Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
| Phantom ID | Thickness (μm) |
Mean (SD*) of Spatial Frequency (lp/mmopt) | |||
|---|---|---|---|---|---|
| Layer 2 | Layer 3 | Layer 4 | Mean (SD*) | ||
| A | 8.6 | 8.5 | 7.4 | 8.2 (0.7) | 43.6 (3.8) |
| B | 15.4 | 12.3 | 15.0 | 14.2 (1.7) | 25.2 (3.2) |
| C | 17.0 | 16.6 | 17.6 | 17.1 (0.5) | 20.8 (0.6) |
| D | 22.7 | 27.3 | 24.7 | 24.9 (2.3) | 14.3 (1.3) |
| E | 34.0 | 33.6 | 36.2 | 34.6 (1.4) | 10.3 (0.4) |
| F | 52.1 | 52.7 | 54.4 | 53.1 (1.2) | 6.7 (0.1) |
*SD: standard deviation
