Leaf sequencing
First Claim
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1. A radiation treatment system comprising:
- a beam source configured to generate a beam of radiation;
a beam aperture including a plurality of aperture leaves configured to shape the beam of radiation;
a gantry configured to move the beam aperture; and
a computing device configured to control the plurality of aperture leaves so as to provide a plurality of radiation fluence levels to different portions of a treatment volume while the beam aperture is in motion and travels 360 degrees or less around the treatment volume using the gantry.
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Abstract
Systems and methods of controlling the leaves of an aperture in radiation treatment are disclosed. In some embodiments, these systems and methods allow the delivery of different radiation fluences to different parts of a treatment volume in a single rotation of the aperture around the treatment volume. In some embodiments, different radiation fluences are achieved by radiating different parts of the treatment volume from opposing positions of the aperture around the treatment volume. In some embodiments, different radiation fluences are achieved by assigning different leaf pairs to radiate different parts of the treatment volume.
51 Citations
31 Claims
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1. A radiation treatment system comprising:
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a beam source configured to generate a beam of radiation; a beam aperture including a plurality of aperture leaves configured to shape the beam of radiation; a gantry configured to move the beam aperture; and a computing device configured to control the plurality of aperture leaves so as to provide a plurality of radiation fluence levels to different portions of a treatment volume while the beam aperture is in motion and travels 360 degrees or less around the treatment volume using the gantry. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of determining a configuration of a radiation treatment system, the method comprising:
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receiving a plurality of optimal fluences to be delivered to different portions of the treatment volume, the optimal fluences being configured to provide a desired three-dimensional dose distribution to the treatment volume; determining a plurality of discrete fluence levels to be delivered to the treatment volume in order to approximately reproduce the optimal fluences; and calculating leaf positions for each leaf of a beam aperture at each of a plurality of beam aperture positions in order to achieve the plurality of discrete fluence levels while the beam aperture is in motion and travels one or fewer times around an arc of rotation. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A computing system comprising:
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a fluence determination engine configured to determine a plurality of discrete fluence levels to approximate a plurality of optimal fluences; a leaf position calculator configured to calculate leaf positions for a plurality of leaves in a radiation beam aperture, the leaf positions being configured to provide the plurality of radiation fluence levels to different portions of a treatment volume while the radiation beam aperture is in motion and travels one rotation or less around the treatment volume; and a leaf controller configured to control the plurality of leaves according to the leaf positions calculated using the leaf position calculator. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31)
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Specification