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US 2022/0304136 A1Published application
Use of magnetic elements to shape and defocus charged particle beams
AssigneeVarian Medical Systems, Inc.
InventorJoshua McNEUR
Life of this patent
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Abstract
A set of magnetic elements is used in the beamline of a charged particle-based radiation therapy machine instead of scattering foils. The set of magnetic elements is located between the exit of the linear accelerator and the isocenter or patient, and is used for shaping and defocusing a charged particle beam used for charged particle-based treatment modalities.
Claims20
A radiotherapy treatment system, comprising:
- a source of a beam of charged particles;
- a linear accelerator coupled to the source and that accelerates the charged particles in the beam;
- and
- a beam transport subsystem coupled to the linear accelerator and having an exit window, and comprising a plurality of magnetic elements located inside the beam transport subsystem between the linear accelerator and the exit window, wherein the plurality of magnetic elements is used to defocus the beam before the beam exits the beam transport subsystem.
1 more element
A radiotherapy treatment method, comprising:
- generating a beam of charged particles;
- accelerating the charged particles in the beam;
- guiding the beam inside a waveguide toward an exit window that separates the inside of the waveguide from outside air;
- and
- before the beam reaches the exit window, defocusing the beam using a plurality of magnetic elements.
2 more elements
A radiotherapy treatment method, comprising:
- generating a beam of charged particles;
- accelerating the charged particles in the beam;
- guiding the beam inside a waveguide toward an exit window that separates the inside of the waveguide from outside air;
- and
- before the beam reaches the exit window, using a plurality of magnetic elements to change a cross-sectional shape and size of the beam during treatment of a patient by varying field strengths of the plurality of magnetic elements.
2 more elements
Dependencies are inferred from the claim text.