Magnetic nanoparticles, such as superparamagnetic iron oxide nanoparticles (SPIONs), offer several advantages in MRI scans. They enhance the contrast of the image by altering the relaxation times of water protons in their vicinity. This capability allows for high-resolution imaging of structures and functions within the body. Additionally, magnetic nanoparticles can be functionalized with targeting ligands, enabling them to home in on specific tissues or diseases.