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Capsule endoscopy, or wireless or video capsule endoscopy, is a diagnostic procedure for examining the entire gastrointestinal tract. Patients swallow a capsule about the size of a vitamin tablet. The capsule is equipped with a transmitter, a battery, an LED light source, and a color video camera to capture images throughout the gastrointestinal tract. This procedure is particularly useful for diagnosing conditions such as Crohn's disease, ulcerative colitis, tumors, polyps, ulcers,...
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Related Experiment Video

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Photoacoustic Cystography
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Side-viewing photoacoustic waveguide endoscopy.

Christopher Miranda1, Ethan Marschall1, Blake Browning1

  • 1School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ 85281, USA.

Photoacoustics
|April 24, 2020
PubMed
Summary
This summary is machine-generated.

This study introduces the first side-viewing photoacoustic waveguide (PWG) endoscope for minimally invasive, deep-tissue imaging. The compact PWG demonstrates efficient light and sound guidance for high-resolution photoacoustic imaging in various tissues.

Keywords:
Photoacoustic endoscopy waveguide

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Area of Science:

  • Biomedical Optics
  • Medical Imaging
  • Optical Engineering

Background:

  • Minimally invasive endoscopy requires advanced imaging techniques.
  • Photoacoustic imaging offers high contrast and resolution for deep-tissue visualization.
  • Existing photoacoustic endoscopes are often too large for certain clinical applications.

Purpose of the Study:

  • To characterize a novel side-viewing photoacoustic waveguide (PWG) endoscope.
  • To evaluate the PWG's performance in phantom and animal tissues.
  • To establish the potential of PWG for deep-tissue photoacoustic imaging.

Main Methods:

  • Characterization of the PWG endoscope using carbon fiber threads in phantom and animal tissues.
  • Assessment of photoacoustic signal transmission and attenuation along the waveguide.
  • Measurement of imaging depth and device dimensions.

Main Results:

  • Photoacoustic signals were guided with minimal attenuation over 5.5 and 10.0 cm lengths.
  • Deep-tissue photoacoustic imaging was achieved, with signals detected up to 8.0 mm.
  • The device has an outer diameter just over 1.0 mm, with potential for further miniaturization.

Conclusions:

  • The side-viewing PWG endoscope enables 360°, deep-tissue photoacoustic imaging.
  • Its compact size and performance make it suitable for pre-clinical and clinical applications.
  • This technology represents a significant advancement for photoacoustic endoscopy.