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Related Experiment Videos

Increased flexibility in GRASE imaging by k space-banded phase encoding

D A Feinberg1, G Johnson, B Kiefer

  • 1Department of Radiology, New York University Medical Center, New York 10016, USA.

Magnetic Resonance in Medicine
|August 1, 1995
PubMed
Summary

A new k-banding method for Gradient and Spin Echo (GRASE) imaging reduces artifacts from T2 decay and field inhomogeneity. This technique improves T2 contrast control and facilitates asymmetric Fourier sampling for better image quality.

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Area of Science:

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

Background:

  • Gradient and Spin Echo (GRASE) is an echo train imaging technique combining gradient and RF refocusing.
  • Existing GRASE methods can suffer from artifacts due to residual phase errors and T2 decay, limiting image quality and contrast control.

Purpose of the Study:

  • To introduce a novel k-banding method for GRASE imaging.
  • To reduce artifacts caused by T2 decay and field inhomogeneity.
  • To enhance control over T2 contrast and enable asymmetric Fourier sampling.

Main Methods:

  • Developed a new GRASE imaging technique employing "k banding".
  • Encoded different time segments of the echo train with distinct spatial frequency bands in k space.

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  • Utilized computer simulations and experimental data to validate the method.

    • Main Results:

    • The k-banding method significantly reduces artifacts associated with T2 decay.
    • Achieved greater control over T2 contrast in the resulting images.
    • Demonstrated improved GRASE image quality compared to previous methods.
    • Facilitated easier implementation of asymmetric Fourier sampling.

    Conclusions:

    • The proposed k-banding technique offers substantial improvements for GRASE imaging.
    • This method addresses limitations of prior GRASE approaches, enhancing artifact reduction and contrast manipulation.
    • The findings suggest broader applicability and improved performance in MRI acquisition.