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 groups
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
Main files (1)
Article (Published version)
accessLevelRestricted
Identifiers
Journal ISSN0740-3194
610views
0downloads

Technical informations

Creation16/12/2013 08:25:00
First validation16/12/2013 08:25:00
Update14/03/2023 20:48:45
Status update14/03/2023 20:48:44
Last indexation30/10/2024 15:42:19
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack