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Errors in T2 estimation using multislice multiple-echo imaging.

A P Crawley, R M Henkelman

    Magnetic Resonance in Medicine
    |January 1, 1987
    PubMed
    Summary
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    Accurate T2 imaging is hindered by unwanted echoes at slice edges. This study demonstrates eliminating these echoes using modified slice-selection gradients, enabling precise T2 image calculation from remaining echoes.

    Area of Science:

    • Medical Imaging
    • Magnetic Resonance Imaging (MRI)

    Background:

    • Accurate T2-weighted magnetic resonance imaging (MRI) is crucial for diagnosing various medical conditions.
    • Multiple contiguous slice imaging, commonly used in MRI, faces challenges with unwanted echoes at slice edges, compromising image accuracy.
    • These artifacts are analogous to radiofrequency (RF) pulse imperfections seen in single-slice imaging.

    Purpose of the Study:

    • To address the challenge of obtaining accurate T2 images from multiple contiguous slices in MRI.
    • To investigate methods for eliminating unwanted echoes generated at slice edges during multislice imaging.
    • To present a technique for visualizing the spatial characteristics of these unwanted echoes.

    Main Methods:

    • Computer simulations were employed to model and analyze the behavior of unwanted echoes in multislice MRI sequences.

    Related Experiment Videos

  • Modifications to slice-selection gradients were proposed and simulated to defocus and eliminate these spurious echoes.
  • An experimental method was developed to visualize the slice profiles of unwanted echoes.

    • Main Results:

    • Simulations confirmed that specific additions to slice-selection gradients effectively eliminate unwanted echoes.
    • The proposed gradient modification allows for the calculation of accurate T2 images from the remaining, artifact-free echoes.
    • An experimental technique successfully displayed the slice shapes of unwanted echoes.

    Conclusions:

    • The developed method effectively suppresses unwanted echoes in multislice MRI, improving T2 image accuracy.
    • Accurate T2 image calculation is achievable by eliminating slice-edge artifacts using modified gradients.
    • The experimental visualization method aids in understanding and characterizing MRI artifacts.