fig3

Figure 3. Dose-volume histogram showing dose to target (GTV and PTV) relative to normal liver (Liver-GTV). Doses to other critical tissues are simultaneously assessed but not displayed in the current figure. The plans are normalized to similar Liver-GTV mean doses. due to dose-limits to normal liver, the 3-field and 3D Conformal plans are limited to 20 Gy in 5 fractions, IMRT allows 30 Gy in 5 fractions, and SBRT 35 Gy in 5 fractions with even higher dose in the center of the target. IMRT: Intensity-modulated radiotherapy; SBRT: stereotactic body radiation therapy; GTV: gross tumor volume; ITV: internal target volume; PTV: planning tumor volume.