Ultrasonography of leg veins is a risk-free, non-invasive procedure that uses ultrasound technology to give information about the anatomy, physiology and pathology of both the superficial and the deep venous systems, (SVS) and (DVS). It is indicated mainly on the study of two pathologies: venous thrombosis and venous insufficiency. As with heart ultrasound (echocardiography) studies, venous ultrasonography requires an understanding of hemodynamics in order to give useful examination reports. In chronic venous insufficiency (CVI), sonographic examination is of most benefit; in confirming varicose disease, making an assessment of the hemodynamics, and charting the progression of the disease and its response to treatment. It has become the reference standard for examining the condition and hemodynamics of the lower limb veins.