My bachelor thesis on "The importance of magnetic resonance imaging (MRI) in the insult clinical diagnostics" describes the significance of this diagnostic possibility in the emergency diagnosis of stroke. To show the differences of MRI diagnostics to CT examination is another aim of this paper. The sources for this thesis are studies from the databases PubMed and Google Scholar. MRI has some advantages, such as the non-existent exposure to radiation, the good way of presenting ischemic lesions with high contrast or even the possibility of representing the entire brain using diffusion and perfusion imaging. However, in comparison to CT examinations, the MRI also carries some disadvantages, such as the complexity of the image analysis, MRI contraindications or unstable patients. Currently, it depends on various factors if stroke patients get examined by MRI or by CT, such as the timeframe since symptom onset.