 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 ) , <unk> 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 . 
