RT Journal Article SR Electronic T1 Emergency Radiology. Imaging and Intervention JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology DO 10.3174/ajnr.A0882 YR 2007 UL http://www.ajnr.org/content/early/2007/12/07/ajnr.A0882.abstract AB