Table 4 Treatment and dosimetry results
| Â | IBD | No IBD | p value | ||
|---|---|---|---|---|---|
n | % | n | % | ||
Radiation dose | Â | Â | Â | Â | Â |
 3500 cGy in 5 fractions | 26 | 84 | 3139 | 75 | 0.46 |
 3625 cGy in 5 fractions | 3 | 10 | 537 | 13 |  |
Whole pelvis | Â | Â | Â | Â | Â |
 2100 cGy in 3 fractions | 1 | 3 | 422 | 10 |  |
 1950 cGy in 3 fractions | 1 | 3 | 86 | 2 |  |
IBD Dosimetric parameters | Mean | Median | Range | ||
|---|---|---|---|---|---|
Target coverage | Â | Â | Â | ||
 CTV VRx (%) | 99 | 100 | 99–100 | ||
 PTV VRx (%) | 97 | 97 | 95–100 | ||
IDL (%) | 84 | 84 | 83–88 | ||
Max dose (cGy) | 4200 | 4200 | 4118–4217 | ||
Rectum Max (cGy) | 3800 | 3800 | 3604–3919 | ||
Rectum V37.8 (%) | 0.1 | 0 | 0–0.3 | ||
V37.8 cc (cc) | 0.04 | 0 | 0–0.2 | ||
Rectum V33.9 (%) | 5.2 | 4.7 | 1–13 | ||
V33.9 cc (cc) | 2.7 | 2 | 1–9 | ||
Rectum V29 (%) | 15 | 15 | 6–25 | ||
V29 cc (cc) | 7.7 | 6.3 | 3–18 | ||
Rectum V19.2 (%) | 37 | 37 | 20–56 | ||
V19.2 cc (cc) | 19 | 16 | 9–34 | ||
Rectum V36 (cc) | 0.35 | 0.29 | 0.01–1 | ||
Large Bowel Max (cGy) | 2600 | 2600 | 1239–3689 | ||
Small Bowel Max (cGy) | 1100 | 1100 | 956–1224 | ||