Shadow-free motorized capsule enables accurate beam positioning and sectorized OCT imaging of the esophagus

Antonio López-Marín, Geert Springeling, Robert Beurskens, Heleen Van Beusekom, Antonius Van Der Steen, Arjun D. Koch, Brett E. Bouma, Robert A. Huber, Gijs Van Soest, Tianshi Wang

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

1 Citation (Scopus)
30 Downloads (Pure)


In this study, we demonstrate a 12x36 mm motorized capsule for OCT imaging of the esophagus. The capsule produces unobstructed images by using a distal reflector design, thus avoiding shadow caused by the motor wires. The motor synchronous control enables three working modes: circumferential imaging, angular sector imaging and accurate beam positioning. Distortion artifacts shown in the sector imaging were found to be induced by velocity changes of the motor. We specifically characterized the motor speed and found a symmetric and repeatable behavior during sector scanning. Resampling of the sector images A-lines was carried out to achieve uniform angular spacing according to the measured speed profile. Also, distortion between consecutive sector frames was corrected using image registration to achieve stable imaging.

Original languageEnglish
Title of host publicationProceedings of SPIE
Subtitle of host publicationEndoscopic Microscopy XV
EditorsGuillermo J. Tearney, Thomas D. Wang, Melissa J. Suter
Number of pages7
ISBN (Electronic)9781510631915
ISBN (Print)978-1-5106-3191-5
Publication statusPublished - 2020
EventEndoscopic Microscopy XV 2020 - San Francisco, United States
Duration: 1 Feb 20202 Feb 2020

Publication series

NameProceedings of SPIE


ConferenceEndoscopic Microscopy XV 2020
CountryUnited States
CitySan Francisco


  • Gradient index lenses
  • Image reconstruction
  • Light beams
  • Magnetic fields
  • Optical Coherence Tomography
  • Optical imaging


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