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Polyacrylic acid (PAA)-coated lanthanide oxide (Ln 2 O 3 ) nanoparticles (NPs) (Ln = Tb and Ho) with high colloidal stability and good biocompatibility were synthesized, characterized, and investigated as a new class of negative (T 2 ) magnetic resonance imaging (MRI) contrast agents at high MR fields. Their r 2 values were appreciable at a 3.0 T MR field and higher at a 9.4 T MR field, whereas their r 1 values were negligible at all MR fields, indicating their exclusive induction of T 2 relaxations with negligible induction of T 1 relaxations. Their effectiveness as T 2 MRI contrast agents at high MR fields was confirmed from strong negative contrast enhancements in in vivo T 2 MR images at a 9.4 T MR field after intravenous administration into mice tails.

Synthesis, Characterizations, and 9.4 Tesla T2 MR Images of Polyacrylic Acid-Coated Terbium(III) and Holmium(III) Oxide Nanoparticles