Table 2.

Dosimetric parameters of OAR constraint from clinically treated IMRT plans, virtual simulation IMRT plans, and virtual simulation VMAT plans. V15 [cc]: volume of the structure receiving dose greater than 15 Gy in unit of cc, V20 [cc]: volume of the structure receiving dose greater than 20 Gy in unit of cc, V12 [%]: percentage volume of the structure receiving dose greater than 12 Gy.

	Clinically Treated IMRT	Virtual Simulation IMRT	Virtual Simulation VMAT
Duodenum-V15 [cc]	5.66 ± 2.00	6.01 ± 2.17	5.24 ± 2.13
Duodenum-V20 [cc]	1.19 ± 0.77	1.19 ± 0.69	1.17 ± 0.62
Stomach-V15 [cc]	6.00 ± 2.54	6.12 ± 2.94	4.92 ± 2.45
Stomach-V20 [cc]	1.02 ± 0.64	0.98 ± 0.65	0.96 ± 0.79
Bowel-V15 [cc]	6.09 ± 2.05	5.78 ± 2.00	4.64 ± 1.99
Bowel-V20 [cc]	1.27 ± 0.99	1.03 ± 0.98	1.44 ± 0.82
Liver-V12 [%]	6.18 ± 5.01	7.02 ± 6.91	6.96 ± 7.06
Kidney-V12 [%]	6.36 ± 6.65	7.08 ± 7.07	7.83 ± 7.55
Stomach-V12 [%]	7.51 ± 4.26	7.01 ± 3.67	5.67 ± 3.30