Unclear Value of Positional MR Angiography in Evaluating Cerebral Venous Outflow Hemodynamics

We read with interest the article entitled “Positional Venous MR Angiography: An Operator-Independent Tool to Evaluate Cerebral Venous Outflow Hemodynamics,” originally published in the American Journal of Neuroradiology on-line on November 3, 2011.[1][1] We believe that the authors did not