Final answer:
Renografin is a contrast agent used in radiographic studies, especially in angiography and studies involving the vascular system and kidneys.
Step-by-step explanation:
Renografin, also known as diatrizoate meglumine and diatrizoate sodium solution, is most commonly used as a contrast agent in radiographic studies. This radiopaque contrast medium is primarily utilized in procedures involving the vascular system to improve the visibility of internal structures in angiography, such as arteries and veins, as well as in procedures that involve the kidneys for tests like intravenous urography.