Multimodal image-guided volumetric modulated arc radiotherapy for postoperative esophageal cancer: A prospective randomized controlled trial

Table 1 Comparison of the radiation dose distribution between the two groups, mean ± SD

Groups	GTV D95% (Gy)	CTV D95% (Gy)	PTV D95% (Gy)	Lung V20 (%)	Lung V30 (%)	Heart V30 (%)	Heart V40 (%)	Spinal cord Dmax (Gy)
Experimental group (n = 32)	55.8 ± 1.2	54.5 ± 1.3	50.2 ± 1.4	18.3 ± 3.2	12.1 ± 2.8	20.7 ± 3.1	12.3 ± 2.9	45.8 ± 1.6
Control group (n = 33)	52.3 ± 1.5	47.6 ± 1.7	47.6 ± 1.7	22.5 ± 3.7	15.4 ± 3.0	24.6 ± 3.5	15.7 ± 3.2	49.3 ± 1.8
t	10.368	18.340	6.719	4.888	4.581	4.750	4.484	8.276
P value	< 0.01	< 0.01	< 0.01	< 0.01	< 0.01	< 0.01	< 0.01	< 0.01

GTV: Gross tumor volume; CTV: Clinical target volume; PTV: Planning target volume; D95%: Differences in dose coverage; Dmax: Maximum dose.