Non-invasive measurement of oxygen saturation in the spinal vein using SWI: Quantitative evaluation under conditions of physiological and caffeine load. - Noriyuki Fujima; Kohsuke Kudo; Satoshi Terae; Kinya Ishizaka; Rie Yazu; Yuri Zaitsu; Khin Khin Tha; Daisuke Yoshida; Akiko Tsukahara; E. Mark Haacke; Makoto Sasaki; Hiroki Shirato (NeuroImage, 2011)