Which imaging modality uses IV contrast to provide a detailed view of head and neck vessels and detects occlusion or stenosis?

Which imaging modality uses IV contrast to provide a detailed view of head and neck vessels and detects occlusion or stenosis?

• A. MR Angiography
• B. CT Angiography
• C. CT Perfusion
• D. MR Perfusion

Answer: (B)

The main idea is using IV contrast to illuminate blood vessels so you can see the actual lumen and spot narrowing or blockage. CT Angiography does this by injecting iodinated contrast into a vein and then rapidly scanning with CT to capture the arteries in the head and neck during the arterial phase. The result is detailed 3D images of the vessels, letting you pinpoint occlusions or stenoses precisely. This modality is especially good for evaluating acute stroke or vascular injuries because it directly shows where blood flow could be impeded and how severe the narrowing is. Other options either focus on tissue perfusion rather than vessel anatomy (perfusion studies) or rely on different imaging techniques that may not visualize the lumen as clearly or quickly (some MR angiography methods can be non-contrast or use gadolinium, but they don’t provide the same rapid, high-resolution arterial detail as CT angiography).

The main idea is using IV contrast to illuminate blood vessels so you can see the actual lumen and spot narrowing or blockage. CT Angiography does this by injecting iodinated contrast into a vein and then rapidly scanning with CT to capture the arteries in the head and neck during the arterial phase. The result is detailed 3D images of the vessels, letting you pinpoint occlusions or stenoses precisely.

This modality is especially good for evaluating acute stroke or vascular injuries because it directly shows where blood flow could be impeded and how severe the narrowing is. Other options either focus on tissue perfusion rather than vessel anatomy (perfusion studies) or rely on different imaging techniques that may not visualize the lumen as clearly or quickly (some MR angiography methods can be non-contrast or use gadolinium, but they don’t provide the same rapid, high-resolution arterial detail as CT angiography).