Deep Vein Ultrasound (Doppler)

Comparing to other diagnostic imaging, ultrasound can effectively assess deep veins of the limbs.
Deep vein thrombosis is a condition seen in bed-bound patients, and can be caused by prolonged sitting ("economy class syndrome"). Together with doppler technique, ultrasound can detect deep vein thrombosis of the legs, allowing prompt treatment to avoid serious or even possibly life-threatening complications.
Ultrasound scan can also check for other common cause of leg swelling, including skin infection (cellulitis), general edema, and Baker's cyst, etc..