Table 6. The standard of dose limitation in critical structures and its actual exposure dose.
| Critical structures | Total max dose (Gy) | D33.3* (Gy) | Max dose(Gy) per fraction | Dose constraints** | |
|---|---|---|---|---|---|
| Mean(range) | Mean(range) | Mean(range) | Volume | Dose | |
| Stomach | 10.2(5.4∼21.5) | — | 2.4(1.8∼4.6) | Any point | 6 Gy per fraction |
| Duodenum | 11.8(4.8∼27.6) | — | 2.8(1.6∼5.5) | Any point | 6 Gy per fraction |
| Spinal cord | 4.8(3.6∼11.2) | — | 2.1(1.0∼3.6) | Any point | 5Gy per fraction |
| Left kidney | — | 4.2(1.6∼9.4) | 1.6(1.2∼2.6) | <1/3 of the total volume | 4 Gy per fraction |
| Right kidney | — | 5.7(3.6∼17.2) | 2.6(1.5∼3.7) | <1/3 of the total volume | 4 Gy per fraction |
*D33.3=33.3 percentage of Volume receiving the exposure dose.
**Dose constraints: Dose constraints for critical structures were taken 5 fractions as a standard.