Table 4.

Changes of MTV and GTV pre-RT and during-RT after SBRT and 3DCRT

Parameter	Pre-RT Mean (95%CI of mean)			During RT Mean (95%CI of mean)			Volume Difference Mean (95%CI of mean)
	3DCRT	SBRT	p value	3DCRT	SBRT	p Value	3DCRT	SBRT	p value
PET-MTV (cc)	52.1 (35.3~68.9)	17.8 (4.5~31.0)	0.327	18.1 (9.8~26.5)	13.5 (1.4~25.6)	0.791	34 (22.1~45.8)	4.3 (−4.8~13.3)	0.230
Percentage of PET-MTV to pre-RT	100 (100~100)	100 (100~100)		27.1 (20.7~33.6)	84.6 (37.5~131.6)	<0.001	72.9 (66.4~79.3)	15.4 (−31.6~62.4)	<0.001
CT-GTV (cc)	88.0 (56.6~119.5)	18.8 (1.8~35.9)	0.296	44.9 (29.0~60.9)	17.5 (2.5~32.5)	0.414	43.1 (20.3~65.9)	1.4 (−5.3~8.0)	0.384
Percentage of CT-GTV to pre-RT	100 (100~100)	100 (100~100)		56.1 (48.3~63.9)	110.2 (61.3~159.1)	0.002	43.9 (36.1~51.7)	−10.2 (−59.1~38.7)	0.002
Difference of GTVs-MTVs (cc)	38.0 (15.0~61.0)	1.1 (−3.5~5.6)	0.439	27.8 (17.1~38.5)	4.0 (−2.9~10.8)	0.286	−10.2 (−30.0~9.6)	2.9 (0.3~5.5)	0.750
Difference of GTV and MTV (%)	32.5 (24.1~40.9)	−11.7 (−33.8~10.4)	0.014	68.1 (61.1~75.1)	16.7 (−5.4~38.7)	0.001	34.9 (25.1~44.8)	28.4 (1.9~54.9)	0.749