X-ray attenuation via iodine-based radiopacity

Iodine-based radiopacity refers to the use of iodine-containing compounds as contrast agents in x-ray imaging to enhance the contrast between different tissues or structures by increasing x-ray attenuation in regions where they accumulate. Iodine's high atomic number (Z = 53) and k-edge energy (~33.2 keV) result in strong photoelectric absorption of x-rays, particularly at diagnostic radiology energies. While it provides high differential tissue contrast, its efficiency decreases at higher tube voltages compared to heavier elements. Safety concerns include hypersensitivity reactions and nephrotoxicity.

Other names

Iodinated contrast agentsIodine contrast mediaRadiopaque contrast agentsIodine-based contrast enhancement

Photoelectric absorption enhanced by high-Z element (iodine); maximal near k-edge