RT Journal Article SR Electronic T1 Clot Characterization by Noncontrast CT to Predict IV tPA Failure JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology DO 10.3174/ajnr.A3041 A1 C.H. Riedel A1 A.J. Yoo YR 2012 UL http://www.ajnr.org/content/early/2012/02/09/ajnr.A3041.abstract AB