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    Area of Science:

    • Biomedical Optics
    • Optical Metrology
    • Image Processing

    Background:

    • Phase-sensitive optical coherence tomography (PhS-OCT) faces challenges with phase decorrelation and limited lateral displacement measurement.
    • These limitations hinder precise analysis of subsurface deformation and structural changes.

    Purpose of the Study:

    • To introduce a novel DIC-assisted PhS-OCT (DIC-PhS-OCT) method.
    • To address phase decorrelation and enable lateral displacement measurement in PhS-OCT.

    Main Methods:

    • Employed digital image correlation (DIC) to track displacements from amplitude spectra.
    • Utilized tracked displacements to correct phase spectra for supra-pixel offsets.
    • Integrated DIC with PhS-OCT for enhanced displacement analysis.

    Main Results:

    • Successfully mitigated phase decorrelation caused by axial and lateral displacements.
    • Enabled acquisition of sub-pixel lateral displacement measurements.
    • Maintained the ultrahigh sensitivity characteristic of conventional PhS-OCT.

    Conclusions:

    • DIC-PhS-OCT effectively overcomes key limitations of traditional PhS-OCT.
    • The method enhances the accuracy and scope of displacement measurements in optical coherence tomography.
    • This advancement holds potential for improved biomedical imaging and material science applications.