Gadolinium is used an MRI contrast agent to enhance MRI images. This enhancement occurs on the chemical level because of its oxidation state. 

In other words, the atomic structure of gadolinium causes water around the contrast agent to settle so that the image can be enhanced. Without this enhancement, the image quality is often poorer. 

If you or anyone you know has experienced negative side effects due to gadolinium, contact the gadolinium lawyers of Williams Kherkher 800-761-3187.