Imaging contrast

Imaging contrast (also called contrast agent or contrast medium) is a diagnostic substance used to enhance medical imaging, not a drug target for therapeutic intervention. Contrast agents are materials that help radiologists and clinicians visualize internal body structures more clearly during imaging procedures like X-rays, CT scans, MRI, and ultrasound. They do not interact with specific biological receptors, enzymes, transporters, or other molecular targets that could be modified to treat disease. Instead, they work through physical or chemical properties (such as X-ray absorption or magnetic field interaction) rather than through specific binding to molecular targets. Common examples include iodine and barium (for X-ray imaging), gadolinium (for MRI), and microbubbles (for ultrasound).

Other names

Contrast agentContrast medium

Imaging contrast agents work through physical or chemical properties such as X-ray absorption or magnetic field interaction to enhance visualization during medical imaging procedures. They do not interact with specific biological receptors, enzymes, or transporters in a therapeutic manner.