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Measured optical focal spot size using the line-pair gauge method for different emitted currents and focusing voltages (anode potential held constant at 80 kVp).
| Emitted current (mA) | Grid voltage (V) | ECE voltage (kV) | FP voltage (kV) | Focal spot size (mm × mm) |
|---|---|---|---|---|
| 84 | 20 | 4 | 2.4 | 0.4 × 0.8 |
| 313 | 200 | 4 | −0.4 | 0.4 × 1.2 |
| 1000 | 450 | 6 | −2.2 | 0.5 × 1.4 |
