Target motion tracking with a scanned particle beam

Medical Physics
Christoph BertEike Rietzel

Abstract

Treatment of moving targets with scanned particle beams results in local over- and under-dosage due to interplay of beam and target motion. To mitigate the impact of respiratory motion, a motion tracking system has been developed and integrated in the therapy control system at Gesellschaft für Schwerionenforschung. The system adapts pencil beam positions as well as the beam energy according to target motion to irradiate the planned position. Motion compensation performance of the tracking system was assessed by measurements with radiographic films and a 3D array of 24 ionization chambers. Measurements were performed for stationary detectors and moving detectors using the tracking system. Film measurements showed comparable homogeneity inside the target area. Relative differences of 3D dose distributions within the target volume were 1 +/- 2% with a maximum of 4%. Dose gradients and dose to surrounding areas were in good agreement. The motion tracking system successfully preserved dose distributions delivered to moving targets and maintained target conformity.

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Citations

Sep 13, 2013·Der Urologe. Ausg. A·S E Combs, J Debus
Feb 20, 2013·Radiological Physics and Technology·Shinichiro MoriAntje-Christin Knopf
Sep 15, 2012·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·N SaitoC Bert
Jul 2, 2010·Radiation Oncology·Christoph BertEike Rietzel
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Mar 17, 2010·Medical Physics·Eike Rietzel, Christoph Bert
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Jul 29, 2009·Physics in Medicine and Biology·Nami SaitoEike Rietzel
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