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Magnetization transfer effects in multislice RARE sequences.

P S Melki1, R V Mulkern

  • 1Department of Radiology, Brigham and Women's Hospital, Boston, Massachusetts.

Magnetic Resonance in Medicine
|March 1, 1992
PubMed
Summary
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Magnetization transfer effects significantly impact brain tissue signal intensity in multislice rapid acquisition relaxation enhanced (RARE) imaging. Increasing slice number enhances gray and white matter contrast-to-noise ratios in proton density-weighted images.

Area of Science:

  • Magnetic Resonance Imaging
  • Biophysics

Background:

  • Magnetization transfer (MT) effects are crucial for understanding signal intensity in Magnetic Resonance Imaging (MRI).
  • Rapid Acquisition Relaxation Enhanced (RARE) sequences are widely used in neuroimaging.

Purpose of the Study:

  • To investigate the influence of MT effects on signal intensity in brain tissues using RARE sequences.
  • To determine the relationship between signal intensity variations and slice number (or off-resonance power deposition).

Main Methods:

  • Acquisition of multislice RARE MRI sequences in brain tissues.
  • Analysis of signal intensities in fat, gray matter, and white matter.
  • Comparison with established MT experiments in kidney tissues.

Main Results:

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  • Magnetization transfer effects were found to be significant in determining RARE signal intensities.
  • Signal intensity variations in brain tissues mirrored those observed in kidney tissues.
  • Increasing slice number led to improved contrast-to-noise ratios between gray and white matter on proton density-weighted images.

Conclusions:

  • MT effects play a critical role in RARE imaging of brain tissues.
  • RARE sequence parameters, specifically slice number, can be optimized to enhance tissue contrast.
  • Findings have clinical significance for RARE practitioners seeking to improve gray and white matter differentiation.