X-ray Absorption (Iodine-Based)

Iodine-based x-ray absorption is a physical process used in medical imaging to enhance image contrast. It relies on the high atomic number of iodine, which causes it to strongly absorb x-rays through the photoelectric effect. Iodinated contrast agents are administered to patients to increase the visibility of blood vessels, organs, and abnormal tissues during x-ray and CT scans. The effectiveness of iodine is due to its K-edge energy, which aligns with the diagnostic x-ray energy range, leading to a significant increase in x-ray absorption. While effective for enhancing images, the presence of iodine also increases local radiation dose, and potential risks such as allergic reactions and nephrotoxicity must be considered.

Photoelectric absorption of x-rays by iodine atoms