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Proceedings Paper

Towards standardized assessment of endoscope optical performance: geometric distortion
Author(s): Quanzeng Wang; Viraj N. Desai; Ying Z. Ngo; Wei-Chung Cheng; Joshua Pfefer
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Paper Abstract

Technological advances in endoscopes, such as capsule, ultrathin and disposable devices, promise significant improvements in safety, clinical effectiveness and patient acceptance. Unfortunately, the industry lacks test methods for preclinical evaluation of key optical performance characteristics (OPCs) of endoscopic devices that are quantitative, objective and well-validated. As a result, it is difficult for researchers and developers to compare image quality and evaluate equivalence to, or improvement upon, prior technologies. While endoscope OPCs include resolution, field of view, and depth of field, among others, our focus in this paper is geometric image distortion. We reviewed specific test methods for distortion and then developed an objective, quantitative test method based on well-defined experimental and data processing steps to evaluate radial distortion in the full field of view of an endoscopic imaging system. Our measurements and analyses showed that a second-degree polynomial equation could well describe the radial distortion curve of a traditional endoscope. The distortion evaluation method was effective for correcting the image and can be used to explain other widely accepted evaluation methods such as picture height distortion. Development of consensus standards based on promising test methods for image quality assessment, such as the method studied here, will facilitate clinical implementation of innovative endoscopic devices.

Paper Details

Date Published: 31 December 2013
PDF: 8 pages
Proc. SPIE 9042, 2013 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 904205 (31 December 2013); doi: 10.1117/12.2044103
Show Author Affiliations
Quanzeng Wang, U.S. Food and Drug Administration (United States)
Viraj N. Desai, U.S. Food and Drug Administration (United States)
Univ. of Maryland, College Park (United States)
Ying Z. Ngo, U.S. Food and Drug Administration (United States)
Virginia Commonwealth Univ. (United States)
Wei-Chung Cheng, U.S. Food and Drug Administration (United States)
Joshua Pfefer, U.S. Food and Drug Administration (United States)


Published in SPIE Proceedings Vol. 9042:
2013 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments
Yongtian Wang; Xiaocong Yuan; Yunlong Sheng; Kimio Tatsuno, Editor(s)

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