Articles from Seon Young Ryu

1. A fiber-based single-unit dual-mode optical Imaging system: Swept source optical coherence tomography and fluorescence spectroscopy

   Explore ScienceDirect Jan 10 2012 Tunable Sources

   

   We propose a fiber optic single-unit but dual-mode optical imaging system that can provide fast cross-sectional imaging capabilities of swept-source optical coherence tomography (SS-OCT) and functional capabilities of fluorescence spectroscopy (FS). By adopting a fiber optic FS system into a fiber-based SS-OCT system, a compact and effective multimodal single-unit SSOCT-FS system could be achieved. Here, the key element of the proposed multimodal imaging system is a specially designed fiber coupler based on double-clad fiber (DCF), which has only cladding-mode coupling capability. The DCF couplers were fabricated with home-drawn DCF by several fabrication methods; a twisting method, a side-polishing method and ...

   Read Full Article

   Comment

   Mentions: Byeong Ha Lee Hae Young Choi Gwangju Institute of Science and Technology

2. Feasibility of Full-field Optical Coherence Microscopy in Ultra-structural Imaging of Human Colon Tissues

   Explore kps.or.kr Jan 16 2011 Gastroenterology , Microscopy

   

   We demonstrated imaging feasibility of full-field optical coherence microscopy (FF-OCM) in pathological diagnosis of human colon tissues. FF-OCM images enabling high transverse resolution were obtained at different depth of the samples without any dye staining and physical slicing and visualized detailed microstructure of the human colon tissues. Morphological differences in normal tissues, cancer tissues and tissues under transition state were observed and matched with results seen in conventional optical microscope images. The optical biopsy based on FF-OCM could overcome the limitations on the number of physical cutting of tissues and perform high-throughput mass diagnosis of diseased tissues. The proved utility ...

   Read Full Article

   Comment

   Mentions: Seon Young Ryu Byeong Ha Lee Gwangju Institute of Science and Technology

3. Ultrawideband photonic crystal fiber coupler for multiband optical imaging system

   Explore opticsinfobase.org Mar 30 2010 Broadband Sources

   

   We report a photonic crystal fiber (PCF) coupler having an ultrawide spectral bandwidth keeping single mode operation. The use of the PCF coupler in a fiber-based optical coherence tomography (OCT) system enables us to handle the wide spectral bands of various light sources, including superluminescent diodes (SLDs) at 1300 nm and 820 nm, Ti:sapphire lasers, and white-light sources. The multiband imaging performances of the PCF-based OCT system are demonstrated by obtaining dental images at 1300 nm and 820 nm with the same setup. In addition, we show that the PCF coupler could cover the spectrum over a one octave ...

   Read Full Article

   Comment

   Mentions: Zhongping Chen Seon Young Ryu Byeong Ha Lee

4. Combined swept-source optical coherence tomography and fluorescence spectroscopy system

   Explore SPIE Digital Library Feb 23 2010

   

   We report a combined swept source optical coherence tomography (SSOCT) and fluorescence spectroscopy (FS) system for multimodal measurements of biochemical information and internal structures with fast imaging speed. The FS probe composed of a double clad fiber (DCF) coupler is adopted into the single mode fiber based SSOCT system. Here, the DCF coupler acts as a FS system as well as a multifunctional probe for the SSOCT-FS system. The performances of the single-unit SSOCT-FS system is confirmed by monitoring the fluorescence signal from photosensitizer in cancerous region of in-vivo rat and by imaging the internal structures of same region with ...

   Read Full Article

   Comment

   Mentions: Seon Young Ryu Byeong Ha Lee Gwangju Institute of Science and Technology

5. Tomographic imaging of incipient dental-caries using optical coherence tomography and comparison with various modalities

   Explore SpringerLink Home Jul 31 2009 Dentistry

   We present the optical coherence tomography (OCT) made to investigate the early dental caries in human teeth and compare its results with those taken by conventional imaging modalities including light illuminating examination (LIE), digital intra-oral radiography (DIOR), and electron probe micro analyzer (EPMA). Morphological features and caries-involved areas of the dental structure were mainly investigated by LIE, DIOR, and OCT to study the infection of the caries lesion in pits and fissures. The biochemical information acquired with EPMA and the morphological features taken with OCT in the early stage of caries were compared and analyzed to present an objective and ...

