SmartArc-based volumetric modulated arc therapy for endometrial cancer: a dosimetric comparison with helical tomotherapy and intensity-modulated radiation therapy

Table 3 Summary of OARs and NT dose distribution for VMAT-S, IMRT and HT plans $(\bar{x} \pm σ)$

Structures		V₁₀	V₂₀	V₃₀	V₄₀	V₅₀	D_mean(Gy)
Bowel	Mean (VMAT-S)	0.88	0.70	0.39	0.22	0.08	27.35
	Mean (IMRT)	0.83	0.66	0.40	0.22	0.09	26.72
	P	0.02	0.03	0.15	0.27	0.39	0.02
	Mean (HT)	0.91	0.72	0.38	0.19	0.08	26.91
	P	0.07	0.08	0.13	0.10	0.61	0.03
Rectum	Mean (VMAT-S)	0.99	0.96	0.82	0.54	0.25	40.33
	Mean (IMRT)	0.98	0.96	0.93	0.63	0.27	42.40
	P	0.19	0.52	0.03	0.00	0.06	0.01
	Mean (HT)	1.00	0.98	0.85	0.57	0.25	40.99
	P	0.21	0.31	0.31	0.08	0.36	0.12
Bladder	Mean (VMAT-S)	1.00	0.96	0.67	0.35	0.16	36.23
	Mean (IMRT)	0.99	0.91	0.70	0.38	0.17	36.33
	P	0.36	0.03	0.03	0.04	0.37	0.17
	Mean (HT)	1.00	0.86	0.65	0.33	0.14	35.09
	P	0.52	0.02	0.16	0.08	0.38	0.06
Pelvic bones	Mean (VMAT-S)	0.91	0.73	0.40	0.22	0.08	27.85
	Mean (IMRT)	0.84	0.65	0.45	0.25	0.09	27.28
	P	0.00	0.00	0.03	0.03	0.17	0.13
	Mean (HT)	0.91	0.69	0.41	0.24	0.09	28.22
	P	0.51	0.08	0.07	0.06	0.53	0.61
Normal tissue	Mean (VMAT-S)	0.79	0.45	0.21	0.11	0.05	20.48
	Mean (IMRT)	0.68	0.42	0.21	0.12	0.05	19.77
	P	0.00	0.03	0.15	0.15	0.25	0.08
	Mean (HT)	0.81	0.42	0.17	0.06	0.03	20.56
	P	0.35	0.10	0.07	0.09	0.12	0.15

OARs: organs at risk, NT: normal tissue, VMAT-S: volumetric modulated arc therapy with SmartArc, IMRT: intensity-modulated radiotherapy, HT: helical tomotherapy, V₁₀, V₂₀, V₃₀, V₄₀ and V₅₀: the percentage volume of the OARs and NT receiving a dose of 10, 20, 30, 40 and 50 Gy, respectively, D _mean: mean dose.

ISSN: 1471-2407