Target volumes 3D-CRT (dorsal decubitus) 3D-CRT (lateral isocentric decubitus) HT Left breast 95.7% 78.0% 102.6% Tumor bed 95.0% 91.7% 96.2% 3D-CRT: three-dimensional conformal radiotherapy; HT: Helical tomotherapy

Table 1: Delivered relative doses to 95% of the planning target volume.