Fig. 1

Representative images for lesion contouring. a–d. Images acquired in a 54-year-old man with LARC, staged as cT3N0. He underwent MRI scanning pre- and post- nCRT. a, b Delineation of ROIs on oblique-axial T2-weighted MR images pre- and post- nCRT (arrow). c, d Volume renderings of VOIs pre- and post- nCRT