Imaging ultrasound-exploration of the blood vessels and the blood flow. IMT (INTIMA MEDIA THICKNESS) means the Duplex sonographical picturing of the thickness of the arterial vascular wall, especially the inner layer (Intima), and rating the thickness of the intima media (INTIMA MEDIA THICKNESS). IMT allows a very early determination of a generalized arteriosclerosis which may lead to ischaemic attacks or even stroke or heart infarction. This method is able to supply important information for the early diagnosis of an increased risk of stroke or heart failure.