Table 3.

Effect of Spatial Offset Toward the X Direction on Plan Quality Metrics for 5 Target Sizes.

Target Size	X-Offset (mm)	D95 (Gy)	Difference (%)	Paddick’s CI	Difference (%)
5 mm	0.0	20.0	-	0.65	-
	0.5	19.8	−0.8	0.63	−2.4
	1.0	18.7	−6.7	0.53	−18.6
	1.5	18.5	−7.5	0.48	−26.3
	2.0	15.9	−20.6	0.26	−59.7
	2.5	15.6	−22.0	0.23	−65.1
	3.0	12.8	−36.1	0.10	−85.2
10 mm	0.0	20.0	-	0.77	-
	0.5	19.5	−2.7	0.74	−3.3
	1.0	19.1	−4.4	0.70	−8.5
	1.5	17.8	−10.9	0.60	−21.9
	2.0	17.3	−13.5	0.53	−31.2
	2.5	15.5	−22.4	0.44	−42.7
	3.0	14.9	−25.3	0.38	−51.1
20 mm	0.0	20.0	-	0.93	-
	0.5	19.7	−1.8	0.88	−4.7
	1.0	19.2	−3.8	0.84	−9.4
	1.5	18.4	−8.0	0.78	−15.4
	2.0	17.6	−11.8	0.73	−21.4
	2.5	16.7	−16.7	0.68	−26.6
	3.0	15.7	−21.3	0.63	−32.0
30 mm	0.0	20.0	-	0.93	-
	0.5	19.9	−0.5	0.92	−1.7
	1.0	19.7	−1.4	0.90	−3.8
	1.5	19.3	−3.5	0.86	−7.7
	2.0	18.7	−6.3	0.83	−11.2
	2.5	17.8	−11.1	0.79	−15.6
	3.0	17.3	−13.7	0.75	−19.0
50 mm	0.0	20.0	-	0.94	-
	0.5	19.9	−0.3	0.93	−1.0
	1.0	19.8	−0.9	0.91	−3.2
	1.5	19.6	−2.0	0.89	−5.5
	2.0	19.3	−3.4	0.87	−7.7
	2.5	19.0	−5.0	0.85	−10.3
	3.0	18.7	−6.7	0.83	−12.4

Abbreviation: CI, conformity index.