Table 1.

Description of treatment parameters

Plan parameters	Frequency
Energy
6 MV	50 (68%)
6 + 16 MVa	24 (32%)
Number of beams
8	3 (4%)
9	15 (20%)
10	49 (66%)
11	7 (10%)
Number of non-coplanar beams
≤2	2 (3%)
4	18 (24%)
5	46 (62%)
6	8 (11%)

^a6 + 16 MV = treatment fields including both 6 MV and 16 MV beams.