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Related Concept Videos

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Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.
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Three-dimensional resolution enhancement of two-photon microscopy by combining point spread function engineering and

Jiangfeng Huang, Zhou Zhou, Xiaohua Lv

    Optics Letters
    |June 1, 2026
    PubMed
    Summary

    This study introduces a novel method to improve the 3D resolution of two-photon microscopy (TPM) by combining point spread function (PSF) engineering with deconvolution. This technique enhances imaging of fine biological structures, overcoming diffraction limits.

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    Area of Science:

    • Biomedical Imaging
    • Optical Microscopy
    • Biophysics

    Background:

    • Two-photon microscopy (TPM) offers deep tissue imaging but suffers from limited 3D spatial resolution due to diffraction.
    • Axial resolution is a significant bottleneck in TPM, hindering the visualization of intricate biological structures.

    Purpose of the Study:

    • To develop and demonstrate a 3D resolution enhancement strategy for TPM.
    • To improve the axial and lateral resolution beyond conventional TPM capabilities.

    Main Methods:

    • Point spread function (PSF) engineering by modulating the objective pupil to enhance axial high-frequency components.
    • Acquisition of complementary volumetric datasets using conventional Gaussian and modulated illumination.
    • Joint reconstruction of datasets using a Hessian-regularized deconvolution framework.

    Main Results:

    • Achieved 1.56× lateral and 1.67× axial resolution improvements over conventional TPM using 200-nm fluorescent beads.
    • Demonstrated an additional 1.26× axial improvement with PSF engineering and deconvolution compared to deconvolution with Gaussian-PSF alone.
    • Successfully visualized fine 3D structures in HeLa cells and restored resolution enhancement in brain slices with aberration correction.

    Conclusions:

    • PSF engineering combined with multi-image deconvolution is an effective strategy for enhancing 3D resolution in TPM.
    • The developed method improves contrast and visualization of fine structures in biological tissues.
    • Aberration correction is crucial for maintaining the performance of this resolution enhancement technique.