Evaluation of Mag@SiO2 nanoparticles as a T2 MR contrast agent is shown in the form of % signal enhancement with increasing concentration of Fe using a 3 Tesla MR scanner.

<p>Panel A shows the studies performed in phantoms for particles in suspension, while panel B shows the similar studies in PC3 human prostate cancer cells after nanoparticles uptake for 24 h. Corresponding T2-weighted MR images of different samples, showing the image darkening effect with increasing Fe concentration are also shown under each bar.