<qa>  What is the goal of this study?With the help of these two advanced methods, a proof-of-concept trial is proposed on 24 healthy subjects and 24 ischemic stroke patients. Ischemic stroke patients will be scanned three times with a 3T MR scanner before day 10 post-stroke, around week 4 and 3 months, in order to extract diffusion kurtosis imaging DKI and DWS metrics and understand the dynamics of the cellular mechanisms at play in cerebral ischemia. The goal of this study is to investigate neuronal and glial metabolite diffusion changes at different time points after ischemic stroke, in both infarcted and non-infarcted hemispheres. The aim is to get non-invasively important information on the evolution of the cellular damage in this disease, and possibly distinguishing between neuronal and glial processes by measuring the metrics extracted for these two sequences, as well as on the different mechanisms leading to metabolite diffusion changes in the two brain areas, thus providing a great impact on the strategy of treatment for patients with cerebral infarction. 