Table 2.

Statistical analysis results for MV films and surface imaging (SI) data using the DICOM reference surface (${\text{DICOM}}_{\text{ref}}$) for preshifts and postshifts surfaces along the anterior‐posterior (AP), craniocaudal (CC), and left‐right (LR) directions

	Preshifts (mm)			Postshifts (mm)
	AP	CC	LR	AP	CC	LR
SI ‐ Entire Surface
Group mean	0.9	3.8	2.2	0.6	1.9	0.3
Systematic error	3.3	3.0	4.0	2.2	2.4	3.1
Random error	2.6	3.4	3.0	1.8	2.6	2.7
LOA: upper bound	9.0	14.1	7.9	6.2	9.3	7.9
LOA: lower bound	$‐3.9$	$‐7.0$	$‐7.6$	$‐3.6$	$‐4.3$	$‐6.9$
LOA range	12.8	21.1	15.5	9.8	13.6	14.8
Setup margin	10.2	9.8	12.0	‐	‐	‐
r	0.49	0.14	0.66	‐	‐	‐
SI ‐ Breast Surface
Group mean	0.3	1.2	3.4	$‐0.7$	$‐1.3$	1.7
Systematic error	3.1	2.5	3.0	2.8	3.2	3.1
Random error	2.3	2.9	4.8	2.1	3.0	2.8
LOA: upper bound	8.3	11.2	8.8	6.4	8.3	9.9
LOA: lower bound	$‐4.3$	$‐10.7$	$‐6.3$	$‐6.6$	$‐10.1$	$‐6.1$
LOA range	12.6	21.9	15.1	13.0	18.4	15.9
Setup margin	9.2	8.3	10.9	‐	‐	‐
r	0.47	$‐0.07$	0.69	‐	‐	‐
MV Films
Group mean	$‐1.0$	$‐0.1$	2.7	‐	‐	‐
Systematic error	1.5	4.8	3.8	‐	‐	‐
Random error	2.5	1.8	3.5	‐	‐	‐
Setup margin	5.4	13.4	12.1	‐	‐	‐