Microstructure Imaging in Stroke Patients

Patient Inclusion Criteria: * Stroke or TIA (ABCD2\>4 and/or acute Diffusion-Weighted Image (DWI) lesion). * Modified Rankin Scale \<=2. * As perceived by the investigator, have the ability to comply with all requirements of the study protocol. * Have the ability to understand and sign the Informed Consents Form. * Multidimensional Fatigue Inventory score \>= 12 on general fatigue. Patient Exclusion Criteria: * The DRCMR´s general exclusion criteria for MRI research. * Pregnancy or lactation; human chorionic gonadotropin (hCG) urine test is offered for women \< 55 years. * Major medical illness (for instance: anemia, diabetes mellitus, thyroid disorders, cardiovascular disease, electrolyte imbalance, etc.) * Treated with ritalin or modafinil. * Known uncontrolled severe malignancy. * Known drug or alcohol addiction. * Tiredness due to pharmaceutical side effects, as identified by the Investigator. * Max body weight of 130 kg. * Persons who do not wish to be informed about abnormal findings as part of the investigations. Healthy Controls Exclusion Criteria: * The DRCMR´s general exclusion criteria for MRI research. * Pregnancy or lactation; urin hCG test is offered for women \< 55 years. * Major medical illness (for instance: anemia, diabetes mellitus, thyroid disorders, cardiovascular disease, electrolyte imbalance, etc.) * Anamnestic infection (cystitis, influenza, pneumonia, etc) the last 3 weeks. * Known malignancy. * Known drug or alcohol addiction. * Tiredness due to pharmaceutical side effects. * Max body weight of 130 kg. * Persons who do not wish to be informed about abnormal findings as part of the investigations. Healthy Controls Inclusion Criteria: * Healthy * Age- and sex-matched to patient groups. * As perceived by the investigator, have the ability to comply with all requirements of the study protocol. * Have the ability to understand and sign the Informed Consents Form.