TABLE 1.
Mean differences, standard deviation, and margins needed to apply in the case that a Foley catheter is used to represent the urethra.
| Prostate sector | 0 | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean difference (mm) | LAT | −0.5 | −0.4 | −0.3 | −0.2 | 0.0 | 0.1 | 0.3 | 0.7 | 1.1 | 1.6 | 2.2 |
| AP | −0.1 | 0.7 | 1.4 | 2.0 | 2.7 | 3.5 | 4.1 | 4.5 | 4.9 | 5.4 | 5.8 | |
| Standard deviation (mm) | LAT | 1.6 | 1.5 | 1.5 | 1.5 | 1.5 | 1.8 | 1.9 | 2.2 | 2.8 | 3.6 | 4.6 |
| AP | 2.3 | 2.3 | 2.5 | 2.8 | 2.8 | 3.0 | 3.2 | 3.6 | 4.2 | 5.6 | 7.5 | |
| Margin (mm) (2.15σ) | LAT | 3.5 | 3.3 | 3.2 | 3.2 | 3.3 | 3.8 | 4.0 | 4.7 | 6.0 | 7.7 | 10.0 |
| AP | 4.9 | 4.8 | 5.4 | 6.0 | 6.1 | 6.4 | 7.0 | 7.6 | 8.9 | 12.1 | 16.2 |
Abbreviations: AP, anterior‐posterior; LAT, lateral.