Effects of CT threshold value to make a surface bone model on accuracy of shape-based registration in a CT-based navigation system for hip surgery. - Nobuhiko Sugano; Toshihiko Sasama; Yoshikazu Nakajima; Yoshinobu Sato; Takashi Nishii; T. Iida; K. Nakagawa; Keiro Ono; Shunsaku Nishihara; Shinichi Tamura; Kazuo Yonenobu; Takahiro Ochi (CARS, 2001)