Commissioning Of The Treatment Planning System Raystation At The Heidelberg Ion Beam Therapy Center

The Heidelberg Ion-Beam Therapy Center (HIT) uses the Raster Scan technique for proton and carbon ions. The treatment planning system (TPS) RayStation, Raysearch Laboratories, will be integrated into the application system IONTRIS, Siemens Healthineers.As TPS commissioning for proton and carbon ions various cases of target volumes were optimized with the clinical TPS Syngo RT Planning, Siemens Healthineers, using a Pencil Beam (PB) algorithm. Dose distributions rising from simple geometries like cubic volumes in water to complex cases like anthropomorphic Rando Alderson head phantom and double-wedge phantom were recalculated in RayStation using a PB algorithm for Carbons and Monte Carlo (MC) for Protons. RayStation dose distributions were compared with syngo TPS calculations and to measurements with a 24 Pin-Point chamber array in a water phantom and for complex geometries with the 2D array Octavius1000SRS, both PTW.For Protons both TPS were comparable for simple geometries. The RayStation MC algorithm better describes the lateral spread of the proton beam passing a range modulator and an air gap of 20 cm. For complex geometries, including cases with lateral inhomogeneities or oblique entrance, the RayStation MC shows better agreement with the measurements. The carbon PB calculation is on the same level of precision as the Syngo TPS for all geometries.Still based on preliminary basis data, the RayStation dose calculation yields excellent results. We are looking forward to integrating RayStation into clinical routine and making use of its powerful tools.