Table 2.

Slope of the best‐fit line between %GP of various gamma criteria and MLC errors

Slope of the best‐fit line
Treatment	QA device	Method	Case	Acceptance criteria
				3%/3 mm	3%/2 mm	3%/1 mm	2%/2 mm
IMRT	EPID	Absolute gamma analysis	1	−5.15	−7.84	−12.10	−8.80
			2	−4.69	−7.15	−11.16	−8.80
			3	−4.63	−7.07	−11.12	−8.03
			4	−4.25	−6.72	−10.61	−7.77
			5	−2.60	−4.52	−8.99	−6.74
VMAT	EPID	Absolute gamma analysis	1	−2.14	−3.44	−5.44	−3.69
			2	−1.70	−2.64	−3.81	−2.54
			3	−2.07	−3.44	−5.61	−3.67
			4	−1.75	−2.81	−4.79	−3.05
			5	−1.91	−3.13	−5.42	−3.22
VMAT	EPID	Relative gamma analysis	1	−0.01	−0.14	−1.64	−0.42
			2	−0.01	−0.09	−0.73	−0.20
			3	−0.05	−0.19	−1.85	−0.42
			4	−0.07	−0.19	−1.46	−0.36
			5	−0.02	−0.11	−1.03	−0.17
IMRT	MapCheck2	Absolute gamma analysis	1	−1.34	−2.83	−6.36	−5.52
			2	−0.30	−0.77	−2.10	−1.68
			3	−0.73	−1.71	−4.70	−3.28
			4	−0.53	−1.41	−1.30	−3.08
			5	0.01	−0.06	−1.06	−0.57
VMAT	ArcCheck	Absolute gamma analysis	1	−3.78	−5.33	−6.33	−4.87
			2	−0.28	−0.55	−1.08	−1.28
			3	−3.64	−5.57	−6.60	−5.92
			4	−0.64	−1.17	−2.04	−2.96
			5	−1.06	−2.21	−3.18	−3.38