Name a common non-ionic contrast agent used in CT imaging.

Iohexol is a commonly used non-ionic contrast agent in CT imaging. It belongs to a class of contrast media that is designed to reduce the incidence of adverse effects, such as allergic reactions, compared to ionic contrast agents. Non-ionic contrast agents like Iohexol have lower osmolality, which can enhance patient safety and comfort during imaging procedures.

In the context of CT imaging, contrast agents are critical for enhancing the visibility of structures within the body, enabling clearer differentiation between normal and pathological tissues. Iohexol is particularly favored due to its excellent radiopacity, allowing for enhanced visualization of vascular structures and organs.

Other options mentioned do not fit the criteria of a common non-ionic contrast agent used in CT imaging. Barium sulfate is primarily used for gastrointestinal studies rather than CT scans. Iodine is a general term for an element used in various contrast agents, including both ionic and non-ionic types. Gadolinium is primarily used in MRI and is not commonly associated with CT imaging. Therefore, Iohexol stands out as the appropriate choice in this context.