Table 6:
False positives and false negative levels with different thresholds set for Detection Ratios when using PTeye™. A Detection Ratio of 1.2 is the threshold set by the manufacturer of PTeye™ for parathyroid identification.
| Detection Ratio Threshold set in PTeye™ - 1.2 |
High confidence |
Medium confidence |
Low confidence |
Total | |
|---|---|---|---|---|---|
| 83 patients (overall) | 226 | 27 | 83 | 336 | |
| False Positive at 1.2 | 5 | 1 | 13 | 19 | |
| False Negative at 1.2 | 0 | 0 | 0 | 0 | |
| 19 patients (Initial set) | Detection Ratio not recorded | 54 | 2 | 14 | 70 |
| False Positive at 1.2 | 2 | 0 | 1 | 3 | |
| False Negative at 1.2 | 0 | 0 | 0 | 0 | |
| 64 patients (2nd set) | Detection Ratio recorded | 172 | 25 | 69 | 266 |
| False Positive at 1.2 | 3 | 1 | 12 | 16 | |
| False Positive at 1.5 | 3 | 0 | 9 | 12 | |
| False Positive at 1.8 | 3 | 0 | 6 | 9 | |
| False Positive at 2.0 | 2 | 0 | 6 | 8 | |
| False Negative at 1.2 | 0 | 0 | 0 | 0 | |
| False Negative at 1.5 | 0 | 0 | 0 | 0 | |
| False Negative at 1.8 | 1 | 1 | 0 | 2 | |
| False Negative at 2.0 | 1 | 1 | 0 | 2 |