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Journal of Biomedical Optics • Open Access

Development of the local magnification method for quantitative evaluation of endoscope geometric distortion
Author(s): Quanzeng Wang; Wei-Chung Cheng; Nitin Suresh; Hong Hua

Paper Abstract

With improved diagnostic capabilities and complex optical designs, endoscopic technologies are advancing. As one of the several important optical performance characteristics, geometric distortion can negatively affect size estimation and feature identification related diagnosis. Therefore, a quantitative and simple distortion evaluation method is imperative for both the endoscopic industry and the medical device regulatory agent. However, no such method is available yet. While the image correction techniques are rather mature, they heavily depend on computational power to process multidimensional image data based on complex mathematical model, i.e., difficult to understand. Some commonly used distortion evaluation methods, such as the picture height distortion (DPH) or radial distortion (DRAD), are either too simple to accurately describe the distortion or subject to the error of deriving a reference image. We developed the basic local magnification (ML) method to evaluate endoscope distortion. Based on the method, we also developed ways to calculate DPH and DRAD. The method overcomes the aforementioned limitations, has clear physical meaning in the whole field of view, and can facilitate lesion size estimation during diagnosis. Most importantly, the method can facilitate endoscopic technology to market and potentially be adopted in an international endoscope standard.

Paper Details

Date Published: 9 May 2016
PDF: 13 pages
J. Biomed. Opt. 21(5) 056003 doi: 10.1117/1.JBO.21.5.056003
Published in: Journal of Biomedical Optics Volume 21, Issue 5
Show Author Affiliations
Quanzeng Wang, U.S. Food and Drug Administration (United States)
Wei-Chung Cheng, U.S. Food and Drug Administration (United States)
Nitin Suresh, U.S. Food and Drug Administration (United States)
Univ. of Maryland, College Park (United States)
Hong Hua, College of Optical Sciences, The Univ. of Arizona (United States)

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