Table 4.

Confusion matrices when a 1% machine learning model threshold is used to predict a 3% IC threshold

All machines
n = 603		Ion chamber		Plans to QA
		Fail	Pass
Machine Learning model	Fail	41	257	49.4%
	Pass	0	305
Truebeam STx
n = 141		Ion chamber
		Fail	Pass
Machine Learning model	Fail	6	31	26.2%
	Pass	0	104
Truebeam
n = 462		Ion chamber
		Fail	Pass
Machine Learning model	Fail	35	226	56.5%
	Pass	0	201

Abbreviations: IC = ion chamber; QA = quality assurance.