Ethical considerations: All patients are worked up according to best clinical practice and in accordance with Danish, European and American guidelines. As study procedures are added an interview on patient experience with the radiological procedure and a follow-up MRI, which is not done in case of contraindications to MRI or at patient's request. Further data on risk factors, the stroke event and follow up is recorded. There is no known risk related to MRI in persons with no magnetic metal in the body (e.g. a pacemaker); this is excluded by the same procedures as in clinical practice. The confined space and the noise of the MRI-scanner may cause anxiety in some; this will be prevented and handled by experienced radiographers as in clinical practice. Overall, there is no expected risks to participation in the study and some chance of treatment benefit by additional follow-up MRI. The study may have considerable impact on future treatment in patients with acute stroke as it may provide clarification to which of the methods should be future primary strategy. Patient experience as well as physicians experience is included in the analyses.