Table 4.
Screw gradings per reader and modality of cases where CBCT and CT differed in their final screw rating (i.e., correct/incorrect screw rating)
| Reader 1—CBCT | Reader 2—CBCT | Reader 3—CBCT | Reader 1—CT | Reader 2—CT | Reader 3—CT | Pedicle | Follow-up time, CT (months) | Breach direction | Pedicle:screw width ratio | |
|---|---|---|---|---|---|---|---|---|---|---|
| Case: False negative | 2 | 1 | 1 | 1 | 2 | 2 | T9 left | 12 | Lateral | 1.25 |
| Case: False positive #1 | 2 | 2 | 2 | 1 | 1 | 1 | T7 left | 12 | Lateral | 0.67 |
| Case: False positive #2 | 1 | 2 | 2 | 1 | 2 | 1 | T7 left | 0 | Lateral | 0.78 |
| Case: False positive #3 | 2 | 2 | 2 | 1 | 1 | 1 | T11 left | 7 | Medial | 1.44 |
| Case: False positive #4 | 2 | 2 | 2 | 0 | 1 | 1 | T10 left | 8 | Lateral | 1.20 |
| Case: False positive #5 | 2 | 2 | 2 | 1 | 1 | 1 | T9 right | 9 | Lateral | 0.89 |
| Case: False positive #6 | 2 | 1 | 2 | 1 | 1 | 1 | T10 right | 9 | Lateral | 0.84 |
CBCT cone beam computed tomography, CT computed tomography