Table 2.

The $P_{\text{ion}}$ results of the flattened and FFF beams, where diff (%) = (FFF‐Flat)/Flat.

	$P_{\mathit{\text{ion}}}$
	Farmer Chamber		PinPoint Chamber		Plane‐parallel Chamber
SAD (cm)	100	150	100	150	100	150
6X Flat	1.004	1.000	1.000	1.000	1.018	1.015
6X FFF	1.008	1.003	1.006	1.000	1.014	1.012
Diff (%)	0.4%	0.3%	0.6%	0	‐0.4%	‐0.3%
10X Flat	1.012	1.000	1.005	1.000	1.011	1.008
10X FFF	1.015	1.008	1.005	1.000	1.019	1.014
Diff (%)	0.3%	0.8%	0	0	0.8%	0.6%