Diagnostic Value of 18F-FDG PET Using Visual and Semiquantitative Analysis in 32 Patients Suspected of Having Gallbladder Carcinoma
| Visual analysis | Semiquantitative analysis | ||||
|---|---|---|---|---|---|
| Parameter | Early image | Delayed image | SUVearly | SUVdelayed | RI |
| Sensitivity | 82.6% (19/23) | 91.3% (21/23) | 82.6% (19/23) | 95.7% (22/23) | 100% (23/23) |
| Specificity | 44.4% (4/9) | 44.4% (4/9) | 55.6% (5/9) | 44.4% (4/9) | 44.4% (4/9) |
| PPV | 79.2% (19/24) | 80.8% (21/26) | 82.6% (19/23) | 81.5% (22/27) | 82.1% (23/28) |
| NPV | 50.0% (4/8) | 66.7% (4/6) | 55.6% (5/9) | 80.0% (4/5) | 100% (4/4) |
| Accuracy | 71.9% (23/32) | 78.1% (25/32) | 75.0% (24/32) | 81.3% (26/32) | 84.4% (27/32) |
PPV = positive predictive value; NPV = negative predictive value.
Numbers in parentheses indicate numbers of patients. SUVearly cutoff value was 4.50; SUVdelayed cutoff value was 2.90; RI cutoff value was −8.