Algorithm for accurate three-dimensional reconstruction of...

G - Physics – 06 – T

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G06T 17/00 (2006.01) G06T 3/00 (2006.01) G06T 7/20 (2006.01) G06T 17/10 (2006.01) G06T 17/20 (2006.01) A61B 6/12 (2006.01)

Patent

CA 2478088

A computer-implemented software system and method for performing dynamic, three-dimensional reconstruction of a non-linear implanted medical device from biplane x-ray images. A biplane radiographic image of a calibration object is used to compute the relationship between a three-dimensional coordinate system and the two-dimensional coordinate system for each image plane. These relationships are used to superimpose a three-dimensional device model onto each biplane image pair. An iterative, active contour model, initiated by a user-specified curved template, solves for the three-dimensional device centerline coordinates. Device reconstruction is repeated at each time point associated with each image pair. Algorithm output is available for test development, structural analysis or other clinically relevant applications.

L'invention concerne un procédé et un système logiciel mis en oeuvre par un ordinateur, permettant d'effecteur une reconstruction tridimensionnelle dynamique d'un dispositif médical non linéaire implanté à partir de radiographies biplanes. Une image radiographique biplane d'un objet d'étalonnage est utilisée pour calculer la relation entre un système de coordonnées tridimensionnel et le système de coordonnées bidimensionnel pour chaque plan image. Ces relations sont utilisées pour superposer un modèle de dispositif tridimensionnel à chaque paire d'image biplane. Un modèle de contour actif itératif, déclenché par un modèle incurvé spécifié par l'utilisateur, permet de résoudre les coordonnées centrales du dispositif tridimensionnel. La reconstruction d'un dispositif est répétée en chaque point temporel associé à chaque pair d'image. Une sortie algorithme est disponible pour le développement d'essais, l'analyse structurale et d'autres applications pertinentes d'un point de vue clinique.

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