The Strong MRI Relaxivity of Paramagnetic Nanoparticles

Abstract

We developed a method to synthesize paramagnetic nanoparticles of Gd@C82(OH)22+/-2. Such nanoparticles are with ordered microstructures and have strong MRI proton relaxation in vitro/vivo. Compared with commercial Gd-DTPA, a 12x MRI relaxivity of Gd@C82(OH)22+/-2 nanoparticles with ordered microstructures was achieved in vitro. The small Gd@C82(OH)22+/-2 nanoparticles, approximately 65nm, could easily escape the RES uptake in vivo; this opens the door for their clinical applications.