PO-0955 Tumor volume and ADC changes during the time course of RT on a 1.5T MR-Linac in HNC. (August 2021) - Boeke, S.; Habrich, J.; Nachbar, M.; Gani, C.; Butzer, S.; Boldt, J.; Marks, C.; Zips, D.; Nikolaou, K.; Schick, F.; Thorwarth, D.