In the recent past, radiation therapy with ion beams (e.g. protons or C-12 ions) has become of increasing importance. For this application, the ion beam is directed very precisely across the whole tumour volume by means of the so-called "raster scanning method". For carbon ions, this method has been developed at the Gesellschaft für Schwerionenforschung (GSI, Darmstadt) and is now used in therapy,...
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