In vivo GABA editing using a novel doubly selective multiple quantum filter

J Shen, DL Rothman, P Brown - Magnetic Resonance in …, 2002 - Wiley Online Library
J Shen, DL Rothman, P Brown
Magnetic Resonance in Medicine: An Official Journal of the …, 2002Wiley Online Library
A novel multiple quantum filtering method is proposed that uses a doubly selective pulse
termed Delays Alternating with Nutations for Tailored Excitation (DANTE) for multiple
quantum preparation. This method selectively prepares GABA‐3 and GABA‐4 into a multiple
quantum state and suppresses all other resonances at 3.0 ppm in each single scan.
Phantom tests demonstrated excellent GABA signal retention and complete suppression of
overlapping metabolites. It is shown using numerical simulations that overlapping …
Abstract
A novel multiple quantum filtering method is proposed that uses a doubly selective pulse termed Delays Alternating with Nutations for Tailored Excitation (DANTE) for multiple quantum preparation. This method selectively prepares GABA‐3 and GABA‐4 into a multiple quantum state and suppresses all other resonances at 3.0 ppm in each single scan. Phantom tests demonstrated excellent GABA signal retention and complete suppression of overlapping metabolites. It is shown using numerical simulations that overlapping macromolecules are suppressed because the frequency of the first upfield 2π rotation of the doubly selective DANTE pulse coincides with that of the macromolecules at 1.72 ppm. Excellent suppression of overlapping macromolecules was demonstrated in vivo. Using this method the concentration of GABA in the occipital lobe of healthy volunteers was measured to be 1.21 ± 0.28 μmol/mL (mean ± SD, N = 9). Magn Reson Med 47:447–454, 2002. © 2002 Wiley‐Liss, Inc.
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