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Proceedings Paper

Toward automated model building from video in computer-assisted diagnoses in colonoscopy
Author(s): Dan Koppel; Chao-I Chen; Yuan-Fang Wang; Hua Lee; Jia Gu; Allen Poirson; Rolf Wolters
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Paper Abstract

A 3D colon model is an essential component of a computer-aided diagnosis (CAD) system in colonoscopy to assist surgeons in visualization, and surgical planning and training. This research is thus aimed at developing the ability to construct a 3D colon model from endoscopic videos (or images). This paper summarizes our ongoing research in automated model building in colonoscopy. We have developed the mathematical formulations and algorithms for modeling static, localized 3D anatomic structures within a colon that can be rendered from multiple novel view points for close scrutiny and precise dimensioning. This ability is useful for the scenario when a surgeon notices some abnormal tissue growth and wants a close inspection and precise dimensioning. Our modeling system uses only video images and follows a well-established computer-vision paradigm for image-based modeling. We extract prominent features from images and establish their correspondences across multiple images by continuous tracking and discrete matching. We then use these feature correspondences to infer the camera's movement. The camera motion parameters allow us to rectify images into a standard stereo configuration and calculate pixel movements (disparity) in these images. The inferred disparity is then used to recover 3D surface depth. The inferred 3D depth, together with texture information recorded in images, allow us to construct a 3D model with both structure and appearance information that can be rendered from multiple novel view points.

Paper Details

Date Published: 22 March 2007
PDF: 9 pages
Proc. SPIE 6509, Medical Imaging 2007: Visualization and Image-Guided Procedures, 65091L (22 March 2007); doi: 10.1117/12.709595
Show Author Affiliations
Dan Koppel, Univ. of California, Santa Barbara (United States)
Chao-I Chen, Univ. of California, Santa Barbara (United States)
Yuan-Fang Wang, Univ. of California, Santa Barbara (United States)
Hua Lee, Univ. of California, Santa Barbara (United States)
Jia Gu, STI Medical Systems (United States)
Allen Poirson, STI Medical Systems (United States)
Rolf Wolters, STI Medical Systems (United States)


Published in SPIE Proceedings Vol. 6509:
Medical Imaging 2007: Visualization and Image-Guided Procedures
Kevin R. Cleary; Michael I. Miga, Editor(s)

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