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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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Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
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B1 homogenization in MRI by multilayer coupled coils.

Shumin Wang1, Joseph Murphy-Boesch, Hellmut Merkle

  • 1Laboratory of Functional and Molecular Imaging, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892 USA. wangshu@ninds.nih.gov

IEEE Transactions on Medical Imaging
|April 2, 2009
PubMed
Summary

Achieving uniform B(1)(+) fields in high-field ( > 3.0 T) human magnetic resonance imaging (MRI) is difficult. Coupling surface coils to a volume coil effectively homogenizes these fields for 7.0 T proton MRI of the human head.

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Area of Science:

  • Magnetic Resonance Imaging
  • Biophysics
  • Electromagnetism

Background:

  • High-field magnetic resonance imaging (MRI) (> 3.0 T) faces challenges in B(1)(+) field transmission and homogeneity.
  • Radio-frequency wavelength effects impede uniform B(1)(+) field distribution in high-field MRI.

Purpose of the Study:

  • To investigate an approach for improving B(1)(+) field homogenization in high-field human MRI.
  • To assess the feasibility and effectiveness of coupling surface coils to a volume coil for enhanced field uniformity.

Main Methods:

  • Electromagnetic simulations were employed to model the behavior of coupled surface and volume coils.
  • The proposed method was specifically evaluated for proton magnetic resonance imaging of the human head at 7.0 T.

Main Results:

  • Electromagnetic simulations demonstrated that coupling surface coils to a volume coil is a feasible approach.
  • The method proved effective in achieving B(1)(+) field homogenization at 7.0 T.

Conclusions:

  • Coupling surface coils to a volume coil is a viable strategy for B(1)(+) field homogenization in high-field MRI.
  • This technique enhances field uniformity, crucial for high-quality proton MRI of the human head at 7.0 T.