This book covers cutting-edge research on the use of nanoparticles for in vivo diagnostic medical imaging and therapy. It discusses a variety of nanoparticles, including quantum dots, carbon nanotubes, dendrimers, gold nanoshells, metal nanorods, micelles, liposomes, polymers, MRI iron oxide particles, and microbubbles. Examples in the book include multifunctional nanoparticles that are designed for multimodality imaging and simultaneous diagnostic and therapy (theranostic) applications.