Gradient system characterization of a 1.5 T MR‐Linac with application to 4D UTE imaging for adaptive MR‐guided radiotherapy of lung cancer. - Goodburn, Rosie; Bruijnen, Tom; Lecoeur, Bastien; Nair, Prashant; Ahmed, Merina; Barnes, Helen; Oelfke, Uwe; Wetscherek, Andreas (Magnetic Resonance in Medicine, 2025)