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Comparison of technologies commonly used in MCG.
| Shielded | Unshielded | Room temp | Sensitivity Intrinsic x10−15 T |
Noise floor / Hz1/2 Unshielded x10−15T |
Gradiometer | Cost | Maint. | |
|---|---|---|---|---|---|---|---|---|
| SQUID | ✓ | ✓ | − | <10−3 | >102 | ✓ | ++++ | ++++ |
| OPM | ✓ | ✓ | ✓ | <10−1 | <103 | ✓ | ++++ | ++ |
| Fluxgate | ✓ | ✓ | ✓ | >103 | >104 | ✓ | ++/+++ | + |
| QFlux | ✓ | ? | ✓ | > 101 | − | ? | ? | ? |
| NVD | ✓ | ✓ | ✓ | <10−1 | <6 × 102 | ? | ++ | ++ |
| Coil | ✓ | ✓ | ✓ | >104 | >105 | ✓ | + | + |
