The comparison of DVHs for PTV and normal liver in 3DCRT, IMRT and RapidArc. Right figure = DVHs of PTV. These three techniques produced similar homogeneity of the PTV. Left figure = DVHs of normal liver. RapidArc obtained the higher low-dose distribution in the normal liver compared with 3DCRT and IMRT. On the other hand, 3DCRT obtained the high-dose distribution in the normal liver compared with IMRT and RapidArc.