title: [MRI, geometric distortion of the image and stereotaxy].
abstract: The MRI technology may be the starting-point of geometric distorsion. The mathematical preciseness of a spatial location may be disturbed and alter the guidance of an MRI interventionnal act, especially in stereotactic brain biopsy. A review of the literature shows errors of 1 to 1.5 mm. Our results show an error of 0.16 +/- 0.66 mm. The control of quality: homogeneity and calibration of magnetic-field gradients, permit an improve of the balistic preciseness and give permission to realize the guidance of a stereotactic brain biopsy with the alone MRI.
authors.affiliation: Service de Radiologie, HIA Val-de-Grâce, Paris.
authors.forename: C
authors.initials: C
authors.lastname: Derosier
authors.forename: G
authors.initials: G
authors.lastname: Delegue
authors.forename: T
authors.initials: T
authors.lastname: Munier
authors.forename: C
authors.initials: C
authors.lastname: Pharaboz
authors.forename: G
authors.initials: G
authors.lastname: Cosnard
mesh_terms: D001931:Brain Mapping / Q000379:methods; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D013238:Stereotaxic Techniques
vernacular_title: IRM, distorsion géométrique de l'image et stéréotaxie.