Stray light mitigation in a novel endoscope for fallopian tubes

Elizabeth Swan, Tyler Tate, Molly Keenan, John F. Black, Urs Utzinger, Jennifer K Barton

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Stray light in an endoscope largely contributes to whether a signal can be detected or not. This FRED analysis used a novel endoscope designed for the fallopian tubes to show how common endoscope elements cause stray light contamination, and to offer suggestions on how to mitigate it. Standard and advanced optical raytracing was performed. Raytrace reports determined which ray paths caused the highest power and irradiance distributions after reflecting one or more times from an element in the system. The analysis revealed that the cover plate introduced significantly more stray light into the system than other endoscope components. The imaging lenses and variable stop reflectivity had a negligible impact on the signal. To obtain acceptable signal-to-noise ratio, the source numerical aperture (NA) was lowered to 0.35 and 0.25 to keep the stray light within the same order of magnitude and an order of magnitude lower, respectively than the desired signal. There was a single specular reflection off of the cover plate distal surface. This illumination reflected back into the imaging fiber without first scattering off the tissue, which resulted in high stray power at the back of the imaging lenses. The specular light appeared brighter at higher source NAs and saturated the desired signal at the edge of the imaging fiber. An NA between 0.25 and 0.35 provides maximum illumination to image the tissue, with minimal stray light degrading the desired signal.

Original languageEnglish (US)
Title of host publicationProgress in Biomedical Optics and Imaging - Proceedings of SPIE
PublisherSPIE
Volume9304
ISBN (Print)9781628413946
DOIs
StatePublished - 2015
EventEndoscopic Microscopy X; and Optical Techniques in Pulmonary Medicine II - San Francisco, United States
Duration: Feb 7 2015Feb 9 2015

Other

OtherEndoscopic Microscopy X; and Optical Techniques in Pulmonary Medicine II
CountryUnited States
CitySan Francisco
Period2/7/152/9/15

Fingerprint

Stray light
endoscopes
Endoscopy
Fallopian Tubes
Endoscopes
tubes
Light
Imaging techniques
numerical aperture
Lenses
Lighting
Tissue
illumination
lenses
Fibers
fibers
specular reflection
Signal-To-Noise Ratio
Signal to noise ratio
irradiance

Keywords

  • endoscope
  • fallopian tube
  • FRED
  • optic
  • raytracing
  • stray light

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Radiology Nuclear Medicine and imaging

Cite this

Swan, E., Tate, T., Keenan, M., Black, J. F., Utzinger, U., & Barton, J. K. (2015). Stray light mitigation in a novel endoscope for fallopian tubes. In Progress in Biomedical Optics and Imaging - Proceedings of SPIE (Vol. 9304). [93041O] SPIE. https://doi.org/10.1117/12.2078671

Stray light mitigation in a novel endoscope for fallopian tubes. / Swan, Elizabeth; Tate, Tyler; Keenan, Molly; Black, John F.; Utzinger, Urs; Barton, Jennifer K.

Progress in Biomedical Optics and Imaging - Proceedings of SPIE. Vol. 9304 SPIE, 2015. 93041O.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Swan, E, Tate, T, Keenan, M, Black, JF, Utzinger, U & Barton, JK 2015, Stray light mitigation in a novel endoscope for fallopian tubes. in Progress in Biomedical Optics and Imaging - Proceedings of SPIE. vol. 9304, 93041O, SPIE, Endoscopic Microscopy X; and Optical Techniques in Pulmonary Medicine II, San Francisco, United States, 2/7/15. https://doi.org/10.1117/12.2078671
Swan E, Tate T, Keenan M, Black JF, Utzinger U, Barton JK. Stray light mitigation in a novel endoscope for fallopian tubes. In Progress in Biomedical Optics and Imaging - Proceedings of SPIE. Vol. 9304. SPIE. 2015. 93041O https://doi.org/10.1117/12.2078671
Swan, Elizabeth ; Tate, Tyler ; Keenan, Molly ; Black, John F. ; Utzinger, Urs ; Barton, Jennifer K. / Stray light mitigation in a novel endoscope for fallopian tubes. Progress in Biomedical Optics and Imaging - Proceedings of SPIE. Vol. 9304 SPIE, 2015.
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