Table 5.
Differences between ICRU rectum and bladder doses from orthogonal films and D2, and D5, of the rectum and bladder obtained from CT scans.
| Variable | Mean difference (Gy) | |||
| All patients | Group 1 | Group 2 | P (1 vs.2) | |
| Rectum | ||||
| ICRU-D2 | -3.3 | -2.9 | -3.6 | 0.24 |
| ICRU-D5 | -2.1 | -1.8 | -2.4 | 0.26 |
| Bladder | ||||
| ICRU-D2 | -3.1 | -2.3 | -3.8 | 0.01 |
| ICRU-D5 | -1.7 | -1.1 | -2.3 | 0.01 |
*Abbreviations: Group 1 = CTV coverage > 95% isodose line prescribed to Point A, Group 2 = CTV coverage < 95% isodose line prescribed to Point A. D2 = the minimum dose value in the 2.0-cc volume receiving the highest dose, D5 = the minimum dose value in the 5.0-cc volume receiving the highest dose.