Systems and methods are contemplated for monitoring and analyzing the glymphatic system and brain to predict, prognose, diagnose, treat, modify or improve treatment, and track progression of neurological diseases. A first and second MRI image are taken of an extracellular space in a region of interest in a patient's brain, with one image taken while the patient is awake and the other image taken while the patient is asleep. The first and second images are compared to detect changes in the extracellular space, and the comparison is used to predict, prognose, diagnose, treat, modify or improve treatment, and track progression of neurological diseases associated with the extracellular space.
