Ninety-degree angled collimator: a dosimetric study related to dynamic intensity-modulated radiotherapy in patients with endometrial carcinoma

Table 6 Overdose rates (greater than dose constraints) for organs at risk in each planning technique

	C-IMRT n(%)	A-IMRT n(%)	VMAT n(%)	Global P
Bone marrow V40 (%)	18 (90)^a	16 (80)^a	4 (20)^b	0.000 ^*
Bladder V45 (%)	19 (95)^a	0 (0)^b	0 (0)^b	0.000 ^*
Rectum V30 (%)	20 (100)^a	0 (0)^b	0 (0)^b	0.000 ^*
Bowel V35 (%)	9(45)^a	6 (30)^a	4 (20)^a	0.231
Bowel V40 (%)	8 (40)^a	5 (25)^a	4 (20)^a	0.344
Right femoral head V30 (%)	20 (100)^a	0 (0)^b	0 (0)^b	0.000 ^*
Left femoral head V30 (%)	20 (100)^a	0 (0)^b	0 (0)^b	0.000 ^*

Abbreviations: C-IMRT = 0° angled collimated dynamic IMRT planning technique; A-IMRT = 90° angled collimated dynamic IMRT planning technique; VMAT = volumetric modulated arc therapy; a,b or c = in the comparison between two groups, if the groups have the same letter, there is no statistically significant difference, but if the same letter is not found, there is a statistically significant difference; (*) means statistically significant = p < 0.05; V30 = volume receiving ≥ 30 Gy of the prescribed dose; V35 = volume receiving ≥ 35 Gy of the prescribed dose; V40 = volume receiving ≥ 40 Gy of the prescribed dose; V45 = volume receiving ≥ 45 Gy of the prescribed dose

ISSN: 1471-2407