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Related Experiment Videos

Reduced spatial side lobes in chemical-shift imaging.

E Adalsteinsson1, J Star-Lack, C H Meyer

  • 1Radiological Sciences Laboratory, Department of Radiology, Stanford University, Stanford, California 94305-5488, USA. elfar@lucas.stanford.edu

Magnetic Resonance in Medicine
|August 10, 1999
PubMed
Summary
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Density-weighted k-space sampling in spiral chemical-shift imaging (CSI) significantly reduces spatial side lobes. This technique optimizes data collection for improved image quality without increasing noise variance.

Area of Science:

  • Magnetic Resonance Imaging
  • Medical Physics
  • Biomedical Engineering

Background:

  • Chemical-shift imaging (CSI) is crucial for non-invasive metabolite analysis.
  • Spatial side lobes in CSI can obscure spectral data and reduce image resolution.
  • Conventional k-space sampling methods may not adequately suppress these artifacts.

Purpose of the Study:

  • To investigate the efficacy of density-weighted k-space sampling using spiral trajectories for reducing spatial side lobes in CSI.
  • To compare the performance of density-weighted spiral CSI with conventional non-weighted spiral CSI.
  • To assess the impact on noise variance and practical scan times.

Main Methods:

  • Employed density-weighted k-space sampling with spiral trajectories, adjusting data collection time based on k-space center density.

Related Experiment Videos

  • Ensured sampling density adhered to apodization functions within gradient performance and Nyquist sampling constraints.
  • Compared density-weighted acquisition against non-weighted spiral sampling in a normal volunteer using 1.5 T MRI.

    • Main Results:

    • Density-weighted spiral CSI significantly reduced spatial side lobes compared to non-weighted methods.
    • Noise variance remained comparable between density-weighted and non-weighted sampling for fixed voxel size and imaging time.
    • Achieved efficient k-space coverage suitable for practical in vivo scan times.

    Conclusions:

    • Density-weighted k-space sampling with spiral trajectories is an effective method for suppressing spatial side lobes in CSI.
    • This technique offers improved image quality in metabolite imaging without compromising noise levels.
    • Demonstrated successful application in both single slice and volumetric CSI of brain metabolites.