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Epi-illumination gradient light interference microscopy for imaging opaque structures.

Mikhail E Kandel1,2, Chenfei Hu1,2, Ghazal Naseri Kouzehgarani2,3

  • 1Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA.

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|October 18, 2019
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Summary
This summary is machine-generated.

This study introduces an epi-illumination gradient light interference microscope (epi-GLIM) for label-free imaging of thick, opaque biological tissues. Epi-GLIM overcomes scattering and absorption limitations, enabling deep tissue imaging and tomography.

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Area of Science:

  • Biophotonics and Biomedical Imaging
  • Optical Microscopy
  • Scattering and Absorption in Tissues

Background:

  • Light scattering and absorption severely limit imaging depth in biological tissues.
  • Conventional transmission imaging fails for thick, turbid, or opaque specimens.
  • Label-free imaging is crucial for preserving native biological sample states.

Purpose of the Study:

  • To develop a novel label-free phase imaging modality for deep tissue imaging.
  • To overcome limitations of scattering and absorption in thick biological samples.
  • To enable imaging of samples incompatible with traditional transmission microscopy.

Main Methods:

  • Development of an epi-illumination gradient light interference microscope (epi-GLIM).
  • Application of epi-GLIM to various man-made and biological samples.
  • Utilizing epi-GLIM data to solve the inverse scattering problem for tomographic reconstruction.

Main Results:

  • Epi-GLIM successfully images turbid structures hundreds of microns thick.
  • Demonstrated applicability to semiconductors, specimens on opaque/birefringent substrates, cells in microplates, and bulk tissues.
  • Reconstructed tomography of single cells and model organisms from epi-GLIM data.

Conclusions:

  • Epi-GLIM is a versatile label-free imaging technique for previously inaccessible samples.
  • This modality significantly advances the capability for deep tissue and opaque sample imaging.
  • Epi-GLIM data facilitates advanced optical tomography for biological research.