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. Author manuscript; available in PMC: 2008 Oct 1.

Published in final edited form as: Int J Radiat Oncol Biol Phys. 2007 Oct 1;69(2):589–597. doi: 10.1016/j.ijrobp.2007.05.038

Table 2.

Statistical Analysis of Indices for Metastases and Whole Brain in Tomotherapy Plans as Functions of Field Width (FW) and Pitch.

	Mean and standard deviation				p value
	2.5 cm FW			1.0 cm FW	0.215 vs. 0.433	0.289_2.5 vs. 0.289_1.0
Index	0.215	0.289	0.433	0.289	0.215 vs. 0.433	0.289_2.5 vs. 0.289_1.0

Metastases
CN	0.55 ± 0.16	0.55 ± 0.16	0.55 ± 0.16	0.60 ± 0.13	NS	0.011
PITV	1.76 ± 0.61	1.75 ± 0.61	1.76 ± 0.60	1.48 ± 0.37	NS	0.038
TC	0.932 ± 0.038	0.936 ± 0.037	0.938 ± 0.033	0.925 ± 0.053	NS	NS
HI	0.116 ± 0.044	0.119 ± 0.045	0.120 ± 0.040	0.104 ± 0.041	NS	0.016
Whole Brain
HI	0.485 ± 0.152	0.472 ± 0.145	0.480 ± 0.145	0.322 ± 0.120	NS	< 0.001
TC	0.957 ± 0.007	0.957 ± 0.008	0.956 ± 0.008	0.959 ± 0.017	NS	NS

Abbreviations: 0.289_2.5 = 0.289 pitch with 2.5 cm FW; 0.289_1.0 = 0.289 pitch with 1.0 cm FW; NS = not significant.

The two-tailed p values were results from paired t-tests.