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Extremely sensitive dual imaging system in solid phantoms.

Eran A Barnoy1, Dror Fixler1, Rachela Popovtzer1

  • 1Faculty of Engineering and the Institute of Nanotechnology and Advanced Materials, Bar Ilan University, Ramat Gan 5290002, Israel.

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Summary
This summary is machine-generated.

This study combines fluorescent lifetime imaging microscopy (FLIM) and diffusion reflection (DR) for enhanced biomedical imaging. Gold nanoparticles conjugated with dyes show metal-enhanced fluorescence (MEF), improving sensitivity for molecular imaging.

Keywords:
Gold nanoparticlesbiomolecular imagingdiffusion reflectionfluorescence lifetime imaginggold nanorodsmetal enhanced fluorescencenoninvasive detectiontissue-imitating phantoms

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Area of Science:

  • Biomedical Imaging
  • Nanotechnology
  • Optical Physics

Background:

  • Fluorescent lifetime imaging microscopy (FLIM) and diffusion reflection (DR) are advanced medical imaging techniques.
  • Gold nanoparticles (GNPs) offer unique optical properties for imaging applications.
  • Combining imaging modalities can enhance sensitivity and information retrieval.

Purpose of the Study:

  • To evaluate the synergistic potential of FLIM and DR for biomedical imaging.
  • To investigate the optical properties of different gold nanoparticle (GNP) geometries conjugated with fluorescent dyes.
  • To assess the impact of metal-enhanced fluorescence (MEF) on imaging sensitivity.

Main Methods:

  • Preparation of gold nanospheres and nanorods (GNRs) with varying aspect ratios.
  • Conjugation of GNPs with Fluorescein, Rhodamine B, and Sulforhodamine B using PEG linkers.
  • Application of diffusion reflection (DR) for deep-volume measurements up to 1cm in phantoms.
  • Utilizing fluorescent lifetime imaging microscopy (FLIM) for surface and solution imaging, recording fluorescence lifetimes and intensities.

Main Results:

  • Diffusion reflection successfully detected GNP presence in tissue-imitating phantoms up to 1cm depth.
  • FLIM demonstrated fluorescence quenching with Fluorescein and metal-enhanced fluorescence (MEF) with Rhodamine B and Sulforhodamine B.
  • MEF was observed when the dye's absorption peak slightly exceeded the GNP plasmon resonance peak.
  • The combined system exhibited high sensitivity due to MEF and the inherent sensitivity of FLIM and DR.

Conclusions:

  • The combination of FLIM and DR, enhanced by MEF, provides a highly sensitive platform for molecular and functional imaging.
  • Gold nanoparticles, particularly GNRs, can be effectively utilized with these imaging techniques.
  • The observed MEF phenomenon is crucial for enhancing signal intensity in specific dye-GNP combinations.
  • This integrated approach holds significant promise for advancing biomedical imaging capabilities.