PEGylated GdF3:Fe Nanoparticles as Multimodal T1/T2-Weighted MRI and X-ray CT Imaging Contrast Agents

Contrast agents for multimodal imaging are in high demand for cancer diagnosis. To date, integration of T-1/T-2-weighted magnetic resonance imaging (MRI) and X-ray computed tomography (CT) imaging capabilities in one system to obtain an accurate diagnosis still remains challenging. In this work, biocompatible PEGylated GdF3:Fe nanoparticles (PEG-GdF3:Fe NPs) were reasonable designed and synthesized as multifunctional contrast agents for efficient T-1/T-2-weighted MRI and Xray CT multimodal imaging. Owing to the enhanced permeability and retention effect in vivo, strong T-1 contrast, evident T-2 contrast, and X-ray CT signals in a tumor lesion can be observed after intravenous injection of PEG-GdF3:Fe NPs. Therefore, PEG-GdF3:Fe NPs could be used as potential multimodal contrast agents for cancer diagnosis.