Table 1.

Setup Errors and Registration Errors of MRsp (n=12: Mean ± Standard Deviation)

cm	Set-Up Error		Registration Error
	Cranial Marker	Caudal Marker	L3↑	L3↓	L4↓
x-axis	0.09 ± 0.06	0.08 ± 0.06	N/A	N/A	N/A
y-axis	0.30 ± 0.28	0.29 ± 0.18	0.29 ± 0.17	0.38 ± 0.25	0.42 ± 0.35
z-axis	0.22 ± 0.12	0.18 ± 0.10	0.11 ± 0.09	0.15 ± 0.13	0.13 ± 0.10

Notes: The x-axis corresponds to the left-right (LR) direction of the CT bed. The y-axis corresponds to the anterior-posterior (AP) direction of the CT bed. The z-axis corresponds to the superior-inferior (SI) direction of the CT bed.

Abbreviation: N/A, not available.