Organs 3D-CRT (dorsal decubitus) 3D-CRT (lateral isocentric decubitus) HT Heart 8.1 4.5 9.0 Ipsilateral lung 19.6 8.6 12.7 Controlateral lung 0.8 0.2 5.9 3D-CRT: Three-dimensional conformal radiotherapy, HT: Helical tomotherapy

Table 3: Mean doses (Gy) delivered to organs at risk.