TY - JOUR T1 - Unclear Value of Positional MR Angiography in Evaluating Cerebral Venous Outflow Hemodynamics JF - American Journal of Neuroradiology JO - Am. J. Neuroradiol. SP - E30 LP - E30 DO - 10.3174/ajnr.A2991 VL - 33 IS - 2 AU - K. Dolic AU - K. Marr AU - R. Zivadinov Y1 - 2012/02/01 UR - http://www.ajnr.org/content/33/2/E30.abstract N2 - ER -