Abstract
A scanned proton beam yields dose distributions that in most cases aresuperior to passively scattered proton beams and to other external radiationtreatment modalities. The present paper gives a description of the scanningsystem that has been developed at the Svedberg Laboratory (TSL) in Uppsala.The scanning technique and the technical design are described. The solutionwith a small pole gap of the magnets and a moveable second magnet results in avery compact scanning head, which can therefore be incorporated in a gantry ofrelatively limited size. A prototype was constructed that has been used torealize various dose distributions with a scanned beam of 180 MeV protons atTSL.
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