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Related Experiment Videos

MRI using piecewise-linear spiral trajectory

J R Liao1, J M Pauly, N J Pelc

  • 1Department of Radiology and Electrical Engineering, Stanford, California 94305, USA.

Magnetic Resonance in Medicine
|August 1, 1997
PubMed
Summary

New magnetic resonance imaging (MRI) gradient systems enable faster scans but limit gradient slew rates. A novel piecewise-linear spiral MRI trajectory reduces the slew rate duty cycle, allowing faster imaging on these advanced systems.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Imaging Technology
  • Gradient Coil Systems

Background:

  • Advanced gradient systems in MRI offer faster imaging and shorter echo times.
  • These systems often have limitations on gradient slew rate duty cycle.
  • Traditional circular spiral trajectories are incompatible with these limitations due to 100% duty cycle requirements.

Purpose of the Study:

  • To introduce a novel piecewise-linear spiral trajectory for MRI.
  • To reduce the gradient slew rate duty cycle while preserving desirable imaging properties.
  • To enable the use of spiral trajectories on high-power gradient systems.

Main Methods:

  • Development of a piecewise-linear spiral trajectory with linear segments and rounded corners.

Related Experiment Videos

  • Implementation of a conventional gridding method for image reconstruction.
  • Creation of a new numerical algorithm for density compensation factor calculation.

    • Main Results:

    • The piecewise-linear spiral trajectory significantly reduces the slew rate duty cycle (e.g., to 46% in one example).
    • Desirable imaging properties of circular spirals, such as interleaving by gradient rotation, are maintained.
    • The developed trajectory effectively mitigates the impact of slew rate limitations.

    Conclusions:

    • Piecewise-linear spiral trajectories are a viable solution for MRI on systems with slew rate limitations.
    • This approach facilitates faster MRI acquisition and broader adoption of spiral imaging techniques.
    • The method allows for efficient imaging without compromising image quality or trajectory benefits.