Color coded duplex sonography is today the method of choice for diagnosing diseases of arteries and veins.
As an ultrasound method, this method is completely noninvasive and painless for the patient. In addition to the use of modern, high-resolution ultrasonic devices, the long-term experience of the investigator is decisive for the quality and significance of this examination.
This investigation allows an exact representation of the wall texture of arteries and veins and thus the early detection of arteriosclerotic, calcified vascular wall deposits, or blood clots and venous inflammations (Figure 1. Cross-section through the artery (upper) and vein (bottom) of the thigh.This patient with deep venous thrombosis shows a blood clot in the vein).
The color coding makes the blood flow visible (Fig. 2 longitudinal section through a normal thigh artery with color coded representation of the blood flow). Thus, narrowings and closures can be precisely located.
The derived flow spectrum (on the right in the figure) shows a strong increase in the flow velocity caused by the constriction to 400 cm / min, Sec (normally a speed of up to 100 cm / sec)), the physician can finally assess the extent of the constrictions and the blood flow disturbance caused thereby.