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

Mlynárik, Vladimír
Gambarota, Giulio
Frenkel, Hanne
Published in Magnetic Resonance in Medicine. 2006, vol. 56, no. 5, p. 965-70
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 AlgorithmsAnimalsBrain/metabolismMagnetic Resonance Spectroscopy/methodsMaleNerve Tissue Proteins/analysisNeurotransmitter Agents/analysisProtons/diagnostic useRatsRats, Sprague-DawleyReproducibility of ResultsSensitivity and Specificity
PMID: 16991116
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Research group CIBM (863)
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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. 965-70. doi: 10.1002/mrm.21043 https://archive-ouverte.unige.ch/unige:32912

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Deposited on : 2014-01-08

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