Table 2.

Range of errors (%) and mean absolute errors (%) for clinically relevant metrics in the case of all plans (N) meeting a specified threshold Gamma passing rate for three sets of Gamma parameters

Anatomy dose metric		Observed errorsa (%) in DVH dose metrics for plans exceeding ≥95% passing rateb (3∕3 and 2∕2 criteria) and exceeding ≥90% passing rateb (1∕1 criteria)
		3%∕3 mm (N=83)	2%∕2 mm (N=51)	1%∕1 mm (N=12)
Spinal cord	Range of % Errors	[−11.1, 15.7]	[−11.1, 15.7]	[−2.7, 3.3]
D1cc	Mean absolute errorc (%)	3.222	3.367	2.309
Contralateral	Range of % errors	[−10.9, 12.0]	[−10.9, 12.0]	[−5.1, 5.7]
Parotid mean	Mean absolute errorc (%)	4.50	5.52	4.04
Ipsilateral	Range of % errors	[−3.7, 4.1]	[−3.7, 4.1]	[−1.4, 1.7]
Parotid mean	Mean absolute errorc (%)	1.49	2.06	1.45
Larynx mean	Range of % errors	[−15.9, 9.2]	[−7.6, 9.2]	[−3.2, 3.7]
	Mean absolute errorc (%)	5.66	5.32	2.50
CTV D95	Range of % errors	[−3.7, 2.6]	[−2.2, 2.6]	[−1.6, 1.6]
	Mean absolute errorc (%)	1.26	1.66	1.30

^aError ranges and the mean absolute errors are given as percent errors (%) using the error-free plans as the baseline.

^bAnalysis criteria method: Global % difference (normalized to max dose), 10% lower threshold, and γ index≤1 as the passing criterion.

^cThe average of error magnitudes, i.e., absolute values of errors (%).