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Related Experiment Videos

Mucosal exposure to light during routine endoscopy.

N S Nishioka1, K T Schomacker

  • 1Medical Services, Gastrointestinal Unit, and Wellman Laboratories of Photomedicine, Massachusetts General Hospital, Boston, USA.

Gastrointestinal Endoscopy
|April 14, 1999
PubMed
Summary

Gastrointestinal endoscopes deliver high visible light levels to tissues, potentially exceeding safety standards by 40-fold. The gastrointestinal tract likely possesses significant light tolerance, as endoscopy is considered safe.

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Area of Science:

  • Biomedical Optics
  • Gastroenterology
  • Medical Device Engineering

Background:

  • Spectral irradiance from gastrointestinal endoscopes was measured.
  • Light delivery to the mucosal surface during procedures was estimated.

Purpose of the Study:

  • Quantify light exposure during gastrointestinal endoscopy.
  • Compare measured light levels to established safety standards.

Main Methods:

  • Measured spectral irradiance of seven endoscopes using a calibrated spectroradiometer.
  • Analyzed light delivery as a function of wavelength.

Main Results:

  • Maximum irradiance reached 8.0 W/cm² in transillumination mode and 1.6 W/cm² in standard viewing mode.

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  • Most light energy was concentrated in the visible spectrum (400-700 nm).

    • Conclusions:

    • Endoscopic light exposure can significantly exceed skin exposure standards.
    • The gastrointestinal tract demonstrates high tolerance to light, supporting the safety of endoscopy.