Coronary CT angiography (CCTA) is used for which of the following?

• A. Invasive angiography of the coronary arteries.
• B. Evaluating hepatic function.
• C. Noninvasive visualization of the coronary arteries to assess atherosclerotic disease.
• D. Measuring oxygen levels in blood.

Answer: (C)

Coronary CT angiography is a noninvasive imaging test that uses contrast-enhanced CT with ECG synchronization to visualize the coronary arteries and assess for atherosclerotic plaque and stenosis. This direct visualization of the coronary lumen and vessel walls is what makes it the best choice here, as it specifically evaluates coronary artery disease without the need for catheter-based access.

The other ideas involve different tests or measurements: invasive angiography requires inserting a catheter to image the arteries; evaluating hepatic function uses liver tests or different imaging methods; measuring oxygen levels in blood is done with blood tests or sensors, not CT angiography.