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Chemical shift imaging with phase-encoding RF pulses.

J Hennig1

  • 1Radiologische Klinik, University Freiburg, Germany.

Magnetic Resonance in Medicine
|June 1, 1992
PubMed
Summary
This summary is machine-generated.

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This study introduces a new method using phase-modulated radiofrequency pulses to prevent signal contamination in chemical shift imaging. This technique enables clear proton spectroscopy of the brain, even near the skull.

Area of Science:

  • Neuroimaging
  • Magnetic Resonance Spectroscopy
  • Biophysics

Background:

  • Conventional chemical shift imaging suffers from signal contamination into adjacent voxels.
  • This issue is particularly problematic in central nervous system proton spectroscopy due to strong lipid signals from the skull obscuring brain metabolite resonances.

Purpose of the Study:

  • To overcome signal contamination in chemical shift imaging, especially in the brain.
  • To develop a method for acquiring contamination-free spectra from voxels adjacent to the skull.

Main Methods:

  • Phase encoding was performed using appropriately phase-modulated radiofrequency (RF) pulses, deviating from conventional magnetic field gradient methods.
  • The study utilized small voxel sizes (1 x 1 x 2 ml) for high-resolution imaging.

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Main Results:

  • Demonstrated the successful acquisition of contamination-free spectra from voxels directly bordering the skull.
  • Observed regional variations in N-acetyl aspartate within the cerebellum of patients with oligopontine cerebellar atrophy.

Conclusions:

  • Phase-modulated RF pulses effectively eliminate signal contamination in chemical shift imaging.
  • This advanced technique allows for detailed regional analysis of brain metabolites, aiding in the study of neurological disorders.