Table 1.

Dosimetric parameters of PTV coverage from clinically treated IMRT plans, virtual simulation IMRT plans, and virtual simulation VMAT plans. D 95: the minimal dose to 95% of the PTV, D5: minimal dose to 5% of the PTV, Dmean: mean dose to the PTV, CI: conformal index, the ratio between PTV and volume receiving dose larger than prescription dose, HI: homogeneity index, the difference between D5 and D95, divided by Dmean

	Clinically treated IMRT	Virtual simulation IMRT	Virtual simulation VMAT
D95 [cGy]	3168 ± 121	3151 ± 78	3195 ± 80
Dmean [cGy]	3781 ± 63	3709 ± 63	3749 ± 82
D5 [cGy]	4122 ± 124	4020 ± 96	4043 ± 118
V33 [%]	92.8 ± 2.0	91.9 ± 1.4	93.3 ± 1.3
CI[ratio]	1.08 ± 0.07	1.03 ± 0.08	1.06 ± 0.09
HI [ratio]	0.25 ± 0.06	0.23 ± 0.03	0.23 ± 0.03