Table 3.

Descriptive statistics for treatment plans based on the planning CT scan and the CBCT scan of fraction 27

	Planning CT median [range]	CBCT 27 median [range]
Rectal volume (cc)	88.7 [56.1–187.4]	68.65 [45.3–200.8]
Mean rectal dose (Gy)	26.2 [10.9–34.6]	33.9 [19.3–38.7]
V75Gy (cc)	0.1 [0.0–1.6]	0.7 [0.0–5.9]
Complication risk (%)	4.1 [3.8–11.9]	4.5 [3.9–11.6]

CT computed tomography, CBCT cone-beam computed tomography, V _75Gy volume receiving at least a 2 Gy equieffective dose (EQD2₃) of 75 Gy, Mean rectal dose mean EQD2₃ dose in the anorectum