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Neurochirurgie guidée par l'image : visualisation mixte et quantification des déformations cérébrales peropératoires à l'aide de reconstructions stéréoscopiques de la surface corticale

Perrine Paul-Gilloteaux 1
1 VisAGeS - Vision, Action et Gestion d'informations en Santé
INSERM - Institut National de la Santé et de la Recherche Médicale : U746, Inria Rennes – Bretagne Atlantique , IRISA-D5 - SIGNAUX ET IMAGES NUMÉRIQUES, ROBOTIQUE
Abstract : Image guidance mainly consists of displaying preoperative images related to the neurosurgeon's view of the operative field. In most available commercial neuronavigation systems, limitations are limited point of view and difficulty to understand 3D complex scenes. Furthermore, after opening the arachnoid, cortical surface deformation is significant and the preoperative information no longer corresponds to the anatomical reality of the patient. We present a new approach referred to as augmented virtuality for displaying intraoperative views of the operative field over 3D multimodal preoperative images onto an external screen during surgery. 3D surfaces meshes of the operative field were then generated using stereopsis. An approach for correcting the intraoperative location of regions of interest near the surface, based on 3D surface meshes registration and on tracking in video image sequences is also presented. The approach consists in using surface meshes obtained by stereoscopic reconstructions from the microscope oculars. A visible light image is associated with this surface. Between two acquisitions of surfaces meshes, landmarks are tracked in the video. The cost function for surface matching is then composed by a dissimilarity metric based on both Euclidian distance and intensity correlation and an additional term which is the deformation field representing the respect of landmark matching. Good performance of our methods was assessed by reference comparison, using phantoms in clinical settings and on some real clinical cases.
Keywords : computer vision
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Perrine Paul-Gilloteaux. Neurochirurgie guidée par l'image : visualisation mixte et quantification des déformations cérébrales peropératoires à l'aide de reconstructions stéréoscopiques de la surface corticale. Vision par ordinateur et reconnaissance de formes [cs.CV]. Universite de Rennes 1, 2006. Français. ⟨tel-02908473⟩

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