Table 2.

Dose index of the rectum for the treatment plans on pre- and post-CT images and the results for the five irradiation techniques

	Absolute dose (mean ± SD, Gy)
	D80%			D50%			D20%			D2%
	SO(−)	SO(+)	P-value	SO(−)	SO(+)	P-value	SO(−)	SO(+)	P-value	SO(−)	SO(+)	P-value
3DCRT	8.64 ± 5.64	8.98 ± 6.85	0.6742	27.05 ± 5.19	22.29 ± 3.76	<0.0001	61.47 ± 6.92	40.08 ± 6.10	<0.0001	74.26 ± 0.89	68.14 ± 3.19	<0.0001
VMAT	5.66 ± 2.21	4.98 ± 2.11	0.1231	17.27 ± 4.04	11.38 ± 3.75	<0.0001	49.78 ± 5.32	31.90 ± 6.91	<0.0001	72.39 ± 1.70	62.03 ± 7.04	<0.0001
HT	6.67 ± 4.26	6.65 ± 4.69	0.4749	22.21 ± 3.81	17.48 ± 5.17	<0.0001	44.49 ± 5.45	30.15 ± 5.64	<0.0001	73.36 ± 7.83	53.68 ± 7.26	<0.0001
CK	6.71 ± 1.73	5.38 ± 1.86	0.0005	13.87 ± 2.83	9.76 ± 2.13	<0.0001	25.50 ± 3.72	15.83 ± 2.34	<0.0001	36.10 ± 1.52	24.33 ± 1.81	<0.0001
Proton	0.12 ± 0.14	0.09 ± 0.08	0.2699	1.94 ± 1.32	0.91 ± 0.41	<0.0001	23.29 ± 7.15	7.15 ± 2.61	<0.0001	61.35 ± 3.10	35.77 ± 6.51	<0.0001