München 2009 – scientific programme

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ST: Fachverband Strahlen- und Medizinphysik

ST 6: Ion Radiation Therapy 1: Radiation fields and effects

ST 6.2: Talk

Wednesday, March 11, 2009, 14:30–14:50, A021

Multiple scattering in TRiP — •Gheorghe Iancu, Michael Kraemer, and Dieter Schardt — GSI Helmholtzzentrum für Schwerionenforschung

One of the main goals of any therapy treatment planning is the delivery of a conformal dose distribution in the target tissue while sparing the near seated critical ones. The multiple scattering is one of the important aspects that play a role in the modelling of the beam parameters especially for deep seated tumours. For calculating the multiple scattering the Moliere[3] formula, with Fano improvement for scattering by atomic electrons, is used. This is known to give good agreement within 4% with measured data [Gottschalk]. The nuclear part of scattered angle is calculated using the modified formula of Goldhaber [Goldhaber], [Morrisey] which, for some projectile and target combinations, underestimates the data by a factor of 2 [Heinrich et all, *]. Recent measurements [Schardt] of angular distribution of incident C ions on water are used to calibrate for the uncertain factor in Morrisey theory. The calculated results are compared with measurements of water phantom experiments performed in therapy conditions.