Intra-operative "real-time" navigation system updated with open MRI. - Kosaku Amano; Yoshihiro Muragaki; Hiroshi Iseki; Takashi Maruyama; Madoka Sugiura; Masayuki Yamato; Ryuuiti Matida; Tomokatsu Hori; Kintomo Takakura (CARS, 2001)