Table 3.
Comparisons of ITV dose coverage. CTV = clinical target volume, HCT = helical CT, CBCT = cone-beam CT. D99 = Dose to 99% of volume. Similarly, D95 = Dose to 95% of the volume. Dmean = mean dose. Values are average ± standard deviation.
| Dose Index | Group 1 | Group 2 |
|---|---|---|
| PTV(ITVCBCT) D99 (Gy) | 81.0±0.0 | 80.3±2.3 |
| ITVCBCT D99 (Gy) | 81.7±0.3 | 82.8±1.0 |
| D99(ITVHCT)/D99(ITVCBCT) (%) | 98.6±4.6 | 97.4±5.1 |
| D99(CTVWeeklyCBCT)/D99(ITVCBCT) (%) | 100.0±1.5 | 100.2±1.5 |
| PTV(ITVCBCT) D95 (Gy) | 81.7±0.2 | 82.8±1.0 |
| ITVCBCT D95 (Gy) | 82.2±0.4 | 83.7±1.3 |
| D95(ITVHCT)/D95(ITVCBCT) (%) | 100.5±0.3 | 100.7±0.5 |
| D95(CTVWeeklyCBCT)/D95(ITVCBCT) (%) | 100.1±0.8 | 100.1±0.6 |
| PTV(ITVCBCT) Dmean (Gy) | 83.9±0.6 | 85.6±1.4 |
| ITVCBCT Dmean (Gy) | 84.1±0.7 | 86.0±1.5 |
| ITVHCT Dmean (Gy) | 84.1±0.7 | 85.7±1.4 |
| Dmean(CTVWeeklyCBCT)/Dmean(ITVCBCT) (%) | 100.1±0.3 | 100.1±0.3 |