[1] Department of Medical Imaging,
[2] Cliniques Universitaires Saint Luc,undefined
[3] Université Catholique de Louvain,undefined
[4] Avenue Hippocrate 10,undefined
[5] B-1200 Brussels,undefined
[6] Belgium (e-mail: cosnard@rdgn.ucl.ac.be,undefined
[7] Tel.: + 32-2-7 64 29 33,undefined
[8] Fax: + 32-2-7 70 55 74),undefined
[9] Department of Neurosurgery,undefined
[10] Cliniques Universitaires Saint Luc,undefined
[11] Université Catholique de Louvain,undefined
[12] Aveune Hippocrate 10,undefined
[13] B-1200 Brussels,undefined
[14] Belgium,undefined