Table 2 Mean perirectal distances (mm) measured on the CT simulation scan (n = 20). Standard deviation immediately beneath corresponding perirectal distance. The mean perirectal distance and standard deviation at each of 5 axial slices (right) and 5 sagittal slices (bottom) are also reported
| Â | Left | Midline | Right | Mean | Stdev | |||
|---|---|---|---|---|---|---|---|---|
2Â cm | 1Â cm | 0 | 1Â cm | 2Â cm | Â | Â | ||
Superior (base) | + 2 cm | 14.4 | 12.5 | 14.5 | 13.8 | 18.1 | 14.7 | 10.3 |
6 | 8.2 | 11.1 | 9.6 | 16.9 | Â | Â | ||
+ 1 cm | 19.1 | 11 | 9.9 | 11.3 | 13 | 12.9 | 7.5 | |
11.2 | 7.5 | 5.8 | 5.9 | 10.7 | Â | Â | ||
Midgland | 0 | 11.9 | 9 | 9.1 | 10.5 | 11.9 | 10.5 | 5.3 |
4 | 5.3 | 4.3 | 5.5 | 12.2 | Â | Â | ||
Inferior (apex) | −1 cm | 8.7 | 8.2 | 8.5 | 8.2 | 9.4 | 8.6 | 5.6 |
2.6 | 5.9 | 5.1 | 6.8 | 2.2 | Â | Â | ||
−2 cm |  | 7.6 | 5.5 | 6.1 |  | 6.4 | 4.5 | |
| Â | 4.3 | 4.2 | 4.4 | Â | Â | Â | ||
| Â | Mean | 13.5 | 9.7 | 9.5 | 10 | 13.1 | 10.1 | 7.4 |
| Â | Stdev | 7.7 | 6.4 | 6.9 | 6.9 | 12.5 | Â | Â |