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Lensfree On-chip Tomographic Microscopy Employing Multi-angle Illumination and Pixel Super-resolution
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Three-dimensional super-resolved live cell imaging through polarized multi-angle TIRF.

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    This study enhances multi-angle total internal reflection fluorescence (MA-TIRF) microscopy for precise 3D cellular imaging. It achieves super-resolution, enabling high-resolution visualization of dynamic cellular processes like mitochondria fission and fusion.

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    Area of Science:

    • Biophysics
    • Cell Biology
    • Microscopy

    Background:

    • Accurate 3D nanoscale imaging of dynamic cellular structures is difficult.
    • Multi-angle total internal reflection fluorescence (MA-TIRF) offers nanoscale axial and subsecond temporal resolution.
    • Conventional MA-TIRF has limitations in lateral resolution and imaging dense cellular regions.

    Purpose of the Study:

    • To improve the lateral resolution of MA-TIRF for enhanced 3D cellular imaging.
    • To enable high-resolution visualization of dynamic cellular processes in live cells.
    • To develop an open-source recovery program for MA-TIRF.

    Main Methods:

    • Introduced polarization modulation into the MA-TIRF illumination.
    • Employed a sparsity and accelerated proximal algorithm for image reconstruction.
    • Achieved live cell imaging with a 2-second temporal resolution.

    Main Results:

    • Demonstrated significantly improved lateral super-resolution in MA-TIRF.
    • Enabled precise 3D structural recovery of nanoscale cellular components.
    • Successfully visualized high-resolution mitochondria fission and fusion processes.

    Conclusions:

    • The developed polarization-modulated MA-TIRF achieves superior lateral resolution and 3D imaging capabilities.
    • This technique provides unprecedented insights into dynamic cellular events at the nanoscale.
    • The release of the open-source recovery code facilitates broader adoption and advancement of MA-TIRF.