What is the purpose of contrast-enhanced CT angiography?

What is the purpose of contrast-enhanced CT angiography?

• A. To visualize venous return and venous thrombosis
• B. To visualize arterial lumen and detect vascular stenosis or occlusion
• C. To measure bone mineral density
• D. To characterize soft tissue tumors only

Answer: (B)

Contrast-enhanced CT angiography is designed to opacify the arterial system so you can clearly visualize the arterial lumen. The iodinated contrast injected rapidly highlights arteries during the arterial phase, making them bright against surrounding tissues and enabling detailed assessment of the vessels. This allows you to detect arterial stenosis or occlusion, as well as related conditions like aneurysms or dissections, which are crucial for diagnosis and planning any intervention. While CTA can show how soft tissues relate to vessels and may reveal vascular involvement in masses, its primary purpose is arterial imaging, not measuring bone density or exclusively characterizing tumors. If venous assessment is the goal, a CT venography protocol or another modality would be used.

Contrast-enhanced CT angiography is designed to opacify the arterial system so you can clearly visualize the arterial lumen. The iodinated contrast injected rapidly highlights arteries during the arterial phase, making them bright against surrounding tissues and enabling detailed assessment of the vessels. This allows you to detect arterial stenosis or occlusion, as well as related conditions like aneurysms or dissections, which are crucial for diagnosis and planning any intervention. While CTA can show how soft tissues relate to vessels and may reveal vascular involvement in masses, its primary purpose is arterial imaging, not measuring bone density or exclusively characterizing tumors. If venous assessment is the goal, a CT venography protocol or another modality would be used.