CT angiography
Also written as: CTA — Computed Tomography Angiography
Contrast-enhanced CT imaging of blood vessels used to evaluate vascular anatomy and pathology in the brain and neck.
Full Definition
CT angiography (CTA) is a minimally invasive imaging technique that combines computed tomography with intravenous contrast material to visualize arterial and venous structures. In neuroradiology, CTA is essential for evaluating acute stroke, aneurysms, vascular malformations, and stenotic disease. The rapid acquisition time makes CTA particularly valuable in emergency settings, where it can quickly identify large vessel occlusions amenable to mechanical thrombectomy or detect aneurysmal hemorrhage requiring urgent neurosurgical intervention. Modern CTA protocols can provide detailed information about vessel anatomy, collateral circulation, and tissue perfusion.
Usage
Usage note: Specify anatomical coverage (head, neck, head and neck) in imaging requests and reports.
In Context
- "CT angiography revealed complete occlusion of the left M1 segment with poor collateral flow." — Stroke alert imaging
- "Head and neck CTA demonstrated a 3mm anterior communicating artery aneurysm." — Subarachnoid hemorrhage workup