Journal of Rehabilitation Research and Development
Vol. 39 No. 5, September/October 2002
Pages 609-614

Processing computer tomography bone data for prosthetic finite element modeling: A technical note

Rakesh Saxena, PhD; Santosh G. Zachariah, PhD; Joan E. Sanders, PhD
Department of Bioengineering, University of Washington, Seattle, WA

Abstract — A software scheme is presented to extract the shapes of tibiae and fibulae from amputee computer tomography (CT) data for use in prosthetic finite element modeling. A snake algorithm is implemented to overcome challenges of bone-soft tissue edge detection common in this application. Means to enhance initial guess contours, ensure contour continuity, overcome point-clustering problems, and handle high-curvature regions are also described. Effectiveness of the algorithm is demonstrated on image data from a unilateral transtibial amputee subject.

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