Fig. 8.

Example result of closest point distances (in mm) after the using the surface Laplacian equation based extrapolation filter. Two views of the liver have been shown (anterior view in (a) and posterior view in (b)). Every node now has a signed closest point distance value assigned to it. It should be noted that the sign of the closest point distances have been flipped for nodes in the posterior surface (shown in b). These signed closest point distances are assigned as displacement boundary conditions to the finite element model in a co-ordinate system that is represented by the normal and two tangential directions to the surface.