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Magnetic Resonance Imaging

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...

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Summary

Gadolinium (Gd(III))-labeled AaLS-13 and OP cages significantly enhance magnetic resonance (MR) imaging contrast. These novel nanoparticles exhibit improved relaxivity, making them promising for advanced theranostic applications.

Keywords:

NMRD gadolinium magnetic resonance imaging magnetism nonviral protein cages

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Area of Science:

Biomedical Engineering
Materials Science
Radiology

Background:

Diagnostic medical imaging relies on magnetic resonance (MR) for anatomical, functional, and molecular insights.
Gadolinium (Gd(III)) complexes are crucial for amplifying MR signal in contrast agents (CAs), enhancing proton relaxation efficiency (relaxivity, r1).

Purpose of the Study:

To evaluate the magnetic resonance (MR) performance of two unique Gd(III)-labeled cages, AaLS-13 and OP.
To explore the potential of these Gd(III)-labeled cages as platforms for theranostic applications.

Main Methods:

Synthesis and characterization of Gd(III)-labeled AaLS-13 and OP cages.
Measurement of proton relaxivity (r1) at 1.4 T.
Serum phantom imaging to assess contrast enhancement.
Proton nuclear magnetic relaxation dispersion (1H NMRD) profiling and best-fit analyses.

Main Results:

Gd(III)-labeled cages demonstrated significantly enhanced proton relaxivity (r1 = 11-18 mM−1 s−1) compared to Gd(III) alone (r1 = 4 mM−1 s−1).
Serum phantom images showed substantial contrast enhancements: 107% for Gd(III)-AaLS-13 and 57% for Gd(III)-OP.
Proton nuclear magnetic relaxation dispersion (1H NMRD) profiles indicated maximum relaxivity values of 50 mM−1 s−1.

Conclusions:

The high relaxivity of Gd(III)-labeled cages is attributed to slow molecular tumbling and restricted local motion of the Gd(III) complex.
The structural characteristics and enhanced MR performance position AaLS-13 and OP cages as promising candidates for theranostic platform development.