PO-0894: Comparing the spatial integrity of 7 T and 3 T MR images for image-guided radiotherapy of brain tumors. - Peerlings, J.; Compter, I.; Janssen, F.M.; Wiggins, C.J.; Mottaghy, F.M.; Lambin, P.; Hoffmann, A.L. (Radiotherapy & Oncology, 2017)