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Dispersion compensation in Fourier domain optical coherence tomography.

Tarek A Al-Saeed, Mohamed Y Shalaby, Diaa A Khalil

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    This study introduces a numerical method to fix dispersion errors in Fourier domain optical coherence tomography (FD-OCT). The technique significantly improves depth measurement accuracy and resolution, crucial for precise imaging applications.

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    Area of Science:

    • Biomedical Optics
    • Metrology
    • Signal Processing

    Background:

    • Fourier domain optical coherence tomography (FD-OCT) is a powerful imaging technique.
    • Dispersion effects in optical media can introduce significant errors in FD-OCT measurements.
    • These errors manifest as inaccuracies in depth measurements and reduced image resolution.

    Purpose of the Study:

    • To develop and validate a numerical technique for compensating dispersion-induced errors in FD-OCT.
    • To quantitatively assess the improvement in depth measurement accuracy and resolution using the proposed method.

    Main Methods:

    • A novel numerical algorithm was developed to correct for dispersion effects.
    • The technique was applied to FD-OCT data from various samples.
    • Performance was evaluated by comparing measurements before and after correction.

    Main Results:

    • The proposed technique effectively reduces errors in thickness measurements from approximately 5% to less than 0.1%.
    • Resolution is significantly improved, from about 50 μm down to less than 10 μm.
    • The accuracy of the correction depends on sample length and the magnitude of dispersion.

    Conclusions:

    • The developed numerical technique offers a robust solution for mitigating dispersion artifacts in FD-OCT.
    • This advancement enables more precise and reliable depth and dimensional measurements using FD-OCT.
    • The improved resolution and accuracy have broad implications for various applications of FD-OCT.