Table 8. The cut-off value for the L/N ratio based on ROC analysis.
| Subject | All lesions | Glioma | Metastasis | ||||
|---|---|---|---|---|---|---|---|
| SUV | L/N ratio* | AUC | L/N ratio* | AUC | L/N ratio* | AUC | |
| Around | Max | 1.4 | 0.72 | 1.5 | 0.63 | 1.4 | 0.79 |
| Mean | 1.3 | 0.70 | 1.3 | 0.61 | 1.3 | 0.76 | |
| Max mean | 1.7 | 0.68 | 1.8 | 0.69 | 1.6 | 0.71 | |
| Contralateral | Max | 1.3 | 0.79 | 1.4 | 0.68 | 1.3 | 0.89 |
| Mean | 1.3 | 0.77 | 1.4 | 0.66 | 1.3 | 0.85 | |
| Max mean | 1.7 | 0.68 | 1.8 | 0.59 | 1.6 | 0.66 | |
| Frontal lobe | Max | 1.5 | 0.72 | 1.2 | 0.60 | 1.5 | 0.81 |
| Mean | 1.4 | 0.78 | 1.2 | 0.60 | 1.4 | 0.88 | |
| Max mean | 1.6 | 0.74 | 1.4 | 0.63 | 1.6 | 0.84 | |
| Cerebellum | Max | 1.2 | 0.79 | 1.0 | 0.60 | 1.2 | 0.86 |
| Mean | 1.1 | 0.81 | 1.2 | 0.71 | 1.1 | 0.89 | |
| Max mean | 1.4 | 0.75 | 1.2 | 0.59 | 1.3 | 0.83 | |
Results for the four reference regions, three types of L/N, and two types of patient as well as for all patients. L/N ratio: lesion to normal tissue ratio, SUV: standardized uptake value, Max: SUVmax (lesion) / SUVmax (reference), Mean: SUVmean (lesion)/ SUV mean (reference), L/N max mean: SUVmax (lesion)/ SUV mean (reference), AUC: area under the receiver-operating characteristic curve.
*The number shown in L/N ratio is cut off value based on ROC analysis.