Fig. 3From: Mesorectal motion evaluation in rectal cancer MR-guided radiotherapy: an exploratory study to quantify treatment marginsMR scans in the axial (a), sagittal (b) and coronal (c) plans of the mesorectal structures of each treatment fraction rigidly co-registered on the planning fraction (all in brown). The PTV obtained taking into account the inter-fraction motion by applying asymmetric margins to the mesorectum in planning fraction is shown in redBack to article page