Table VI.
Single diagnostic value of six semi-quantitative analysis indexes.
| Index | Cut-off* | AUC | Sen (%) |
Spe (%) |
NPV (%) |
PPV (%) |
|---|---|---|---|---|---|---|
| SUVmax of the lesion at 10 mins | 2.6 | 0.814 | 78.3 | 93.8 | 75.0 | 94.7 |
| SUVmax of the lesion at 60 mins | 2.9 | 0.806 | 65.2 | 93.8 | 65.2 | 93.8 |
| SUVmax of the lesion/SUVmean of the normal bone at 10 mins | 3.5 | 0.895 | 82.6 | 93.8 | 78.9 | 95.0 |
| SUVmax of the lesion/SUVmean of the normal bone at 60 mins | 3.4 | 0.969 | 91.3 | 93.8 | 88.2 | 95.5 |
| SUVmax of the lesion/SUVmean of the normal muscle at 10 mins | 5.7 | 0.863 | 65.2 | 100.0 | 66.7 | 100.0 |
| SUVmax of the lesion/SUVmean of the normal muscle at 60 mins | 6.0 | 0.909 | 69.6 | 100.0 | 69.6 | 100.0 |
*
When it is greater than or equal to the cut-off value, it is predicted to be diagnosed as a group of periprosthetic joint infections.
AUC, area under the curve; NPV, negative predictive value; PPV, positive predictive value; Sen, sensitivity; Spe, specificity; SUV, standardized uptake value.