RT Journal Article SR Electronic T1 FDA Investigates the Safety of Brain Perfusion CT JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 2 OP 3 DO 10.3174/ajnr.A1967 VO 31 IS 1 A1 M. Wintermark A1 M.H. Lev YR 2010 UL http://www.ajnr.org/content/31/1/2.abstract AB