RT Journal Article SR Electronic T1 Transitions JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 1 OP 1 VO 27 IS 1 A1 Robert I. Grossman YR 2006 UL http://www.ajnr.org/content/27/1/1.1.abstract AB