Device and method for adapting the size of an ion beam spot in the domain of tumor irradiation
First Claim
1. Apparatus for adapting the size of an ion beam spot in tumour irradiation, comprising a raster scanning device composed of raster scanning magnets (20) for raster scanning the ion beam (19), characterised in that quadrupole magnets (10) determining the size of the ion beam spot are arranged directly in front of the raster scanning magnets (20), and the apparatus has two magnet power supply units (18) of the quadrupole doublet of the quadrupole magnets (10) determining the size of the ion beam spot, and a control loop (21) that provides current correction values, by comparing desired and actual values of the prevailing beam count, for two magnet power supply units (18) of the quadrupole doublet arranged directly in front of the raster scanning magnets (20), and provides a defined homogenization and/or a defined variation of the size of the beam spot during beam extraction and/or from measuring cycle to measuring cycle and/or from beam position to beam position.
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Accused Products
Abstract
The invention relates to an apparatus and to a method for adapting the size of an ion beam spot in tumour irradiation. For that purpose, the apparatus has a raster scanning device composed of raster scanning magnets (20) for raster scanning the ion beam (19). In addition, the apparatus comprises quadrupole magnets (10) determining the size of the ion beam spot, which quadrupole magnets (10) are arranged directly in front of the raster scanning magnets (20), and finally two magnet power supply units (18) for the quadrupole doublet of the quadrupole magnets (10) determining the size of the ion beam spot, the apparatus having a control loop for obtaining current correction values, by comparing desired and actual values of the prevailing dimension of the beam, for two magnet power supply units (18) of the quadrupole doublet arranged directly in front of the raster scanning magnets (20), for defined homogenization and/or for defined variation of the size of the ion beam spot.
31 Citations
17 Claims
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1. Apparatus for adapting the size of an ion beam spot in tumour irradiation, comprising
a raster scanning device composed of raster scanning magnets (20) for raster scanning the ion beam (19), characterised in that quadrupole magnets (10) determining the size of the ion beam spot are arranged directly in front of the raster scanning magnets (20), and the apparatus has two magnet power supply units (18) of the quadrupole doublet of the quadrupole magnets (10) determining the size of the ion beam spot, and a control loop (21) that provides current correction values, by comparing desired and actual values of the prevailing beam count, for two magnet power supply units (18) of the quadrupole doublet arranged directly in front of the raster scanning magnets (20), and provides a defined homogenization and/or a defined variation of the size of the beam spot during beam extraction and/or from measuring cycle to measuring cycle and/or from beam position to beam position.
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8. Method for adapting the size of an ion beam spot in tumour treatment, characterized by the method steps:
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dynamic adaptation of the size of a beam spot in real time by applying desired values for different ion beam sizes to the quadrupole magnet (10) determining the beam size between two successive accelerator cycles or within an acceleration cycle by means of adjustable frequency, obtaining current correction values, by comparing desired and actual values of the prevailing dimension of the beam, for two magnet power supply units (18) of the quadrupole doublet of the quadrupole magnets (10) determining the size of the ion beam spot, for defined homogenization and/or for defined variation of the size of the ion beam spot during beam extraction and/or from measuring cycle to measuring cycle and/or from beam position to beam position, irradiating tumour tissue (1) with a denser ion beam position raster and, at the same time, a smaller ion beam spot size in the edge region (3) than in the volume region (4) of the tumour. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification