An IMRT/VMAT Technique for Nonsmall Cell Lung Cancer
Table 3
The data for OARs sparing for IMRT, VMAT, and Hybrid IMRT/VMAT plans.
IMRT
VMAT
Hybrid
IMRT versus VMAT
IMRT versus Hybrid
VMAT versus Hybrid
Mean ± SD
Mean ± SD
Mean ± SD
value
value
value
Normal lung
(Gy)
67.5 ± 2.7
67.9 ± 3.7
67.7 ± 3.2
>0.05
>0.05
>0.05
(%)
18.7 ± 4.1
18.4 ± 4.2
17.7 ± 3.9
>0.05
<0.05
<0.05
(%)
25.4 ± 4.9
25.2 ± 6.1
25.5 ± 5.6
>0.05
>0.05
>0.05
(%)
35.2 ± 6.9
41.7 ± 8.0
38.5 ± 7.3
<0.05
<0.05
<0.05
(%)
50.0 ± 8.2
60.3 ± 11.2
57.2 ± 10.7
<0.05
<0.05
<0.05
Mean (Gy)
14.2 ± 2.2
15.2 ± 2.6
14.6 ± 2.3
<0.05
<0.05
<0.05
Spinal cord
(Gy)
41.5 ± 10.0
35.7 ± 10.5
35.9 ± 9.0
<0.05
<0.05
>0.05
Esophagus
(Gy)
67.0 ± 5.7
66.2 ± 6.9
63.7 ± 7.9
>0.05
<0.05
<0.05
Mean (Gy)
22.9 ± 9.9
23.0 ± 9.6
22.4 ± 9.7
>0.05
<0.05
<0.05
Heart
(Gy)
34.0 ± 25.7
31.3 ± 24.0
31.6 ± 23.8
>0.05
<0.05
>0.05
Mean (Gy)
8.5 ± 8.8
7.4 ± 7.1
7.8 ± 7.8
<0.05
<0.05
>0.05
(%)
1.1 ± 2.0
0.9 ± 1.6
0.8 ± 1.5
<0.05
<0.05
>0.05
(%)
4.5 ± 5.6
2.8 ± 4.0
3.2 ± 4.4
<0.05
<0.05
>0.05
PTV is planning target volume, IMRT is intensity modulated radiation therapy, VMAT is volumetric modulated arc therapy, CN is conformation number, and HI is homogeneity index. is percentage volume of OARs receiving at least Gy of radiation dose.
