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| Optical | Electromagnetic | Mechanical | X-ray | |
| Typical spatial resolution | 0.2-0.4 mm | 0.5-0.8 mm | 0.1-5.0 mm | 0.2 mm |
| Typical acquisition rate | 20-60 Hz | 20-200+ Hz | 300-1000 Hz | <0.2 Hz. Limited by safety considerations. |
| Line of sight issues? | Yes | Yes for some materials | No | Yes for some materials |
| Metal interference? | None | High | None | None |
| Ionizing radiation? | No | No | No | Yes |
