Table 1 Dosimetric variations for the HRCTV, bladder, rectum, sigmoid and intestine between planning CT and pre-delivery CBCT
From: Intra-fractional dosimetric analysis of image-guided intracavitary brachytherapy of cervical cancer
| CT | CBCT | Variation | Range of difference | P | |
|---|---|---|---|---|---|
| HRCTV | |||||
| Volume (cc) | 54.1 ± 17.2 | 53.1 ± 16.9 | − 2.0 ± 3.3% | 0.02–6.8 | < 0.001 |
| D90 (cGy) | 606.4 ± 39.3 | 599.1 ± 45.8 | 1.2 ± 4.5% | 0.1–79.1 | 0.120 |
| D90 (EQD2, cGy) | 813.0 ± 72.6 | 800.1 ± 83.6 | 1.2 ± 6.1% | 0.1–156.0 | 0.139 |
| Bladder | |||||
| Volume (cc) | 81.4 ± 53.5 | 81.7 ± 48.0 | 7.9 ± 36.7% | 0.3–146.1 | 0.957 |
| D2cc (cGy) | 391.6 ± 74.8 | 389.2 ± 71.9 | − 0.6 ± 17.1% | 1.8–167.8 | 0.810 |
| D2cc (EQD2, cGy) | 552.5 ± 151.1 | 542.6 ± 151.2 | 2.7 ± 26.6% | 4.2–355.2 | 0.772 |
| Rectum | |||||
| Volume (cc) | 46.2 ± 13.9 | 41.9 ± 15.5 | − 6.9% ± 34.1% | 0.02–22.5 | 0.001* |
| D2cc (cGy) | 302.9 ± 84.4 | 327.0 ± 86.9 | 9.3 ± 14.6% | 0.6–168.0 | 0.001* |
| D2cc (EQD2, cGy) | 379.1 ± 157.1 | 425.7 ± 169.3 | 15.0 ± 24.0% | 0.7–336.2 | 0.001* |
| Sigmoid | |||||
| Volume (cc) | 24.8 ± 15.72 | 24.28 ± 11.1 | 19.9 ± 68.2% | 0.2–48.9 | 0.763 |
| D2cc (cGy) | 301.5 ± 85.8 | 312.5 ± 74.6 | 7.2 ± 20.5% | 1.7–130.3 | 0.127 |
| D2cc (EQD2, cGy) | 376.9 ± 146.6 | 393.7 ± 130.4 | 11.4 ± 31.9% | 2.8–210.4 | 0.192 |
| Small intestine | |||||
| Volume (cc) | 401.0 ± 115.0 | 394.0 ± 145.7 | − 0.5 ± 26.7% | 2.3–360.7 | 0.705 |
| D2cc (cGy) | 411.2 ± 60.3 | 418.2 ± 83.4 | 1.5 ± 12.6% | 0.8–138.8 | 0.422 |
| D2cc (EQD2, cGy) | 591.9 ± 130.9 | 614.2 ± 190.0 | 3.4 ± 20.7% | 2.0–353.6 | 0.293 |