Table 2.

Systematic Σ and random σ setup error depending on surrogate used for matching the CBCT to the reference CT

		Σ (mm)	σ (mm)
Bones	vrt	1.92	1.87
	lng	1.72	1.69
	lat	0.61	0.90
Balloon	vrt	1.68	1.82
	lng	1.20	1.66
Soft tissue	vrt	0.77	1.09
	lng	0.36	0.17
		0.49	0.93

Fiducial marker matching in CBCT was taken as a reference.