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Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
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Updated: Feb 17, 2026

Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography
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Cross-correlation photothermal optical coherence tomography with high effective resolution.

Peijun Tang, Shaojie Liu, Junbo Chen

    Optics Letters
    |December 8, 2017
    PubMed
    Summary

    We developed a novel cross-correlation photothermal optical coherence tomography (CC-PTOCT) system. This advanced imaging technique achieves high resolution for visualizing biological structures like blood capillaries in vivo.

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    Area of Science:

    • Biomedical Optics
    • Medical Imaging
    • Photothermal Imaging

    Background:

    • Photothermal optical coherence tomography (PTOCT) offers functional imaging capabilities.
    • Existing PTOCT methods face challenges with resolution and noise, limiting their diagnostic potential.

    Purpose of the Study:

    • To develop and validate a cross-correlation photothermal optical coherence tomography (CC-PTOCT) system.
    • To enhance lateral and axial resolution and improve image contrast in PTOCT.

    Main Methods:

    • Integration of a phase-sensitive optical coherence tomography (OCT) system with a modulated pumping laser and a digital cross-correlator.
    • Utilizing spatial phase differentiation to minimize phase accumulation and noise.
    • Employing a cross-correlator to extract photothermal signals and suppress background noise.

    Main Results:

    • Successful acquisition of high-resolution in vivo photothermal images of mouse ear blood capillaries.
    • Demonstrated significant enhancement in effective transverse resolution, depth resolution, and image contrast.
    • Validated the efficacy of combining cross-correlation with spatial phase differentiation for improved imaging.

    Conclusions:

    • The developed CC-PTOCT system provides superior lateral and axial resolution for photothermal imaging.
    • This advancement supports the development of accurate 3D functional imaging for biomedical applications.
    • CC-PTOCT shows promise for enhanced visualization of microvasculature and other subsurface structures.