RT Journal Article SR Electronic T1 Subtraction Helical CT Angiography of Intra- and Extracranial Vessels: Technical Considerations and Preliminary Experience—Rediscovery of Matched Mask Bone Elimination? JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 1491 OP 1492 VO 24 IS 7 A1 Venema, Hank W. A1 Heeten, Gerard J. den YR 2003 UL http://www.ajnr.org/content/24/7/1491.abstract AB