Megavoltage computed tomography during radiotherapy

Details Megavoltage computed tomography during radiotherapy Megavoltage computed tomography during radiotherapy

A - Human Necessities

61

N

A61N 5/10 (2006.01) A61B 6/03 (2006.01) A61B 6/06 (2006.01)

Patent

CA 2368764

Reduced dose megavoltage CT images are obtained using low flux data resulting from leakage through modulating shutters and/or collected by other means and augmented by incomplete high flux data collected during radiation therapy. The ability to construct tomographic projection sets from significantly varying flux rate data is provided by the use of air scans windowed to account for variations in mechanical leaf movement. These methods are also provide a means of imaging the patient entirely during radiation therapy treatments without any additional scan time.

On obtient des images de tomographie assistée par ordinateur générées en utilisant une tension de l'ordre du mégavolt à dose réduite au moyen des données de faible flux provenant de fuites au niveau des obturateurs de modulation et/ou collectées par d'autres moyens et augmentées des données de flux élevé incomplètes collectées au cours d'une radiothérapie. Le recours à des balayages de l'air fenêtrés pour rendre compte des variations des mouvements de feuilles mécaniques permet de construire des appareils de projection tomographiques à partir de données de vitesse de flux variant sensiblement. Ces procédés permettent également de visualiser intégralement le patient au cours de traitements radiothérapeutiques, sans temps de balayage optique supplémentaire.

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