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Magic angle effects in MR neurography.

Karyn E Chappell1, Matthew D Robson, Amanda Stonebridge-Foster

  • 1Department of Imaging, Hammersmith Hospital NHS Trust, London, England, UK.

AJNR. American Journal of Neuroradiology
|March 24, 2004
PubMed
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The magic angle effect significantly increases peripheral nerve signal intensity in MR neurography when nerves align at 55 degrees to the magnetic field. This orientation-dependent signal change can mimic disease, impacting diagnostic accuracy.

Area of Science:

  • Magnetic Resonance Imaging
  • Neuroimaging
  • Biophysics

Background:

  • Magic angle effects are established in imaging tendons and ligaments.
  • These effects have been largely overlooked in MR neurography.

Purpose of the Study:

  • To investigate if peripheral nerve signal intensity increases at the magic angle (55 degrees) relative to the magnetic field (B(0)).
  • To assess the impact of nerve orientation on MR neurography findings.

Main Methods:

  • Examined peripheral nerves in ten volunteers at various orientations to B(0).
  • Measured signal intensity changes and estimated T2 relaxation times.
  • Assessed two rheumatoid arthritis patients' median nerves at 0 and 55 degrees.

Main Results:

Related Experiment Videos

  • Median nerve signal intensity increased by 46-175% at 55 degrees compared to 0 degrees, with T2 increasing from 47.2 to 65.8 msec.
  • Observed orientation-dependent signal changes consistent with the magic angle effect in median, ulnar, and sciatic nerves.
  • Brachial plexus components showed higher signal intensity at ~55 degrees compared to parallel nerves.

Conclusions:

  • Peripheral nerve signal intensity in MR neurography is significantly influenced by orientation to B(0), likely due to the magic angle effect.
  • Collagen's ordered structure within nerves contributes to this phenomenon.
  • Orientation-dependent signal variations can be misinterpreted as pathology, potentially leading to diagnostic errors.