The goal of this observational study is to evaluate the role of DTI-ALPS in the diagnostic and therapeutic management of NPH The main questions it aims to answer are: * Whether the glymphatic system (GS) is actually impaired in NPH * Whether DTI-ALPS index can predict the positive response to tap test (TT) and to ventriculo-peritoneal shunt (VPS) surgery. A healthy control group of patients (HC group) matched for age with the study group, will undergo MR with DTI-ALPS study
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Comparison between study and control group
Timeframe: 4 years