Fig. 2From: Online adaptive magnetic resonance guided radiotherapy for pancreatic cancer: state of the art, pearls and pitfallsIntra-fraction motion management by means of cine MR. The treatment is delivered only when the target structure (in red) is inside the defined boundary region (in yellow), as described in part (a). In the case of part (b), treatment delivery stops until the right volume position is reachedBack to article page