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Related Experiment Videos

A rotational approach to localized SPAMM 1-1 tagging.

Vasiliki N Ikonomidou1, George D Sergiadis

  • 1Telecommunications Division, Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|September 27, 2002
PubMed
Summary

This study simplifies magnetic resonance tagging by canceling phase dispersion with identical selective excitation pulses. This eliminates the need for preemphasis and refocus gradients in L-SPAMM sequences.

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Area of Science:

  • Magnetic Resonance Imaging
  • Biophysics
  • Medical Physics

Background:

  • Magnetic resonance tagging methods often require precise control of transverse magnetization phase dispersion.
  • Selective excitation pulses introduce inherent phase shifts, complicating their integration with tagging sequences.
  • Existing techniques, like localized spatial modulation of magnetization (L-SPAMM), often necessitate refocusable pulses.

Purpose of the Study:

  • To investigate the impact of selective excitation pulses on L-SPAMM 1-1 sequences.
  • To explore methods for simplifying magnetic resonance tagging protocols.
  • To enable the use of constant gradients in tagging sequences.

Main Methods:

  • Analysis of selective excitation pulses within an L-SPAMM 1-1 sequence.

Related Experiment Videos

  • Mathematical examination of phase component cancellation.
  • Simulation or experimental validation of sequence modifications.

    • Main Results:

    • Identical selective excitation pulses effectively cancel the phase component in L-SPAMM 1-1 sequences.
    • Elimination of the need for preemphasis and refocus gradients.
    • Facilitation of a constant gradient application throughout the tagging sequence.
    • Possibility of employing nonrefocusable maximum and minimum phase pulses.

    Conclusions:

    • A simplified approach to magnetic resonance tagging is presented, enhancing L-SPAMM sequences.
    • The findings allow for more flexible and potentially more efficient MRI tagging protocols.
    • This method reduces sequence complexity and hardware requirements.