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ST: Fachverband Strahlen- und Medizinphysik
ST 4: Radiation monitoring and dosimetry I
ST 4.1: Hauptvortrag
Dienstag, 22. März 2022, 14:00–14:40, ST-H4
Present status and future challenges of magnetic resonance-guided radiotherapy — Christian P. Karger1 and •Sebastian Klüter2 — 1German Cancer Research Center (DKFZ), Heidelberg, Germany — 2Universitätsklinikum Heidelberg
As a special realization of image-guided radiotherapy (IgRT), magnetic resonance (MR)-guided radiotherapy (MRgRT) has been implemented clinically by integrating linear accelerators (Linacs) into MR imaging devices. These so-called MR-Linacs allow for fast imaging with superior soft-tissue contrast without extra dose prior or even during radiation treatment. The acquired images may be used to adapt the treatment plan to the actual anatomical situation and to compensate for motion by beam gating or tracking. Besides technical challenges of integrating and shielding of the two devices, dose distributions and the detector responses are changed by the magnetic field requiring modified dose calculation techniques and dosimetry protocols. Clinically, the development and validation of new workflows is challenging as adaptive treatment planning while the patient is lying on the table (online adaptive radiotherapy) requires fast and robust planning techniques as well as new methods for validating the adapted treatment plan. In addition special end-to-end tests have to be developed to quantify the overall dosimetric and geometric accuracy. The presentation gives an overview on the present status and future developments in MR-guided radiotherapy.