Table 4.

Responses to survey questions: planar secondary questions for passing criteria for gamma analysis.

		Gamma distance‐to‐agreement
		2 mm	3 mm	4 mm	5 mm
Gamma dose percent difference	1%	0.1% (1)*	0.1% (1)	0.0% (0)	0.0% (0)
	2%	5.1% (58)*	0.1% (1)	0.0% (0)	0.0% (0)
	3%	4.0% (46)*	84.3% (963)	0.1% (1)	0.1% (1)
	4%	0.1% (1)	0.1% (1)	0.7% (8)	0.0% (0)
	5%	0.2% (2)	1.0% (12)	0.0% (0)	1.9% (22)

The gamma distance‐to‐agreement ranged from 2 to 5 mm while the gamma dose percent difference ranged from 1 to 5%. Percentage based on number of sites that provided answers for the criteria (N = 1143). *Acceptable criteria based on recommendations for TG‐218