V.G. Duffy (Ed.): DHM/HCII 2013, Part II, LNCS 8026, pp. 324–332, 2013. © Springer-Verlag Berlin Heidelberg 2013 Automatic 3D Reconstruction of Transfemoral Residual Limb from MRI Images Giorgio Colombo 1 , Giancarlo Facoetti 2 , Caterina Rizzi 2,3 , Andrea Vitali 3 , and Alessandro Zanello 4 1 Department of Mechanical Engineering, Polytechnic of Milan, Milan, Italy giorgio.colombo@polimi.it 2 COGES Centre, University of Bergamo (BG), Dalmine, Italy giancarlo.facoetti@unibg.it 3 Department of Engineering, University of Bergamo (BG), Dalmine, Italy {caterina.rizzi,andrea.vitali1}@unibg.it 4 Humanitas Gavazzeni Clinic, Bergamo, Italy alessandro.zanello@gavazzeni.it Abstract. This work is part a new design platform for lower limb prosthesis centered on the patient’s digital model and based on the integrated use of virtual prototyping tools. In particular, 3D detailed model of residual limb, that includes not only the external skin but also bones and soft tissues, is needed for socket design and finite element analysis to study the socket-residual limb interaction. In this paper, we present a procedure for 3D automatic reconstruction of the residual starting from MRI images. The output is a 3D geometric model, in a neutral format (IGES), which permits CAD information exchange among the modules composing the design platform. The reconstruction procedure consists of three different phases: image pre- processing, voxel segmentation, 3D models generation. Results have been considered promising and future activities to enhance the algorithm performance have been planned. Keywords: Lower limb prosthesis design, MRI, 3D automatic reconstruction, segmentation. 1 Introduction Nowadays, lower limb prosthesis design is carried out mostly following a hand-made procedure, and the final result heavily depends on the prosthetics’ skills. In this context, we propose a new design platform for lower limb prosthesis design [1] whose main goal is to replace the traditional process with a virtual environment. The platform exploits several ICT tools such as 3D CAD and FEA (Finite Element Analysis) systems as well as biomechanical human models. The platform comprehends two environments: the Prosthesis Modelling Lab and the Virtual Testing Lab. The first one allows the configuration and generation of the 3D prosthesis model, while the second permits to virtually set up the artificial leg and simulate patient’s postures and gait.