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Magnetic Resonance Imaging01:24

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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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Fluoride doped γ-Fe2O3 nanoparticles with increased MRI relaxivity.

N E Jones1, C A Burnett, S Salamon

  • 1School of Mathematics and Physical Sciences-Chemistry, University of Hull, Cottingham Road, Hull, HU6 7RX, UK. m.g.francesconi@hull.ac.uk.

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|April 8, 2020
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This summary is machine-generated.

Fluoride-doped iron oxide nanoparticles show significantly enhanced MRI contrast agent properties. This improvement is linked to a chemically induced increase in magnetic anisotropy, boosting relaxivity for better imaging.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Biomedical Imaging

Background:

  • Iron oxide nanoparticles (IONs) are investigated for Magnetic Resonance Imaging (MRI) contrast enhancement and targeted therapeutics.
  • MRI contrast agent efficiency is determined by longitudinal (r1) and transverse (r2) relaxivities.

Purpose of the Study:

  • To investigate the effect of controlled fluoride doping and citric acid functionalization on the MRI contrast properties of gamma-iron oxide (γ-Fe2O3) nanoparticles.
  • To elucidate the relationship between magnetic properties, particularly magnetic anisotropy, and the observed relaxivity enhancements.

Main Methods:

  • Controlled fluorination of γ-Fe2O3 nanoparticles.
  • Characterization using Powder X-ray Diffraction (PXRD), Mössbauer spectroscopy, High-Resolution Electron Microscopy (HREM), and magnetometry.
  • Measurement of longitudinal (r1) and transverse (r2) relaxivities at 3 T and 11 T magnetic fields.

Main Results:

  • Fluoride-doped γ-Fe2O3 nanoparticles exhibited a 3-fold increase in r1 and a 17-fold increase in r2 at 3 T, and a ~6-fold increase in r1 and a 14-fold increase in r2 at 11 T.
  • Structural integrity (crystal structure, Fe oxidation state, particle size) was maintained post-fluorination.
  • A significant increase in the coercive field was observed, indicating enhanced magnetic anisotropy.

Conclusions:

  • Chemically induced magnetic anisotropy is the primary factor responsible for the substantial increase in relaxivity of the fluorinated γ-Fe2O3 nanoparticles.
  • These findings suggest a promising strategy for developing advanced IONs with superior MRI contrast capabilities.