作者单位:INRIA Centre Rennes, Bretagne Atlantique, INSERM, 35000 Rennes, France[1]INRIA Centre Rennes, Bretagne Atlantique, INSERM, 35000 Rennes, France, Department of Neurosurgery[2]LSIIT, University of Strasbourg, P?le API, Boulevard S. Brant, 67412 Illkirch, France[3]