Beam delivery for carbon ion radiotherapy

Beam delivery for carbon ion radiotherapy

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Schematic view of the Rasterscan method. The target volume (=tumour) is divided into slices of equal ion beam range. For the sake of clarity the picture shows only three of them, in practice there would be from 40 to 60 slices, occasionally even more than 80. Each slice corresponds to a particular ion energy which is requested individually from the accelerator. Each slice is scanned in x-y direction by means of fast magnetic deflection - similar to a TV set. The intensity of the beam is controlled online by a set of ionization chambers together with real-time computer systems. If the requested number of particles for one point is reached the control logic switches to the next raster point.
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Last update: January 29th 2003, M.Kraemer@gsi.de, Design: Marcus Winter, M.Winter@gsi.de