Table 1. Comparison of the OPM- and SQUID-based MEG system performance.
| Subject ID | Experiment Type | Error (mm) | OPM rv | SQUID gof (%) (26) | OPM/SQUID SNR |
|---|---|---|---|---|---|
| M87172872 | SEF | 3.9 | 0.0249 | 86.3 | 14.6/17.5 |
| AEF | 9.5 | 0.0381 | 97.1 | 26.6/15.4 | |
| M87122617 | SEF | 7.5 | 0.0144 | 58.5 | 24.9/7.4 |
| AEF | 7.1 | 0.0059 | 79.2 | 26.7/16.6 | |
| M87103395 | SEF | 9.7 | 0.0212 | 87.9 | 16.1/13.3 |
| AEF | 6.2 | 0.0193 | 86.3 | 35.5/15.6 |
Ground truth is the source location provided by the commercial Elekta-Neuromag SQUID-based MEG system; the distance between the locations of the equivalent current dipole calculated by the OPM-based MEG system and that of the commercial SQUID-based MEG system is shown in the Error column. OPM rv refers to the residual variance between the measured data and the reconstructed data from the localized sources; goodness of fit for the SQUID data is shown in the column labeled SQUID gof (%); last column compares the signal to noise ratio of both systems.