Device and method for adapting the size of an ion beam spot in the domain of tumor irradiation

摘要

Device comprises a raster-scanning unit comprised of raster scanning magnets for raster scanning the ion beam. In addition quadrupole magnets are arranged in front of the raster scanning magnets to determine the size of the ion beam spot. Two magnetic power supply units supply the quadrupole magnet pairs. A closed loop obtains current correction values for the two magnetic power units, by comparing set and actual values of the current beam dispersion, which provides defined homogenization or variation of the ion beam spot size. An independent claim is made for a method for matching beam spot size to tumor size in ion-beam radiation therapy.