Research Papers: Imaging

Development of a catadioptric endoscope objective with forward and side views

[+] Author Affiliations
Roy Chih Chung Wang

McMaster University, Department of Engineering Physics, 1280 Main Street West, Hamilton, Ontario, L8S 4L7, Canada

M. Jamal Deen

McMaster University, Department of Electrical and Computer Engineering, 1280 Main Street, West Hamilton, Ontario, L8S 4K1, Canada

David Armstrong

McMaster University, Division of Gastroenterology, Department of Medicine, 1200 Main Street West, Hamilton, Ontario, L8N 3Z5, Canada

Qiyin Fang

McMaster University, Department of Engineering Physics, 1280 Main Street West, Hamilton, Ontario, L8S 4L7, Canada

McMaster University, School of Biomedical Engineering, 1280 Main Street West, Hamilton, Ontario, L8S 4K1, Canada

J. Biomed. Opt. 16(6), 066015 (June 21, 2011). doi:10.1117/1.3593148
History: Received December 09, 2010; Revised April 27, 2011; Accepted May 02, 2011; Published June 21, 2011; Online June 21, 2011
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Autofluorescence endoscopy is a promising functional imaging technique to improve screening of pre-cancerous or early cancer lesions in the gastrointestinal (GI) tract. Tissue autofluorescence signal is weak compared to white light reflectance imaging. Conventional forward-viewing endoscopes are inefficient in the collection of light from objects of interest along on the GI luminal wall. A key component of a complete autofluorescence endoscope is the light collection module. In this paper, we report the design, optimization, prototype development, and testing of an endoscope objective that is capable of acquiring simultaneous forward and radial views. The radial-view optical design was optimized for a balance between image quality and light collection. Modulation transfer function (MTF), entrance pupil radius, manufacturability, and field-of-view were parameters used in the lens optimization. In comparison with the typical forward-viewing endoscopes, our nonsequential ray trace simulations suggest the proposed radial-view design is more practical in the light collection. To validate the proposed simulation methods, a 3:1 scaled-up prototype was fabricated. Contrast measurements were taken with the prototype, and then compared with the simulated MTF.

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© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation

Roy Chih Chung Wang ; M. Jamal Deen ; David Armstrong and Qiyin Fang
"Development of a catadioptric endoscope objective with forward and side views", J. Biomed. Opt. 16(6), 066015 (June 21, 2011). ; http://dx.doi.org/10.1117/1.3593148


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