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Related Experiment Video

Updated: Apr 2, 2026

Simultaneous Multicolor Imaging of Biological Structures with Fluorescence Photoactivation Localization Microscopy
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Label-free whole slide virtual multi-staining using dual-excitation photon absorption remote sensing microscopy.

James E D Tweel1, Benjamin R Ecclestone1, James A Tummon Simmons1

  • 1PhotoMedicine Labs, Systems Design Engineering, University of Waterloo, Waterloo, ON, Canada.

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|March 31, 2026
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Summary

Dual-excitation Photon Absorption Remote Sensing (PARS) microscopy enables non-destructive virtual staining of tissues. This advanced technique provides multiple stain visualizations from a single section, enhancing histological analysis.

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Area of Science:

  • Biomedical Imaging
  • Histopathology
  • Microscopy

Background:

  • Histochemical staining is crucial for tissue visualization but is destructive and limits subsequent analyses.
  • Label-free microscopy offers a non-destructive alternative, allowing for multiple virtual stains from a single tissue section.

Purpose of the Study:

  • To introduce a dual-excitation Photon Absorption Remote Sensing (PARS) microscopy system for enhanced virtual staining.
  • To demonstrate the capability of this system for generating various routine and specialized histological stains non-destructively.

Main Methods:

  • Development of a dual-excitation PARS microscopy system utilizing 266 nm (UVC) and 355 nm (UVA) wavelengths.
  • Application of the RegGAN framework for generating virtual stains from label-free microscopy data.
  • Testing across human and murine tissues for standard (H&E) and special stains (Masson's trichrome, PAS, Jones methenamine silver).

Main Results:

  • The 355 nm excitation source extends PARS contrast to include red blood cells, melanin, and stromal architecture.
  • Dual-excitation PARS demonstrated improved virtual stain similarity compared to single-wavelength inputs.
  • Expert pathologist evaluation indicated virtual stains achieved diagnostic quality comparable to chemical stains under specific conditions.

Conclusions:

  • Dual-excitation PARS is a promising non-destructive method for multi-stain virtual histology.
  • This technology enables multiple visualizations from a single tissue section without physical destruction.
  • The generated virtual stains show potential for diagnostic applications, complementing traditional methods.