MRIs (Magnetic Resonance Imaging) and MRAs (Magnetic Resonance Angiogram) are scans that allow doctors and medical professionals to view tissues, blood vessels and other organs. MRIs and MRAs can aid in the detection of illnesses and abnormalities that cannot be identified during x-rays, such as tumors, heart disease, and organ lesions. Using an MRI scanner, it is possible to make pictures of almost all the tissue in the body. Tissue that has the least hydrogen atoms (such as bones) appears dark, while tissue that has many hydrogen atoms (such as fatty tissue) appears much brighter. The use of gadolinium based contrast agents can enhance the quality of the MRI or MRA image, making detection of medical issues easier. Unfortunately, gadolinium has been linked to the development of Nephrogenic Systemic Fibrosis (NSF) in patients with kidney disease.