1. Kyungpook National University

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    1. Mentioned In 82 Articles

    2. Dynamic compensation of path length difference in optical coherence tomography by an automatic temperature control system of optical fiber

      Explore IEEE Xplore
      Dynamic compensation of path length difference in optical coherence tomography by an automatic temperature control system of optical fiber
      Optical fiber is widely used in optical coherence tomography (OCT) to propagate light precisely with low attenuation and low dispersion. However, the total optical path length within the optical fiber varies in accordance with changes of the temperature. This leads changes in the total optical travel path of the interfering signals and results in shifting of OCT image position to an unintended depth pixel value. In this paper, we presented ...
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      Mentions: Jeehyun Kim Kyungpook National University Naresh Kumar Ravichandran

    3. Optical Interferometric Fringe Pattern-Incorporated Spectrum Calibration Technique for Enhanced Sensitivity of Spectral Domain Optical Coherence Tomography

      Explore MDPI Open Access Journals Platform
      Optical Interferometric Fringe Pattern-Incorporated Spectrum Calibration Technique for Enhanced Sensitivity of Spectral Domain Optical Coherence Tomography
      Depth-visualizing sensitivity can be degraded due to imperfect optical alignment and non-equidistant distribution of optical signals in the pixel array, which requires a measurement of the re-sampling process. To enhance this depth-visualizing sensitivity, reference and sample arm-channeled spectra corresponding to different depths using mirrors were obtained to calibrate the spectrum sampling prior to Fourier transformation. During the process, eight interferogram patterns corresponding to point spread function (PSF) signals at eight ...
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      Mentions: Jeehyun Kim Kyungpook National University Ruchire Eranga Wijesinghe

    4. Identification of multi-dimensional thread geometry using depth-resolved swept-source optical coherence tomography for assessment of dental implant fabrication

      Explore ScienceDirect Dentistry
      Identification of multi-dimensional thread geometry using depth-resolved swept-source optical coherence tomography for assessment of dental implant fabrication
      The geometrical characteristics of dental implants, such as thread depth and width, facing angle, pitch, and surface roughness, are important to assess their stability and osseointegration after implant surgery. Herein, we demonstrate the potential use of depth-resolved swept-source optical coherence tomography (SS-OCT) to assess the structural quality of widely used dental implants. The implemented SS-OCT system was centered at a wavelength of 1300 nm with a 100 nm full-width at ...
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      Mentions: Jeehyun Kim Kyungpook National University Ruchire Eranga Wijesinghe

    5. Measurement of Vibrating Tympanic Membrane in an In Vivo Mouse Model Using Doppler Optical Coherence Tomography

      Explore MDPI Open Access Journals Platform Otolaryngology
      Measurement of Vibrating Tympanic Membrane in an In Vivo Mouse Model Using Doppler Optical Coherence Tomography
      Optical coherence tomography (OCT) has a micro-resolution with a penetration depth of about 2 mm and field of view of about 10 mm. This makes OCT well suited for analyzing the anatomical and internal structural assessment of the middle ear. To study the vibratory motion of the tympanic membrane (TM) and its internal structure, we developed a phase-resolved Doppler OCT system using Kasais autocorrelation algorithm. Doppler optical coherence tomography is ...
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      Mentions: Jeehyun Kim Kyungpook National University Mansik Jeon

    6. An averaged intensity difference detection algorithm for identification of human gingival sulcus in optical coherence tomography images

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      An averaged intensity difference detection algorithm for identification of human gingival sulcus in optical coherence tomography images
      In the past decade, there has been an increase in the development of sensitive, highresolution, non-invasive diagnostic methods for periodontic diseases. Optical coherence tomography (OCT) has attracted considerable attention in clinical settings. In this study, a reliable, robust algorithm for the detection of gingival sulcus in 2D OCT cross-sectional images is proposed. Previously, the measurement of gingival sulcus in OCT images has been performed by manual identification using two-dimensional (2D ...
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      Mentions: Jeehyun Kim Kyungpook National University Naresh Kumar Ravichandran

