Abstract
Diagnostic imaging is essential tool for correct diagnosis of deep vein thrombosis. Ultrasonography （US） and CT venography （CTV） are the mainstay. US is noninvasive and the first choice for diagnosis of leg swelling and ruling out of deep vein thrombosis. CT pulmonary arteriography is already first choice of diagnosis of pulmonary embolism. CTV after CT pulmonary arteriography can be performed easily and quickly in emergency condition, and reasonable choice for diagnosis of deep vein thrombosis in patients with pulmonary embolism. Visualization of thrombosis of inferior vena cava and iliac veins with US is sometimes difficult, although CTV can visualize thrombosis of those areas well. US and CTV has complimentary role in diagnosis of deep vein thrombosis.
