Complex human tissues fem models prepared by boolean operations

Numbers of biomechanical applications are making computational FEMmodeling of stress and strain (etc.) of human tissues. For theseapplications it is necessary to have FEM models of the tissues. Becauseof the tissues geometric complexity, it is often very hard orimpossible to prepare the FEM models manually in FEM system. Thereforewe have developed computer system for fully automatic FEM modelscreation from CT/MR data. Many times it is necessary to create verycomplex models as a group of parts in interactions. For example boneand screw, bone and replacement, group of bones, bone with holes etc.At the situations it is necessary to prepare the FEM models by Booleanoperations (union, subtraction and intersection) between geometry ofthe tissues and of another parts.