Table 8 SUV_max, SUV_peak, standard deviation of the background region and Contrast-to-noise ratio indexes measured on the 60 lesions selected by the physicians on PET100, PET50 and PET50 + SP series of our patients

SUV_max

Mean value

10.9

11.3

10.4

Standard deviation

4.9

5.3

5.3

Mean ΔSUV_max

–

2.9%

− 5.4%

Std dev of ΔSUV_max

–

9.2%

10.4%

SUV_peak

Mean value

8.1

8.2

8.0

Standard deviation

4.5

4.6

4.8

Mean ΔSUV_peak

–

1.2%

− 2.6%

Std dev of ΔSUV_peak

–

4.4%

5.8%

SD of the background region

Mean value

0.29

0.32

0.27

Standard deviation

0.14

0.15

0.14

Mean ΔSD

–

16.4%

− 8.4%

Std dev of ΔSD

–

15.8%

10.2%

CNR

Mean value

75.2

62.8

83.1

Standard deviation

121.3

86.3

127.0

Mean ΔCNR

–

− 9.5%

3.3%

Std dev of ΔCNR

–

13.6%

14.4%