System and method for cone beam volume computed tomography...

G - Physics – 06 – T

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G06T 11/00 (2006.01)

Patent

CA 2425323

Cone beam volume computed tomography (CBVCT) is carried out by taking signals along an orbit having a circle plus two or more arcs. A reconstruction algorithm is provided to add a correction term to the Feldkamp algorithm and to use the arc data to reconstruct data which cannot be recovered from the circle scan. The part of the reconstruction algorithm for the circle orbit uses filtering functions to simplify digital signal processing. The part of the reconstruction algorithm for the arc orbits uses a window function to resolve data redundancy.

La présente invention concerne un procédé de tomographie par ordinateur en géométrie conique (CBVCT) selon lequel on acquiert des signaux le long d'une orbite comprenant un cercle plus deux arcs au moins. Un algorithme de reconstruction permet d'ajouter un terme de correction à l'algorithme de Feldkamp et d'utiliser les données des arcs pour reconstruire les données ne pouvant être récupérées à partir du balayage du cercle. La partie de l'algorithme de reconstruction appliquée à l'orbite en cercle fait appel à des fonctions de filtrage pour simplifier le traitement numérique des signaux. La partie de l'algorithme de reconstruction appliquée aux orbites en arc fait appel à une fonction de fenêtre pour résoudre la redondance des données.

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