Which radiographic technique visualizes injected radiopaque dye in veins and is used to identify tumors or blockages in the venous network?

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

Answer: (D)

Imaging the venous system by injecting a contrast agent to visualize the veins and assess patency or abnormalities is what this item targets. Venography uses radiopaque dye injected into a vein, then X-ray or fluoroscopic imaging traces the dye as it travels through the venous network. This makes the veins line up clearly on the image, allowing you to spot blockages, abnormal masses, or tumors that involve or compress the veins. Because it directly delineates the venous anatomy with the contrast outlining the vessels, it’s the classic technique for evaluating venous patency and detecting intravascular tumors or obstructions. Plain X-ray doesn’t specifically visualize veins without contrast. MRI can image veins but uses magnetic contrast and different imaging principles, not the radiographic venography technique described. Electrocardiography measures electrical activity, not imaging.