. Author manuscript; available in PMC: 2013 Jan 1.

Published in final edited form as: Int J Radiat Oncol Biol Phys. 2010 Nov 13;82(1):435–441.e1. doi: 10.1016/j.ijrobp.2010.09.033

Table 2.

Differences Between CT Only and PET/CT

Variable	CT only	PET/CT	Difference (PET/CT – CT only)	p-value^†
GTV Primary Volume (cm³)				<0.0001^‡
Mean (standard deviation)	98.7 (102.5)	86.2 (88.1)	−12.5 (61.5)
Median (Range)	66.1 (2.3–441.7)	59.9 (0.7–471.2)	−4.4 (−215.3–112.9)
Number of Included Nodes				0.41
Mean (standard deviation)	2.1 (2.1)	2.4 (2.3)	0.2 (2.0)
Median (Range)	2 (0–10)	2 (0–12)	0 (−6–10)
Mean Lung Dose				0.06
Mean (standard deviation)	19.0 (8.0)	17.8 (7.2)	−1.2 (4.0)
Median (Range)	19.0 (7.2–49.0)	16.3 (6.3–43.6)	−0.4 (−13.1–6.4)
V20				0.21
Mean (standard deviation)	32.0 (13.8)	30.8 (14.4)	−1.1 (6.2)
Median (Range)	31 (10–80)	27 (9–74)	−1 (−13–13)
Mean Esophageal Dose				0.30
Mean (standard deviation)	28.7 (12.6)	27.1 (10.8)	−1.4 (9.4)
Median (Range)	26.8 (0.9–57.5)	25.1 (8.9–57.1)	−1.8 (−25.3–21.3)

^†

Wilcoxon Matched-Pairs Signed-Ranks test