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Single-shot MR imaging using trapezoidal-gradient-based Lissajous trajectories.

Hanhua Feng1, Hong Gu, David Silbersweig

  • 1Department of Psychiatry, Weill Medical College of Cornell University, New York, NY 10021, USA.

IEEE Transactions on Medical Imaging
|August 9, 2003
PubMed
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A new magnetic resonance (MR) imaging technique uses a novel Lissajous trajectory for faster, more robust image reconstruction. This method can acquire two images with different echo times in a single scan, aiding in brain activity studies.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Biophysics
  • Neuroimaging

Background:

  • Current MRI techniques face limitations in speed and robustness for certain applications.
  • Acquiring multiple contrast-weighted images often requires separate scans, increasing acquisition time.

Purpose of the Study:

  • To introduce and validate a novel single-shot trapezoidal-gradient-based Lissajous trajectory for MRI.
  • To enhance image reconstruction speed and robustness.
  • To enable simultaneous acquisition of images with different echo times for advanced applications like T2* mapping and functional MRI.

Main Methods:

  • Implementation of a novel Lissajous trajectory on a 3-tesla MRI scanner.
  • Utilizing a nonequidistant rectangular grid for sampling points.

Related Experiment Videos

  • Development and application of one-dimensional optimal algorithms for image reconstruction.
  • Investigation and mitigation of potential artifacts in reconstructed images.

    • Main Results:

    • Demonstrated increased robustness and speed in image reconstruction due to the trajectory's grid properties.
    • Successfully acquired two images with different effective echo times within a single excitation.
    • Validated the feasibility of the new sequence through experiments on normal subjects at rest and during brain activation.

    Conclusions:

    • The novel Lissajous trajectory offers significant advantages in MRI acquisition speed and reconstruction efficiency.
    • The ability to obtain dual-echo images in a single shot opens possibilities for rapid T2* mapping and enhanced functional MRI.
    • The developed artifact suppression methods ensure image quality for clinical and research applications.