Reduction of B1 sensitivity in selective single-slab 3D turbo spin echo imaging with very long echo trains

Jaeseok Park, John P. Mugler, Timothy Hughes

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Single-slab 3D turbo/fast spin echo (SE) imaging with very long echo trains was recently introduced with slab selection using a highly selective excitation pulse and short, nonselective refocusing pulses with variable flip angles for high imaging efficiency. This technique, however, is vulnerable to image degradation in the presence of spatially varying B1 amplitudes. In this work we develop a B1 inhomogeneity-reduced version of single-slab 3D turbo/fast SE imaging based on the hypothesis that it is critical to achieve spatially uniform excitation. Slab selection was performed using composite adiabatic selective excitation wherein magnetization is tipped into the transverse plane by a nonselective adiabatic-half-passage pulse and then slab is selected by a pair of selective adiabatic-full-passage pulses. Simulations and experiments were performed to evaluate the proposed technique and demonstrated that this approach is a simple and efficient way to reduce B1 sensitivity in single-slab 3D turbo/fast SE imaging with very long echo trains.

Original languageEnglish
Pages (from-to)1060-1066
Number of pages7
JournalMagnetic Resonance in Medicine
Volume62
Issue number4
DOIs
Publication statusPublished - 2009 Oct 1
Externally publishedYes

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Keywords

  • Adiabatic excitation
  • B sensitivity
  • Magnetic resonance imaging (MRI)
  • Spin echo
  • Three-dimensional
  • Variable flip angle

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Medicine(all)

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