Comprehensive Analysis of Set-Up Gain of 6-Dimensional Cone-Beam CT Correction Method in Radiotherapy for Head and Neck and Brain Tumors

Table 2

The statistics of set-up error measured from 358 actual patient data.

Axis	Translation (mm)				Rotation (°)
	AP^a	LR^b	SI^c	RMS^d	Yaw	Pitch	Roll	RMS^d
Max.^e	8.60	10.40	8.00	12.42	2.60	2.50	2.70	3.54
Mean	1.43	1.27	1.53	2.85	0.55	0.52	0.64	1.18
SD^f	1.19	1.25	1.42	1.70	0.52	0.49	0.60	0.68
Median	1.10	1.00	1.20	2.48	0.40	0.40	0.50	1.12
90%^g	3.60	3.44	4.22	6.07	1.20	1.20	1.24	2.03

^aAP: anterior-to-posterior; ^bLR: left-to-right; ^cSI: superior-to-inferior; ^dRMS: root-mean-square sum; ^eMax.: maximum; ^fSD: standard deviation; ^g90%: 90 percentile.