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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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Ultra-high-field RF coil development for evaluating upper extremity imaging applications.

Shailesh B Raval1,2, Tiejun Zhao3, Narayanan Krishnamurthy1

  • 1Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.

NMR in Biomedicine
|November 4, 2016
PubMed
Summary

A new 7 Tesla (7T) MRI coil was developed for enhanced upper extremity imaging. This ultra-high-field MRI shows improved detail in wrist and hand anatomy, aiding diagnosis of various pathologies.

Keywords:
3  T7  TRF coilSARdiffusion (nerve) imagingmusculoskeletalnon-contrast-enhanced angiography

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Biomedical Engineering
  • Radiology

Background:

  • Ultra-high-field MRI (7 Tesla) offers potential for superior anatomical detail.
  • Existing MRI technology may have limitations in visualizing intricate upper extremity structures.

Purpose of the Study:

  • To develop and evaluate a custom 7 Tesla MRI coil for upper extremity imaging.
  • To assess the performance of this coil for high-resolution imaging of wrist and hand anatomy.

Main Methods:

  • Design and construction of a transverse electromagnetic transmit coil and an eight-channel receive-only array for 7T.
  • Characterization using scattering parameters and B1+ mapping.
  • Finite difference time domain simulations for field distribution and specific absorption rate.
  • Acquisition and comparison of 7T and 3T MRI images of the upper extremity.

Main Results:

  • The custom 7T MRI coil demonstrated very good B1+ field homogeneity across the forearm.
  • High-resolution 7T images revealed intricate details of musculotendinous, osseocartilaginous, and neurovascular structures.
  • Comparison showed enhanced visualization of synovial, fibrocartilaginous, and vascular anatomy at 7T compared to 3T.

Conclusions:

  • The developed 7T MRI coil is effective for high-resolution upper extremity imaging.
  • Ultra-high-field MRI at 7T significantly improves sensitivity and specificity for diagnosing wrist and hand pathologies.
  • This technology holds promise for detailed evaluation of bone, ligament, nerve, and vascular structures.