Table 1.

Results of the dose measurements for two different field sizes: for both field sizes, there is a decrease in dose relative to ungated treatment when reducing the gating level and therefore increasing the number of start-up processes and delivery time

Gating level	Relative dose (10 x 10 cm 2 field)	Relative dose (20 x 20 cm 2 field)
50%	99.41 ± 0.07%	99.59 ± 0.05%
40%	99.43 ± 0.04%	99.53 ± 0.04%
30%	99.45 ± 0.52%	99.46 ± 0.04%
20%	98.81 ± 0.05%	99.09 ± 0.05%
10%	97.85 ± 0.04%	98.28 ± 0.05%