Table 1.
Comparison of tumor detection on imaging against intra-operative findings.
| TP | FN | TN | FP | %Sen | %Spec | %Acc | p ^ | |
|---|---|---|---|---|---|---|---|---|
| Total PCI regions | ||||||||
| MRI | 110 | 114 | 227 | 17 | 49.1 | 93.0 | 72.0 | 0.755 |
| CT | 107 | 117 | 232 | 12 | 47.8 | 95.1 | 72.4 | |
| PCI region 0—central | ||||||||
| MRI | 6 | 9 | 21 | 0 | 40.0 | 100.0 | 75.0 | 1.000 |
| CT | 7 | 8 | 21 | 0 | 46.7 | 100.0 | 77.8 | |
| PCI region 1—right upper | ||||||||
| MRI | 13 | 5 | 17 | 1 | 72.2 | 94.4 | 83.3 | 1.000 |
| CT | 12 | 6 | 17 | 1 | 66.7 | 94.4 | 80.6 | |
| PCI region 2—epigastrium | ||||||||
| MRI | 6 | 10 | 19 | 1 | 37.5 | 95.0 | 69.4 | 1.000 |
| CT | 7 | 9 | 19 | 1 | 43.8 | 95.0 | 72.2 | |
| PCI region 3—left upper | ||||||||
| MRI | 9 | 5 | 18 | 4 | 64.3 | 81.8 | 75.0 | 0.500 |
| CT | 11 | 3 | 21 | 1 | 78.6 | 95.5 | 88.9 | |
| PCI region 4—left flank | ||||||||
| MRI | 9 | 4 | 19 | 4 | 69.2 | 82.6 | 77.8 | 1.000 |
| CT | 10 | 3 | 21 | 2 | 76.9 | 91.3 | 86.1 | |
| PCI region 5—left lower | ||||||||
| MRI | 12 | 8 | 12 | 4 | 60.0 | 75.0 | 66.7 | 1.000 |
| CT | 12 | 8 | 13 | 3 | 60.0 | 81.3 | 69.4 | |
| PCI region 6—pelvis | ||||||||
| MRI | 19 | 8 | 9 | 0 | 70.4 | 100.0 | 77.8 | 1.000 |
| CT | 20 | 7 | 8 | 1 | 74.1 | 88.9 | 77.8 | |
| PCI region 7—right lower | ||||||||
| MRI | 11 | 8 | 14 | 3 | 57.9 | 82.4 | 69.4 | 1.000 |
| CT | 12 | 7 | 14 | 3 | 63.2 | 82.4 | 72.2 | |
| PCI region 8—right flank | ||||||||
| MRI | 12 | 8 | 16 | 0 | 60.0 | 100.0 | 77.8 | 0.625 |
| CT | 14 | 6 | 16 | 0 | 70.0 | 100.0 | 83.3 | |
| PCI region 9—upper jejunum | ||||||||
| MRI | 3 | 12 | 21 | 0 | 20.0 | 100.0 | 66.7 | 0.250 |
| CT | 0 | 15 | 21 | 0 | 0 | 100.0 | 58.3 | |
| PCI region 10—lower jejunum | ||||||||
| MRI | 2 | 13 | 21 | 0 | 13.3 | 100.0 | 63.9 | 1.000 |
| CT | 1 | 14 | 21 | 0 | 6.7 | 100.0 | 61.1 | |
| PCI region 11—upper ileum | ||||||||
| MRI | 5 | 11 | 20 | 0 | 31.3 | 100.0 | 69.4 | 0.125 |
| CT | 1 | 15 | 20 | 0 | 6.3 | 100.0 | 58.3 | |
| PCI region 12—lower ileum | ||||||||
| MRI | 3 | 13 | 20 | 0 | 18.8 | 100.0 | 63.9 | 0.250 |
| CT | 0 | 16 | 20 | 0 | 0 | 100.0 | 55.6 |
Abbreviations: TP, true positive; FN, false negative; TN, true negative; FP, false positive; Sen, sensitivity; Spec, specificity; Acc, accuracy; NA, not available; PCI, peritoneal cancer index. ^ McNemar test to compare sensitivity of MRI and CT.