Positron emission tomography imaging using radiolabeled inorganic nanomaterials

Area of Science:

• Nanotechnology
• Radiochemistry
• Molecular Imaging

Background:

• Positron emission tomography (PET) is a crucial radionuclide imaging technique in research.
• Nanoparticles offer a versatile platform for molecular imaging probes, combining imaging, targeting, and therapeutic capabilities.
• Developing effective radiolabeled nanoparticles requires careful consideration of nanoparticle properties and radioisotope selection.

Purpose of the Study:

• To introduce and categorize radiolabeled nanoparticle platforms for molecular imaging.
• To discuss general rules for selecting isotopes and adjusting labeling strategies for specific applications.
• To highlight the importance of stability assessment and understanding in vivo behavior for clinical translation.

Main Methods:

• Categorization of radiolabeling methods into four types: complexation with chelators, direct bombardment, synthesis with radioactive precursors, and chelator-free postsynthetic labeling.
• Evaluation of the advantages and limitations of each radiolabeling method regarding applicability, stability, and potential nanomaterial damage.
• Assessment of colloidal and radiochemical stability of the resulting radiolabeled nanoparticles.

Main Results:

• Complexation with chelators is broadly applicable but may alter properties and risk detachment.
• Direct bombardment and precursor synthesis offer improved stability but have limitations.
• Chelator-free methods are promising but less explored.
• PET imaging is vital for monitoring in vivo fate and guiding nanoplatform design.

Conclusions:

• Radiolabeled nanoparticles represent a promising frontier in molecular imaging, but robust labeling strategies and stability assessments are critical.
• Understanding the in vivo behavior of nanomaterials is essential for successful clinical translation.
• Multimodal imaging design considerations can enhance nanoparticle efficacy and circulation time.