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Updated: Jan 21, 2026

Preparation and In Vitro Characterization of Dendrimer-based Contrast Agents for Magnetic Resonance Imaging
Published on: December 4, 2016
Nanophosphor-Based Contrast Agents for Spectral X-ray Imaging.
Kevin Smith1, Matthew Getzin2, Josephine J Garfield1
1Department of Chemistry, University of Massachusetts Lowell, Lowell, MA 01854, USA.
Lanthanide-based nanophosphors show promise as contrast agents for spectral X-ray imaging. Oleic acid-stabilized nanoparticles offer superior contrast for deep tissue imaging compared to iodine agents.
Area of Science:
- Materials Science
- Nanotechnology
- Medical Imaging
Background:
- Lanthanide-based nanophosphors (NPhs) are emerging as advanced materials for biomedical applications.
- Spectral X-ray imaging with photon-counting detectors offers enhanced capabilities for material differentiation.
Purpose of the Study:
- To develop lanthanide-based nanophosphors as contrast agents for spectral X-ray imaging.
- To investigate the impact of ligand exchange on computed tomography (CT) contrast and dispersibility.
Main Methods:
- Synthesis of K-edge lanthanide-based nanophosphors.
- Ligand exchange with oleic acid and poly(acrylic acid).
- Evaluation using spectral X-ray imaging and photon-counting detectors.
Main Results:
- Oleic acid-stabilized NPhs achieved 2-4x higher contrast than iodinated molecules, suitable for deep tissue imaging.
- Poly(acrylic acid)-stabilized NPhs exhibited good water dispersibility but lower contrast due to polymer density.
- Correlation established between NPh grafting density, CT numbers, and water dispersibility.
Conclusions:
- Lanthanide-based nanophosphors are effective CT contrast agents, with performance tunable via ligand modification.
- This study provides a foundation for developing next-generation CT-guided diagnostic and theranostic materials.
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