What is the purpose of using multiple views during coronary angiography?

• A. To assess stenoses from different angles and improve localization
• B. To reduce contrast dosage
• C. To shorten procedure time
• D. To create unnecessary image overlap

Answer: (A)

Using multiple views lets you see the coronary arteries from different angles, which is essential because a single projection can misrepresent a stenosis due to foreshortening or overlap with other vessels. By imaging from several directions, you can accurately assess the degree and exact location of narrowing, distinguish whether a lesion really exists in a given segment or at an ostium, and precisely localize it within the coronary tree. This improves diagnostic accuracy and helps guide treatment decisions, such as where a stent is needed and how to size it. The other options don’t fit the main purpose—changing views isn’t primarily to reduce contrast or shorten the procedure, and creating image overlap is something to avoid.