duplex ultrasound
An imaging technique combining grayscale ultrasound with Doppler flow analysis to assess blood vessel structure and blood flow patterns.
Full Definition
Duplex ultrasound is a non-invasive diagnostic imaging modality that integrates conventional B-mode (brightness-mode) ultrasound with pulsed Doppler ultrasound to simultaneously visualize vessel anatomy and measure blood flow velocities. This technique is particularly valuable for evaluating carotid artery disease, peripheral arterial disease, and venous insufficiency. The term 'duplex' refers to the dual capability of structural and flow imaging, distinguishing it from simple Doppler studies that only assess flow. Editors should note that 'duplex' is not hyphenated when used as an adjective and should be distinguished from 'triplex' ultrasound, which adds color Doppler capability.
Usage
Usage note: Do not hyphenate 'duplex ultrasound' when used as a noun phrase. Capitalize 'Duplex' only when beginning a sentence.
In Context
- "Duplex ultrasound revealed 70% stenosis of the right internal carotid artery." — Vascular laboratory report
- "Lower extremity duplex ultrasound was negative for deep vein thrombosis." — Emergency medicine documentation