Variable

Technique

p-value

3F-CRT

4F-CRT

SC-CTV max dose

•       Dose range

•       Mean ± SD

5301 - 5810 5518 ± 144

5130 - 5511 5333 ± 111

0.001

SC-CTV min dose

•       Dose range

•       Mean ± SD

2709 - 4558 3988 ± 504

3063 - 4926 4463 ± 401

0.01

SC-CTV mean dose

•       Dose range

•       Mean ± SD

4750 - 5190 4942 ± 109

4890 - 5270 5051 ± 89

0.023

SC-CTV D_98%^*

•       Dose range

•       Mean ± SD

70% - 97% 84% ± 11%

90% - 99% 95% ± 4%

0.001

Ipsilateral lung %V_20Gy^**

•       Volume range

•       Mean ± SD

12% - 28% 20% ± 3.8%

12% - 30% 21% ± 4.3%

0.9

Carotid max dose

•    Dose range

•    Mean ± SD

5230 - 5661 5454 ± 131

4874 - 5285 5159 ± 112

0.014

Carotid mean dose

•    Dose range

•    Mean ± SD

4356 - 5467 5026 ± 818

4613 - 5121 4966 ± 128

0.3