Table 2.

Estimates of group systematic error (M), systematic error (∑), and random error (σ) with different CBCT imaging MUs, reconstruction slice thicknesses, and planning CT slice thicknesses in six head‐and‐neck patients.

			Setup Error (mm)
CBCT Imaging MUs a	CBCT Slice Thickness b (mm)	Planning CT Slice Thickness c (mm)	M	SI ∑	σ	M	LR ∑	σ	M	AP ∑	σ
5	1	1	$-0.1$	0.6	1.7	0.1	0.5	1.0	0.0	0.3	1.2
		3	$-0.6$	0.8	1.3	$-0.1$	0.7	1.0	$-0.3$	0.6	0.8
8	1	1	$-0.6$	1.2	1.4	0.2	0.5	0.9	$-0.2$	0.9	1.2
		3	$-0.6$	1.2	1.5	0.0	0.6	1.1	$-0.3$	0.6	0.9
5	3	1	$-0.1$	0.6	1.7	0.1	0.5	1.0	0.1	0.3	1.2
		3	$-0.5$	0.7	1.3	$-0.1$	0.7	1.0	$-0.2$	0.5	0.9
8	3	1	$-0.4$	0.8	1.3	0.3	0.5	1.0	0.1	0.9	1.2
		3	$-0.5$	1.1	1.4	0.0	0.5	1.0	$-0.3$	0.6	0.9

^aCompared with CBCT imaging MUs: ${\mathrm{F}}_{\text{SI}}=0.637$, $p=0.430$; ${\mathrm{F}}_{\text{LR}}=0.712$, $p=0.404$; ${\mathrm{F}}_{\text{AP}}=0.206$, $p=0.653$

^bCompared with CBCT slice thickness: ${\mathrm{F}}_{\text{SI}}=0.0$, $p=1.0$; ${\mathrm{F}}_{\text{LR}}=0.105$, $p=0.747$; ${\mathrm{F}}_{\text{AP}}=0.526$, $p=0.472$

^cCompared with planning CT slice thickness: ${\mathrm{F}}_{\text{SI}}=1.682$, $p=0.202$; ${\mathrm{F}}_{\text{LR}}=0.826$, $p=0.369$; ${\mathrm{F}}_{\text{AP}}=2.377$, $p=0.131$