Marielle Philippens is associate professor in medical physics and has been employed at the department of Radiotherapy at the UMC Utrecht since 2008. The common theme in her career is magnetic resonance. Her main area of clinical and research activities is MR imaging for image guided radiotherapy. This includes the improvement of target delineation using pathological validation of imaging, prediction of treatment outcome and assessment of normal tissue effects using MR techniques. Her focus is on head and neck cancer, rectal cancer and brain tumors. She is project leader of KWF grants in head and neck, diffusion weighted MRI and vascular effects in brain. Special interest is in diffusion weighted imaging for target delineation and response monitoring and quality assurance for MRI in radiotherapy. She is involved in the MR linac project as MR physicist. She is course director of several basic and advanced MRI in radiotherapy courses for radiation oncologists, physicists and RTTs. She graduated in Molecular Sciences at Wageningen University and Medicine at the Radboud University Nijmegen. She obtained her PhD on MRI and NTCP modelling in radiotherapy at the medical faculty of the Radboud University and her registration as medical physicist at the department radiation Oncology at the Radboud University.