Duplex sonography of the carotid artery

What is a duplex-sonography?

Duplex sonography is a non-invasive diagnostic procedure which serves for an assessment of the blood vessels. With this method, the doctor can assess, amongst other things, the course of the blood vessels, and identify constrictions, obstructions or calcium deposits (stenoses) on the vessel walls (arteries and veins), which can impair the flow of blood (arteriosclerosis). The colour-coded Doppler technology enables the flow of blood, and the flow speed to be measured, so that deposits can be detected at an early stage and treated in good time.

When is duplex sonography of the carotid artery necessary?

´Constrictions or deposits in the vessels can lead to impairment of the blood flow. An interruption in the blood flow in the carotid artery, which supplies blood to the face and brain, would be equivalent to a stroke. It is therefore extremely important to detect such stenoses early.

The condition of the carotid artery also allows conclusions to be drawn on the condition of the complete vascular system of the body, and possible calcium deposits in the coronary arteries, whose obstruction (such as by calcium deposits or thrombi) would result in a heart attack.


For the ultrasound examination, the patient lies on a bed. The doctor applies some gel to the relevant area of the body so that the sound waves can penetrate better, and then applies the ultrasonic transmitter.

The examination is carried out at our practice on an out-patient basis.


The sonography takes a few minutes.


The examination causes no radiation stress for the patient.