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Difference between Doppler and Duplex

What is Doppler?

Doppler ultrasonography is a medical non-invasive study of heart and blood vessels, using ultrasound with high-frequency waves.

What is Duplex?

Duplex ultrasonography is a medical non-invasive study, which combines traditional ultrasonography and Doppler ultrasonography. 
Difference between Doppler and Duplex


Let us have a deep insight into the difference between Doppler and Duplex ultrasonography. 

Difference between Doppler and Duplex :

  • Doppler provides a colour picture detecting the blood flow whereas Duplex provides a colour picture detecting the flow of blood and also two-dimensional greyscale ultrasound image of the tissues. 
  • Doppler provides information about the presence of blood flow in the studied vessels, as well as its direction, speed, and turbulence whereas Duplex provides information about the presence of blood flow in the studied vessels, as well as its direction, speed, and turbulence together with an image of the surrounding tissues. 
  • Doppler is used to diagnosing fluid in the pericardium and Duplex is used in diagnosing of an abdominal aneurysm, blood clots, arterial occlusion, venous insufficiency, varicose veins, renal vascular disease, carotid occlusive disease. 
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