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BURST excitation pulses

O Heid1

  • 1Institute of Diagnostic Radiology, University of Bern, Switzerland.

Magnetic Resonance in Medicine
|November 5, 1997
PubMed
Summary

Optimizing radiofrequency (RF) pulse trains for magnetic resonance imaging requires phase modulation to achieve maximum signal yield. This study presents methods for generating nearly optimum pulse trains, enhancing signal strength in demanding NMR experiments.

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Area of Science:

  • Magnetic Resonance Spectroscopy and Imaging
  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Physical Chemistry

Background:

  • Standard radiofrequency (RF) pulse trains with constant or linear phase modulation limit average echo strength.
  • Achieving theoretical maximum signal yield (M0√N) necessitates advanced pulse train design.
  • Limited RF power and inhomogeneous magnetic fields pose challenges in certain NMR applications.

Purpose of the Study:

  • To develop a theory for optimum burst excitation using the Shinnar-LeRoux spinor formalism.
  • To introduce methods for generating RF pulse trains with nearly optimum average amplitude for arbitrary N pulses.
  • To analyze RF phase spoiling within the developed theoretical framework.

Main Methods:

  • Development of a theoretical framework based on the Shinnar-LeRoux spinor formalism.
  • Design and presentation of novel RF pulse train sequences.
  • Analysis of RF phase spoiling using the established theoretical model.

Main Results:

  • Demonstrated that constant or linear phase RF pulse trains yield a maximum average echo strength of M0/N.
  • Showcased phase modulation as essential for reaching the theoretical maximum signal yield of M0√N.
  • Presented methods for constructing pulse trains with near-optimum average amplitude for any N.

Conclusions:

  • Phase-modulated RF pulse trains are crucial for maximizing signal yield in magnetic resonance.
  • The developed theory and methods provide practical approaches for optimizing burst excitation.
  • The findings are applicable to NMR experiments requiring ultrawide spectrum hard pulses under power or field inhomogeneity constraints.

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