentions: Korea University
    8. Features of the choriocapillaris on four different optical coherence tomography angiography devices

      Features of the choriocapillaris on four different optical coherence tomography angiography devices
      Purpose To investigate the features of the choriocapillaris using four different optical coherence tomography angiography (OCTA) devices. Methods OCTA images of the choriocapillaris from consecutive healthy subjects were obtained with four different OCTA devices (Zeiss PLEX Elite, Topcon DRI OCT-1 Atlantis, Zeiss AngioPlex, and Heidelberg Spectralis OCTA). The 33 mm OCTA images were processed with ImageJ. The mean vascular density and mean flow void area of the choriocapillaris were compared ...
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    9. Deep Neural Network Regression for Automated Retinal Layer Segmentation in Optical Coherence Tomography Images

      Deep Neural Network Regression for Automated Retinal Layer Segmentation in Optical Coherence Tomography Images
      Segmenting the retinal layers in optical coherence tomography (OCT) images helps to quantify the layer information in early diagnosis of retinal diseases, which are the main cause of permanent blindness. Thus, the segmentation process plays a critical role in preventing vision impairment. However, because there is a lack of practical automated techniques, expert ophthalmologists still have to manually segment the retinal layers. In this study, we propose an automated segmentation ...
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      Mentions: Korea University
    10. Analysis of new attachment site in medial rectus resection with advancement using anterior segment optical coherence tomography

      Analysis of new attachment site in medial rectus resection with advancement using anterior segment optical coherence tomography
      Objective To evaluate the surgical outcome of unilateral medial rectus resection with small advancement for recurrent exotropia , 30 prism diopters (PD), and verify new attachment site anatomically using anterior segment optical coherence tomography (ASOCT). Method This study is a retrospective chart review of patients who underwent 1.0mm advancement of unilateral resected medial rectus from original medial rectus (OMR) insertion for recurrent exotropia since 2014. The age at operation, sex ...
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      Mentions: Korea University
    11. Inter-relationship between retinal and choroidal vasculatures using optical coherence tomography angiography in normal eyes

      Inter-relationship between retinal and choroidal vasculatures using optical coherence tomography angiography in normal eyes
      Purpose: To quantify vascular and structural macular variables in healthy eyes and to investigate correlations between these variables and age using optical coherence tomography angiography. Materials and methods: A total of 261 eyes of 261 subjects with normal fundus were included. Central macular thickness, ganglion cell layer to inner plexiform layer thickness, outer retina layer thickness, subfoveal choroidal thickness, and choroidal vascularity index were measured using optical coherence tomography. Foveal ...
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      Mentions: Korea University
    12. Heterogeneous Computation on Mobile Processor for Real-time Signal Processing and Visualization of Optical Coherence Tomography Images

      Heterogeneous Computation on Mobile Processor for Real-time Signal Processing and Visualization of Optical Coherence Tomography Images
      We have developed a high-performance signal-processing and image-rendering heterogeneous computation system for optical coherence tomography (OCT) on mobile processor. In this paper, we reveal it by demonstrating real-time OCT image processing using a Snapdragon 800 mobile processor, with the introduction of a heterogeneous image visualization architecture (HIVA) to accelerate the signal-processing and image-visualization procedures. HIVA has been designed to maximize the computational performances of a mobile processor by using a ...
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      Mentions: Korea University
    13. Comprehensive intravascular imaging of atherosclerotic plaque in vivo using optical coherence tomography and fluorescence lifetime imaging

      Comprehensive intravascular imaging of atherosclerotic plaque in vivo using optical coherence tomography and fluorescence lifetime imaging
      Comprehensive imaging of both the structural and biochemical characteristics of atherosclerotic plaque is essential for the diagnosis and study of coronary artery disease because both a plaques morphology and its biochemical composition affect the level of risk it poses. Optical coherence tomography (OCT) and fluorescence lifetime imaging (FLIm) are promising optical imaging methods for characterizing coronary artery plaques morphologically and biochemically, respectively. In this study, we present a hybrid intravascular ...
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    14. Multispectral analog-mean-delay fluorescence lifetime imaging combined with optical coherence tomography

      Multispectral analog-mean-delay fluorescence lifetime imaging combined with optical coherence tomography
      The pathophysiological progression of chronic diseases, including atherosclerosis and cancer, is closely related to compositional changes in biological tissues containing endogenous fluorophores such as collagen, elastin, and NADH, which exhibit strong autofluorescence under ultraviolet excitation. Fluorescence lifetime imaging (FLIm) provides robust detection of the compositional changes by measuring fluorescence lifetime, which is an inherent property of a fluorophore. In this paper, we present a dual-modality system combining a multispectral analog-mean-delay ...
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    15. Full ocular biometry through dual-depth whole-eye optical coherence tomography

      Full ocular biometry through dual-depth whole-eye optical coherence tomography
      We propose a new method of determining the optical axis (OA), pupillary axis (PA), and visual axis (VA) of the human eye by using dual-depth whole-eye optical coherence tomography (OCT). These axes, as well as the angles between the OA and VA and between PA and VA, are important in many ophthalmologic applications, especially in refractive surgery. Whole-eye images are reconstructed based on simultaneously acquired images of the anterior segment ...
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      Mentions: Korea University
    16. Choriocapillaris layer imaging with swept-source optical coherence tomography angiography in lamellar and full-thickness macular hole

      Choriocapillaris layer imaging with swept-source optical coherence tomography angiography in lamellar and full-thickness macular hole
      Purpose To present characteristics of choriocapillaris layer imaging with swept-source optical coherence tomography angiography (SS-OCTA) in eyes with macular hole (MH). Methods Patients with MH were included. Vascular density of choriocapillaris (VDC) and central flow void areas were obtained using SS-OCTA. Data were compared with age- and gender-matched normal controls. Results Fifty-one patients with MH and 51 controls were included. Among the 51 patients with MH, 19 had lamellar MH ...
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      Mentions: Korea University
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  2. About Korea University

    Korea University

    Korea University is a private research university located primarily in Seoul, South Korea, and a member of the SKY (universities). It was founded by Lee Yong-ik in the present-day town of Anam in 1905. The university is the oldest institution of higher education in South Korea. Korea University is a comprehensive research institution consisting of 81 academic departments in 15 colleges and 75 research institutes.  Korea University College of Medicine.