Carotid duplex ultrasound
![Creutzfeldt-Jakob disease](/TransAdam/doc/graphics/images/en/24472.jpg)
Carotid duplex ultrasound
This duplex Doppler sonogram shows an irregular plaque in the carotid artery. This type of plaque can cause clots to form, which can cause a stroke. Doppler studies are used to help identify these types of plaques ahead of time to prevent a stroke from happening.
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