Evaluating the effect of different photon beams on intensity modulated radiation therapy for liver cancer

We aimed to evaluate dosimetrically the effect of 6 MV, 10 MV and dual 6 and 10 MV photon beam energies on the liver of most cancers using steep and shoot IMRT methods, and we investigate a few important parameters, including dose, conformity index (CI) and homogeneity index (HI). The beams were arranged based on different angles. The same optimization constraints were applied for each energy planning and all other parameters, such as number of beams and beam angles, were kept constant. The dose-volume histograms (DVHs) for the 6 MV, 10 MV and dual energy plans were compared for the planning target volume (PTV) and organs at risk (OAR). Twenty-eight cases (n = 28) of liver SBRT patients formerly handled the use of steep and shoot IMRT techniques. Three plans with identical beam geometries were created using 6 MV, 10 MV and dual energy. In the central axis, the powerful intensity from each beam was calculated, and the values were averaged.