Table 1.
Sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) with respective 95% confidence intervals (CI) for all observers for conventional and iodine map images
| Sensitivity* (95%CI; TP/[TP + FP]) | Specificity* (95%CI; TN/[TN + FP]) | PPV* (95%CI; TP/[TP + FP]) | NPV* (95%CI; TN/[TN + FN]) | Average confidence | |
|---|---|---|---|---|---|
| Conventional 120 kVp-like images | |||||
| Radiologist 1 | 85.7 (56–100; 12/14) | 64.7 (46–83; 11/17) | 67.4 (45–88; 12/18) | 84.6.0 (65–100; 11/13) | 3.9 |
| Radiologist 2 | 78.6 (52–100; 11/14) | 88.2 (57–100; 15/17) | 84.6 (65–100; 11/13) | 83.3 (66–100; 15/18) | 4.2 |
| Resident 1 | 71.4 (48–94; 10/14) | 82.4 (54–100; 14;17) | 76.9 (54–100; 10/13) | 78.0 (59–96; 14/18) | 3.4 |
| Resident 2 | 92.9 (60–100; 13/14) | 94.1 (61–100; 16/17) | 92.9 (79–100; 13/14) | 94.1 (83–100; 16/17) | 4.0 |
| Conventional 120 kVp-like images + Iodine map | |||||
| Radiologist 1 | 57.1 (44–70; 8/14) | 82.4 (54–100; 14/17) | 72.7 (46–99; 8/11) | 70.0 (47–87; 14/20) | 4.3 |
| Radiologist 2 | 71.4 (48–94; 10/14) | 94.1 (83–100; 16/17) | 90.9 (74–100; 10/11) | 80.0 (67–100; 16/20) | 4.0 |
| Resident 1 | 71.4 (48–94; 10/14) | 88.2 (78–98; 15/17) | 84.6 (62–100; 11/13) | 78.9 (59–95; 15/19) | 3.2 |
| Resident 2 | 78.6 (52–100; 11/14) | 88.2 (78–98; 15/17) | 84.6 (65–100; 11/13) | 83.3 (75–100; 15/18) | 4.2 |
TP true positive, TN true negative, FP false positive, FN false negative
*Values given in percentages