RT Journal Article SR Electronic T1 Use of the Lowest Necessary Radiation Dose JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 519 OP 519 VO 25 IS 4 A1 Allan J. Fox YR 2004 UL http://www.ajnr.org/content/25/4/519.abstract AB