Table 4.

A comparison of the parameters for treatment planning based on the three different CT images

Parameter	EI-EE		EI-3DCT		EE-3DCT
	z	P-value	z	P-value	z	P-value
Ipsilateral normal breast
Dmean	−1.326	0.185	−2.390	0.017	−2.354	0.019
V20	−0.635	0.526	−3.062	0.002	−2.277	0.023
V30	−1.008	0.313	−2.837	0.005	−2.837	0.005
Ipsilateral lungs
Dmean	−0.342	0.732	−2.499	0.014	−2.297	0.022
V5	−1.232	0.218	−3.211	0.001	−2.259	0.024
V10	−1.248	0.212	−3.285	0.001	−2.173	0.030
V20	−0.101	0.920	−1.993	0.046	−2.634	0.008
Heart
Dmean	−0.971	0.322	−2.547	0.011	−2.807	0.005
V5	−0.507	0.612	−2.521	0.012	−2.100	0.036
V10	−0.676	0.499	−2.366	0.018	−2.197	0.028

Notes: Data format is median (minimum – maximum) as calculated by SPSS 19.0 software. P-value was calculated by Wilcoxon-signed-ranks test.

Abbreviations: 3DCT, three-dimensional computed tomography; EI, end inhalation; EE, end exhalation; D_mean, mean dose (Gy); V₅, volume that received ≥5 Gy; V₁₀, volume that received ≥10 Gy; V₂₀, volume that received ≥20 Gy; V₃₀, volume that received ≥30 Gy.