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Related Experiment Videos

Asymmetric sampling along k(slice-select) in two-dimensional multislice MRI

J G Pipe1

  • 1Department of Radiology, Wayne State University, Detroit, Michigan, USA.

Magnetic Resonance in Medicine
|April 16, 1998
PubMed
Summary

Reducing the slice-select gradient in MRI creates k-space asymmetry, enabling faster scans and reduced artifacts. This technique allows for higher resolution imaging by reconstructing data with smaller slice thickness than originally collected.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Imaging Physics

Background:

  • Two-dimensional multislice imaging often uses slice-select refocusing gradients.
  • Gradient reduction can lead to k-space asymmetry along the slice-select direction.

Purpose of the Study:

  • To investigate reconstruction methods for asymmetric k-space data in MRI.
  • To explore the potential for scan time reduction and artifact mitigation.

Main Methods:

  • Applied standard partial Fourier reconstruction techniques to asymmetric k-space data.
  • Utilized reduced slice-select refocusing gradients in a two-dimensional multislice imaging sequence.
  • Evaluated performance using resolution and flow phantoms.

Main Results:

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  • Reconstruction yielded through-plane resolution smaller than the collected slice thickness.
  • The method achieved scan time reduction comparable to asymmetric sampling in the phase-encoded direction.
  • Reduced refocusing gradients decreased minimum echo time (TE) and motion artifacts.

    • Conclusions:

    • Partial Fourier reconstruction effectively handles k-space asymmetry from reduced slice-select gradients.
    • This approach offers a viable strategy for accelerating MRI scans and improving image quality.