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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.
Confocal Fluorescence Microscopy01:16

Confocal Fluorescence Microscopy

Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...

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Biomolecular Imaging of Cellular Uptake of Nanoparticles using Multimodal Nonlinear Optical Microscopy
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Use of nonlinear upconverting nanoparticles provides increased spatial resolution in fluorescence diffuse imaging.

Pontus Svenmarker1, Can T Xu, Stefan Andersson-Engels

  • 1Department of Physics, Lund University, P.O. Box 118, S-221 00 Lund, Sweden. pontus.svenmarker@fysik.lth.se

Optics Letters
|August 19, 2010
PubMed
Summary

This study enhances fluorescence diffuse imaging (FDI) resolution using nonlinear fluorophores. Nonlinear upconverting nanoparticles improved spatial resolution by 1.3x experimentally, offering a promising advancement for FDI.

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Area of Science:

  • Biomedical Optics
  • Medical Imaging
  • Nanotechnology

Background:

  • Fluorescence diffuse imaging (FDI) is a valuable tool but is limited by poor spatial resolution.
  • Improving spatial resolution in FDI is crucial for enhanced diagnostic capabilities and deeper tissue penetration.

Purpose of the Study:

  • To investigate a scanning imaging approach for enhancing the spatial resolution of fluorescence diffuse imaging.
  • To evaluate the efficacy of nonlinear fluorophores, specifically upconverting nanoparticles, in improving FDI resolution compared to linear fluorophores.

Main Methods:

  • A comparative experimental setup was designed to assess resolution differences between linear fluorophores and nonlinear upconverting nanoparticles (NaYF(4):Yb(3+)/Tm(3+)).
  • Imaging was performed using a scanning approach within a controlled tissue phantom environment.
  • Computational simulations were conducted to predict the theoretical maximum resolution improvement.

Main Results:

  • Experimental results demonstrated a resolution improvement factor of 1.3 when using nonlinear upconverting nanoparticles compared to linear fluorophores.
  • Simulations indicated a potential maximum resolution improvement factor of up to 1.45.
  • The scanning imaging approach with nonlinear fluorophores significantly enhanced spatial resolution in FDI.

Conclusions:

  • The use of nonlinear fluorophores, particularly upconverting nanoparticles, is a highly promising strategy for overcoming the spatial resolution limitations of fluorescence diffuse imaging.
  • This advancement holds potential for improving the clarity and detail in biomedical optical imaging applications.