Ultrasonography works via sound waves. During an ultrasonography, the transducer is moved across a certain part of the body. With the sounds that are measured, it is possible to make the arteries visible, but also to diagnose possible occlusions. The amount of blood that flows through a (coronary) artery per minute and the level of elasticity can be measured by means of the echo-doppler technique. As a result, not only are we able to examine the common carotid artery as safely and optimally as possible, but the other arteries (in arms and legs) will also become visible with this technique. The examination is safe and painless.