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.A2926 A1 F. Al-Ali YR 2011 UL http://www.ajnr.org/content/early/2011/11/17/ajnr.A2926.abstract AB