Advanced Diffusion MRI to Differentiate Tumor Recurrence From Pseudoprogression in Patients With Glioblastoma and Brain Metastases

An advanced diffusion weighted MRI-sequence will be performed in addition to the routine MRI-diagnostics. This will require the patient to be scanned for additional 30 minutes in a separate MRI-scanner. This technique offers the opportunity of higher sensitivity towards subtle tissue changes associated with increased specificity relating to damage of different tissue components of the CNS. In the case of surgical resection, the histopathological findings will be correlated to the findings of the ADW-MRI.