Which imaging modality visualizes the venous system using injected radiopaque dye?

• A. Venography
• B. X-ray
• C. MRI
• D. Electrocardiography

Answer: (A)

Visualizing veins by injecting a radiopaque contrast agent and taking radiographic images is venography. The injected iodinated dye opacifies the venous lumen, allowing the veins to be seen clearly on X-ray or fluoroscopic imaging. This makes it possible to assess venous anatomy, patency, and any obstructions or abnormalities.

Plain X-rays alone don’t specifically highlight the venous system unless contrast is used, and MRI relies on magnetic resonance principles (often with gadolinium contrast, not the iodinated radiopaque dye typical of venography). Electrocardiography is a recording of electrical activity, not imaging. So the method that best matches “imaging the venous system using injected radiopaque dye” is venography.