Controlling delivery of radiotherapy

Details Controlling delivery of radiotherapy Controlling delivery of radiotherapy

A - Human Necessities

61

N

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

Patent

CA 2324446

An algorithm to generate discrete beam intensity modulation by dynamic multileaf collimation (MLC) is described which incorporates constraints on minimum allowed leaf separations. MLC positioning information is derived simultaneously for all leaf pairs and backup diaphragms as they progress across the field and a feedback mechanism allows corrections to be applied to eliminate potential violations of minimum separation conditions and any underexposure in the inter-leaf-tongue-and-groove region as they are encountered. The resulting motion correctly delivers the intended modulation and is physically realisable. Results of the algorithm can also alternatively be interpreted as defining a series of static fields to deliver the same modulation.

L'invention porte sur un algorithme produisant des modulations discrètes de l'intensité de rayons par collimation dynamique multifoliaire (MLC) incluant des contraintes quant aux séparations minimales permises entre feuilles. L'information MLC de positionnement est extraite simultanément pour toutes les paires de feuilles et pour les diaphragmes de sauvegarde alors qu'ils progressent dans le champ et qu'un mécanisme de rétroaction autorise les corrections à appliquer pour éliminer les violations potentielles des conditions de séparation minimale et toute sous-exposition pouvant apparaître dans la zone interfoliaire des languettes et rainures. Le mouvement résultant, qui produit correctement la modulation souhaitée, est physiquement réalisable. Les résultats de l'algorithme peuvent en variante s'interpréter comme définissant une série de champs statiques produisant la même modulation.

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