Berlin 2008 – wissenschaftliches Programm
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ST: Fachverband Strahlen- und Medizinphysik
ST 5: Heavy Ion Therapy and Related Basic Research I
ST 5.4: Vortrag
Dienstag, 26. Februar 2008, 10:15–10:30, H 2033
Fast range adaptation for radiotherapy of moving targets with scanned ion beams. — •Naved Chaudhri1, Radek Pleskac1, Nami Saito1, Christoph Bert1, Bernhard Franczak1, Alexander Schmidt1, Eike Rietzel1,2, and Dieter Schardt1 — 1GSI, Darmstadt, Germany — 2Siemens Medical Solutions, Erlangen, Germany
A 3D online motion compensation system [1] for treating moving targets in radiotherapy is currently being developed at GSI Darmstadt. The system includes both lateral and range adaptation of the scanned ion beam. The range adaptation is currently achieved by a mechanical double-wedge system mounted on a high-speed linear axis located directly proximal to the target. One problem of this solution is the large size of the wedges which limits the response time to ≈ 25 ms.
Two alternative solutions will be presented: (1) Placing the double-wedge system upstream of the scanning magnets leads to a substantial reduction of both size and time delay but requires modifications in the ion optics of the beam transport system. (2) Much faster range adaptation can be achieved without mechanical devices by deflecting the ion beam to different positions on a static wedge-shaped absorber in the beam line.
Initial studies of the wedge design and ion-optics of such a beam delivery system were performed with the simulation code MOCADI [2].
[1] C. Bert et al, Medical Physics, in print.
[2] T. Schwab, PhD Thesis, Universität Giessen, GSI Report 91–10.