Print Email Facebook Twitter Shadow-free motorized capsule enables accurate beam positioning and sectorized OCT imaging of the esophagus Title Shadow-free motorized capsule enables accurate beam positioning and sectorized OCT imaging of the esophagus Author López-Marín, Antonio (Erasmus MC) Springeling, Geert (Erasmus MC) Beurskens, Robert (Erasmus MC) Van Beusekom, Heleen (Erasmus MC) van der Steen, A.F.W. (TU Delft ImPhys/Medical Imaging; Erasmus MC; Chinese Academy of Sciences) Koch, Arjun D. (Erasmus MC) Bouma, Brett E. (Massachusetts General Hospital/Harvard Medical School) Huber, Robert A. (University of Lübeck) Van Soest, Gijs (Erasmus MC) Wang, Tianshi (Erasmus MC) Contributor Tearney, Guillermo J. (editor) Wang, Thomas D. (editor) Suter, Melissa J. (editor) Date 2020 Abstract 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. Subject Gradient index lensesImage reconstructionLight beamsMagnetic fieldsOptical Coherence TomographyOptical imaging To reference this document use: http://resolver.tudelft.nl/uuid:b1563fb1-ff78-44e3-821d-ddbff633fb9b DOI https://doi.org/10.1117/12.2545689 Publisher SPIE ISBN 978-1-5106-3191-5 Source Proceedings of SPIE: Endoscopic Microscopy XV, 11214 Event Endoscopic Microscopy XV 2020, 2020-02-01 → 2020-02-02, San Francisco, United States Series Proceedings of SPIE Part of collection Institutional Repository Document type conference paper Rights © 2020 Antonio López-Marín, Geert Springeling, Robert Beurskens, Heleen Van Beusekom, A.F.W. van der Steen, Arjun D. Koch, Brett E. Bouma, Robert A. Huber, Gijs Van Soest, Tianshi Wang Files PDF 112140O.pdf 3.85 MB Close viewer /islandora/object/uuid:b1563fb1-ff78-44e3-821d-ddbff633fb9b/datastream/OBJ/view