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Related Experiment Videos

Adiabatic slice-selective excitation for surface coils

J Shen1, D L Rothman

  • 1Department of Molecular Biophysics and Biochemistry, Yale University School of Medicine, New Haven, Connecticut 06510, USA.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|January 1, 1997
PubMed
Summary
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A new radiofrequency (RF) pulse, ASSESS, enables precise slice selection for surface coils by modulating magnetic field gradients and RF frequency. This method overcomes B1 inhomogeneity, offering improved localization techniques in MRI.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Pulse Sequence Design
  • Radiofrequency Engineering

Background:

  • Surface coils in MRI are prone to B1 inhomogeneity, complicating slice selection.
  • Existing methods struggle to achieve precise excitation and suppression with surface coils.

Purpose of the Study:

  • To introduce a novel RF pulse sequence, ASSESS, for robust slice-selective excitation using surface coils.
  • To address challenges posed by B1 inhomogeneity in MRI.

Main Methods:

  • Developed a novel RF pulse (ASSESS) combining Bzero gradient modulation with RF frequency modulation.
  • Employed BIR4 pulse principles for pure-phase, self-refocused spin rotation within the slice.
  • Utilized B1 field effects for outer-volume suppression outside the slice.

Related Experiment Videos

  • Performed quaternion analysis and Bloch equation simulations.
  • Conducted experimental validation on a phantom sample.

    • Main Results:

    • The ASSESS pulse achieves well-defined, pure-phase excitation within the selected slice, even with high B1 inhomogeneity.
    • Effective slice selection and outer-volume suppression were demonstrated.
    • Simulations and phantom experiments confirmed the pulse's efficacy.

    Conclusions:

    • The ASSESS pulse sequence offers a robust solution for slice selection with surface coils in MRI.
    • This technique is expected to enhance various MRI localization methods.
    • The proposed method effectively mitigates B1 inhomogeneity issues.