title: Reply.
authors.affiliation: Department of Radiology University of Minnesota Minneapolis, Minnesota.
authors.forename: S Khanipour
authors.initials: SK
authors.lastname: Roshan
authors.affiliation: Department of Radiology University of Minnesota Minneapolis, Minnesota.
authors.forename: A M
authors.initials: AM
authors.lastname: McKinney
authors.affiliation: Department of Neuroradiology John Radcliffe Hospital Oxford University Hospitals Oxford, UK.
authors.forename: S J
authors.initials: SJ
authors.lastname: Karia
authors.affiliation: Department of Radiology University of Minnesota Minneapolis, Minnesota.
authors.forename: H
authors.initials: H
authors.lastname: Tore
authors.affiliation: Department of Radiology University of Minnesota Minneapolis, Minnesota.
authors.forename: J B
authors.initials: JB
authors.lastname: Rykken