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Double EPI sequence with 180 degrees RF pulses.

F Hennel1, A Jasinski, B Tomanek

  • 1Institute of Physics, Jagiellonian University, Krakow, Poland.

Magnetic Resonance in Medicine
|October 1, 1990
PubMed
Summary
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This study introduces a new rapid magnetic resonance imaging method using radiofrequency pulses, not gradient reversals, for faster imaging in non-uniform magnetic fields. The technique effectively images objects with short T2 relaxation times.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Pulse Sequence Design
  • Image Reconstruction

Background:

  • Gradient reversals are standard for phase-encoding in Echo Planar Imaging (EPI).
  • Low magnetic field homogeneity poses challenges for conventional EPI methods.
  • Rapid imaging techniques are crucial for reducing motion artifacts and improving patient comfort.

Purpose of the Study:

  • To develop a rapid imaging technique for low-homogeneity magnetic fields.
  • To overcome limitations of gradient-based phase-encoding in non-ideal fields.
  • To demonstrate the utility of a modified pi-pulsed EPI sequence.

Main Methods:

  • Utilized 180-degree radiofrequency (RF) pulses for phase-encoding instead of gradient reversals.
  • Designed a modified pi-pulsed EPI sequence with complementary data sampling (two shots).

Related Experiment Videos

  • Acquired phantom images to evaluate performance, particularly for short T2 properties.

    • Main Results:

    • Successfully generated phase-encoded echoes using RF pulses in a low-homogeneity field.
    • The modified pi-pulsed EPI sequence demonstrated feasibility.
    • Phantom images showed the advantage of this method for objects with short T2 values.

    Conclusions:

    • 180-degree RF pulses offer an alternative to gradient reversals for rapid imaging in low-homogeneity fields.
    • The modified pi-pulsed EPI sequence is a viable approach for imaging short T2 samples.
    • This technique has potential applications where magnetic field uniformity is compromised.