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US 2012/0256103 A1Published application
Modifying radiation beam shapes
AssigneeElekta AB (publ)
InventorMarco Luzzara
Life of this patent
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Abstract
A patient's lesion is localized for the purpose of administering radiation treatment by obtaining a beam shape representation along one or more beam directions of a radiation treatment device. An image corresponding to the lesion is obtained from each beam direction, and the beam shape and image are fixed to a common coordinate system to facilitate alignment.
Claims20
A multi-leaf collimator assembly, the assembly comprising:
- a first multi-leaf collimator having multiple leaves, each leaf having a first depth and movable relative to a source of radiation, thereby defining an aperture through which the radiation passes, thereby creating a first radiation beam field;
- a second multi-leaf collimator having multiple leaves, wherein at least one of the leaves extends into the aperture, each leaf having a second depth sufficient to partially block a portion of the first radiation beam field, thereby defining a second radiation beam field, wherein the second radiation beam field comprises a first subfield and a second subfield, the second subfield having lower intensity than the first subfield.
A linear accelerator system for applying radiation treatment, the system comprising:
- a linear accelerator for generating a radiation beam;
- a first multi-leaf collimator having multiple leaves, each leaf having a first depth and movable relative to the linear accelerator, thereby defining an aperture through which the radiation beam passes, thereby creating a first radiation beam field;
- a second multi-leaf collimator having multiple leaves, wherein at least one of the leaves extends into the aperture, each leaf having a second depth sufficient to partially block only a portion of the first radiation beam field, thereby defining a second radiation beam field, wherein the second radiation beam field comprises a first subfield and a second subfield, the second subfield having lower intensity than the first subfield.
A method of delivering radiation therapy, the method comprising:
- defining an aperture by adjusting the positioning of one or more leaves of a first multi-leaf collimator, wherein each leaf of the first multi-leaf collimator has a first depth sufficient to completely block radiation directed at the first multi-leaf collimator;
- extending at least one leaf of a second multi-leaf collimator into the aperture, wherein the second multi-leaf collimator comprises multiple leaves, each of sufficient depth to partially but not completely block a portion of the first radiation beam field;
- and
- administering radiation therapy through the aperture.
1 more element
Dependencies are inferred from the claim text.