Cone-beam ct half-cycle closed helical trajectory

A - Human Necessities – 61 – B

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A61B 6/03 (2006.01) G06T 11/00 (2006.01)

Patent

CA 2652910

A tomographic apparatus (10) includes radiation source (20), at least one radiation sensitive detector (30), and a reconstruction system (40). The radiation source (20) sweeps along a z-axis (16) and returns to its initial position in coordination with about two revolutions of the radiation source (20) about an imaging region (32) with a frequency of about half a frequency of a revolution of the radiation source (20) about the imaging region (32). The at least one radiation sensitive detector (30) detects radiation emitted by the radiation source (20) that traverses a volume of interest (52) within the imaging region (32) and generates data indicative of the detected radiation. The reconstruction system (40) reconstructs the detected data to generate an image of a subject in the volume of interest (52).

L'invention concerne un appareil tomographique (10) comprenant une source de rayonnement (20), au moins un détecteur sensible au rayonnement (30), et un système de reconstruction (40). La source de rayonnement (20) effectue un balayage le long d'un axe z (16) et retourne à sa position inititale de manière coordonnée à environ deux révolutions de la source de rayonnement (20) autour d'une zone d'imagerie (32) avec une fréquence presque équivalente à la moitié de la fréquence d'une révolution de la source de rayonnement (20) autour d'une zone d'imagerie (32). Le détecteur sensible au rayonnement (30) détecte un rayonnement émis par la source de rayonnement (20) qui traverse un volume à examiner (52) situé à l'intérieur de la zone d'imagerie (32) et génère des données indiquant le rayonnement détecté. Le système de reconstruction (40) reconstruit les données détectées pour générer une image de patient dans le volume à examiner (52).

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