RT Journal Article SR Electronic T1 Sonography of the Normal and Abnormal Intact Lumbar Spinal Canal JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 791 OP 795 VO 5 IS 6 A1 Portela, Luiz A. YR 1984 UL http://www.ajnr.org/content/5/6/791.abstract AB