Table 5.

Mean of the normal brain mean dose for the ten cases planned using each combination of number of arcs, low dose constraint, jaw tracking, and collimator angle selection. The median difference with the combination having the smallest mean of the normal brain mean dose, the range of the differences, and the p-value for a one-sided Wilcoxon signed rank test are also shown.

Number of arcs	Low dose constraint	Jaw tracking	Collimator angle selected	Mean	Median difference	Range	p
4	+	+	+	3.23	0.00	-	-
2	+	+	+	3.29	0.03	-0.00 to 0.30	0.00
4	+	-	+	3.30	0.07	0.04 to 0.12	0.00
4	+	+	-	3.30	0.08	-0.08 to 0.20	0.01
2	+	-	+	3.35	0.11	-0.00 to 0.36	0.00
2	+	+	-	3.37	0.13	-0.07 to 0.28	0.00
4	+	-	-	3.40	0.18	0.05 to 0.28	0.00
2	+	-	-	3.48	0.26	0.07 to 0.34	0.00
2	-	+	+	3.72	0.39	0.05 to 1.49	0.00
4	-	+	+	3.78	0.43	0.12 to 1.54	0.00
2	-	-	+	3.80	0.48	0.11 to 1.49	0.00
4	-	-	+	3.85	0.53	0.17 to 1.61	0.00
2	-	+	-	3.93	0.57	0.18 to 1.41	0.00
4	-	+	-	3.95	0.63	0.22 to 1.66	0.00
2	-	-	-	4.05	0.71	0.33 to 1.48	0.00
4	-	-	-	4.09	0.83	0.34 to 1.63	0.00