    7. A Comparison Study of Marginal and Internal Fit Assessment Methods for Fixed Dental Prostheses

      Explore MDPI Open Access Journals Platform Dentistry
      A Comparison Study of Marginal and Internal Fit Assessment Methods for Fixed Dental Prostheses
      Numerous studies have previously evaluated the marginal and internal fit of fixed prostheses; however, few reports have performed an objective comparison of the various methods used for their assessment. The purpose of this study was to compare five marginal and internal fit assessment methods for fixed prostheses. A specially designed sample was used to measure the marginal and internal fit of the prosthesis according to the cross-sectional method (CSM), silicone ...
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      Mentions: Kyungpook National University Mansik Jeon

    8. Intravascular modality‐guided versus angiography‐guided percutaneous coronary intervention in acute myocardial infarction

      Explore Wiley Online Library Cardiology
      Intravascular modality‐guided versus angiography‐guided percutaneous coronary intervention in acute myocardial infarction
      Background Few data are available for current usage patterns of intravascular modalities such as intravascular ultrasound (IVUS), optical coherence tomography (OCT), and fractional flow reserve (FFR) in acute myocardial infarction (AMI). Moreover, patient and procedural‐based outcomes related to intravascular modality guidance compared to angiography guidance have not been fully investigated yet. Methods We examined 11,731 patients who underwent percutaneous coronary intervention (PCI) from the Korea AMI RegistryNational Institute ...
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      Mentions: National Institutes of Health Kyungpook National University

    9. Non-Invasive Morphological Characterization of Rice Leaf Bulliform and Aerenchyma Cellular Regions Using Low Coherence Interferometry

      Explore MDPI Open Access Journals Platform NDE/NDT
      Non-Invasive Morphological Characterization of Rice Leaf Bulliform and Aerenchyma Cellular Regions Using Low Coherence Interferometry
      Non-invasive investigation of rice leaf specimens to characterize the morphological formation and particular structural information that is beneficial for agricultural perspective was demonstrated using a low coherence interferometric method called swept source optical coherence tomography (SS-OCT). The acquired results non-invasively revealed morphological properties of rice leaf, such as bulliform cells; aerenchyma, parenchyma, and collenchyma layer; and vascular bundle. Beside aforementioned morphologic characteristics, several leaf characteristics associated with cytological mechanisms of ...
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      Mentions: Jeehyun Kim Kyungpook National University Ruchire Eranga Wijesinghe

    10. Analysis of Enamel Loss by Prophylaxis and Etching Treatment in Human Tooth Using Optical Coherence Tomography: An In Vitro Study

      Explore Hindawi Publishing Corporation Dentistry
      Analysis of Enamel Loss by Prophylaxis and Etching Treatment in Human Tooth Using Optical Coherence Tomography: An In Vitro Study
      Bonding of braces is an essential part in contemporary orthodontic treatment. For the proper strength of bracket bonding, enamel conditioning or surface treatment on tooth surface is required. Treatment on the tooth surface such as prophylaxis smoothing with pumice and enamel etching results in considerable damages to the enamel surface of the tooth. In this study, we have proposed optical coherence tomography as a noninvasive imaging technique for the evaluation ...
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      Mentions: Jeehyun Kim Kyungpook National University Naresh Kumar Ravichandran

    11. 3-Dimensional characterization of cortical bone microdamage following placement of orthodontic microimplants using Optical Coherence Tomography

      Explore Nature Publishing Group
      3-Dimensional characterization of cortical bone microdamage following placement of orthodontic microimplants using Optical Coherence Tomography
      Microimplants are being used extensively in clinical practice to achieve absolute anchorage. Success of microimplant mainly depend on its primary stability onto the cortical bone surface and the associated Microdamage of the cortical bone during insertion procedure leads to many a microimplants to fail and dislodge from the cortical bone leading to its failure. Even though, previous studies showed occurrence of microdamage in the cortical bone, they were mainly 2-dimension ...
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      Mentions: Jeehyun Kim Kyungpook National University Naresh Kumar Ravichandran

    12. Microperimetry in age-related macular degeneration: association with macular morphology assessed by optical coherence tomography

