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Super-Resolution Second-Harmonic Generation Imaging with Multifocal Structured Illumination Microscopy.

Chenshuang Zhang1, Fangrui Lin1, Yong Zhang1

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

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|August 29, 2023
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Summary
This summary is machine-generated.

A new super-resolution imaging technique, multifocal structured illumination microscopy-SHG (MSIM-SHG), overcomes diffraction limits for biological imaging. This method enhances visualization of cellular structures and collagen fibers in tissues.

Keywords:
multifocal structured illumination microscopysecond-harmonic generationsuper-resolution imaging

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Area of Science:

  • Biomedical Imaging
  • Optical Microscopy
  • Biophysics

Background:

  • Second-harmonic generation (SHG) imaging offers noninvasive visualization of physiological structures without exogenous labels.
  • Traditional SHG imaging resolution is fundamentally limited by optical diffraction.
  • Overcoming diffraction limits is crucial for detailed biological and material science investigations.

Purpose of the Study:

  • To develop a super-resolution imaging technique by combining SHG with multifocal structured illumination microscopy (MSIM).
  • To demonstrate the capability of the novel MSIM-SHG method for high-resolution imaging of biological tissues and cells.
  • To assess the utility of MSIM-SHG for quantifying collagen fiber alignment in various tissues.

Main Methods:

  • Development of multifocal structured illumination microscopy-SHG (MSIM-SHG).
  • Imaging of zinc oxide (ZnO) particles to determine imaging resolution.
  • Application of MSIM-SHG to quantify collagen fiber alignment in ovary, muscle, heart, kidney, and cartilage tissues.

Main Results:

  • MSIM-SHG achieved a lateral full width at half-maximum (fwhm) of 147 ± 13 nm and an axial fwhm of 493 ± 47 nm.
  • The technique successfully quantified collagen fiber alignment in multiple biological tissue types.
  • Demonstrated feasibility for identifying specific collagen characteristics in diverse tissues.

Conclusions:

  • MSIM-SHG successfully breaks the diffraction limit for SHG imaging, enabling super-resolution.
  • The method provides high-resolution imaging of biological structures and is effective for collagen analysis.
  • MSIM-SHG presents significant potential as a tool for advanced clinical diagnosis and fundamental biological research.