Table 2.

[Deviations from megavoltage computed tomography imaging for surface scanning and in‐room lasers] Systematic and random residual error based on the setup for in‐room lasers and surface scanning respectively, tabulated with simulated correction for systematic error based on the first three fractions for in‐room laser positioning (Laser NAL). Calculated from all treated setup vectors (N = 16 835). All values are presented in mm

Site	Axis	Systematic			Random
		Laser	Laser NAL	Surface	Laser	Surface
H&N	Lateral	1.3	0.7	0.4	2.0	0.7
	Longitudinal	1.6	1.6	0.8	2.4	1.2
	Vertical	2.6	1.3	0.4	2.6	2.1
CNS	Lateral	1.0	0.6	0.2	0.8	0.5
	Longitudinal	1.4	1.0	0.3	1.7	0.6
	Vertical	2.1	1.2	0.3	2.7	0.6
Thorax	Lateral	2.2	1.4	1.2	2.8	1.4
	Longitudinal	3.6	3.2	3.2	5.9	4.0
	Vertical	5.2	2.5	1.9	5.0	2.5
Abdomen	Lateral	2.3	1.9	1.6	2.6	1.1
	Longitudinal	3.5	2.9	3.1	5.6	3.3
	Vertical	5.0	3.5	2.9	5.7	2.5