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Updated: Jun 5, 2026

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Angular domain transillumination imaging optimization with an ultrafast gated camera.

Fartash Vasefi1, Mohamadreza Najiminaini, Eldon Ng

  • 1Simon Fraser University The School of Engineering Science Burnaby, British Columbia, Canada.

Journal of Biomedical Optics
|January 5, 2011
PubMed
Summary

This study introduces a novel method using angular filters and time-gating to improve imaging in turbid media. It enhances visualization of small objects by distinguishing early, minimally scattered photons from later, multiply scattered ones.

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Area of Science:

  • Biomedical Optics
  • Photonics
  • Scattering Media Imaging

Background:

  • Turbid media scatter light, hindering internal structure visualization.
  • Existing angular filters struggle to differentiate early and late arriving photons.

Purpose of the Study:

  • Characterize angular distribution of photons in turbid media.
  • Combine time and angular gating for improved photon discrimination.
  • Enhance image contrast for submillimeter object visualization.

Main Methods:

  • Utilized high-aspect-ratio parallel microchannels as an angular filter.
  • Experimentally characterized photon angular distribution.
  • Integrated time-gating with angular domain imaging (ADI).

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Lensfree On-chip Tomographic Microscopy Employing Multi-angle Illumination and Pixel Super-resolution
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Main Results:

  • An angular filter with ~0.4° acceptance yielded optimal transillumination image contrast.
  • Combined time-gating and ADI improved image contrast by ~7x.
  • Enabled visualization of submillimeter absorbing objects in highly scattering media.

Conclusions:

  • Time-gating combined with angular filtering significantly enhances imaging in turbid media.
  • This approach improves the detection of small structures.
  • Offers a promising technique for advanced biomedical imaging applications.