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In this paper we present a methodology to address the problem of brain tissuedeformation referred to as 'brain-shift'. This deformation occurs throughout aneurosurgery intervention and strongly alters the accuracy of theneuronavigation systems used to date in clinical routine which rely solely onpre-operative patient imaging to locate the surgical target, such as a tumouror a functional area. After a general description of the framework of ourintra-operative image-guided system, we describe a procedure to generatepatient specific finite element meshes of the brain and propose a biomechanicalmodel which can take into account tissue deformations and surgical proceduresthat modify the brain structure, like tumour or tissue resection.

Bio-Mechanical Model of the Brain for a Per-Operative Image-Guided Neuronavigator Compensating for "Brain-Shift" Deformations