 Unlike the arterial ultrasound study , when the sonographer studies venous insufficiency , the vein wall itself has no relevance and attention will be focused on the direction of blood flow . The objective of the examination is to see how the veins drain . In this way , venous ultrasonography has at times become a hemodynamic examination which is reserved for experienced sonographers who have completed hemodynamic studies and training and have acquired a deep knowledge of this subject . 
