Table 7. Differences in the L/N ratio in cases with radiation-induced necrosis among the three PET centers.
| Subject | L/N max | L/N mean | L/N max mean | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A | B | C | P value | A | B | C | P value | A | B | C | P value | |
| Around | 1.2 ± 0.2 | 1.3 ± 0.4 | 1.4 ± 0.3 | 1.2 ± 0.2 | 1.4 ± 0.4 | 1.4 ± 0.4 | 1.7 ± 0.4 | 1.8 ± 0.7 | 1.7 ± 0.5 | |||
| Contralateral | 1.2 ± 0.3 | 1.3 ± 0.4 | 1.2 ± 0.2 | 0.36 | 1.2 ± 0.4 | 1.2 ± 0.4 | 1.1 ± 0.2 | 0.71 | 1.5 ± 0.2 | 1.6 ± 0.6 | 1.6 ± 0.4 | 0.46 |
| Frontal lobe | 1.2 ± 0.4 | 1.4 ± 0.4 | 1.3 ± 0.3 | 0.40 | 1.1 ± 0.4 | 1.2 ± 0.4 | 1.2 ± 0.3 | 0.55 | 1.6 ± 0.2 | 1.7 ± 0.9 | 1.6 ± 0.5 | 0.99 |
| Cerebellum | 1.0 ± 0.3 | 1.1 ± 0.3 | 1.1 ± 0.2 | 0.38 | 0.8 ± 0.3 | 1.0 ± 0.3 | 0.9 ± 0.3 | 0.45 | 1.2 ± 0.1 | 1.2 ± 0.6 | 1.3 ± 0.4 | 0.66 |
A: PET cancer (A), B: PET cancer (B), C: PET cancer (C), L/N ratio: lesion to normal tissue ratio L/Nmax: SUVmax (lesion) / SUVmax (reference), L/Nmean: SUVmean (lesion)/ SUV mean (reference), L/N max mean: SUVmax (lesion)/ SUV mean (reference).