Arterial	Venous
• Identify obstructive atherosclerotic disease:	• Diagnosis of deep vein thrombosis above the knee
Carotid	• Assessing competence of valves in deep veins
Renal	• Superficial venous reflux:
• Surveillance of infrainguinal bypass grafts	Assessing patient with recurrent varicose veins
• Surveillance of lower limb arteries after angioplasty	Identify and locate reflux at saphenopopliteal junction
	• Preoperative mapping of saphenous vein