Compact dual-view endoscope without field obscuration

Rajender Katkam, Bhaskar Banerjee, Chih Yu Huang, Xiaoyin Zhu, Luis Ocampo, Jerri Lynn Kincade, Rongguang Liang

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


We have developed a compact dual-view endoscopic probe without field obscuration to address the need of simultaneously observing forward and backward fields of view (FOVs) in the colon. The objective is compact with the forward-view and rear-view optical paths sharing the same optical elements. The compact objective is new in that no FOV is blocked. The illumination for forward-view imaging is provided by the cylindrical light guide and backward illumination is achieved with a reflector. We have designed, prototyped, and tested the endoscope by comparing it to a standard clinical colonoscope. We will discuss the system concept, objective design, fabrication of the freeform lens, and test results.

Original languageEnglish (US)
Article number076007
JournalJournal of biomedical optics
Issue number7
StatePublished - Jul 1 2015


  • colonoscope
  • endoscopic imaging
  • illumination design
  • nonspherical lens design
  • optical design and fabrication

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Biomedical Engineering


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