Table 6.

Institutional imaging QA threshold tolerances for MV/kV planar radiographic modes

Frequency	Quality Metric	Quality Check	Tolerance Level (Percent of Baseline)
			Warning	Action
Monthly	High contrast spatial resolution (1p/mm)	${\mathrm{f}}_{30}$	$>2\%$	$>4\%$
		${\mathrm{f}}_{40}$	$>2\%$	$>4\%$
		${\mathrm{f}}_{50}$	$>2\%$	$>4\%$
Annual	Imaging quality	Dose Energy	$>1\%$	$>2\%$
		Energy	$>1\%$	$>2\%$