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Multiple-spin-echo imaging with a 2D Fourier method.

R Graumann, A Oppelt, E Stetter

    Magnetic Resonance in Medicine
    |October 1, 1986
    PubMed
    Summary
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    A new phase alternating-phase shift (PHAPS) sequence reduces artifacts in 2D Fourier imaging. This magnetic resonance imaging technique improves T2 accuracy and can reduce patient scan times.

    Area of Science:

    • Medical Imaging
    • Magnetic Resonance Imaging
    • Biophysics

    Background:

    • Standard Carr-Purcell sequences in 2D Fourier imaging often produce artifacts.
    • These artifacts, including center line and mirror distortions, stem from radiofrequency pulse imperfections.

    Purpose of the Study:

    • To introduce a novel phase alternating-phase shift (PHAPS) sequence for 2D Fourier imaging.
    • To demonstrate the PHAPS sequence's ability to eliminate artifacts and enable simultaneous multi-slice, multi-echo acquisition.
    • To validate the accuracy of quantitative T2 measurements using the PHAPS sequence.

    Main Methods:

    • Implementation of the phase alternating-phase shift (PHAPS) imaging sequence.
    • Acquisition of multiple-slice and multiple-echo data concurrently.

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  • Quantitative T2 measurements using calibrated phantoms and extrapolation to arbitrary echo times.

    • Main Results:

    • The PHAPS sequence effectively eliminates center line and mirror artifacts.
    • Quantitative T2 determinations achieved accuracy better than 10% in phantom studies.
    • Contrast-enhanced images were successfully calculated and extrapolated, including to negative echo times.

    Conclusions:

    • The PHAPS sequence offers significant improvements for T2-weighted magnetic resonance imaging.
    • Artifact reduction and enhanced T2 accuracy contribute to more reliable imaging.
    • This technique has the potential to substantially decrease magnetic resonance imaging investigation times for patients.