Articles that mention Gwangju Institute of Science and Technology -Optical Coherence Tomography News

Gwangju Institute of Science and Technology

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1. Mentioned In 85 Articles
2. Angiographic Imaging of an In Vivo Mouse Brain as a Guiding Star for Automatic Digital Refocusing in OCT
  
  Explore MDPI Open Access Journals Platform Feb 11 2020 Ophthalmology
  
  A method allows the extraction of the recovery factor that maximizes the image contrast of OCT (optical coherence tomography) and/or OCTA (OCT angiography) of a living subject is proposed in this study. Due to the finite depth of focus in imaging optics, the volume OCT imaging suffers from blurriness in the lateral resolution. By utilizing the digital hologram method or angular spectrum method, the blurred image can be refocused ...
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  Mentions: Byeong Ha Lee Gwangju Institute of Science and Technology Kwan Seob Park
3. Post-Processing Method for Image Reconstruction Enhancement in Integrating-Bucket-Based Full-Field Optical Coherence Tomography
  
  Explore MDPI Open Access Journals Platform Jan 30 2020
  
  An integrating-bucket method is widely used as a reconstruction tool for full-field optical coherence tomography (FF-OCT). However, it requires high-precision adjustments of the phase modulation parameters. If the parameters are not optimal, the reconstructed tomogram will incur severe artifacts. We propose a post-processing method for removing or reducing such artifacts by utilizing a correction factor extracted from a pre-reconstructed tomogram. FF-OCT imaging created using a coin verifies the effectiveness of ...
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  Mentions: Gwangju Institute of Science and Technology
4. Identification of Fungus-infected Tomato Seeds Based on Full-Field Optical Coherence Tomography
  
  Explore OSA | OSA Publishing Jan 7 2020 NDE/NDT , Other Non-Medical
  
  The morphological changes of anthracnose (fungus) -infected tomato seeds have been studied to identify the infection and characterize its effect. Full-field optical coherence tomography (FF-OCT) has been utilized as a nondestructive but efficient modality for visualizing the effects of fungal infection. The cross-sectional images extracted from a stack of en face FF-OCT images showed significant changes with infection in the seed structure. First of all, the seed coat disappeared with ...
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  Mentions: Byeong Ha Lee Gwangju Institute of Science and Technology
5. Buffered polarization diverse detection for single-camera polarization-sensitive optical coherence tomography
  
  Explore OSA | OSA Publishing Nov 28 2019
  
  Herein we propose a method to mitigate a position mismatch problem for a spectral-domain polarization-sensitive optical coherence tomography (SD-PS-OCT) system that uses a single line-scan detection scheme. A single detector-based PS-OCT detects two orthogonal polarization components as two adjacent A-scan signals in turns. Thus, two adjacent A-scan signals are not scattered at a fixed point in time (position mismatch problem), resulting in uncorrelated signals between them. To achieve sequential detection ...
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  Mentions: Gwangju Institute of Science and Technology Kwan Seob Park Jun Geun Shin
6. Microscope-mounted intraoperative optical coherence tomography with actively tunable focus and optical path length
  
  Explore SPIE Digital Library Apr 16 2018
  
  We present a method for an intraoperative microscope-mounted Fourier-domain optical coherence tomography (FD-OCT) system to maintain high image contrast while dynamic adjusting focal planes. Because two imaging system with different imaging depth are integrated into one system, active control of OCT imaging conditions is indispensible for functioning high quality imaging modality. For the purpose of active adjustment of the focal plane, an electrically focus tunable lens (FTL) was used in ...
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  Mentions: Gwangju Institute of Science and Technology Tae Joong Eom
7. Quantitative discrimination of pearls using polarization-sensitive optical coherence tomography
  
  Explore OSA | OSA Publishing Mar 14 2018 NDE/NDT
  
  We propose a robust method that can quantitatively discriminate genuine pearls from imitation ones by introducing the concept of entropy in the polarization-sensitive optical coherence tomography (PS-OCT). Qualitatively, by examining the birefringence properties of the nacre region of pearls with PS-OCT, the genuine pearls can be easily discriminated. To quantify the amount of birefringence formation, however, the concept of phase retardation entropy is introduced, which is expected to have a ...
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  Mentions: Byeong Ha Lee Gwangju Institute of Science and Technology Hae Yeon Kim
8. In vivo three-dimensional imaging of human corneal nerves using Fourier-domain optical coherence tomography
  
  Explore SPIE | Journal Jan 6 2017 Ophthalmology
  
  We have employed Fourier-domain optical coherence tomography (FD-OCT) to achieve corneal nerve imaging, which could be useful in surgical planning and refractive surgery. Because the three-dimensional (3-D) images of the corneal nerves were acquiredin vivo, unintentional movement of the subject during the measurement led to imaging artifacts. These artifacts were compensated for with a series of signal processing techniques, namely realigning A-scan images to flatten the boundary and cross-correlating adjacent ...
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  Mentions: Byeong Ha Lee Gwangju Institute of Science and Technology Jun Geun Shin
9. Examination of Gland Dropout Detected on Infrared Meibography by Using Optical Coherence Tomography Meibography
  
