The stroke is the second cause of death in Croatia and the first cause of disability. It isextremely important to recognize asymptomatic person with risk factors and react properly toavoid heavy consequences. With cheap ultrasound method it is possible to show arteries andveins which supply brain and hemodynamics in real time. Advantages of neurosonologic trialsfrom other uninvasive methods are numerous. Except cheapness, they provide a better view inwalls of blood vessels morphology and improving them with hemodynamic informations.Color doppler of carotid and vertebral arteries shows informations of hemodynamic andmorphology of blood vessels which supply brain. With morphologic analysis of artery walls,at places with higher atherosclerotic risk, it is enabled to follow progression of diseasequantitatively. Along discovering anatomic variations in circulatory system, which arespecific for vertebral arteries, intima-media thickness can be meassured, plaques and theircharacterization can be discovered, flow disorder can be astimated along with a place andstage of stenosis. The stability of the plaque can be assessment by ultrasonic characteristics.Except atherosclerotic changes, other causes of stroke can be shown by ultrasound such asvasculopathy and disection and that is why neurosonological tests are considered for standarddiagnostic tests to evaluate patients with stroke. The quality of neurosonological methods andits presentation depends on education of an examinator and its experience. It is important tounderstand anatomic structures very well, basic phisical principles of flow and Doppler effectand also possibilities of a device which is used