TABLE I.

Gantry-to-couch and gantry-to-phantom measurement statistics.

		|Machine-CAD|		Machine-CAD
	No. of measurements	Mean	Max	Normality	w1	μ1	σ1	μ2	σ2
Couch to gantry
Head	62	0.24	0.72	Yes		−0.004	0.29
Lung	61	0.17	0.61	No	0.66	−0.11	0.05	−0.12	0.001
Prostate	62	0.15	0.95	No	0.86	−0.08	0.01	−0.19	0.27
All	185	0.18	0.95	No	0.59	−0.11	0.01	−0.02	0.12
Phantom to gantry
Head	38	0.88	2.95	Yes		0.68	0.94
Lung	39	0.80	2.19	Yes		0.23	0.99
Prostate	38	1.45	2.97	No	0.86	1.48	0.65	−0.32	2.09
All	115	1.04	2.97	Yes		0.71	1.10