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Related Experiment Videos

Slice profile effects on nCPMG SS-FSE.

Eric K Gibbons1,2, Patrick Le Roux3, John M Pauly2

  • 1Department of Bioengineering, Stanford University, Stanford, California, USA.

Magnetic Resonance in Medicine
|April 4, 2017
PubMed
Summary

Optimizing radiofrequency (RF) refocusing pulses in non-Carr-Purcell-Meiboom-Gill (nCPMG) single-shot fast spin echo (SS-FSE) imaging enhances signal stability. Delay-insensitive variable rate excitation Shinnar-Le Roux (DV-SLR) pulses improve magnetic resonance imaging (MRI) robustness.

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Area of Science:

  • Magnetic Resonance Imaging
  • Pulse Sequence Design
  • Radiofrequency Engineering

Background:

  • Single-shot fast spin echo (SS-FSE) sequences are crucial for rapid MRI acquisition.
  • The non-Carr-Purcell-Meiboom-Gill (nCPMG) variant requires stable transverse signals throughout the echo train for accurate imaging.
  • Traditional SS-FSE refocusing pulses often lack selectivity due to their short duration, impacting signal quality.

Purpose of the Study:

  • To evaluate the impact of radiofrequency (RF) refocusing pulse profiles on transverse signal smoothness in nCPMG SS-FSE.
  • To develop an improved RF refocusing pulse for enhanced signal stability in SS-FSE sequences.
  • To compare the performance of novel delay-insensitive variable rate excitation Shinnar-Le Roux (DV-SLR) pulses against conventional pulses.

Main Methods:

Keywords:
RF pulseSS-FSEnCPMG

Related Experiment Videos

  • Simulations were performed to model RF pulse behavior.
  • Phantom studies were conducted to assess signal characteristics.
  • In vivo imaging was carried out to validate performance in a biological system.
  • nCPMG SS-FSE sequences incorporating DV-SLR and traditional low time-bandwidth pulses were implemented and compared.

Main Results:

  • DV-SLR pulses demonstrated superior signal stability across simulations, phantoms, and in vivo experiments.
  • The improved pulses maintained short echo spacing without significantly increasing specific absorption rate (SAR).
  • Enhanced selectivity of the refocusing pulse led to a more robust nCPMG SS-FSE signal.

Conclusions:

  • The use of more selective refocusing pulses significantly improves the robustness of the nCPMG SS-FSE technique.
  • Time-varying excitation gradients in RF pulses enable improved selectivity while preserving short echo spacing.
  • DV-SLR pulses represent a promising advancement for nCPMG SS-FSE imaging, offering better signal stability and maintaining acquisition speed.