RT Journal Article SR Electronic T1 Reply: JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP e3 OP e3 DO 10.3174/ajnr.A1230 VO 30 IS 1 A1 Chapman, P. A1 Gupta, R. YR 2009 UL http://www.ajnr.org/content/30/1/e3.abstract AB