What is the primary role of CT angiography in evaluating suspected pulmonary embolism?

What is the primary role of CT angiography in evaluating suspected pulmonary embolism?

• A. Visualizes pulmonary arteries to identify emboli
• B. Measures chest wall masses
• C. Evaluates bone mineral density
• D. Detects interstitial lung disease

Answer: (A)

CT angiography is used because it visualizes the pulmonary arteries with contrast to reveal emboli. By opacifying the arterial tree, it shows intraluminal filling defects where a clot is obstructing flow, allowing rapid confirmation of pulmonary embolism, assessment of the clot’s location and extent, and evaluation for other chest findings. This direct visualization of arterial occlusion is why CTA is the preferred imaging test in suspected PE. Other options describe goals (like measuring chest wall masses, assessing bone density, or detecting interstitial lung disease) that CTA for PE does not specifically address.

CT angiography is used because it visualizes the pulmonary arteries with contrast to reveal emboli. By opacifying the arterial tree, it shows intraluminal filling defects where a clot is obstructing flow, allowing rapid confirmation of pulmonary embolism, assessment of the clot’s location and extent, and evaluation for other chest findings. This direct visualization of arterial occlusion is why CTA is the preferred imaging test in suspected PE. Other options describe goals (like measuring chest wall masses, assessing bone density, or detecting interstitial lung disease) that CTA for PE does not specifically address.