1. Articles from Jonghyun Eom

    1-6 of 6
    1. Wide field of view optical coherence tomography for structural and functional diagnoses in dentistry

      Wide field of view optical coherence tomography for structural and functional diagnoses in dentistry

      We report herein the fabrication and performance response of a three-dimensional (3-D) intraoral scan probe based on optical coherence tomography (OCT) that enables 3-D structural and functional diagnoses of the human teeth. The OCT system was configured using a swept-source OCT (SS-OCT) with a center wavelength of 1310 nm. The scan probe was built using an MEMS mirror and an optical collimator. The implemented SS-OCT equipped with the MEMS-based scan probe yielded an axial resolution of 10  μm and a scan range of 8  ×  8  mm 2 . Two-dimensional (2-D) cross-sectional images of the teeth were acquired by the scan probe ...

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      Mentions: Jonghyun Eom
    2. An All-Fiber-Optic Combined System of Noncontact Photoacoustic Tomography and Optical Coherence Tomography

      An All-Fiber-Optic Combined System of Noncontact Photoacoustic Tomography and Optical Coherence Tomography

      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 was homemade with a lensed single-mode fiber (SMF) and a large-core multimode fiber (MMF). The compact and robust common probe is capable of obtaining both the PA and the OCT ...

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    3. An All-Fiber-Optic Combined System of Noncontact Photoacoustic Tomography and Optical Coherence Tomography

      An All-Fiber-Optic Combined System of Noncontact Photoacoustic Tomography and Optical Coherence Tomography

      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 was homemade with a lensed single-mode fiber (SMF) and a large-core multimode fiber (MMF). The compact and robust common probe is capable of obtaining both the PA and the OCT ...

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    4. All optical fiber combined-imaging system of photoacoustic and optical coherence tomography

      All optical fiber combined-imaging system of photoacoustic and optical coherence tomography

      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 a large core multimode optical fiber. The fiber-based OCT operating at a center wavelength of 1310 nm allowed is combined with the fiber-based PAT system by sharing the same optical ...

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    5. Feature Of The Week 3/27/11: Feasibility of Full-Field Optical Coherence Tomography for Detection of Counterfeit Paper Money

      Feature Of The Week 3/27/11: Feasibility of Full-Field Optical Coherence Tomography for Detection of Counterfeit Paper Money
      Feature Of The Week 3/27/11: This week’s featured work is from Gwangju Institute of Science and Technology (GIST) where researchers reported on an exciting application of full-field optical coherence tomography (FF-OCT) for identifying counterfeit bank notes. Recent application of the FF-OCT has been expanded to medical biology, clinical pathology, cell biology, material industry and even biometric-based forensic science. In this study, they have demonstrated new approach of the OCT technique for counterfeit science. Money counterfeiting is mostly prevalently forged item worldwide with advance of printing technology and computer system, leading to deep concerns for the risk of ...
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    6. Stroboscopic wide-field optical coherence gated imaging

      We present an advanced three-dimensional tomographic imaging system using the optical coherence gating based on stroboscopic illumination. The proposed system is based on a wide-field optical coherence tomography (WF-OCT) that is capable of en-face tomographic imaging through whole-field illumination and parallel detection technique. The scheme enables achievement of a three-dimensional volumetric image in real time only with a single axial continuous scanning. The axial scanning of the OCT system generates interferometric signal with a beat (or Doppler) frequency. The time-varying interfergams are usually detected in series with a CCD camera for the WF-OCT case. However, because the camera response is ...
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    1-6 of 6
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  2. Topics in the News

    1. (6 articles) Jonghyun Eom
    2. (5 articles) Gwangju Institute of Science and Technology
    3. (5 articles) Byeong Ha Lee
    4. (2 articles) Jun Geun Shin
    5. (2 articles) Woo June Choi
    6. (1 articles) Jihoon Na
    7. (1 articles) Gihyeon Min
    8. (1 articles) Ju Wan Kim
    9. (1 articles) Samsung
    10. (1 articles) Johns Hopkins University
    11. (1 articles) National Institutes of Health
    12. (1 articles) Sungkyunkwan University
    13. (1 articles) University of São Paulo
    14. (1 articles) Massachusetts Institute of Technology
    15. (1 articles) L V Prasad Eye Institute
    16. (1 articles) Gong Je Seong
    17. (1 articles) Chan Yun Kim
    18. (1 articles) James G. Fujimoto
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    Feature Of The Week 3/27/11: Feasibility of Full-Field Optical Coherence Tomography for Detection of Counterfeit Paper Money All optical fiber combined-imaging system of photoacoustic and optical coherence tomography An All-Fiber-Optic Combined System of Noncontact Photoacoustic Tomography and Optical Coherence Tomography An All-Fiber-Optic Combined System of Noncontact Photoacoustic Tomography and Optical Coherence Tomography Wide field of view optical coherence tomography for structural and functional diagnoses in dentistry Factors Associated with Changes in Retinal Layers Following Acute Optic Neuritis: A Longitudinal Study Using Optical Coherence Tomography Relationship between N95 Amplitude of Pattern Electroretinogram and Optical Coherence Tomography Angiography in Open-Angle Glaucoma Historic Effort to 'End Blindness" Marks a Major Milestone with Leading Scientist Recognized for Pioneering Work at VIP Ceremony Featuring Tribute to Ruth Bader Ginsburg Healing and early stent coverage after ultrathin strut biodegradable polymer‐coated sirolimus‐eluting stent implantation: SiBi optical coherence tomography study Influences of hypomagnesemia on optic nerve and retinal vascular structure determined using optical coherence tomography angiography Repeatability and agreement of total corneal and sublayer pachymetry with 2 different algorithms of Fourier-domain optical coherence tomography in myopic and postphotorefractive keratectomy eyes Vessel Density around Foveal Avascular Zone as a Potential Imaging Biomarker for Detecting Preclinical Diabetic Retinopathy: An Optical Coherence Tomography Angiography Study