   Read Full Article

   Comment

   Mentions: Seon Young Ryu Byeong Ha Lee University of Ulsan

6. Single-body lensed-fiber scanning probe actuated by magnetic force for optical imaging

   Explore opticsinfobase.org Jun 11 2009 Probes

   

   We propose a fiber-based hand-held scanning probe suitable for the sample arm of an optical imaging system including optical coherence tomography. To achieve compactness, a single-body lensed-fiber and a solenoid actuator were utilized. The focusing lens of the probe was directly formed onto the distal end of a fiber, which eliminated the need for additional optical components and optical alignment. A ferromagnetic iron bead was glued onto the middle of the fiber to enable actuation by magnetic force, which allowed easy fabrication and good practicality. The fiber piece having the built-in fiber lens was forced to oscillate in its resonant ...

   Read Full Article

   Comment

   Mentions: Seon Young Ryu Byeong Ha Lee Eun Jung Min

7. Thickness and index measurements of a transparent specimen by full-field optical coherence microscopy

   Explore SPIE Digital Library Mar 3 2009 Microscopy

   We present the method measuring the thickness and the refractive index of a transparent specimen at a same time based on full-field optical coherence tomography. As a sample a small drop of epoxy was placed on a flat plate and the high-resolution depth resolved en-face images of the epoxy drop were taken. With adopting the plate surface as a reference plane, the physical thickness and the refractive index distribution could be obtained. Owing to the full-field imaging capability, we could obtain the transverse distributions of the thickness and the refractive index without any transverse scanning. The measured thickness at the ...

   Read Full Article

   Comment

   Mentions: Seon Young Ryu Hae Young Choi Gwangju Institute of Science and Technology

8. Simultaneous measurements of optical coherence tomography and fluorescence spectroscopy based on double clad fiber

   Explore SPIE Digital Library Feb 20 2009

   We report an all-fiber system aided by double-clad fiber (DCF) and DCF devices for simultaneous measurements of optical coherence tomography (OCT) and fluorescence spectroscopy (FS). The DCF together with DCF coupler and single-body DCF lens helped in realizing a ultifunctional single-unit probe fo ... [Proc. SPIE 7171, 71710T (2009)] published Fri Feb 20, 2009.

   Read Full Article

   Comment

   Mentions: Seon Young Ryu Byeong Ha Lee Hae Young Choi

9. Single-body lensed fiber probe actuated by magnetic force for spectral domain optical coherence tomography

   Explore SPIE Digital Library Feb 20 2009 Probes

   We propose a fiber-based hand-held scanning probe suitable for the sample arm of spectral domain optical coherence tomography (SD-OCT). To achieve a compact and miniaturized probe, a single-body lensed-fiber, on which an iron-bead ferromagnetic material is loaded was fabricated and a solenoid actuat ... [Proc. SPIE 7168, 71682I (2009)] published Fri Feb 20, 2009.

   Read Full Article

   Comment

   Mentions: Seon Young Ryu Byeong Ha Lee Eun Jung Min

10. Combined system of optical coherence tomography and fluorescence spectroscopy based on double-cladding fiber

    Explore opticsinfobase.org Oct 10 2008

    We report the development of an all-fiber multimodal system, based on a double-cladding fiber (DCF) and related devices, suitable for simultaneous measurements of optical coherence tomography (OCT) and fluorescence spectroscopy (FS). The DCF together with a DCF coupler and a single-body DCF lens ... [Opt. Lett. 33, 2347-2349 (2008)]

    Read Full Article

    Comment

    Mentions: Seon Young Ryu Byeong Ha Lee Hae Young Choi

11. Lensed fiber probes designed as an alternative to bulk probes in optical coherence tomography

    Explore opticsinfobase.org Mar 26 2008 Probes

    We demonstrate a compact all-fiber sampling probe for an optical coherence tomography (OCT) system. By forming a focusing lens directly on the tip of an optical fiber, a compact sampling probe could be implemented. To simultaneously achieve a sufficiently long working distance and a good lateral ... [Appl. Opt. 47, 1510-1516 (2008)]

    Read Full Article

    Comment

    Mentions: Seon Young Ryu Byeong Ha Lee Hae Young Choi

12. All-fiber probe for optical coherence tomography

    Explore SPIE Digital Library Feb 18 2008 Gastroenterology , Probes

    Seon Young Ryu, Hae Young Choi, Jihoon Na et al. We propose an all-fiber probe for the sample arm of an optical coherence tomography (OCT) system. By forming a focusing lens directly on the tip of an optical fiber, a compact sample probe could be implemented. To achieve a long enough working distance and a high enough lateral resolution at the sam ... [Proc. SPIE Int. Soc. Opt. Eng. 6847, 68472L (2008)] published Mon Feb 18, 2008.

