Impact of a contouring atlas on radiographer inter-observer variation in male pelvis radiotherapy.

Purpose/objective: To determine the impact of a MR-based contouring atlas for male pelvis radiotherapy delineation on inter-observer variation to support radiographer led real-time magnetic resonance image guided adaptive radiotherapy (MRgART).

Material/methods: Eight RTTs contoured 25 MR images in the Monaco treatment planning system (Monaco 5.40.