MRI uses a contrast agent.

• A. True
• B. False
• C. Sometimes
• D. Not specified

Answer: (A)

The main idea is that MRI often uses a contrast agent to make certain tissues stand out more clearly. Contrast agents, usually gadolinium-based, are injected and change how water protons relax in different tissues. This makes abnormalities—like tumors, inflammation, infections, or areas with abnormal blood flow—appear more distinctly on the images, especially on T1-weighted sequences after contrast. In many MRI protocols, adding contrast greatly improves lesion detection and characterization, helps outline vascular structures, and can show disruption of the blood-brain barrier or increased vascularity. Of course, some MRI exams are done without contrast when it isn’t needed or when a patient can’t receive contrast, but in many scenarios the contrast agent is used to enhance diagnostic accuracy.