1. Articles from Ju Wan Kim

    1-6 of 6
    1. Angiographic Imaging of an In Vivo Mouse Brain as a Guiding Star for Automatic Digital Refocusing in OCT

      Angiographic Imaging of an In Vivo Mouse Brain as a Guiding Star for Automatic Digital Refocusing in OCT

      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. However, for in vivo OCT imaging, evaluation of the image focus is not easy, owing to the cloudy structure of the brain. In the proposed method, the blood flow signals ...

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    2. Real-time stroboscopic full-field optical coherence tomography based on graphics processing unit

      Real-time stroboscopic full-field optical coherence tomography based on graphics processing unit

      We present the real-time stroboscopic full-field optical coherence tomography (FF-OCT) system that is based on graphics processing unit (GPU). The basic configuration of the proposed FF-OCT system was the Linnik interferometer. While scanning of a reference mirror in the axial direction, a series of the transverse sectional image was captured with a 2-dimensional CCD camera. To get a depth-resolved 3-D image, the light source of OCT was turned on and off like a stroboscope at the Doppler frequency of the OCT system. The CCD camera used in experiment operated at a rate of 200 frames per second, but the Doppler ...

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    3. Refractive index measurements of multiple layers using numerical refocusing in FF-OCT

      Refractive index measurements of multiple layers using numerical refocusing in FF-OCT

      We propose and demonstrate the novel method of refractive index (RI) measurement for each layer of multilayered samples, which is based on numerical refocusing in full field optical coherence tomography (FF-OCT). The en-face FF-OCT image on an inner layer boundary of a multilayered sample is unintentionally blurred or defocused due to the RI of the sample itself, but can be numerically refocused. The refocusing is performed by numerically shifting the image sensor plane of the system, in general. However, by calculating the corresponding sample shift and then compared it with the actual sample shifting distance, we could extract the average ...

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    4. The refractive index measurement technique based on the defocus correction method in full-field optical coherence tomography

      The refractive index measurement technique based on the defocus correction method in full-field optical coherence tomography

      We propose and demonstrate a novel refractive index (RI) measurement by using the numerical-sample-motion based the defocus correction method in full field optical coherence tomography (FF-OCT). Overcoming the general problem in FFOCT that is the position of the focal plane is separated from the position of the image plane when imaging a deep region inside a sample, we measure the separation distance from the position of the focal plane to the position of the image plane. The RI is determined from the separation distance that is obtained by the numerically adjusted distance of a sample position. With the proposed method ...

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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. Correction of defocused images in full-field optical coherence tomography using digital holography

      Correction of defocused images in full-field optical coherence tomography using digital holography

      We propose the digital holographic technique that can mathematically reconstruct the distorted two dimensional en-face images obtained with full-field optical coherence tomography (FF-OCT). As a powerful biomedical imaging modality, FF-OCT provides inner microstructure images of a biological sample noninvasively but with a submicron depth resolution. The main advantage of the FF-OCT over other OCT techniques is that, it requires only depth scanning (C-scan) without any transverse mechanical scanning (B-scan). In a FF-OCT system based on a Michelson interferometer, not only the length of the reference arm should be matched with the length to the imaging plane in the sample arms ...

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    1-6 of 6
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  2. Topics in the News

    1. (6 articles) Gwangju Institute of Science and Technology
    2. (6 articles) Ju Wan Kim
    3. (6 articles) Byeong Ha Lee
    4. (4 articles) Gihyeon Min
    5. (3 articles) Woo June Choi
    6. (2 articles) Kwan Seob Park
    7. (1 articles) University of Washington
    8. (1 articles) Jae Hwi Lee
    9. (1 articles) Jonghyun Eom
    10. (1 articles) Tae Joong Eom
    11. (1 articles) Sun Yat-Sen University
    12. (1 articles) National Institutes of Health
    13. (1 articles) University of Illinois at Urbana-Champaign
    14. (1 articles) Tianjin University
    15. (1 articles) Zhejiang University
    16. (1 articles) New York Eye and Ear Infirmary
    17. (1 articles) Eric J. Chaney
    18. (1 articles) Jun Zhang
    19. (1 articles) Robert Ritch
    20. (1 articles) Stephen A. Boppart
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    Feature Of The Week 3/27/11: Feasibility of Full-Field Optical Coherence Tomography for Detection of Counterfeit Paper Money Correction of defocused images in full-field optical coherence tomography using digital holography The refractive index measurement technique based on the defocus correction method in full-field optical coherence tomography Refractive index measurements of multiple layers using numerical refocusing in FF-OCT Real-time stroboscopic full-field optical coherence tomography based on graphics processing unit Angiographic Imaging of an In Vivo Mouse Brain as a Guiding Star for Automatic Digital Refocusing in OCT Optical coherence tomography angiography in glaucoma Handheld optical coherence tomography for clinical assessment of dental plaque and gingiva Characterisation of macular superficial vessel density alteration in preclinical ethambutol-induced optic neuropathy using optical coherence tomography angiography Three-dimensional spatial reconstruction of coronary arteries based on fusion of intravascular optical coherence tomography and coronary angiography Dynamic-range compression and contrast enhancement in swept-source optical coherence tomography systems with a frequency gain compensation amplifier Healing and early stent coverage after ultrathin strut biodegradable polymer-coated sirolimus-eluting stent implantation: SiBi optical coherence tomography study