Unfiltered radiation therapy

Details Unfiltered radiation therapy Unfiltered radiation therapy

A - Human Necessities

61

N

A61N 5/10 (2006.01)

Patent

CA 2643176

This is a new technique in IMRT and 3D conformal gamma radiation dose delivery using a linear accelerator with no flattening filter. The technique improves patient radiation therapy by reducing radiation scattered to surrounding normal tissue and reducing electron contamination. It increases dose rate to shorten treatment time. Linear accelerators have for decades come with a photon flattening filter to make the photon profile of planar fluence to make the dose distribution more uniform. These filters, however, resulted in fluence attenuation and contamination of the beam. Now in the age of techniques such as intensity modulated radiation therapy (IMRT) the function of the flattening filter becomes redundant. The flattening filter now merely reduces the efficiency of the beam by reducing the fluence and increasing scattered radiation. Our technique involves removal of the flattening filter for complex treatments. It uses inverse planning along with multi-leaf collimators to shape the dose distribution.

L'invention porte sur une nouvelle technique IMRT (radiothérapie de conformité à modulation d'intensité de dose de rayons gamma) 3D utilisant un accélérateur linéaire sans filtre d'aplatissement. Ladite technique améliore la radiothérapie du patient en réduisant la dispersion des radiations vers les tissus normaux environnants ainsi que la contamination par les électrons, et augmente les doses pour réduire le temps de traitement. Les accélérateurs linéaires ont depuis des décennies utilisé des photofiltres à aplatissement agissant sur le profil photonique de la fluence du plan pour rendre plus uniforme la distribution de la dose. Ces filtres ont pour effet d'atténuer la fluence et de contaminer le faisceau. Aujourd'hui'hui de nouvelles techniques telles que la radiothérapie IMRT rendent ces filtres redondants puisqu'ils ne font que réduire l'efficacité du faisceau en réduisant la fluence tout en accroissant la dispersion des radiations. Notre technique consiste à enlever lesdits filtres pour les traitements complexes en utilisant une planification inverse et des collimateurs multilames pour modeler la distribution de la dose.

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