Affiliation: | a Service de neuroradiologie, groupe hospitalier Pitié Salpêtrière, 47-83, boulevard de l’hôpital, 75651 Paris, France b UPMC, UMI 209, UMMISCO, université Paris VI, 75005 Paris, France c IRD, UMI 209, UMMISCO, 93143 Bondy cedex, France d General Electric Medical System, Buc, France |