RT Journal Article SR Electronic T1 Reply: JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology DO 10.3174/ajnr.A2998 A1 G. Saigal A1 M.J.D. Post YR 2012 UL http://www.ajnr.org/content/early/2012/01/26/ajnr.A2998.abstract AB