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Related Experiment Video

Updated: May 20, 2025

Retinal Vascular Reactivity as Assessed by Optical Coherence Tomography Angiography
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Retinal Vascular Reactivity as Assessed by Optical Coherence Tomography Angiography

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Phase-Locked Time-Stretch Optical Coherence Tomography for Contrast-Enhanced Retinal Microangiography.

Gyeong Hun Kim, Seongjin Bak, Hyung-Hoi Kim

    IEEE Transactions on Medical Imaging
    |March 26, 2025
    PubMed
    Summary
    This summary is machine-generated.

    A new phase-locked time-stretch optical coherence tomography angiography system offers improved retinal microvasculature imaging. This advanced technology enhances visualization of deep retinal layers for better disease diagnosis.

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    Related Experiment Videos

    Last Updated: May 20, 2025

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    Doppler Optical Coherence Tomography of Retinal Circulation
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    Doppler Optical Coherence Tomography of Retinal Circulation

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    Area of Science:

    • Ophthalmology
    • Biomedical Engineering
    • Medical Imaging

    Background:

    • Optical coherence tomography angiography (OCTA) revolutionized retinal vascular imaging with non-invasive, high-resolution visualization.
    • Challenges persist in balancing field of view, resolution, and contrast for deep retinal microvasculature imaging.

    Purpose of the Study:

    • To develop a novel phase-locked time-stretch OCT angiography system to overcome current imaging limitations.
    • To enhance visualization of superficial and deep retinal capillary plexuses and the choriocapillaris.

    Main Methods:

    • A 5-MHz A-line rate system with sub-nm phase sensitivity was engineered.
    • A dual chirped fiber Bragg grating architecture provided an extended coherence length (~10 mm) and 102-nm bandwidth.
    • A time-stretch analog-to-digital converter enabled 2-mm imaging depth with high spatial resolution.

    Main Results:

    • The system achieved high-contrast, depth-encoded mapping of retinal microvasculature.
    • Demonstrated enhanced resolution, improved contrast, and faster imaging speeds compared to state-of-the-art systems.
    • Successfully visualized superficial and deep capillary plexuses and the choriocapillaris.

    Conclusions:

    • The developed phase-locked time-stretch OCT angiography system significantly advances retinal microvasculature imaging.
    • Offers potential for improved diagnosis and monitoring of retinal diseases (e.g., AMD, diabetic retinopathy) and systemic conditions (e.g., Alzheimer's).