Author: Haberer, Th.
Paper Title Page
MOPWA001 Development of a High Precision Integrator for Analog Signals to Measure Magnetic Fields in Realtime 661
  • E. Feldmeier, Th. Haberer
    HIT, Heidelberg, Germany
  For the Magnetic Field Control of the synchrotron at the Heidelberg Ion Therapy Centre the magnetic fields are measured with a pickup coil along the beam pipe. The induced pickup voltage, corresponding to changes in the magnetic field, has to be integrated in realtime to determine the actual field. A high precision integrator has been developed to measure fields with an accuracy of 4ppm over 10 seconds. This new integrator has a very low drift and calibrates during the measurement. It is the fastest and most accurate integrator for integrating analoge voltages in realtime.  
WEPME010 Patient-specific Intensity-modulation of a Slowly Extracted Beam at the HIT Synchrotron 2944
  • C. Schömers, E. Feldmeier, Th. Haberer, J. Naumann, R.E. Panse, A. Peters
    HIT, Heidelberg, Germany
  Since 2009 more than 1100 tumour patients have been treated at the Heidelberg Ion Therapy-Centre (HIT). The HIT synchrotron produces a library of energy, focus and intensity-variable pencil beams used to deliver dose distributions of utmost conformity to irregularly shaped target volumes. The required number of particles for each volume element of the tumour, which can vary by more than two magnitudes, is applied using the rasterscan technology. The irradiation-time and thus the patient throughput are highly sensitive to the achieved spill-structure driven by RF-Knockout extraction. Presently unfavourable fluctuations of the extracted intensity due to inhomogeneous phase space distribution of the beam are present. Recently a feedback-loop coupling the dose-defining ionisation chamber in front of the patient with the RF-Exciter was implemented allowing for the adaptation of the extracted intensity to the patient-specific treatment plan in real-time. The technical implementation and the impact on the clinical operation will be discussed.  
THXB201 Novel Techniques and Challenges in Hadron Therapy 3112
  • Th. Haberer, E. Feldmeier, M. Galonska, A. Peters, C. Schömers
    HIT, Heidelberg, Germany
  This talk should review novel techniques and challenges for beam delivery systems with various beam scanning methods (such as 3D scanning, 4D scanning and so on) to conform the beam dose to the tumor shape in proton and carbon ion therapy, as developed by PSI, GSI, HIMAC, IMP etc. Besides traditional accelerators such as cyclotrons and synchrotrons, the talk should review the technical challenges and prospects for future compact hadron therapy accelerators such as DWA, laser accelerators and so on.  
slides icon Slides THXB201 [4.934 MB]  
THPWA004 The HIT Gantry: From Commissioning to Operation 3636
  • M. Galonska, S. Brons, R. Cee, Th. Haberer, K. Höppner, J.M. Mosthaf, A. Peters, S. Scheloske, T. Winkelmann
    HIT, Heidelberg, Germany
  The patient treatment at the first 360° raster scanning heavy ion gantry of the Heidelberg Ion Therapy Facility (HIT) started in October 2012 using proton and carbon ion beams. HIT is the first dedicated proton and carbon cancer therapy facility in Europe. It uses full 3D intensity controlled raster scanning dose delivering method of pencil beams. The ion energy ranges from ~50 up to 430 MeV/u (ion penetration depths of 20 to 300 mm in water). Beams are provided by a linac-synchrotron-system to four high energy beam lines: 2 horizontal patient treatment rooms; 1 horizontal experimental cave for quality assurance, development, and research work; and the heavy ion gantry. From the first commissioning the libraries of carbon and proton pencil beams at the gantry had been offered with the whole variety of ion beam properties: 255 energy steps, 4 beam foci, 360°, and 10 intensities (106-1010/spill) regarding the central beam. This paper reflects the impact of the subsequent preclinical testing including beam size/position, and dose measurements within the irradiation field of 20x20 cm2 on the further improvement of the ion optical settings of the gantry high energy transfer line.  
THPWA005 The HIT Accelerator as Part of a Medical Product: Impacts on the Maintenance Strategy 3639
  • A. Peters, R. Cee, Th. Haberer, T. Winkelmann
    HIT, Heidelberg, Germany
  The HIT accelerator produces protons and carbon beams with a large variety of parameters: 255 different energies, four foci and ten intensity steps per ion are independently available at 5 iso-centres to be requested by the dose delivery system for tumor treatment. Thus the whole accelerator chain is part of a medical product, in case of HIT an in-house manufactured device. The overall risk and quality management has deep influences on the maintenance process. Not only the huge volume of necessary documentation reflects this impact but also the organizational process before, along and after the services at HIT. Especially, the comprehensive testing after the maintenance procedures follows sophisticated checklists (e.g. the ion source service). On the other hand, a high operational availability of the accelerator in a hospital is mandatory. To realize 8250 hours of accelerator uptime per year in case of HIT, a maintenance strategy is necessary, which interleaves the regular service of the building infrastructure, e.g. air conditioning, with the periodic maintenance of the accelerator components. In detail, this approach will be discussed along the magnets and the gantry structure.