Heidelberg 2022 – scientific programme
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ST: Fachverband Strahlen- und Medizinphysik
ST 8: Radiation therapy II
ST 8.1: Talk
Thursday, March 24, 2022, 11:00–11:15, ST-H4
Development of an end-to-end verification method for Gamma Knife treatments — Irenäus Adamietz2,3, Jan Boström2,3, Moritz Budde3, •Feline Heinzelmann1, and Kevin Kröninger1 — 1TU Dortmund University, Department of Physics, Dortmund, Germany — 2University Hospital at Ruhr-Universität Bochum, Gamma Knife Zentrum, Bochum, Germany — 3Marien Hospital Herne, University Hospital at Ruhr-Universität Bochum, Clinic for Radiotherapy and Radiation Oncology, Herne, Germany
Gamma Knife is a stereotactic radiosurgery (SRS) instrument using Cobalt-60 radiation sources to treat malign and benign brain tumours and other skull base disorders. With the introduction of inverse radiation planning, which has recently been adopted in Gamma Knife treatment, dose verification is recommended for Gamma Knife radiosurgery. Such plan verification is already standard practice for other teletherapies. For plan verification in Gamma Knife therapy, a new SRS phantom based on film dosimetry and an end-to-end verification protocol has been developed and implemented. The gamma analysis is used to evaluate the conformance between the measured dose distribution and the dose distribution calculated by the radiation planning system. The focus of this lecture is on the adaptations of the standardized plan verification method to stereotaxy and the associated challenges such as the small target volumes and the high applied dose, which demand high accuracy.