Which one of the following contrast agents is typically used in nonionic contrast?

The choice of iohexol (Omnipaque) as a nonionic contrast agent is based on its chemical structure and properties, which distinguish it from ionic agents. Nonionic contrast agents, such as iohexol, are designed to have lower osmolality compared to ionic agents. This difference reduces the risk of adverse reactions, such as allergic responses or discomfort during injection, making nonionic contrast agents more favorable for patient safety and comfort.

In addition, iohexol has a favorable pharmacokinetic profile, including good iodine concentration and low viscosity, which enhance imaging quality and provide clear delineation of anatomical structures during CT imaging. Nonionic agents like iohexol are also less likely to cause side effects such as vasodilation and hemodynamic alterations, which can occur with ionic contrast agents.

In summary, the utilization of iohexol as a nonionic contrast agent is based on its safety profile, ability to produce high-quality imaging, and lower adverse reaction rates, making it a commonly chosen option in clinical practice for CT scans.