arterial phase
Specific timing phase during contrast-enhanced imaging when arteries show peak contrast enhancement.
Full Definition
The arterial phase refers to the optimal timing window during contrast-enhanced imaging when arterial structures demonstrate maximum contrast opacification. This phase typically occurs 15-25 seconds after intravenous contrast injection for CT angiography, though timing varies based on patient factors such as cardiac output and circulation time. During the arterial phase, arteries are maximally enhanced while veins show minimal opacification, providing optimal contrast-to-noise ratio for arterial evaluation. Proper timing of the arterial phase is critical for diagnostic quality in vascular imaging, often achieved through automated bolus tracking or timing bolus techniques.
Usage
Usage note: Specify timing in seconds when documenting imaging protocols.
In Context
- "Images were acquired during the arterial phase to optimize vessel contrast." — CT angiography protocol
- "Arterial phase imaging demonstrated the aneurysm neck anatomy clearly." — Pre-procedural planning report