Table 2:

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.