System and method for high resolution radiation field shaping
AssigneeVarian Medical Systems, Inc.
InventorStephen Mohr
Life of this patent
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Abstract
A system and method are provided for a high resolution radiation treatment system which provide for projecting a field of radiation energy at targeted patient tissue. The system uses a multi-leaf collimator, which is positioned such that a significant clearance is provided between the multi-leaf collimator and the isocenter plane where the targeted tissue is located. The leaves of the multi-leaf collimator are designed to provide for high step resolution in the projected radiation energy shape. Additionally, an embodiment of the system and method herein can provide for a high step resolution in the projected radiation energy shape, and for a dose calculation matrix which has matrix units which coincide with the high step resolution in the projected radiation shape.
Claims1
A radiation treatment system including:
- a radiation source which emits radiation energy;
- a multi-leaf collimator positioned between the radiation source and an isocenter, such that a portion of the radiation energy from the radiation source is transmitted through the multi-leaf collimator to the isocenter;
- wherein the multi-leaf collimator includes a plurality of leaves, each leaf being movable to allow a selected portion of the radiation energy to be blocked, whereby a shape is defined by the portion of radiation energy which is incident at the isocenter, and the shape is controlled by a positioning of the plurality of leaves;
- and
- wherein the multi-leaf collimator includes a first set of leaves which provide for a first area of the shape that has a step resolution length in the range of approximately 3.0 mm or less and wherein the multi-leaf collimator is positioned such that there is a clearance in range approximately 400 mm or greater between the multi-leaf collimator and the isocenter.
Dependencies are inferred from the claim text.