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Updated: Dec 9, 2025

Doppler Optical Coherence Tomography of Retinal Circulation
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Optical flow optical coherence tomography for determining accurate velocity fields.

Shuwen Wei, Jin U Kang

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    Summary
    This summary is machine-generated.

    Optical Flow Optical Coherence Tomography (OF-OCT) accurately quantifies micron-scale fluid flow velocities. This novel method overcomes limitations of existing techniques, enabling precise velocity field determination for biomedical and fluid dynamics research.

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    Area of Science:

    • Biophotonics and Biomedical Optics
    • Fluid Dynamics
    • Medical Imaging

    Background:

    • Accurate measurement of micron-scale fluid flow is crucial for biomedical research and clinical diagnosis.
    • Existing methods like Doppler OCT and speckle variance OCT have limitations in velocity component sensitivity and quantification.
    • Phase-based methods struggle with transverse velocity and phase instability, while amplitude-based methods primarily segment flow areas.

    Purpose of the Study:

    • To introduce Optical Flow OCT (OF-OCT) as a novel method for accurate quantification of micron-scale fluid velocity fields.
    • To validate the equivalence between optical flow and real velocity fields in OCT imaging.
    • To address system-specific challenges like Fourier-domain OCT (FDOCT) sensitivity fall-off.

    Main Methods:

    • Developed OF-OCT by adapting optical flow principles to OCT imaging.
    • Incorporated a modified optical flow continuity constraint accounting for FDOCT sensitivity fall-off.
    • Utilized spatial-temporal smoothness constraints for a well-posed optical flow problem and noise reduction.
    • Implemented an iterative GPU-accelerated solution for real-time processing.

    Main Results:

    • Validated the accuracy of OF-OCT in determining velocity fields using phantom flow experiments.
    • Demonstrated the ability of OF-OCT to detect flow turbulence.
    • Showcased the reconstruction of flow trajectories based on the determined velocity fields.
    • OF-OCT proved accurate and applicable to fluid dynamics research.

    Conclusions:

    • OF-OCT provides an accurate method for quantifying micron-scale fluid velocity fields.
    • The technique overcomes limitations of traditional phase- and amplitude-based OCT methods.
    • OF-OCT is a valuable tool for advancing research in fluid dynamics and biomedical applications.