Fig. 5
From: Characteristics of non-coplanar IMRT in the presence of target-embedded organs at risk
Range of nCOV for varying beam set orientation. Topology (B, C): The maximum (Max: white area) and minimum (Min: dark grey area) normalized composite objective value nCOV for varying beam set orientations vs. number of beams (# beams) in double logarithmic scale. (A) due to spherical symmetry all beam set orientations are equivalent (light grey). The plans (techniques a, b, c, d) were fluence optimized. The lines are for eye guiding only