Nowdays, the magnetic resonance imaging has been widely used in medical diagnostics. The advantage consists of the possibility to obtain high contrast among different „soft tissues“ in the body, often without using i.v. contrast. It is a noninvasive imaging method which enables examination of the human body in all of the three planes (and acqusition of more cross sections at the same time). There are relatively few contraindications for MR (implanted metallic materials,metallic object,hemodynamic instable patients..). However, during the acquisition,the appearing artifacts lower the diagnostic value of the images, and can lead to misinterpretation of the presented pathology or anathomy. In a MR context, an artifact is assumed as any image content which doesn,t correspond and doesn,t reflect the scanned object. An understanding of the sources of artifacts enables optimization of the MR imaging system performance, that can be classified as image reconstruction, system and physiologically – related sources. Image reconstruction artifacts occur because of limitations that are intrinsic to reconstruction algorithms used by a manufacturer. System – related artifacts occur due to temporary effects within one or more of the subsystems or they can be a sign of degradation of electronical components in the subsystem,and they can be compensated. Artifacts related to physiology depend on complex interactions between the subject and the MR imaging system. These artifacts can be minimized by an understanding of the basic anatomy and physiology, and by the appropriate use of specific pulse sequences. Therefore, it is important to recognize the artifacts and their causes, to compensate and minimize in order to obtain the best quality image.