Fig. 3.

(a) A proton-decoupled localized ¹³C MRS spectrum of the carboxylic/amide spectral region acquired from the rat brain at 11.7 Tesla during intravenous infusion of [2,5-¹³C₂]glucose. Voxel size = 8.5 × 6 × 8.5 mm³. No. of averages = 30. Ernst’s pseudo stochastic decoupling scheme was used with γB₂ = 498 Hz at the center of the spectroscopy voxel. lb = −1, gb = 0.06. GABA-C1 = γ-amminobutyric acid C1, Glu-C5 = glutamate C5, Gln-C5 = glutamine C5, Asp-C4 = aspartate C4, Glu-C1 = glutamate C1, Asp-C1 = aspartate C1, Gln-C1 = glutamine C1, NAA-C5 = N-acetylaspartate C5. (b) In vivo ¹³C MRS spectrum acquired using the proposed windowed stochastic decoupling sequence (Fig. 2(c, d)). The peak RF amplitude of the windowed stochastic decoupling sequence is 707 Hz with decoupling power ( ${\displaystyle \sum _{\text{n}}}{\mid \text{rf}(\text{n})\mid }^2$) at 51.4% of that used in (a). All other data acquisition and processing parameters are the same as in (a).