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Scientific article
English

Localized short-echo-time proton MR spectroscopy with full signal-intensity acquisition

Published inMagnetic resonance in medicine, vol. 56, no. 5, p. 965-970
Publication date2006
Abstract

We developed a short-echo-time (TE) sequence for proton localized spectroscopy by combining a 1D add-subtract scheme with a doubly slice-selective spin-echo (SE) sequence. The sequence preserves the full magnetization available from the selected volume of interest (VOI). By reducing the number of radiofrequency (RF) pulses acting on transverse magnetization, we were able to minimize the TE to the level that is achievable with the stimulated echo acquisition mode (STEAM) technique, and also gained a twofold increase in sensitivity. The use of an adiabatic pulse in the add-subtract localization improved the efficiency of excitation in spatially inhomogeneous RF fields, which are frequently encountered at high magnetic fields. The localization performance and sensitivity gains of this method, which is termed SPin ECho, full Intensity Acquired Localized (SPECIAL) spectroscopy, were demonstrated in vivo in rat brains. In conjunction with spectroscopic imaging, a 2-microl spatial resolution was accomplished with a signal-to-noise ratio (SNR) above 30, which is usually sufficient for reliable quantification of a large number of metabolites (neurochemical profile).

Keywords
  • Algorithms
  • Animals
  • Brain/metabolism
  • Magnetic Resonance Spectroscopy/methods
  • Male
  • Nerve Tissue Proteins/analysis
  • Neurotransmitter Agents/analysis
  • Protons/diagnostic use
  • Rats
  • Rats, Sprague-Dawley
  • Reproducibility of Results
  • Sensitivity and Specificity
Research group
Citation (ISO format)
MLYNÁRIK, Vladimír et al. Localized short-echo-time proton MR spectroscopy with full signal-intensity acquisition. In: Magnetic resonance in medicine, 2006, vol. 56, n° 5, p. 965–970. doi: 10.1002/mrm.21043
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Article (Published version)
accessLevelRestricted
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ISSN of the journal0740-3194
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