Table 3. Metabolite concentration: mean or median (standard deviation or 25–75 percentile).
| Metabolites | [1] sLASER×32 | [2] sLASER×48 | [3] sSTEAM4×32 | [4] sSTEAM4×48 | [5] sSTEAM4×64 | [6] sSTEAM8×32 |
|---|---|---|---|---|---|---|
| Aspartate | 2.98 (0.63) | 2.95 (0.63) | 1.45 (0.23) | 1.43 (0.25) | 1.30 (0.29) | 1.40 (0.26) |
| GABA | 1.84 (0.53) | 1.76 (0.61) | 1.05 (0.12) | 1.03 (0.13) | 0.99 (0.13) | 0.99 (0.13) |
| Glutamine | 2.712 (0.45) | 2.611 (0.44) | 1.69 (0.29) | 1.71 (0.29) | 1.74 (0.30) | 1.65 (0.25) |
| Glutamate | 8.112 (0.70) | 7.991 (0.71) | 6.52† (6.32–7.04) | 6.56† (6.23–7.08) | 6.43† (6.28–6.94) | 6.31 (0.48) |
| Glutathione | 1.50(0.34) | 1.46 (0.39) | 1.30† (1.11–1.40) | 1.28† (1.11–1.39) | 1.27† (1.13–1.40) | 1.17† (1.02–1.25) |
| Myo-inositol | 5.81(0.52) | 5.80 (0.51) | 5.03 (0.57) | 5.16 (0.47) | 5.24 (0.41) | 4.58 (0.51) |
| Taurine | 1.31(0.27) | 1.29 (0.25) | 1.07 (0.22) | 1.06 (0.18) | 1.05 (0.18) | 1.10 (0.17) |
| tCho | 1.34(0.14) | 1.33 (0.14) | 1.22† (1.13–1.26) | 1.22† (1.12–1.26) | 1.20† (1.11–1.26) | 1.10† (1.02–1.13) |
| tCr | 7.332 (0.43) | 7.231 (0.44) | 5.395 (5.25–5.61) | 5.42 (5.26–5.68) | 5.513 (5.31–5.69) | 5.26 (0.37) |
| tNAA | 10.77 (0.74) | 10.77 (0.73) | 7.67† (7.44–8.15) | 7.64† (7.44–8.16) | 7.59† (7.35–8.05) | 7.23† (7.06–7.80) |
Values are presented as the institutional unit, and comparisons between different sequences or TR values are not presented. †, obelisks indicate non-normal distribution, and median values are presented. Statistically significant difference (P<0.05) between different scan conditions are indicated with supersets of the numbers. sLASER, semi-LASER (TR = 6.5 s); sSTEAM4/8 = short-TE STEAM (TR = 4/8 s); ×32, ×48 and ×64 = 32, 48 and 64 averages, respectively. sLASER, semi-localized by adiabatic selective refocusing; sSTEAM, short echo time stimulated echo acquisition mode; TR, time of repetition; GABA, γ-aminobutyric acid; tCho, total choline; tCr, total creatine; tNAA, total N-acetylaspartate.