Time (min)

Target area

Background area

p value

15

287.91 ± 37.19

262.96 ± 30.43

0.0020**

30

259.12 ± 31.75

247.55 ± 27.59

0.0017**

45

251.46 ± 25.26

243.42 ± 24.23

0.00097***

60

250.79 ± 27.82

242.47 ± 23.41

0.0033**

75

249.40 ± 24.95

241.46 ± 22.54

0.0025**

90

247.50 ± 24.75

241.23 ± 21.48

0.0051**

105

246.95 ± 22.46

240.61 ± 21.12

0.0062**

120

245.96 ± 22.37

241.03 ± 20.97

0.00053***