Mount Vernon Cancer Centre

44 UK radiotherapy practice in volume delineation–data from the APPROACH trial (ISRCTN:1339049) radiotherapy quality assurance (RTQA) programme benchmark outlining case

Abstract Introduction Interobserver variation in radiotherapy contouring can affect protocol compliance and the robustness of clinical trial outcomes. The APPROACH (Analysis of Proton vs Photon Radiotherapy in Oligodendroglioma and Assessments of Cognitive Health) trial protocol...