Scan-to-scan variability for the calibration phantom method
| Lobe and Metabolite | Relative Variability | Relative Variability (%) | Absolute Variability | Absolute Variability (%) | ||||
|---|---|---|---|---|---|---|---|---|
| Right | Left | Right | Left | Right | Left | Right | Left | |
| Temporal lobe (n = 14) | ||||||||
| NAA | 0.2 ± 0.7 | −0.5 ± 1.0 | 7 ± 18 | −4 ± 13 | 0.9 ± 0.8 | 0.7 ± 0.3 | 15 ± 12 | 12 ± 6 |
| NAA+NAAG | 0.3 ± 1.2 | 0.5 ± 1.2 | −5 ± 17 | −9 ± 17 | 0.9 ± 0.8 | 1.1 ± 0.7 | 13 ± 12 | 16 ± 10 |
| Cr | 0.3 ± 1.0 | −0.0 ± 0.9 | −8 ± 27 | 0 ± 17 | 0.7 ± 0.8 | 0.6 ± 0.5 | 18 ± 22 | 13 ± 10 |
| mI | −0.1 ± 1.0 | 0.1 ± 0.5 | −0 ± 26 | −3 ± 17 | 0.7 ± 0.5 | 0.4 ± 0.2 | 22 ± 14 | 15 ± 9 |
| Cho | 0.0 ± 0.3 | 0.1 ± 0.2 | −5 ± 21 | −5 ± 12 | 0.3 ± 0.2 | 0.2 ± 0.1 | 18 ± 12 | 11 ± 6 |
| Glx | 0.5 ± 2.0 | −0.3 ± 3 | −10 ± 24 | −2.5 ± 39 | 1.4 ± 0.8 | 2 ± 2 | 20 ± 15 | 29 ± 25 |
| Frontal lobe (n = 14) | ||||||||
| NAA | 0.0 ± 0.6 | 0.0 ± 0.5 | 1 ± 10 | 0.5 ± 9 | 0.5 ± 0.3 | 0.4 ± 0.4 | 8 ± 4 | 6 ± 6 |
| NAA+NAAG | −0.3 ± 1.7 | −0.2 ± 0.7 | −4 ± 24 | 3 ± 10 | 0.8 ± 1.5 | 0.6 ± 0.4 | 12 ± 21 | 8 ± 6 |
| Cr | 0.1 ± 0.5 | −0.1 ± 0.3 | 7 ± 6 | −3 ± 13 | 0.4 ± 0.3 | 0.3 ± 0.2 | 11 ± 7 | 7 ± 6 |
| mI | 0.0 ± 0.5 | 0.0 ± 0.6 | −4 ± 23 | −5 ± 26 | 0.4 ± 0.4 | 0.4 ± 0.4 | 15 ± 18 | 18 ± 20 |
| Cho | 0.0 ± 0.2 | 0.0 ± 0.2 | −2.5 ± 15 | −3 ± 17 | 0.1 ± 0.1 | 0.1 ± 0.1 | 11 ± 11 | 12 ± 12 |
| Glx | 0.8 ± 1.0 | 0.0 ± 0.9 | −12 ± 17 | −1 ± 13 | 0.9 ± 0.9 | 0.6 ± 0.6 | 13 ± 16 | 9 ± 9 |