TABLE I.
Beamformer performance metrics for the four algorithms (delay sum and integrate (DSI), robust Capon Beamforming (RCB), Phase Coherence Factor Masked DSI (PDSI), and Amplitude Coherence Factor Masked DSI (ADSI)) for source densities of 7.5×105 or 6.9×103 sources/mL. Spatial filter thresholds were based on precision-recall Analysis for all Source Patterns. Bolded Numbers Highlight the Maximum Values for the Beamformer Performance Binary Classifier Metrics. Italicized Numbers are Statistically Significantly Lower than the Maximum Values.
| Source density (sources/mL) | Binary Classifier Metric (%) | DSI | RCB | PDSI | ADSI |
|---|---|---|---|---|---|
|
| |||||
| 7.5×105 | AUROC | 97.8 ± 0.1 | 98.5 ± 0.1 | 88.4 ± 0.3 | 88.6± 0.3 |
| Threshold | 0.643 | 0.549 | 0.619 | 0.612 | |
| Specificity | 97.73 ± 0.04 | 97.34 ± 0.05 | 97.84 ± 0.04 | 97.78 ± 0.04 | |
| Sensitivity | 77.5 ± 0.5 | 82.1 ± 0.4 | 76.8 ± 0.5 | 78.0 ± 0.5 | |
| PPV | 68.3 ± 0.5 | 66.0 ± 0.5 | 69.1 ± 0.5 | 68.9 ± 0.5 | |
| F1 | 72.6 ± 0.4 | 73.2 ± 0.4 | 72.8 ±0.4 | 73.2 ± 0.4 | |
|
| |||||
| 6.9×103 | AUROC | 95.6 ± 0.3 | 96.5 ± 0.3 | 86.8 ± 0.5 | 87.9 ± 0.5 |
| Threshold | 0.539 | 0.432 | 0.462 | 0.482 | |
| Specificity | 94.14 ± 0.06 | 93.48 ± 0.07 | 94.29 ± 0.07 | 94.02 ± 0.07 | |
| Sensitivity | 79.1 ± 0.8 | 86.0 ± 0.7 | 78.4 ± 0.9 | 80.8 ± 0.8 | |
| PPV | 19.7 ± 0.4 | 19.3 ± 0.4 | 19.9 ± 0.4 | 19.7 ± 0.4 | |
| F1 | 31.5 ± 0.6 | 31.5 ± 0.6 | 31.8 ± 0.6 | 31.6 ± 0.6 | |