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High-resolution Fiber-optic Microendoscopy for in situ Cellular Imaging
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Ultraminiature optical design for multispectral fluorescence imaging endoscopes.

Tyler H Tate1, Molly Keenan2, John Black3

  • 1University of Arizona, College of Optical Sciences, Tucson, Arizona, United States.

Journal of Biomedical Optics
|March 24, 2017
PubMed
Summary

A novel miniature multispectral endoscopic imaging system was developed for natural orifice imaging. This technology enables broad wavelength reflectance and fluorescence imaging, potentially aiding in early cancer detection.

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Area of Science:

  • Biomedical Engineering
  • Optical Imaging
  • Endoscopy

Background:

  • Developing advanced endoscopic tools is crucial for minimally invasive diagnostics.
  • Multispectral imaging offers enhanced contrast for tissue characterization.
  • Miniaturization is key for accessing small anatomical lumens.

Purpose of the Study:

  • To develop a miniature wide-field multispectral endoscopic imaging system.
  • To enable both reflectance and fluorescence imaging across a broad wavelength range.
  • To assess the system's feasibility for natural orifice imaging and potential diagnostic applications.

Main Methods:

  • A 0.8-mm diameter endoscope was designed with a 70-degree field of view.
  • Five lasers (250-642 nm) illuminated the target area via a multimode fiber.
  • Imaging utilized a 300-µm diameter three-element lens system coupled to a 3000-element fiber bundle.
  • The system was tested using phantoms and porcine reproductive tracts.

Main Results:

  • The developed endoscope achieved near-design performance characteristics.
  • Monochromatic, pseudo-white-light, and composite fluorescence images were successfully acquired.
  • The system demonstrated capability for imaging in small lumens like fallopian tubes.

Conclusions:

  • A highly capable, miniature multispectral fluorescence imaging system has been successfully developed.
  • The system's design supports broad wavelength imaging for reflectance and fluorescence.
  • This technology shows promise for applications in early cancer detection and diagnostics.