  Explore ScienceDirect Nov 9 2016
  
  Purpose To elucidate the anatomic details of gland dropout detected on two-dimensional infrared (IR) meibography in cases of dry eye associated with meibomian gland dysfunction (MGD) by using three-dimensional optical coherence tomography (OCT) meibography. Methods In this cross-sectional, observational case series, we enrolled gland dropout detected on IR meibography; the condition was then examined using a real-time swept-source OCT system. Accordingly, a series of 500 raster B-scan OCT images, with ...
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  Mentions: University of Rochester Byeong Ha Lee Gwangju Institute of Science and Technology
10. An All-Fiber-Optic Combined System of Noncontact Photoacoustic Tomography and Optical Coherence Tomography
  
  Explore MDPI Open Access Journals Platform May 24 2016
  
  We propose an all-fiber-based dual-modal imaging system that combines noncontact photoacoustic tomography (PAT) and optical coherence tomography (OCT). The PAT remotely measures photoacoustic (PA) signals with a 1550-nm laser on the surface of a sample by utilizing a fiber interferometer as an ultrasound detector. The fiber-based OCT, employing a swept-source laser centered at 1310 nm, shares the sample arm of the PAT system. The fiber-optic probe for the combined system ...
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  Mentions: Byeong Ha Lee Gwangju Institute of Science and Technology Jonghyun Eom
11. An All-Fiber-Optic Combined System of Noncontact Photoacoustic Tomography and Optical Coherence Tomography
  
  Explore MDPI Open Access Journals Platform May 20 2016
  
  We propose an all-fiber-based dual-modal imaging system that combines noncontact photoacoustic tomography (PAT) and optical coherence tomography (OCT). The PAT remotely measures photoacoustic (PA) signals with a 1550-nm laser on the surface of a sample by utilizing a fiber interferometer as an ultrasound detector. The fiber-based OCT, employing a swept-source laser centered at 1310 nm, shares the sample arm of the PAT system. The fiber-optic probe for the combined system ...
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  Mentions: Byeong Ha Lee Gwangju Institute of Science and Technology Jonghyun Eom
12. All optical fiber combined-imaging system of photoacoustic and optical coherence tomography
  
  Explore Conference Proceedings Apr 1 2016
  
  We present an all optical fiber combined-imaging system that integrates non-contact photoacoustic tomography (NPAT) and optical coherence tomography (OCT) to simultaneously provide PA and OCT images. The fiber-based PAT system utilizing a Mach-Zehnder interferometer with a fiber laser of 1550 nm measures the photoacoustic signal at the sample surface. For the generation of a PA signal, a pulse train from a bulk type Nd:YAG laser illuminates the sample via ...
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  Mentions: Byeong Ha Lee Gwangju Institute of Science and Technology Jonghyun Eom
13. Optical coherence tomography application by using optical phase shift based on fiber optic sensor
  
  Explore Conference Proceedings Mar 15 2016
  
  We demonstrate fiber-optic sensor applications to full-range complex optical coherence tomography (OCT). To extend imaging range in OCT, real value or interferogram measured from an interferometer is needed to convert into complex value. For the purpose, various treatments such as mechanical, electro-optical, optical and programming based methods have been exploited in the interferometer. To make complex signal in fiber-optic interferometer, we propose vibrationbased optical phase shifting method. The proposed method ...
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  Mentions: Gwangju Institute of Science and Technology Tae Joong Eom
14. Efficient trigger signal generation from wasted backward amplified stimulated emission at optical amplifiers for optical coherence tomography
  
  Explore MATEC Web of Conferences Dec 5 2015
  
  This paper propose an optical structure to generate trigger signals for optical coherence tomography (OCT) using backward light which is usually disposed. The backward light is called backward amplified stimulated emission generated from semiconductor optical amplifier (SOA) when using swept wavelength tunable laser (SWTL). A circulator is applied to block undesirable lights in the SWTL instead of an isolator in common SWTL. The circulator also diverts backward amplified spontaneous lights ...
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  Mentions: Gwangju Institute of Science and Technology Tae Joong Eom
15. In vivo wide-field reflectance/fluorescence imaging and polarization-sensitive optical coherence tomography of human oral cavity with a forward-viewing probe
  
  Explore opticsinfobase.org Jan 18 2015 Probes
  
  We report multimodal imaging of human oral cavity in vivo based on simultaneous wide-field reflectance/fluorescence imaging and polarization-sensitive optical coherence tomography (PS-OCT) with a forward-viewing imaging probe. Wide-field reflectance/fluorescence imaging and PS-OCT were to provide both morphological and fluorescence information on the surface, and structural and birefringent information below the surface respectively. The forward-viewing probe was designed to access the oral cavity through the mouth with dimensions of ...
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  Mentions: Ki Hean Kim Gwangju Institute of Science and Technology Taejun Wang
16. Short cavity active mode locking fiber laser for optical sensing and imaging
  
  Explore Conference Proceedings Jun 10 2014 Broadband Sources
  
  We demonstrate a highly linear wavenumber- swept active mode locking (AML) fiber laser for optical sensing and imaging without any wavenumber-space resampling process. In this all-electric AML wavenumber-swept mechanism, a conventional wavelength selection filter is eliminated and, instead, the suitable programmed electric modulation signal is directly applied to the gain medium. Various types of wavenumber (or wavelength) tunings can be implemented because of the filter-less cavity configuration. Therefore, we successfully ...
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  Mentions: Byeong Ha Lee Myung Yung Jeong Chang-Seok Kim
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