RT Journal Article SR Electronic T1 Sources of Variability in Measuring Carotid Stenosis on Time-Resolved Contrast-Enhanced MR Angiograms JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 178 OP 179 VO 23 IS 2 A1 Patrick Turski YR 2002 UL http://www.ajnr.org/content/23/2/178.abstract AB