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Related Experiment Video

Updated: Aug 30, 2025

Synthesis of 68Ga Core-doped Iron Oxide Nanoparticles for Dual Positron Emission Tomography /T1Magnetic Resonance Imaging
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Chelator-Free Copper-64-Incorporated Iron Oxide Nanoparticles for PET/MR Imaging: Improved Radiocopper Stability and

Hye Min Jang1,2, Myung Hwan Jung1, Jae Sang Lee1

  • 1Korea Multi-Purpose Accelerator Complex, Korea Atomic Energy Research Institute, 181 Mirae-ro, Gyeongju 38180, Korea.

Nanomaterials (Basel, Switzerland)
|August 26, 2022
PubMed
Summary

We created novel iron oxide nanoparticles with copper-64 for combined PET-MRI imaging. These nanoparticles show promise as stable, dual-modality contrast agents for advanced diagnostics.

Keywords:
PET-MRIcontrast agentsmagnetic relaxivitymultimodal imagingnanoparticlessilica core-shellsuperparamagnetic nanoparticles

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Radiochemistry

Background:

  • Developing dual-modality contrast agents for simultaneous Positron Emission Tomography (PET) and Magnetic Resonance Imaging (MRI) is crucial for advanced diagnostics.
  • Iron oxide nanoparticles (IO NPs) offer magnetic properties suitable for MRI, but incorporating radioactive isotopes for PET imaging requires careful design.
  • Chelator-free methods for radiolabeling nanoparticles are desirable to improve stability and reduce potential toxicity.

Purpose of the Study:

  • To develop and characterize chelator-free copper-64-incorporated iron oxide nanoparticles (IO NPs) for PET-MRI applications.
  • To evaluate the potential of these dual-property NPs as contrast agents for both PET and MRI.
  • To assess the in vivo stability of the radiolabeled core-shell structured IO NPs.

Main Methods:

  • Synthesis of core-shell structured iron oxide nanoparticles.
  • Chelator-free incorporation of the radioactive isotope copper-64 (64Cu) into the IO NP core.
  • Evaluation of magnetic properties and relaxivity (r2/r1 ratio) for MRI contrast enhancement.
  • Assessment of 64Cu retention and stability within the NPs under physiological conditions.
  • In vivo stability studies of the 64Cu-labeled IO NPs.

Main Results:

  • Successfully developed chelator-free 64Cu-incorporated IO NPs with both magnetic and radioactive properties.
  • Demonstrated that the 64Cu-labeled IO NPs function as effective PET imaging agents.
  • Showcased the NPs' capability as T2 MRI nanoprobes with a favorable r2/r1 ratio.
  • Confirmed good in vivo stability of the 64Cu incorporation within the core-shell structured IO NPs.

Conclusions:

  • Chelator-free 64Cu-labeled IO NPs represent a promising strategy for developing dual-modality PET-MRI contrast agents.
  • The developed NPs exhibit excellent stability and dual imaging capabilities, paving the way for enhanced diagnostic tools.
  • This approach offers an insightful pathway for designing advanced contrast agents for integrated PET-MRI systems.