T/N ratio in gliomas
| Tumor | Grade II, Mean ± SD | Grade III, Mean ± SD | Grade IV, Mean ± SD |
|---|---|---|---|
| Astrocytic tumor, n | 14 | 19 | 21 |
| MET | 2.24 ± 0.90 | 3.03 ± 1.02 | 5.03 ± 1.65 |
| FDG | 0.79 ± 0.08 | 1.27 ± 0.46 | 1.88 ± 0.78 |
| CHO | 2.69 ± 2.04 | 4.76 ± 3.04 | 18.35 ± 6.73 |
| Oligodendroglial tumor | 9 | 13 | |
| MET | 3.95 ± 1.60 | 4.46 ± 1.55 | |
| FDG | 1.03 ± 0.40 | 1.71 ± 1.09 | |
| CHO | 3.46 ± 2.52 | 12.71 ± 12.21 | |
| Oligoastrocytic tumor | 14 | 5 | |
| MET | 2.60 ± 0.91 | 2.83 ± 0.99 | |
| FDG | 1.00 ± 0.45 | 0.85 ± 0.15 | |
| CHO | 3.78 ± 3.36 | 3.02 ± 1.74 |
Note:—T/N ratio indicates tumor/normal brain uptake ratio; MET, 11C-methionine; FDG, [18F] fluorodeoxyglucose; CHO, 11C-choline.