Fast Range Adaptation for Heavy-Ion Therapy of Moving Organs
نویسندگان
چکیده
At GSI we are presently developing an alternative method for a very fast (in order of few ms) range adaptation for radiotherapy of moving organs [1] with scanned ion beams to the existing 3D online motion compensation (3DOMC) [2] system. The range adaptation can be achieved by deflecting the ion beam (with the energy E0, see Fig.1) to different positions on a static wedge-shaped energy degrader (corresponding energies E1 and E2) in the beam line. Before the beam is delivered to a required point of the moving organ (target) it is first collimated by slits and than deflected by scanning magnets [3]. The entire energy degrader system will consist of one or several degraders mounted on a frame and a step motor which is placing the frame into the beam line.
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