Author: Moser, F.
Paper Title Page
TUPC063 Energy Verification in Ion Beam Therapy 1141
  • F. Moser
    ATI, Wien, Austria
  • M. Benedikt, U. Dorda
    EBG MedAustron, Wr. Neustadt, Austria
  Funding: Austrian Federal Ministry for Science and Research, CERN Technology Doctoral Student Program
The adoption of synchrotrons for medical applications necessitates a comprehensive on-line verification of all beam parameters, autonomous of common beam monitors. In particular for energy verification, the required precision of down to 0.1 MeV, in absolute terms, poses a special challenge regarding the betatron-core driven 3rd order extraction mechanism which is intended to be used at MedAustron. Two different energy verification options have been studied and their limiting factors were investigated: 1) A time-of-flight measurement inside the synchrotron, limited by the orbit circumference information and measurement duration as well as extraction uncertainties. 2) A calorimeter-style system in the extraction line, limited by radiation hardness and statistical fluctuations. The paper discusses in detail the benefits and specific aspects of each method.
THPS082 Dose-homogeneity Driven Beam Delivery System Performance Requirements for MedAustron 3624
  • M. Palm, F. Moser
    CERN, Geneva, Switzerland
  • M. Benedikt, A. Fabich
    EBG MedAustron, Wr. Neustadt, Austria
  • M. Palm
    ATI, Wien, Austria
  MedAustron, the Austrian hadron therapy center is currently under construction. Irradiation will be performed using active scanning with proton or carbon ion pencil beams. Major beam delivery system contributors to dose heterogeneities during active scanning are evaluated: beam position, beam size and spot weight errors. Their individual and combined effect on the dose distribution is quantified, using semi-analytical models of lateral beam spread in the nozzle and target and depth-dose curves for protons and carbon ions. Deduced requirements on critical parts of the beam delivery system are presented. Preventive and active methods to suppress the impact of beam delivery inaccuracies are proposed.