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Related Experiment Videos

B0 mapping using rewinding trajectories (BMART).

Corey A Baron1, Dwight G Nishimura1

  • 1Department of Electrical Engineering, Magnetic Resonance Systems Research Laboratory, Stanford University, Stanford, California, USA.

Magnetic Resonance in Medicine
|August 25, 2016
PubMed
Summary
This summary is machine-generated.

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A new method called BMART (B0 mapping using rewinding trajectories) effectively corrects magnetic field off-resonance in MRI scans. This technique improves image quality without extending scan times, benefiting 2D and 3D non-Cartesian acquisitions.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Physics
  • Image Reconstruction

Background:

  • Off-resonance effects in MRI can lead to image distortions and signal loss.
  • Accurate B0 mapping is crucial for correcting these artifacts, especially in non-Cartesian imaging.
  • Existing methods for B0 mapping often require additional scan time or complex procedures.

Purpose of the Study:

  • To develop a method for creating B0 maps and correcting off-resonance effects.
  • To minimize increases in scan time for 2D and 3D non-Cartesian MRI acquisitions.
  • To enable efficient off-resonance correction in advanced MRI sequences.

Main Methods:

  • Utilized rewinding gradient trajectories to achieve zero zeroth gradient moment per TR.
  • Estimated off-resonance using a center-out 3D cones trajectory with a minimal TR increase (5%).
Keywords:
B0 mapdeblurringnon-Cartesianoff-resonance correction

Related Experiment Videos

  • Implemented an algorithm for off-resonance estimation and correction using binning and object-domain phase correction (BMART).

    • Main Results:

    • BMART demonstrated excellent agreement with traditional multiple echo time (TE) methods for B0 mapping.
    • Images corrected using BMART showed significant deblurring and artifact reduction.
    • The method proved effective in both phantom and human brain imaging.

    Conclusions:

    • BMART enables efficient B0 mapping and off-resonance correction without additional scan time.
    • The technique is readily applicable to various trajectories, including center-out and projection methods in 2D and 3D.
    • BMART offers a practical solution for improving image quality in challenging MRI acquisitions.