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Structured illumination phase and fluorescence microscopy for bioimaging.

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    Area of Science:

    • Biomedical optics
    • Microscopy
    • Cell biology

    Background:

    • Existing microscopy techniques often provide either structural or functional information, limiting comprehensive analysis of biological samples.
    • Quantitative phase microscopy offers label-free, high-contrast imaging of cellular structures.
    • Fluorescence microscopy provides specific functional information but typically requires labeling and can be limited in resolution.

    Purpose of the Study:

    • To develop and demonstrate a dual-modality microscopic imaging approach combining quantitative phase microscopy and structured illumination microscopy.
    • To provide simultaneous structural and functional information from the same biological sample.
    • To enhance insights into cell physiology and subcellular structures through advanced imaging.

    Main Methods:

    • Implementation of structured illumination digital holographic microscopy (SI-DHM) in the transmission path for label-free, quantitative phase imaging.
    • Integration of structured illumination microscopy (SIM) in the reflection path for super-resolution fluorescence imaging of labeled structures.
    • Experimental demonstration on rice leaves (SI-DHM) and mouse kidney sections (SIM), followed by dual-modality imaging of biological samples.

    Main Results:

    • SI-DHM successfully provided high-contrast, quantitative phase images of sample internal structures.
    • SIM achieved super-resolution imaging of specific functional components within labeled samples.
    • Dual-modality imaging enabled concurrent visualization of overall cell morphology (DHM) and specific subcellular functional structures (SIM).

    Conclusions:

    • The proposed dual-modality imaging technique effectively combines the strengths of quantitative phase microscopy and structured illumination microscopy.
    • This approach provides comprehensive structural and functional insights into biological samples.
    • The technique holds significant potential for advancing biomedical studies, particularly in visualizing and quantifying subcellular structures and cell physiology.