One of the primary uses of nanotechnology in MRI is through the development of nanoparticles that serve as contrast agents. Traditional contrast agents, such as gadolinium-based compounds, can sometimes pose risks of toxicity. Nanoparticles, on the other hand, can be engineered to be biocompatible and to provide a stronger contrast. These nanoparticles improve the visibility of tissues, making abnormalities easier to detect. Common types of nanoparticles used include iron oxide and gold nanoparticles.