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MEEM Seminar 0809_005

From CT to NURBS: Bio-modeling with B-spline curves

Abstract

This talk deals with the first step of turning image data of parts of a human to a CAD volumetric model that is editable and can be analyzed as well as further processed, e.g. manufactured, using available CAD technologies. The underlying mathematical model is non-uniform B-splines (NURBS), the de facto standard to represent geometry in CAD systems. Our approach to converting image data to NURBS volumes consists of the following steps: (1) extract accurate boundaries from CT slices and represent them as NURBS curves, (2) generate a smooth NURBS surface from the slices, and (3) represent the material variation inside the object via a trivariate B-spline function. The emphasis of this research is placed on accuracy (precise surgical operation), speed (real-time simulation), smoothness (the discrete volumetric or faceted data should be replaced by smooth surfaces), and data reduction (the large amount of image data must be reduced by at least 60-80%). The details that are presented on the first step reveal that traditional CAD techniques are not readily adaptable to medical data to the point that several fundamental algorithms had to be completely rewritten to account for the characteristics of human organs.

Event:	MEEM Seminar 0809_005
Date:	17 July 2008 (Thursday)
Time:	11:00 am (Tea reception at 10:30 am)
Venue:	Room B6619 (MEEM Conference Room) City University of Hong Kong
Speaker:	Professor Les A. Piegl Department of Computer Science and Engineering University of South Florida, USA

About the Speaker

Les A. Piegl is Professor of Computer Science, Engineering and Information Systems at the University of South Florida where he directs USF's CAD lab. His research centers around geometric computing, software engineering, CAD/CAM, bio-engineering applications, geometric and software aspects of robotics (UAVs), e-learning and virtual enterprise modeling. He is Honorary Editor of Computer-Aided Design, the Founding Editor-in-Chief of Computer-Aided Design and Applications and Subject Editor of the Journal of Intelligent and Robotic Systems. He founded the annual CAD conferences and is now Federation Chair of the annual CAD and UAV conferences.

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