    Read Full Article

    Comment

    Mentions: Seon Young Ryu Byeong Ha Lee Hae Young Choi

13. Image restoration method based on Hilbert transform for full-field optical coherence tomography

    Explore opticsinfobase.org Jan 18 2008

    A full-field optical coherence tomography (FF-OCT) system utilizing a simple but novel image restoration method suitable for a high-speed system is demonstrated. An en-face image is retrieved from only two phase-shifted interference fringe images through using the mathematical Hilbert transform. ... [Appl. Opt. 47, 459-466 (2008)]

    Read Full Article

    Comment

    Mentions: Seon Young Ryu Byeong Ha Lee Gwangju Institute of Science and Technology

14. Single-body lensed photonic crystal fibers as side-viewing probes for optical imaging systems.

    Explore NCBI HomePage Dec 25 2007

    We report the fabrication and performance of a lensed photonic crystal fiber (PCF) designed as a compact but effective side-viewing optical imaging probe. The lensed-PCF probe was implemented in a single body without using any other fibers or additional optics. The beam expansion region and a focusing ball lens, necessary for a focuser, were simultaneously formed along a small piece of PCF by applying arc discharges. The side-viewing ability was provided by polishing the ball lens with a femtosecond laser to form a total internal reflection surface. The working distance and the transverse resolution of the fabricated single-body lensed-PCF were ...

    Read Full Article

    Comment

    Mentions: Seon Young Ryu Byeong Ha Lee Hae Young Choi

15. Single-body lensed photonic crystal fibers as side-viewing probes for optical imaging systems

    Explore opticsinfobase.org Dec 20 2007 Probes

    We report the fabrication and performance of a lensed photonic crystal fiber (PCF) designed as a compact but effective side-viewing optical imaging probe. The lensed-PCF probe was implemented in a single body without using any other fibers or additional optics. The beam expansion region and a ... [Opt. Lett. 33, 34-36 (2008)]

    Read Full Article

    Comment

    Mentions: Seon Young Ryu Byeong Ha Lee Hae Young Choi

Topics in the News

1. (15 articles) Gwangju Institute of Science and Technology
2. (14 articles) Seon Young Ryu
3. (14 articles) Byeong Ha Lee
4. (11 articles) Jihoon Na
5. (9 articles) Hae Young Choi
6. (6 articles) Woo June Choi
7. (3 articles) University of Washington
8. (2 articles) Eun Jung Min
9. (2 articles) Ruikang K. Wang
10. (1 articles) University of Ulsan
11. (1 articles) Myeong Jin Ju
12. (1 articles) Kwan Seob Park
13. (1 articles) Zhejiang University
14. (1 articles) Cleveland Clinic
15. (1 articles) UCSD
16. (1 articles) Sunil K. Srivastava
17. (1 articles) Justis P. Ehlers
18. (1 articles) William R. Freeman
19. (1 articles) Peng Li
20. (1 articles) Optovue

Popular Articles

• Ultrawideband photonic crystal fiber coupler for multiband optical imaging system  
• Single-body lensed fiber probe actuated by magnetic force for spectral domain optical coherence tomography  
• Feasibility of Full-field Optical Coherence Microscopy in Ultra-structural Imaging of Human Colon Tissues  
• All-fiber probe for optical coherence tomography  
• Image restoration method based on Hilbert transform for full-field optical coherence tomography  
• Single-body lensed photonic crystal fibers as side-viewing probes for optical imaging systems  
• Tomographic imaging of incipient dental-caries using optical coherence tomography and comparison with various modalities  
• Lensed fiber probes designed as an alternative to bulk probes in optical coherence tomography  
• Combined swept-source optical coherence tomography and fluorescence spectroscopy system  
• Thickness and index measurements of a transparent specimen by full-field optical coherence microscopy  

Picture Gallery