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X-ray technique factors employed in the CT number reproducibility and uniformity study.
| Protocol | Pitch | Thickness (mm) | Interval (mm) | kVp | mAs | Reconstruction kernel | FOV (cm) |
|---|---|---|---|---|---|---|---|
| High Resolution | 0.531:1 | 0.625 | 0.3/0.625a | 120 | 320 | Standard | 30/36b |
| NLST | 1.375:1 | 2.5 | 2 | 120 | 40 | Standard | 36 |
| LTRC | 1.375:1 | 1.25 | 0.625 | 140 | 150 | Bone | 30 |
0.3 mm for 4.8-mm diameter nodules and 0.625 mm for 9.5 and 16-mm diameter nodules.
30 cm for 4.8 mm diameter nodules and 36 cm for 9.5 and 16-mm diameter nodules.
