A simple method of cranial tracking for conscious patients and its application to computer-assisted endoscopic sinus surgery under local anesthesia. - Yoshinobu Sato; Hiraku Tsuchiya; Sadato Yoden; Manabu Tamura; Masahiro Kawamoto; Takeshi Kubo; Takashi Fujikado; Shinichi Tamura (CARS, 2001)