Articles that mention Kyungpook National University -Optical Coherence Tomography News

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2. Integrated Quad-Scanner Strategy-Based Optical Coherence Tomography for the Whole-Directional Volumetric Imaging of a Sample
  
  Explore MDPI Open Access Journals Platform Feb 16 2021
  
  Whole-directional scanning methodology is required to observe distinctive features of an entire physical structure with a three dimensional (3D) visualization. However, the implementation of whole-directional scanning is challenging for conventional optical coherence tomography (OCT), which scans a limited portion of the sample by utilizing unidirectional and bidirectional scanning methods. Therefore, in this paper an integrated quad-scanner (QS) strategy-based OCT method was implemented to obtain the whole-directional volumetry of a sample ...
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  Mentions: Jeehyun Kim Kyungpook National University Ruchire Eranga Wijesinghe
3. Identification of Organs Inside Hard Tick Body Using Spectral-domain Optical Coherence Tomography
  
  Explore ScienceDirect Jan 24 2021 NDE/NDT , Other Non-Medical
  
  Ixodidae tick, also known as a hard tick, is one of the major vectors of various tick-borne diseases. Studying its anatomy is the fundamental approach for diverse acarological studies and the key to understanding tick morphology. However, the conventional methods of observing internal organs rely primarily on dissection, which damages specimens irrecoverably. In this study, we developed an optical coherence tomography (OCT) system to non-invasively investigate the morphological characteristics of ...
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  Mentions: Kyungpook National University Naresh Kumar Ravichandran Ruchire Eranga Wijesinghe
4. A preliminary study of post-progressive nail-art effects on in vivo nail plate using optical coherence tomography-based intensity profiling assessment
  
  Explore Nature Publishing Group Jan 14 2021 Dermatology
  
  Nail beautification is a widely applied gender independent practice. Excessive nail beautifications and nail-arts have a direct impact on the nail structure and can cause nail disorders. Therefore, the assessment of post-progressive nail-art effects on the nail is essential to maintain optimal nail health and to avoid any undesirable disorders. In this study, in vivo nails were examined in control stage, with a nail-art stage, and after removing the nail-art ...
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  Mentions: Jeehyun Kim Kyungpook National University Ruchire Eranga Wijesinghe
5. Optical Coherence Tomography for Quantifying Human Cutaneous Chronic Graft-versus-Host Disease: OCT for cGvHD
  
  Explore ScienceDirect Dec 30 2020 Ophthalmology
  
  Chronic graft versus host disease (cGvHD) is the most common cause of non-relapse mortality after allogeneic hematopoietic cell transplant (alloHCT). Cutaneous cGvHD is characterized by thickening of the skin and connective tissues resulting in discomfort and limitations in mobility. Current assessments of these skin lesions are based on physical examination of their thickening, pinchability, and movability. Optical coherence tomography (OCT) is a non-invasive, high-resolution technique using near infra-red light to ...
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  Mentions: Changho Lee Kyungpook National University Mansik Jeon
6. Vision-Inspection-Synchronized Dual Optical Coherence Tomography for High-Resolution Real-Time Multidimensional Defect Tracking in Optical Thin Film Industry
  
  Explore IEEE Xplore Oct 31 2020 NDE/NDT
  
  Large-scale product inspection is an important aspect in thin film industry to identify defects with a high precision. Although vision line scan camera (VLSC)-based inspection has been frequently implemented, it is limited to surface inspections. Therefore, to overcome the conventional drawbacks, there is a need to extend inspection capabilities to internal structures. Considering that VLSC systems have access to rich information, such as color and texture, high-resolution real-time multimodal ...
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  Mentions: University of Ulsan Jeehyun Kim Kyungpook National University
7. Multi-directional Morphological Assessment of Single Bacterial Colonies Through Non-invasive Optical Imaging
  
  Explore Home - Springer Oct 31 2020 Microscopy
  
  A bacterium in bacterial colony is a basal component of bacterial studies and is therefore of considerable importance. The morphological characteristics of a single colony have been widely used as the standard to identify diverse bacterial species. However, the conventional methods for obtaining morphological information, such as microscopic techniques, cannot provide tomographic views. This study utilizes spectral-domain optical coherence tomography (SD-OCT) to observe both external and internal structures for single ...
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  Mentions: Jeehyun Kim Kyungpook National University Ruchire Eranga Wijesinghe
8. Fabrication of Dental Crown by Optical Coherence Tomography: A Pilot Study
  
  Explore IEEE Xplore Aug 18 2020 Dentistry
  
  Digital impressions have been studied for better gingival retraction in including the under subgingival finish line condition. Here, we employed swept-source optical coherence tomography (SS-OCT) of 1310 nm wavelength, which is capable of noninvasive, high-resolution, and high-speed, to discern the utilization-possibility for supporting the fabrication of the dental crown. A three-dimensional (3D) abutment was used at the 0.5 mm of the subgingival finish line below the level of the ...
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  Mentions: Jeehyun Kim Kyungpook National University Mansik Jeon
9. Non-invasive optical screening of Streptococcus Pneumonia based inflammatory changes of the tympanic membrane and mastoid mucosa in guinea pig otitis media using optical coherence tomography
  
  Explore IEEE Xplore Aug 5 2020 Otolaryngology
  
  Abstract: The accurate screening of otitis media (OM) lies in clarifying the numerous confounding and quantitative factors that are discovered during primary inspections. Increased awareness about bacterial biofilms and inflammation has allowed researchers to develop a better understanding of the bacterial infections that occur in the middle ear. In this study, four live guinea pigs were inoculated with Streptococcus pneumonia to induce OM-related inflammatory changes. Since optical techniques have been ...
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  Mentions: Jeehyun Kim Kyungpook National University Jeong Hun Jang
10. Assessment of the Inner Surface Roughness of 3D Printed Dental Crowns via Optical Coherence Tomography Using a Roughness Quantification Algorithm
  
  Explore IEEE Xplore Aug 3 2020 Dentistry
  
  Abstract: Dental crowns are used to restore decayed or chipped teeth, where their surfaces play a key role in this restoration process, as they affect the fitting and stable bonding of the prostheses. The surface texture of crowns can interfere with this restoration process, therefore the measurement of their inner surface roughness is very important but difficult to achieve using conventional imaging methods. In this study, the inner surfaces of ...
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  Mentions: Jeehyun Kim Kyungpook National University Ruchire Eranga Wijesinghe
11. Dynamic compensation of path length difference in optical coherence tomography by an automatic temperature control system of optical fiber
  
  Explore IEEE Xplore May 5 2020
  
  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
12. Optical Interferometric Fringe Pattern-Incorporated Spectrum Calibration Technique for Enhanced Sensitivity of Spectral Domain Optical Coherence Tomography
  
  Explore MDPI Open Access Journals Platform Apr 12 2020
  
  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
13. Identification of multi-dimensional thread geometry using depth-resolved swept-source optical coherence tomography for assessment of dental implant fabrication
  
  Explore ScienceDirect Dec 3 2019 Dentistry
  
  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
14. Measurement of Vibrating Tympanic Membrane in an In Vivo Mouse Model Using Doppler Optical Coherence Tomography
  
  Explore MDPI Open Access Journals Platform Sep 10 2019 Otolaryngology
  
  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
15. An averaged intensity difference detection algorithm for identification of human gingival sulcus in optical coherence tomography images
  
  Explore IEEE Xplore Jun 4 2019
  
  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
16. A Comparison Study of Marginal and Internal Fit Assessment Methods for Fixed Dental Prostheses
  
  Explore MDPI Open Access Journals Platform Jun 1 2019 Dentistry
  
  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
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