What is an MRI contrast agent commonly used?

Gadolinium-based contrast agents are commonly used in MRI (Magnetic Resonance Imaging) due to their paramagnetic properties, which enhance the quality of the images produced. These agents work by shortening the relaxation times of nearby hydrogen nuclei in the body, which allows for clearer visualization of soft tissues, blood vessels, and organs during the imaging process. Gadolinium is particularly effective because it has a high magnetic susceptibility, making it ideal for creating contrast in MRI scans.

In comparison, iodine-based contrast agents are primarily used in CT (Computed Tomography) scans rather than MRI, as they are effective for enhancing images in modalities that rely on X-rays. Carbon dioxide agents may be used in certain vascular imaging but are not common for MRI. Iron oxide agents are less prevalent and are typically used for specific applications like liver imaging or enhancing visibility of certain tumors in MRI, but they are not the standard contrast agent commonly associated with MRI procedures.