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Related Concept Videos

Super-resolution Fluorescence Microscopy01:37

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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Multifocal Pixel/Photon-Reassignment FLIM (MPPR-FLIM): A Super-Resolution Analytical Tool for Characterizing

Yongtu Liao1, Danying Lin1, Duo Chen1

  • 1Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.

Analytical Chemistry
|June 15, 2026
PubMed
Summary
This summary is machine-generated.

A new super-resolution technique, multifocal pixel/photon-reassignment FLIM (MPPR-FLIM), enhances spatial resolution for cellular imaging. This method offers a practical tool for biomedical research without custom optics.

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Area of Science:

  • Biomedical imaging
  • Microscopy
  • Cell biology

Background:

  • Conventional fluorescence lifetime imaging microscopy (FLIM) has limited spatial resolution, hindering subcellular analysis.
  • Existing super-resolution FLIM methods often require specialized, non-standard optical components.

Purpose of the Study:

  • To develop a practical super-resolution FLIM technique with enhanced spatial resolution.
  • To enable detailed analysis of subcellular microenvironmental heterogeneity.

Main Methods:

  • Introduced multifocal pixel/photon-reassignment FLIM (MPPR-FLIM).
  • Utilized standard wide-field and single-point detectors with time-correlated single-photon counting (TCSPC).
  • Implemented a synchronization strategy and post-acquisition data remapping (pixel and photon reassignment).

Main Results:

  • Achieved approximately a 2.1-fold improvement in spatial resolution compared to conventional TCSPC-FLIM.
  • Successfully imaged lysosomes in live cells, revealing subcellular compartment-specific lifetime variations.
  • Demonstrated MPPR-FLIM's potential for analyzing subcellular heterogeneity.

Conclusions:

  • MPPR-FLIM provides a practical, accessible super-resolution analytical tool for biomedical research.
  • The technique facilitates investigation into the relationship between subcellular lifetime heterogeneity and cellular functions.