CT contrast agents are substances used during computed tomography (CT) scans to enhance the visibility of internal structures in the body. These agents help differentiate between various tissues, making it easier for radiologists to identify abnormalities such as tumors, infections, or blood clots. They can be administered orally or intravenously, depending on the area being examined. The most common types of CT contrast agents are iodine-based, which absorb X-rays more effectively than surrounding tissues. This property allows for clearer images. While generally safe, some patients may experience allergic reactions or side effects, so it's important to inform healthcare providers of any known allergies.