Leaf sequencing algorithm for moving targets
First Claim
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1. A method of providing intensity modulated radiation therapy to a target using a multileaf collimator (MLC), wherein the target comprises a region that moves periodically along a trajectory, comprising:
- determining the trajectory of the moving target region;
determining a line segment that at least approximately matches said trajectory;
orienting the MLC such that all of the leaves of the MLC are perpendicular to said line segment;
delivering therapeutic radiation through an aperture in said MLC, wherein each of said aperture and said target are in a first position; and
delivering therapeutic radiation through an aperture in said MLC, wherein each of said aperture and said target are in a second position.
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Abstract
A method of providing intensity modulated radiation therapy to a moving target is disclosed. The target moves periodically along a trajectory that is projected onto a multi-leaf collimator (MLC) plane. The MLC plane is divided into thin slices parallel to the movement of the target. The present invention optimizes the leaf sequence such that, within each slice, if a point receives radiation, all other points in that slice that receive the same amount or more fluence are also receiving radiation at the same time.
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Citations
20 Claims
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1. A method of providing intensity modulated radiation therapy to a target using a multileaf collimator (MLC), wherein the target comprises a region that moves periodically along a trajectory, comprising:
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determining the trajectory of the moving target region; determining a line segment that at least approximately matches said trajectory; orienting the MLC such that all of the leaves of the MLC are perpendicular to said line segment; delivering therapeutic radiation through an aperture in said MLC, wherein each of said aperture and said target are in a first position; and delivering therapeutic radiation through an aperture in said MLC, wherein each of said aperture and said target are in a second position. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An intensity modulated radiation therapy system for providing radiation therapy to a target, wherein the target comprises at least one region that moves periodically along a trajectory, comprising:
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a beam generator for creating a radiotherapy beam for irradiating the moving target region; a multi-leaf collimator positioned between said beam generator and said moving target region for controlling the shape and position of the beam; a control system having a computer-readable medium encoded with an algorithm including the steps of; projecting the trajectory of the moving target region onto a multi-leaf collimator plane;
dividing the multi-leaf collimator plane into a plurality of thin slices substantially parallel to the movement of the target region; andgenerating a leaf sequence such that each point in a slice that receives the same fluence receives radiation at the same time. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of providing intensity modulated radiation therapy to a treatment volume using a multileaf collimator (MLC), wherein the treatment volume comprises a region that moves periodically along a trajectory, comprising:
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defining a line segment that corresponds to said trajectory; delivering radiation through a first elongate aperture in said MLC, when said aperture is in a first position; and delivering radiation through a second elongate aperture in said MLC, when said aperture is in a second position; wherein said first and second elongate apertures define first and second elongate axes that are offset from said line segment by first and second angles, and wherein said first and second elongate apertures are determined such that said first and second angles are minimized. - View Dependent Claims (18, 19, 20)
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Specification