1. Korea Advanced Institute of Science and Technology

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    1. Mentioned In 21 Articles

    2. Spectral binning for mitigation of polarization mode dispersion artifacts in catheter-based optical frequency domain imaging

      Spectral binning for mitigation of polarization mode dispersion artifacts in catheter-based optical frequency domain imaging

      Polarization mode dispersion (PMD) has been recognized as a significant barrier to sensitive and reproducible birefringence measurements with fiber-based, polarization-sensitive optical coherence tomography systems. Here, we present a signal processing strategy that reconstructs the local retardation robustly in the presence of system PMD. The algorithm uses a spectral binning approach to limit the detrimental impact of system PMD and benefits from the final averaging of the PMD-corrected retardation vectors of the spectral bins. The algorithm was validated with numerical simulations and experimental measurements of a rubber phantom. When applied to the imaging of human cadaveric coronary arteries, the algorithm was ...

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    3. High-speed automatic segmentation of intravascular stent struts in optical coherence tomography images

      High-speed automatic segmentation of intravascular stent struts in optical coherence tomography images

      Recently, Optical Coherence Tomography (OCT) has become one of the preferred clinical techniques for intracoronary diagnostic imaging. Thanks to its high resolution imaging capability, the OCT technique allows to identify microscopic features associated with various types of coronary plaque and to track of stent position, malaposition and neo-intimal tissue growth after stent implantation. Accurate visualization of stent struts can help to examine the status of implanted stents potentially leading to proper treatment of the coronary artery disease. However, unfortunately, current stent identification involves time-consuming segmentation algorithms sometimes requiring labor-intensive manual analysis process. To resolve the problem, we propose a high-speed ...

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    4. Feature Of The Week 3/3/13: Complex wavefront shaping for optimal depth-selective focusing in optical coherence tomography

      Feature Of The Week 3/3/13: Complex wavefront shaping for optimal depth-selective focusing in optical coherence tomography
      ...n vivo applications in the near future. For more information see recent Article . Courtesy YongKeun Park from Korea Advanced Institute of Science and Technology . We present that a novel wavefront shaping approach improv...
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    5. Polarization sensitive full-field optical coherence tomography based on bi-stable polarizaton switch

      Polarization sensitive full-field optical coherence tomography based on bi-stable polarizaton switch

      We present polarization-sensitive full-field optical coherence tomography (PS-FF-OCT), which is based on a bi-stable polarization switch (BSPS) device. The proposed PS-FF-OCT is a Linnik type interferometer, and allows getting both the birefringence-induced phase retardation and the intensity images of specimens with high resolutions using a pair of micro objectives and a BSPS device. Two orthogonal polarization states are formed with a regular time interval by the BSPS device that changes the polarization direction of light in a short time by switching its optic axes. Therefore, both the horizontally polarized light signal and the vertically polarized light signal from the sample ...

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    6. Complex wavefront shaping for optimal depth-selective focusing in optical coherence tomography

      Complex wavefront shaping for optimal depth-selective focusing in optical coherence tomography

      We report on an approach to exploit multiple light scattering by shaping the incident wavefront in optical coherence tomography (OCT). Most of the reflected signal from biological tissue consists of multiply scattered light, which is regarded as noise in OCT. A digital mirror device (DMD) is utilized to shape the incident wavefront such that the maximal energy is focused at a specific depth in a highly scattering sample using a coherence-gated reflectance signal as feedback. The proof-of-concept experiment demonstrates that this approach enhances depth-selective focusing in the presence of optical inhomogeneity, and thus extends the penetration depth in spectral domain-OCT ...

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    7. Feature Of The Week 8/19/12: Recent Results on Miniature OCT MEMS Endoscopes from Korea Advanced Institute of Science and Technology

      Feature Of The Week 8/19/12: Recent Results on Miniature OCT MEMS Endoscopes from Korea Advanced Institute of Science and Technology
      ...biopsy.   Below is a summary of some exciting work by the Korea Advanced Institute of Science and Technology (KAIST).This work reports a fully packaged MEMS endoscopic catheter for forward imaging optical coherence tomog...
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    8. Triggered optical coherence tomography for capturing rapid periodic motion

      Triggered optical coherence tomography for capturing rapid periodic motion
      Quantitative cross-sectional imaging of vocal folds during phonation is potentially useful for diagnosis and treatments of laryngeal disorders. Optical coherence tomography (OCT) is a powerful technique, but its relatively low frame rates makes it challenging to visualize rapidly vibrating tissues. Here, we demonstrate a novel method based on triggered laser scanning to capture 4-dimensional (4D) images of samples in motu at audio frequencies over 100 Hz. As proof-of-concept experiments, we applied this technique to imaging the oscillations of biopolymer gels on acoustic vibrators and aerodynamically driven vibrations of the vocal fold in an ex vivo calf larynx model. Our results ...
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  2. About Korea Advanced Institute of Science and Technology

    Korea Advanced Institute of Science and Technology

    Korea Advanced Institute of Science and Technology (KAIST) was established in 1971 as the nation’s first graduate school specializing in science and engineering education and research. The school’s founding was a catalyst for Korea’s rapid rise from a producer of light industry goods to a world leader in high-technology industries.