      Explore BJO Online Ophthalmology
      Microperimetry in age-related macular degeneration: association with macular morphology assessed by optical coherence tomography
      Background/aims Microperimetry is a technique that is increasingly used to assess visual function in age-related macular degeneration (AMD). In this study, we aimed to evaluate the relationship between retinal sensitivity measured with macular integrity assessment (MAIA) microperimetry and optical coherence tomography (OCT)-based macular morphology in AMD. Methods Prospective, cross-sectional study. All participants were imaged with colour fundus photographs used for AMD staging (Age-Related Eye Disease Study scale), spectral-domain ...
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      Mentions: Topcon Medical Systems Harvard University Massachusetts Eye and Ear Infirmary

    13. Non-ionized, High-resolution Measurement of Internal and Marginal Discrepancies of Dental Prosthesis Using Optical Coherence Tomography

      Explore IEEE Xplore Dentistry
      Non-ionized, High-resolution Measurement of Internal and Marginal Discrepancies of Dental Prosthesis Using Optical Coherence Tomography
      An internal and marginal fit between prosthesis and abutment are important factors of the durability of dental prosthesis. In this study we have proposed the use of swept-source optical coherence tomography (SS-OCT) as a novel application for non-ionized and high-resolution measurements of internal and marginal discrepancies at anatomically critical four points, such as occlusal, angle, axial, and margin during prosthesis attachment. A tooth model was fabricated by 3D printing technique ...
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      Mentions: Kyungpook National University Ruchire Eranga Wijesinghe

    14. Clinical Utility of Intraoperative Tympanomastoidectomy Assessment Using a Surgical Microscope Integrated with an Optical Coherence Tomography

      Explore Nature Publishing Group Otolaryngology
      Clinical Utility of Intraoperative Tympanomastoidectomy Assessment Using a Surgical Microscope Integrated with an Optical Coherence Tomography
      Significant technical and optical advances are required for intraoperative optical coherence tomography (OCT) to be utilized during otological surgeries. Integrating OCT with surgical microscopy makes it possible to evaluate soft tissue in real-time and at a high resolution. Herein, we describe an augmented-reality, intraoperative OCT/microscope system with an extended working distance of 280mm, providing more space for surgical manipulation than conventional techniques. We initially performed ex vivo experiments to ...
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      Mentions: Superlum Ajou University Jeehyun Kim

    15. Non-destructive identification of weld-boundary and porosity formation during laser transmission welding by using optical coherence tomography

      Explore IEEE Xplore NDE/NDT
      Non-destructive identification of weld-boundary and porosity formation during laser transmission welding by using optical coherence tomography
      Laser transmission welding offers significant benefits over conventional welding techniques enabling single-stage rapid plastic joining. The quality of laser transmission welded products are commonly assessed by measuring the weld penetration depth, hardened weld boundary, and inspecting the formation of porosity. However, existing methods of verification are inevitably accompanied by destruction of the specimen. Thus, non-destructive quality assessment methods for laser transmission welding have gained attention recently. Here, we demonstrated an ...
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      Mentions: Jeehyun Kim Kyungpook National University Ruchire Eranga Wijesinghe

    16. Biophotonic approach for the characterization of initial bitter-rot progression on apple specimens using optical coherence tomography assessments

      Explore Nature Publishing Group NDE/NDT , Other Non-Medical
      Biophotonic approach for the characterization of initial bitter-rot progression on apple specimens using optical coherence tomography assessments
      The tremendous advances achieved in the biophotonics technologies have intensified the necessity for non-invasive modalities that can characterize diverse biological materials with increased sensitivity and resolution. Optical coherence tomography (OCT) is one of the techniques that has been applied for biological applications in medicine and agriculture to identify structural properties. Herein, we report the successful incorporation of OCT for the identification of morphological changes that occur as a result of ...
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      Mentions: Jeehyun Kim Kyungpook National University Naresh Kumar Ravichandran
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  4. About Kyungpook National University

    Kyungpook National University

    Kyungpook National University (KNU), is a leading national university in Daegu, South Korea. The university is one of 10 Flagship Korean National Universities. It is one of the three best recognized and oldest national universities with Seoul National University and Pusan National University. The university was established in September 1946, succeeding the former Daegu Teacher's College, Daegu Agricultural College, and Daegu Medical College. In 2008, it merged with Sangju National University.

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