Table 1.

Numerical results of the comparison in 5D for the head neck case I around the seven-beam solution in figure 11 with parameters C = 50 and M = 32. Each face of the grid simplex is affiliated with one criterion: the criterion improves with decreasing distance to the face (see figure 5 and explanation). The negative value for the objective function difference indicates that the chosen seven-beam configuration stays superior if the spinal cord objective is further improved. If target coverage should be significantly improved however, a switch to the nine-beam configuration is indicated.

		Center of faces
	Grid center	Target	Mandible	Left parotid	Right parotid	Spinal cord
Δ objective	−7.9	10.0	0.03	3.5	−1.7	−13.2
Dominates?	+	−	0	−	+	+