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Label-free quantitative 3D tomographic imaging for partially coherent light microscopy.

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    Partially coherent optical diffraction tomography (PC-ODT) enables 3D refractive index reconstruction using standard microscopes. This technique offers an affordable alternative for quantitative imaging of biological and material samples.

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    Area of Science:

    • Biophysics
    • Optical Imaging
    • Materials Science

    Background:

    • Partially coherent light microscopy offers advantages like enhanced resolution and optical sectioning.
    • Quantitative 3D imaging, specifically refractive index (RI) reconstruction, is valuable for analyzing complex samples.
    • Existing coherent optical diffraction tomography (ODT) methods often require specialized, expensive equipment.

    Purpose of the Study:

    • To present a partially coherent optical diffraction tomography (PC-ODT) technique for 3D RI reconstruction.
    • To demonstrate the implementation of PC-ODT in commercially available bright-field microscopes.
    • To establish PC-ODT as an accessible and effective quantitative imaging method.

    Main Methods:

    • Utilized partially coherent light microscopy principles for 3D RI reconstruction.
    • Integrated a high-speed focus tunable lens for optical refocusing, ensuring compatibility with commercial microscopes.
    • Employed high numerical aperture objective and condenser lenses to optimize image acquisition.

    Main Results:

    • Successfully achieved fast and accurate 3D RI reconstruction of weak objects.
    • Demonstrated the technique's efficacy on diverse samples, including diatom cells, polystyrene microspheres, and blood cells.
    • Validated the quantitative information obtained from the reconstructed RI maps.

    Conclusions:

    • PC-ODT provides crucial benefits for 3D quantitative imaging, including improved spatial resolution and optical sectioning.
    • The developed PC-ODT technique is easily implementable in standard bright-field microscopes.
    • PC-ODT serves as an efficient and affordable alternative to coherent ODT for detailed sample analysis.