3D Liver Segmentation in Preoperative CT Images using a Level-Sets Active Surface Method - Fernández-de-Manuel, L; Rubio, JL; Ledesma-Carbayo, MJ; Pascau, J; Tellado, JM; Ramón, E; Desco, M; Santos, A (Proceedings Of The 31st Annual International Conference Of The Ieee Engineering In Medicine And Biology Society (Embc 2009), 2009)