Method and apparatus for modulating a radiation beam

A - Human Necessities – 61 – N

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A61N 5/10 (2006.01) G21K 1/04 (2006.01)

Patent

CA 2599311

An apparatus and method to deliver intensity modulated radiation therapy by irradiating a treatment volume with rotation of the radiation beam. The system includes a collimation device comprising a two-dimensional array of pivoting attenuating leaves, which are temporarily placed into the radiation beam path as the gantry rotates around the patient. The leaves are independently movable between a first position and a second position. The radiation beam intensity is modulated by controlling the time that each leaf is present to attenuate the beam.

L'invention concerne un appareil et un procédé destinés à fournir une radiothérapie à intensité modulée par rayonnement d'un volume de traitement avec rotation du faisceau de rayonnement. Le système comprend un dispositif de collimation comportant un réseau bidimensionnel de feuilles d'atténuation pivotantes, qui sont placées temporairement dans le passage du faisceau de rayonnement à mesure que le portique tourne autour du patient. Les feuilles peuvent être déplacées de façon indépendante entre une première et une seconde position. L'intensité du faisceau de rayonnement est modulée par commande du temps durant lequel chaque feuille est présente afin d'atténuer le faisceau.

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