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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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Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
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Magic angle effect on diffusion tensor imaging in ligament and brain.

Nian Wang1, Qiuting Wen2, Surendra Maharjan2

  • 1Department of Radiology and Imaging Sciences, Indiana University, Indianapolis, IN, USA; Indiana Center for Musculoskeletal Health, Indiana University, Indianapolis, IN, USA; Stark Neurosciences Research Institute, Indiana University, Indianapolis, IN, USA.

Magnetic Resonance Imaging
|July 1, 2022
PubMed
Summary
This summary is machine-generated.

The magic angle effect significantly impacts diffusion tensor imaging (DTI) in collagen-rich tissues like ligaments, causing variations in fractional anisotropy (FA) and mean diffusivity (MD). Mouse brains showed minimal orientation dependence in DTI metrics.

Keywords:
DTIDipolar interactionLigamentMRIMagic angle effect

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Area of Science:

  • Biomedical Imaging
  • Magnetic Resonance Imaging
  • Materials Science

Background:

  • Diffusion Tensor Imaging (DTI) is a powerful MRI technique for characterizing tissue microstructure.
  • The magic angle effect, a phenomenon observed in anisotropic materials, can influence MRI signal intensity and quantitative measurements.
  • Understanding orientation-dependent effects is crucial for accurate DTI interpretation in biological tissues.

Purpose of the Study:

  • To evaluate the influence of the magic angle effect on DTI measurements in rat ligaments and mouse brains.
  • To quantify the orientation dependence of DTI metrics in highly ordered collagenous tissues.
  • To compare DTI metric sensitivity to orientation effects between ligament and brain tissues.

Main Methods:

  • High-resolution 3D DTI scans were performed on rat knee joints and mouse brains at 9.4T.
  • A modified diffusion-weighted spin echo pulse sequence was employed with specific b-values for each sample.
  • DTI models were used to analyze quantitative metrics at varying orientations relative to the main magnetic field; ligament collagen structure was validated using polarized light microscopy (PLM).

Main Results:

  • DTI metrics in rat ligaments exhibited strong dependence on collagen fiber orientation relative to the magnetic field, with fractional anisotropy (FA) varying by ~32% and mean diffusivity (MD) by ~11%.
  • Numerical simulations corroborated these findings, demonstrating significant orientation effects across a range of signal-to-noise ratios (SNRs).
  • In contrast, DTI metrics in mouse brains showed minimal dependence on tissue orientation.

Conclusions:

  • The magic angle effect significantly influences DTI measurements in collagen-rich tissues due to their high degree of structural order.
  • Fractional anisotropy (FA) is more susceptible to orientation-dependent variations than mean diffusivity (MD) in these tissues.
  • These findings highlight the importance of considering the magic angle effect for accurate DTI analysis in specific biological tissues, particularly ligaments.