Table 2.
Photon equivalent dose per MU to selected organs from the box treatment, the box treatment plus the 6-field boost and the 7-field IMRT treatment for prostate cancer. For the 4-field box plus the 6-field boost we assume that the two treatments use equal amounts of MUs. Accompanying each value is the percent relative error calculated for each value. The percent relative error is the variance of the calculated dose divided by the dose itself.
| Photon equivalent dose (μSv MU−1) |
|||
|---|---|---|---|
| Organ | 4-field box (%) | 4-field box + 6-field boost (%) | 7-field IMRT (%) |
| Stomach | 7.0 (1.6) | 14.1 (1.1) | 5.3 (2.9) |
| Colon | 15.0 (1.3) | 37.3 (0.9) | 11.1 (3.2) |
| Liver | 5.8 (1.2) | 11.9 (0.9) | 4.9 (2.0) |
| Lung | 2.9 (1.1) | 6.0 (1.0) | 2.9 (2.0) |
| Esophagus | 1.8 (5.6) | 3.7 (3.9) | 1.8 (3.2) |
| Pancreas | 4.6 (3.7) | 9.6 (2.5) | 4.2 (3.5) |
| Brain | 0.9 (3.3) | 1.6 (2.4) | 1.2 (3.6) |
| Active bone marrow | 2.2 (1.3) | 6.8 (0.6) | 3.7 (4.3) |
| Small intestine | 54.7 (0.5) | 111.0 (0.3) | 21.5 (0.8) |
| Spleen | 5.0 (3.1) | 10.6 (2.2) | 4.3 (3.6) |
| Gall bladder | 6.1 (2.9) | 12.5 (2.1) | 4.7 (2.5) |
| Heart | 3.3 (1.7) | 6.5 (1.3) | 3.6 (3.6) |
| Lymph node | 8.7 (4.2) | 43.2 (1.2) | 7.1 (1.6) |
| Kidneys | 10.0 (1.7) | 21.5 (1.2) | 5.8 (3.7) |
| Thyroid | 1.6 (10.0) | 3.2 (7.1) | 1.6 (10.8) |