Table 2.

Wide field IEC symmetry as measured with EPID and IC Profiler for all four available photon beams

Beam	Plane	IC Profiler symmetry (%)	EPID symmetry (%)	% difference
6 MV	In‐plane	100.4	100.46	−0.06
	Cross‐plane	100.3	100.34	−0.04
10 MV	In‐plane	100.6	100.38	0.22
	Cross‐plane	100.5	100.38	0.12
6 MV FFF	In‐plane	100.4	100.23	0.17
	Cross‐plane	100.4	100.00	0.40
10 MV FFF	In‐plane	100.7	100.40	0.30
	Cross‐plane	100.4	100.00	0.30
		Mean difference		0.19 ± 0.18% (1 SD)