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Journal of Healthcare Engineering
Volume 2018, Article ID 5830759, 11 pages
Research Article

Optical Design with Narrow-Band Imaging for a Capsule Endoscope

1Department of Electrical Engineering, National Formosa University, Yunlin, Taiwan
2Department of Electro-Optics Engineering, National Formosa University, Yunlin, Taiwan

Correspondence should be addressed to Chih-Ta Yen; moc.liamg@neyathihc

Received 28 November 2016; Revised 22 April 2017; Accepted 19 September 2017; Published 10 January 2018

Academic Editor: Valentina Camomilla

Copyright © 2018 Chih-Ta Yen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The study proposes narrow-band imaging (NBI) lens design of 415 nm and 540 nm of a capsule endoscope (CE). The researches show that in terms of the rate of accuracy in detecting and screening neoplastic and nonneoplastic intestinal lesions, the NBI system outperformed that of traditional endoscopes and rivaled that of chromoendoscopes. In the proposed NBI CE optical system, the simulation result shows the field of view (FOV) was 109.8°; the modulation transfer function (MTF) could achieve 12.5% at 285 lp/mm and 34.1% at 144 lp/mm. The relative illumination reaches more than 60%, and the system total length was less than 4 mm. Finally, this design provides high-quality images for a 300-megapixel 1/4 CMOS image sensor with a pixel size of 1.75 μm.