Table 2.

Mean residual planning isocenter setup errors and their effect on target volume geometric and dosimetric deviations

Parameter	Mean distance from isocenter	X (lateral)	y (vertical)	z (longitudinal)	3D vector	Pitch (x)	Yaw (y)	Roll (z)	Mean nonoverlapping GTV %	Mean nonoverlapping PTV %	Mean V95 variation %	Mean D95 variation %
Mean	34.7	–0.09	0.15	–0.18	0.34	–0.13	–0.08	0.2	12.6∗	6.1†	1.34‡	1.5§
SD	17.1	0.18	0.2	0.23	0.30	0.12	0.16	0.18	19	10	2.3	2.6
Range	0.22-76.3	–0.31 to 0.28	–0.36 to 0.37	–0.36 to 0.44	0.1-0.53	–0.22 to 0.28	–0.33 to 0.32	–0.35 to 0.42	0-58	0-44	0-9.2	0-24.5

Abbreviations: 3D = 3-dimensional; GTV = gross tumor volume; PTV = planning target volume; SD = standard deviation.

^∗>10% in 84 lesions.

^†>10% in 48 lesions.

^‡>5% in 22 PTVs.

^§>5% in 25 PTVs.