Which type of contrast material is commonly used in CT scans?

Iodinated contrast agents are the predominant choice for CT scans due to their effectiveness in enhancing the contrast of images. These agents contain iodine, which has a high atomic number and is very efficient at absorbing X-rays. When injected into the body or taken orally, iodinated contrast material creates a clear differentiation between various tissues and structures by allowing radiologists to visualize blood vessels, organs, and abnormalities more distinctly.

This enhanced visibility is especially important in diagnosing conditions such as tumors, internal bleeding, or vascular diseases. Iodinated contrast agents can be classified into ionic and non-ionic types, but the non-ionic formulations are preferred in clinical practice primarily because they tend to cause fewer allergic reactions and have lower osmolarity, which reduces the risk of adverse effects.

Other contrast materials mentioned in the choices, such as magnetic resonance agents, are specifically designed for MRI scans rather than CT, and gas contrast agents might be used for specific procedural purposes but are not standard for routine CT imaging. Non-ionic isotopes are not a standard term used in the context of CT; the relevant focus is on iodinated contrasts. Thus, iodinated contrast agents are integral to the successful practice of CT imaging.