Table 6.

Quality control tests for electronic portal imaging devices (tolerances and action levels are specified in millimeters unless otherwise stated)

Designator	Test	Performance
		Tolerance	Action
Daily
DE1	Mechanical integrity	Functional
DE2	Electrical integrity	Functional
DE3	Collision interlocks	Functional
DE4	Image quality	Reproducibility
Monthly
ME1	Positioning in the imaging plane	1	2
ME2	Positioning perpendicular to the imaging plane	10	20
ME3	Image quality	Reproducibility
ME4	Artifacts	Reproducibility
ME5	Spatial distortion	1	2
ME6	Monitor controls	Reproducibility
ME7	Records	Complete
Six monthly
SE1	Spatial resolution	Reproducibility
SE2	Noise	Reproducibility
SE3	On‐screen measurement tools	0.5	1
SE4	Setup verification tools	0.5 (0.5°)	1 (1°)
Annually
AE1	Independent quality control review	Complete