Contrast media are pharmaceutical substances administered to patients to enhance the visibility of internal anatomical structures during medical imaging procedures. By altering the way imaging modalities interact with body tissues, contrast agents significantly improve the clarity, contrast, and diagnostic value of images obtained through techniques such as Computed Tomography (CT), X-ray imaging, angiography, and Magnetic Resonance Imaging (MRI). Their use enables healthcare professionals to accurately detect, evaluate, and monitor a wide range of medical conditions, including vascular disorders, tumors, organ abnormalities, and inflammatory diseases.

Contrast media are broadly classified based on their chemical composition and imaging application. Iodinated contrast media, commonly used in CT scans and X-ray examinations, enhance image contrast by absorbing X-rays and highlighting blood vessels and organs.