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Three-dimensional MRI with an undersampled spherical shells trajectory.

Yunhong Shu1, Stephen J Riederer, Matt A Bernstein

  • 1Department of Radiology, Mayo Clinic College of Medicine, Rochester, Minnesota 55905, USA.

Magnetic Resonance in Medicine
|August 9, 2006
PubMed
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Shells trajectory enables faster 3D MRI acquisition by combining k-space undersampling with efficient data collection. This method achieves up to twofold acceleration with minimal artifacts, improving spatial resolution.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Imaging Technology
  • Biomedical Engineering

Background:

  • Traditional Cartesian sampling in MRI can be inefficient.
  • Shells trajectory offers improved efficiency and motion correction capabilities.
  • Accelerated MRI acquisition is crucial for reducing scan times and improving patient comfort.

Purpose of the Study:

  • To investigate the combination of shells trajectory with k-space undersampling for accelerated MRI acquisition.
  • To evaluate the impact of undersampling on image quality and artifact levels.
  • To demonstrate the potential for increased spatial resolution with this combined technique.

Main Methods:

  • Implemented k-space undersampling by removing interleaves from outer shells.

Related Experiment Videos

  • Utilized a Kaiser window with a variable shape parameter (beta) to control undersampling.
  • Examined various undersampling schemes with different beta values.
  • Conducted phantom and volunteer studies to assess performance.

    • Main Results:

    • Achieved up to twofold acceleration in MRI acquisition using shells trajectory and undersampling.
    • Introduced minor, low-energy, high-spatial-frequency artifacts due to outer k-space undersampling.
    • Demonstrated feasibility in phantom and volunteer imaging.
    • Showcased potential for enhanced spatial resolution at fixed acquisition times.

    Conclusions:

    • Combining shells trajectory with k-space undersampling is an effective strategy for accelerating MRI acquisition.
    • The proposed method allows for significant acceleration with acceptable image quality.
    • This technique can be leveraged to improve spatial resolution or reduce scan duration in 3D MRI.