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Figure 2 | Radiation Oncology

Figure 2

From: 4D treatment planning for scanned ion beams

Figure 2

Schematic outline of the prototype compensation system developed at GSI. For each iso-energy slice, carbon ions are accelerated in a synchrotron to the required energy E. Laterally, the pencil beam is scanned by magnetic deflection. Lateral compensation is performed by adapting the nominal magnet settings. Longitudinal compensation has to be performed with a pair of plastic wedges mounted on linear motors because the beam energy can currently not be changed during an extraction cycle. Particle ranges are adapted by varying the thickness of the traversed plastic in the beam. (image according to [37])

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