Fat signal suppression for coronary MRA at 3T using a water-selective adiabatic T2 -preparation technique

Andrew J. Coristine, Ruud B. van Heeswijk, Matthias Stuber

Research output: Contribution to journalArticlepeer-review

Abstract

PURPOSE: To improve fat saturation in coronary MRA at 3T by using a spectrally selective adiabatic T2 -Prep (WSA-T2 -Prep).

METHODS: A conventional adiabatic T2 -Prep (CA-T2 -Prep) was modified, such that the excitation and restoration pulses were of differing bandwidths. On-resonance spins are T2 -Prepared, whereas off-resonance spins, such as fat, are spoiled. This approach was combined with a CHEmically Selective Saturation (CHESS) pulse to achieve even greater fat suppression. Numerical simulations were followed by phantom validation and in vivo coronary MRA.

RESULTS: Numerical simulations demonstrated that augmenting a CHESS pulse with a WSA-T2 -Prep improved robustness to B1 inhomogeneities and that this combined fat suppression was effective over a broader spectral range than that of a CHESS pulse in a conventional T2 -Prepared sequence. Phantom studies also demonstrated that the WSA-T2 -Prep+CHESS combination produced greater fat suppression across a range of B1 values than did a CA-T2 -Prep+CHESS combination. Lastly, in vivo measurements demonstrated that the contrast-to-noise ratio between blood and myocardium was not adversely affected by using a WSA-T2 -Prep, despite the improved abdominal and epicardial fat suppression. Additionally, vessel sharpness improved.

CONCLUSION: The proposed WSA-T2 -Prep method was shown to improve fat suppression and vessel sharpness as compared to a CA-T2 -Prep technique, and to also increase fat suppression when combined with a CHESS pulse.

Original languageEnglish (US)
Pages (from-to)763-769
Number of pages7
JournalMagnetic Resonance in Medicine
Volume72
Issue number3
DOIs
StatePublished - Sep 1 2014
Externally publishedYes

Keywords

  • adiabatic
  • coronary
  • fat
  • saturation
  • suppression
  • T2-Prep

ASJC Scopus subject areas

  • Medicine(all)

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