However, at high doses, 3D-CRT plans are much higher than VMAT: Dose to left lung V20Gy (36.22 ± 3.9% compared to 22.62 ± 2.43%), V30Gy (30.6 ± 5.97% compared to 11.77 ± 2.53%) and V40Gy (24.73 ± 8.59% compared to 3.63 ± 2.02%) (P <0.001).