RT Journal Article SR Electronic T1 Sizing rings: a simple technique for measuring intracranial lesions. JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 1449 OP 1451 VO 16 IS 7 A1 J A Horton YR 1995 UL http://www.ajnr.org/content/16/7/1449.abstract AB