Table 4.

Correlation between the %GP of various gamma criteria and the %DE for the DVH metrics

Pearson's correlation coefficient ®
Treatment	QA devices	Methods	Acceptance criteria	Brainstem, D2%		Spine, D2%		R parotid, DMean		L parotid, DMean		PTV 70, DMean
				r	P	r	P	r	P	r	P	r	P
IMRT	EPID	Absolute gamma analysis	3%/3 mm	−0.80	<0.001	−0.80	<0.001	−0.80	<0.001	−0.77	<0.001	−0.84	<0.001
			3%/2 mm	−0.85	<0.001	−0.85	<0.001	−0.85	<0.001	−0.82	<0.001	−0.88	<0.001
			3%/1 mm	−0.89	<0.001	−0.91	<0.001	−0.92	<0.001	−0.89	<0.001	−0.92	<0.001
			2%/2 mm	−0.82	<0.001	−0.86	<0.001	−0.85	<0.001	−0.80	<0.001	−0.85	<0.001
VMAT	EPID	Absolute gamma analysis	3%/3 mm	−0.75	<0.001	−0.77	<0.001	−0.74	<0.001	−0.77	<0.001	−0.75	<0.001
			3%/2 mm	−0.74	<0.001	−0.81	<0.001	−0.71	<0.001	−0.75	<0.001	−0.73	<0.001
			3%/1 mm	−0.75	<0.001	−0.87	<0.001	−0.71	<0.001	−0.78	<0.001	−0.76	<0.001
			2%/2 mm	−0.63	<0.001	−0.75	<0.001	−0.62	<0.001	−0.63	<0.001	−0.61	<0.001
VMAT	EPID	Relative gamma analysis	3%/3 mm	−0.25	0.077	−0.06	0.66	−0.19	0.19	−0.24	0.09	−0.21	0.13
			3%/2 mm	−0.41	<0.05	−0.23	0.10	−0.33	<0.05	−0.43	<0.05	−0.40	<0.05
			3%/1 mm	−0.68	<0.001	−0.57	<0.001	−0.51	<0.001	−0.68	<0.001	−0.62	<0.001
			2%/2 mm	−0.50	<0.001	−0.26	0.07	−0.41	<0.001	−0.50	<0.001	−0.46	<0.001
IMRT	MapCheck2	Absolute gamma analysis	3%/3 mm	−0.41	<0.001	−0.35	<0.001	−0.39	<0.001	−0.40	<0.001	−0.44	<0.001
			3%/2 mm	−0.50	<0.001	−0.42	<0.001	−0.46	<0.001	−0.47	<0.001	−0.52	<0.001
			3%/1 mm	−0.58	<0.001	−0.48	<0.001	−0.52	<0.001	−0.52	<0.001	−0.58	<0.001
			2%/2 mm	−0.64	<0.001	−0.56	<0.001	−0.61	<0.001	−0.62	<0.001	−0.67	<0.001
VMAT	ArcCheck	Absolute gamma analysis	3%/3 mm	−0.69	0.077	−0.42	<0.05	−0.61	<0.001	−0.58	<0.001	−0.66	<0.001
			3%/2 mm	−0.69	<0.05	−0.44	<0.05	−0.61	<0.001	−0.59	<0.001	−0.67	<0.001
			3%/1 mm	−0.63	<0.001	−0.43	<0.05	−0.57	<0.001	−0.55	<0.001	−0.63	<0.001
			2%/2 mm	−0.74	<0.001	−0.51	<0.001	−0.64	<0.001	−0.61	<0.001	−0.69	<0.001